SC-AK521 - Hi-Fi System PANASONIC - Free user manual and instructions
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| Type of Product | Hi-Fi System |
| Brand | Panasonic |
| Model | SC-AK521 |
| Dimensions (W x H x D) | 200 mm x 300 mm x 400 mm (approx.) |
| Weight | 6 kg (approx.) |
| Power Supply | AC 120 V, 60 Hz (or AC 220-240 V, 50/60 Hz depending on region) |
| Power Consumption | 60 W (approx.) |
| Amplifier Output (PMPO) | 300 W |
| Disc Player | CD Player (supports CD, CD-R/RW) |
| Cassette Deck | Double cassette deck (record/playback) |
| Radio Tuner | FM/AM with preset stations |
| Equalizer | Preset sound modes (Rock, Pop, etc.) |
| Speaker Configuration | 2-way bass reflex speakers (detachable) |
| Remote Control | Included (infrared) |
| Display | Fluorescent dot matrix display |
| Audio Inputs | AUX input (RCA) |
| Headphone Jack | 3.5 mm stereo |
| Cleaning Instructions | Use a soft dry cloth; avoid solvents |
| Safety Warnings | Do not expose to moisture or extreme temperatures; unplug during storms |
| Repair and Spare Parts | Contact authorized Panasonic service center |
| Additional Functions | Sleep timer, clock, auto power off |
| Warranty | Standard manufacturer warranty applies |
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USER MANUAL SC-AK521 PANASONIC
natural_image
Four-panel illustration of a multi-camera electronic device with front, side, top, and back views (no visible text or symbols)CD Stereo System
Operating Instructions
Model No. SC-AK521

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Abstract black-and-white illustration of musical instruments and a vase with musical notes (no text or symbols)
Before connecting, operating or adjusting this product, please read these instructions completely.
Please keep this manual for future reference.

: For areas using power supply of 120 V.

: For areas using power supply of 110/127/220-230/240 V.
Dear customer
Thank you for purchasing this product.
For optimum performance and safety, please read these instructions carefully.
These operating instructions are applicable to the following systems. Unless otherwise indicated, illustrations in these operating instructions are of SC-AK521: [GCP].
| System SC-AK521 | |
| Main unit SA-AK521 | |
| Front speakers SB-AK520 | |
| Subwoofer SB-WAK520 | |
GCP only

| CAUTION | - INVISIBLE LASER RADIGATION WHEN OPEN, AVOID EXPOSURE TO BEAM. RIGR05-1 Class 3a |
| VARNING | - OSYNLIG LASERSTRAILING NAR DENNA DEL AR ÖPPNAD, BETRAKTA ER STRALEN. |
| ADVARSEL | - USYNLIG LASERSTRAILING VED ÄRNING, LINDA LOSSETTELE FOR STRALING. |
| ADVARSEL | - USYNLIG LASERSTRAILING NAR DEKSEL. ÄPINES, LINDA EKSPOURING FOR STRALEN. |
| VARO! | - AWATESA SILET NAKYMÄTÖNTÄ ALTIMA LASARETELYLE, ALABATTO SAISEZEN. |
| VORSICHT | - UNSICHTARE LASERSTRAILUNG, WENN ABDECKUNG GEGET, NAD TASTRAHL ASSETZEN. |
| ATTENTION | - RAYONNEMENT LASER INVISIBLE EN CAS DUVERTURE, EXPOSITION DANGERTUSE AU PARISCAUL. |
| 注意 | - 五好时有不可见激光射线,避免激光实测时. |
| 注意 | - ここを聞くと不可刮レーザー光が出来. ピームを纯り、離れたりない下さい。 ROJKS005R |
Inside of product
Table of contents
IMPORTANT SAFETY INSTRUCTIONS.... 3
Supplied accessories 4
Placement of speakers 4
The remote control .... 4
Disc information 5
Set-up 6
Front panel controls 7
CDs 8
How discs with MP3 differ from CDs 9
CD Play Mode function for MP3 9
Album skip play 10
Track skip play 10
INTRO function (Album scan) 10
Program play for MP3 10
Starting play from a desired track in a desired album .... 11
Title search function 11
CD display for MP3 12
Marking a track 12
Radio 13
Cassettes.... 14
Sound quality/sound field 15
KARAOKE 15
Other functions 16
Optional antenna connections 16
External unit connections 16
Using an external unit 17
Using headphones (not included) 17
Turning the demo function on/off 17
Convenient functions 17
Auto-off function 17
Setting the time 17
Timers.... 18
Troubleshooting guide 19
Maintenance 19
Specifications 20
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
DO NOT OPEN COVERS AND DO NOT REPAIR YOURSELF. REFER SERVICING TO QUALIFIED PERSONNEL.
CAUTION!
- DO NOT INSTALL OR PLACE THIS UNIT IN A BOOKCASE, BUILT-IN CABINET OR IN ANOTHER CONFINED SPACE. ENSURE THE UNIT IS WELL VENTILATED. TO PREVENT RISK OF ELECTRIC SHOCK OR FIRE HAZARD DUE TO OVERHEATING, ENSURE THAT CURTAINS AND ANY OTHER MATERIALS DO NOT OBSTRUCT THE VENTILATION VENTS.
- DO NOT OBSTRUCT THE UNIT'S VENTILATION OPENINGS WITH NEWSPAPERS, TABLECLOTHS, CURTAINS, AND SIMILAR ITEMS.
• DO NOT PLACE SOURCES OF NAKED FLAMES, SUCH AS LIGHTED CANDLES, ON THE UNIT.
• DISPOSE OF BATTERIES IN AN ENVIRONMENTALLY FRIENDLY MANNER.
WARNING:
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK OR PRODUCT DAMAGE, DO NOT EXPOSE THIS APPARATUS TO RAIN, MOISTURE, DRIPPING OR SPLASHING AND THAT NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHALL BE PLACED ON THE APPARATUS.
This product may receive radio interference caused by mobile telephones during use. If such interference is apparent, please increase separation between the product and the mobile telephone.
The socket outlet shall be installed near the equipment and easily accessible or the mains plug or an appliance coupler shall remain readily operable.
GCP only
THIS UNIT IS INTENDED FOR USE IN TROPICAL CLIMATES.
CAUTION:
Change the voltage setting to suit the AC voltage in your area. See page 6.
Note that the unit will be seriously damaged or fail to operate correctly if this setting is not made correctly.
IMPORTANT SAFETY INSTRUCTIONS
Read these operating instructions carefully before using the unit. Follow the safety instructions on the unit and the applicable safety instructions listed below. Keep these operating instructions handy for future reference.
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9) PL only
Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart'apparatus combination to avoid injury from tip-over.

13) Unplug this apparatus during lightning storms or when unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
Supplied accessories
Please check and identify the supplied accessories.

☐ AC power supply cord .... 1 pc.




☐ FM indoor antenna..... 1 pc. ☐ AM loop antenna..... 1 pc.


□ Batteries for remote control .. 2 pcs. □ GCP only Power plug

adaptor 1 pc.

☐ Remote control transmitter .... 1 pc. (N2QAHB000039)

Placement of speakers
Place the front speakers so that the super tweeter is on the outside.

flowchart
graph TD
A["Super tweeter"] --> B["Front speaker (left)"]
C["Super tweeter"] --> D["Main unit"]
E["Subwoofer"] --> F["Place on the floor or a sturdy shelf so that it won't cause vibration. (SB-WAK520)"]
B --> D
D --> F
F --> G["Front speaker (right)"]
Note
- Keep your speakers at least 10 mm away from the system for proper ventilation.
• These speakers do not have magnetic shielding. Do not place them near televisions, personal computers or other devices easily influenced by magnetism. - You cannot take the front net off the speakers.
The remote control
Batteries

- Insert so the poles (+ and -) match those in the remote control.
- Do not use rechargeable type batteries.
Do not:
- mix old and new batteries.
- use different types at the same time.
- heat or expose to flame.
• take apart or short-circuit. - attempt to recharge alkaline or manganese batteries.
- use batteries if the covering has been peeled off.
- keep together with metallic objects such as necklaces.
Mishandling of batteries can cause electrolyte leakage which can damage items the fluid contacts and may cause a fire. If electrolyte leaks from the batteries, consult your dealer.
Wash thoroughly with water if electrolyte comes in contact with any part of your body.
Remove if the remote control is not going to be used for a long period of time. Store in a cool, dark place.
Replace if the unit does not respond to the remote control even when held close to the front panel.
Use

Aim at the sensor, avoiding obstacles, at a maximum range of 7 meters directly in front of the unit.
- Keep the transmission window and the unit's sensor free from dust.
- Operation can be affected by strong light sources, such as direct sunlight, and the glass doors on cabinets.
Do not:
- put heavy objects on the remote control.
• take the remote control apart.
• spill liquids onto the remote control.
CD selection
Choose CDs with this mark:

Do not:
- use irregularly shaped CDs.
- attach extra labels and stickers.
- use CDs with labels and stickers that are coming off or with adhesive exuding from under labels and stickers.
- attach scratch proof covers or any other kind of accessory.
• write anything on the CD.
- clean CDs with liquids. (Wipe with a soft, dry cloth.)
- use CDs printed with label printers available on the market.




To prevent damage
Always observe the following points:
- Load only 1 CD on the tray.


- Load CDs as shown in the figure.
An adaptor is not needed with 8 cm CDs (singles).
8 cm CD


12 cm CD


- Set the system on a flat, level surface.
• Always unload all CDs before moving the unit.
Do not:
- set the unit on top of magazines, inclined surfaces, etc.
- move the unit while a tray is opening/closing, or when loaded.
- put anything except a CD in the tray.
- use cleaning CDs or CDs which are badly warped or cracked.
- disconnect the AC power supply cord from the household AC outlet during disc changing operation.
This unit can play MP3 and CD-DA (digital audio) format audio CD-R and CD-RW that have been finalized (a process that enables CD-R/CD-RW players to play audio CD-R and CD-RW) upon completion of recording.
It may not be able to play some CD-R or CD-RW due to the condition of the recording.
MP3 information
This unit can play MP3 files recorded on CD-R/RW with a computer. Files are treated as tracks and folders are treated as albums. This unit can access up to 999 tracks, 255 albums and 20 sessions.
When making MP3 files to play on this unit
Disc format
Discs must conform to ISO9660 level 1 or 2 (except for extended formats).
File format
MP3 files must have the extension ".MP3" or ".mp3".
To play in a certain order
Prefix the folder and file names with 3-digit numbers in the order you want to play them.
Files may not be recorded in numbered order if the prefixes have different numbers of digits. For example: 1????.mp3, 2????.mp3, 10????.mp3.
However, some writing software may also cause recording to occur in a different order.

flowchart
graph TD
root --> 001
001 --> 001.mp3
001 --> 002.mp3
001 --> 003.mp3
002 --> 002.mp3
002 --> 003.mp3
003 --> 003.mp3
003 --> 004.mp3
003 --> 001.mp3
003 --> 002.mp3
003 --> 003.mp3
MPEG Layer-3 audio decoding technology licensed from Fraunhofer IIS and Thomson multimedia.
Limitations on MP3 play
- This unit is not compatible with packet-write format.
- When both MP3 and CD-DA data is recorded on the disc over a number of sessions:
- If the first session contains MP3 recordings, the unit will play from the MP3 made in that session till the session before the first CD-DA recordings.
- If the first session contains CD-DA recordings, the unit will play only the recordings made in that session. The subsequent sessions will be ignored.
- Some MP3 may not be played due to the condition of the disc or recording.
- Recordings will not necessarily be played in the order you recorded them.
Set-up
Connect the AC power supply cord only after all other connections have been made.
Preparation
Twist and pull off the vinyl tip of the antenna wires and speaker cords.


flowchart
graph TD
A["4 GCP only Voltage selector\nUse a flat-head screwdriver to turn the voltage selector on the rear panel to the appropriate position for the area in which this system is used. If the power supply in your area is 115 V or 120 V, please set the voltage selector as follows:\n• For 115 V: Set to 110 V.\n• For 120 V: Set to 127 V."]
B["VOLT ADJ\n127V↔110V↔220-230V↔240V"] --> C["2 AM loop antenna\nStand the antenna up on its base."]
C --> D["1 FM indoor antenna\nAdhesive tape\nAffix where reception is best."]
D --> E["To household AC outlet"]
5 AC power supply cord
Insertion of connector
Even when the connector is perfectly inserted, depending on the type of inlet used, the front part of the connector may jut out as shown in the drawing.
However there is no problem using the unit.
Appliance inlet

Approx. 6 mm
GCP only
If the power plug does not fit your socket, use the power plug adaptor (included).

Note
The included AC power supply cord is for use with this unit only. Do not use it with other equipment.
For your reference
Information you enter into the unit's memory, except for time, remains intact for up to a week after the AC power supply cord is disconnected.
3 Speaker cords

Use only the supplied speakers.
The combination of the main unit and speakers provide the best sound. Using other speakers can damage the unit and sound quality will be negatively affected.

Caution
- Use the speakers only with the recommended system. Failure to do so may lead to damage to the amplifier and/or the speakers, and may result in the risk of fire. Consult a qualified service person if damage has occurred or if you experience a sudden change in performance.
- Do not attach these speakers to walls or ceilings.
Main unit


① AC supply indicator [AC IN]
This indicator lights when the unit is connected to the AC mains supply.
② PL
Standby/on switch [∅/I, POWER]
Press to switch the unit from on to standby mode or vice versa. In standby mode, the unit is still consuming a small amount of power. GCP
Standby/on switch [∅/I]
Press to switch the unit from on to standby mode or vice versa. In standby mode, the unit is still consuming a small amount of power.
③Display
④ Microphone jack [MIC] 15
⑤ Deck 1 cassette holder .... 14
⑥Disc tray
⑦ CD tray open/close button [▲, OPEN/CLOSE] 8
⑧ CD direct play buttons [1 \~ 5] 8
⑨ Remote control signal sensor 4
⑩ Headphones jack [PHONES] 17
⑪ Deck 2 cassette holder .... 14
Center console
⑫ Subwoofer button [SUBWOOFER].... 15
⑬ Super sound EQ button [SUPER SOUND EQ] 15
⑭CD skip/search, tape fast-forward/rewind, tune/preset channel select, time adjust buttons [I◄◄/REW/V, ►►I/FF/∧].... 8-11, 13, 14, 17
⑮ Tuner/band select button [TUNER, BAND].... 13
⑯ CD play/pause button [▶/II, CD] 8
⑰ Enter button [ENTER] 10, 11
⑱ Joystick....10, 11
⑲ Microphone volume control [MIC VOL] 15
⑳ Preset EQ select button [PRESET EQ]....15
②1 Deck 1 open button [▲, DECK 1].... 14
②2 Display, demonstration button [DISP, -DEMO] 17
②3 Record button [●, REC]....14
⑳ AUX button [AUX] 17
②5 Volume control [VOLUME DOWN, UP] 15
②6 Tape play/direction button [◀▶, TAPE] 14
27 Deck select button [DECK 1/2]....14
⑳ Stop/program clear button [■, STOP] 8-11, 14
⑲ Deck 2 open button [▲, DECK 2].... 14
③0 Delete button [DELETE] 9, 10, 12
③1 Title search mode select button [TITLE SEARCH]....11
③2 Marker memory/recall button [MARKER, -MEMORY, -RECALL] 12
Remote control

Buttons such as ② function in exactly the same way as the buttons on the main unit.
③3 Sleep timer + Auto off button [SLEEP, AUTO OFF] .....17, 18
③4 Disc button [DISC] 8
③5 Program button [PROGRAM] 9, 10, 13
③6 Play mode select button [PLAY MODE]....8, 9, 13, 14 Use this for selecting CD play mode, tune mode, FM mode, AM beat proof, tape reverse mode and deck select.
③7 Repeat button [REPEAT] 8
③8 Album skip buttons [←, →, ALBUM] 9
⑲ Intro button [INTRO] 10
④0Shift button [SHIFT]
To use functions labeled in orange ※ While pressing [SHIFT], press the corresponding button. ※ For buttons [AUTO OFF], [CLOCK/TIMER], [◎PLAY/REC], [S.WOOFER] and [KARAOKE]
④1 Super sound EQ + Subwoofer button [S.SOUND EQ, S.WOOFER] 15
④2 Dimmer + Play timer/record timer button [DIMMER, ⊕PLAY/REC] 17, 18
④3CD display + Clock/timer button [CD DISP, CLOCK/TIMER] 8, 12, 17, 18
44 Numbered, character buttons [≥10, 1–9, 0, A-Z, SPACE!"#] 8-13
④5 CD skip/search, tape fast-forward/rewind, tune/preset channel select, time adjust, cursor buttons [◀◀, REW/V, ← CURSOR, ▶▶I, ∧/FF, CURSOR →] ... 8-14, 17
④6 Muting button [MUTING] 17
④7 Preset EQ select + karaoke button [PRESET EQ, KARAOKE] .. 15

Basic play
1 Press [▲, OPEN/CLOSE] to open the tray.
The unit comes on.
2 Set a CD in the tray. (Label must face upward.)
To continue loading CDs in the other trays
Press [1]–[5] to select the required tray and press [▲, OPEN/CLOSE] to open the tray.
Press [▲, OPEN/CLOSE] to close the tray.
3 Press [1]–[5] to play your desired disc.

(Alternatively, you can press [▶/■, CD] if the current disc is your desired CD.)
The track number and its elapsed playing time are shown.
Use the CD Play Mode function's ALL-DISC mode to play CDs in succession. (→ see right)
To stop the disc play
Press [■, STOP].
The total number of tracks and total playing time are shown.
One touch play
During standby mode and when a CD is loaded, press [▶II, CD] or [1] – [5].
The unit comes on and play starts.
| To pause | Press [▶/II, CD] during play. Press again to resume play. |
| To search forward/backward | Hold down [I◀◀/REW/V] (backward) or [▶▶I/FF/∧] (forward) during play or pause. |
| To skip forward/backward | Press [I◀◀/REW/V] (backward) or [▶▶I/FF/∧] (forward) during play or pause. |
Note
- During 1-RANDOM or A-RANDOM play ( see below), you cannot skip to tracks already played.
- During program play (→ page 9), 1-RANDOM or A-RANDOM play, you can search only within the track.
- You cannot use search function for MP3 files.
- Always stop the changer before loading or changing CDs. You cannot change CDs while a disc is playing.
CD display
You can display the remaining play time of the current track.
Press [CD DISP] on the remote control during play or pause.
Every time you press the button:
Elapsed play time Remaining play time
Note
When track number 25 or greater is playing, remaining play time display shows “- -:-”.
Repeat play
Remote control only
Press [REPEAT] during play.
“○” is displayed.
To cancel repeat play
Press [REPEAT] to clear "○".
To listen to specific CDs and tracks (CD Play Mode function)
Remote control only
Preparation: Press [▶/■, CD] and then [■, CLEAR].
1 Press [PLAY MODE] to select the desired mode.
Every time you press the button:

ALL-DISC: Plays all loaded discs in succession from the selected disc to the final disc ✗
1-SONG: Plays one selected track on the selected disc.
1-RANDOM: Plays one selected disc in random order.
A-RANDOM: Plays all loaded discs in random order.
1-DISC: Plays one selected disc.
(The original display is restored in about 2 seconds.)
Proceed to step 4 when you selected A-RANDOM in step 1.
2 Press [DISC] and (within 10 seconds) [1]–[5] to select the disc.
The CD starts.
3 Only when you selected "1-SONG" in step 1
Select the track with the numbered buttons.
To select a track 10 or over, press [≥10] then the two digits.
Play starts from the selected track.
4 Only when you selected "A-RANDOM" in step 1
Press [▶/II, CD] to start play.
To stop play
Press [■, CLEAR].
When playback ends
The current play mode will be retained in memory until it is changed even if the unit is turned off.
※ Final disc
For example, if play starts from disc 4, disc 3 will be the "final disc".
Order of progression: Disc 4→5→1→2→3
Note
- You can use repeat mode with CD Play Mode function.
- You cannot use program mode together with CD Play Mode function.
Starting play from a specific track
Remote control only
1 Press [DISC] and (within 10 seconds) [1]–[5] to select the disc.
2 Select the track with the numbered buttons.
To select track 10 or over, press [≥10] then the two digits.
Play starts from the selected track.
Note
You cannot use this function with 1-RANDOM or A-RANDOM mode.
Program play
You can program up to 24 tracks.
Remote control only
Preparation: Press [▶/■, CD] and then [■, CLEAR].
1 Press [PROGRAM]. "PGM" appears.
2 Press [DISC] and (within 10 seconds) [1]–[5] to select the disc.
3 Select the tracks with the numbered buttons.
To select track 10 or over, press [≥10] then the two digits.
Repeat steps 2 and 3 to program other tracks.
4 Press [▶/II, CD] to start play.
To exit program mode
Press [PROGRAM] in the stop mode. (You can replay your program by pressing [PROGRAM] then ▶/II, CD).)
You can do the following while "P" is displayed

• To check program contents
Press [◀◀, REW/V] or [▶▶I, ∧/FF].
Every time you press the button, the track number and program order are displayed.

• To add to the program
Do steps 2 and 3.
• To clear the last track Press [DEL].
• To clear all tracks
Press [■, CLEAR].
While "CLEAR ALL" is blinking, press the button again to clear all tracks.
Note
- You can use repeat mode with program play.
- You cannot program CD-DA together with MP3 tracks.
To mark a track
See page 12.
How discs with MP3 differ from CDs
CD Play Mode function for MP3
Remote control only
Preparation: Press [▶/II, CD] and then [■, CLEAR].
1 Press [PLAY MODE] to select the desired mode.
Every time you press the button:
ALL-DISC: Plays all loaded discs in succession from the selected disc to the final disc *
1-SONG: Plays one selected track on the selected disc.
1-ALBUM: Plays one selected album on the selected disc.
1-DISC: Plays one selected disc.
(The original display is restored in about 2 seconds.)
2 Press [DISC] and (within 10 seconds) [1]–[5] to select the disc.
The CD starts.
3 When you selected "1-ALBUM" or "1-SONG" in step 1 Press [ALBUM (∠ or ▲)] to select the album.
Play starts from the first track of the selected album.
4 When you selected "1-SONG" in step 1 Press the numbered buttons to select the track in the current album.
To select track 10 or over, press [≥10] once then the two digits. To select track 100 or over, press [≥10] twice then the three digits. Play starts from the selected track.
To stop play
Press [■, CLEAR].
■ Display when in the stop mode (example)
File format indicator
"MP3": Indicates the disc contains MP3 files

When playback ends
The current play mode will be retained in memory until it is changed even if the unit is turned off.
※ Final disc
For example, if play starts from disc 4, disc 3 will be the "final disc".
Order of progression: Disc 4→5→1→2→3
■ When "NOT MP3/ERROR1" appears on the display
An unsupported MP3 format is being played. The unit will skip that track and play the next one.
Note
- You can use repeat mode (→ page 8) with CD Play Mode function.
- You cannot use program mode together with CD Play Mode function.

Album skip play
During play or stop
Push the joystick up/down ([ALBUM_ /CHARA] or [ALBUM_ /CHARA]) to select the desired album.
Remote control: Press [ALBUM ( or )].
When selecting in the stop mode:

Press [▶/II, CD] to start play.
Play starts from the first track of the selected album.
To play from another track, refer to "Track skip play" below.
Track skip play
During play or stop
Push the joystick left/right ([I◄◄, CURSOR] or [►►I, CURSOR]) to select a desired track. (You can also press [◄◄/REW/V] or [►►I/FF/∧].)
Remote control: Press [◀◀, REW/V] or [▶▶I, ∧/FF].
When selecting in the stop mode:

Press [▶/II, CD] to start play.
Play starts from the selected track.
To play from another album, refer to "Album skip play" above.
Note
During 1-ALBUM mode, track skipping can only be done within the current album.
INTRO function (Album scan)
You can find an album by listening to the first track of all albums in the current disc for 10 seconds each.
Remote control only
Preparation: Press [▶/■, CD] and then [■, CLEAR].
1 Press [INTRO].
INTRO function starts.
(INTRO function is cancelled after playing the first track in the last album on the current disc.)
2 While your desired album is playing, press [▶/II, CD].
Play continues from the first track of the album.
To stop during the process, press [INTRO] or [■, CLEAR].
Program play for MP3
You can program up to 24 tracks.
Remote control only
Preparation:
- Press [DISC] and (within 10 seconds) [1]–[5] to select the disc.
- Press [■, CLEAR].
1 Press [PROGRAM].
"PGM" appears.
2 Press [ALBUM (∠ or ▲)] to select the album.
To select an album directly, press the numbered buttons after pressing [ALBUM (or)]
To select album 10 or over, press [≥10] once then the two digits. To select album 100 or over, press [≥10] twice then the three digits.
3 Press [I◄◄, REW/∨] or [►►I, ∧/FF] to select the track. To select a track directly, press the numbered buttons after pressing [I◄◄, REW/∨] or [►►I, ∧/FF].
To select track 10 or over, press [≥10] once then the two digits. To select track 100 or over, press [≥10] twice then the three digits.
4 Press [ENTER].
Repeat steps 2\~4 to program other tracks.
5 Press [▶/II, CD] to start play.
To exit program mode
Press [PROGRAM] in the stop mode. (You can replay your program by pressing [PROGRAM] then ▶/II, CD).)
You can do the following while "P" is displayed

• To check program contents
Press [◀◀, REW/V] or [▶▶I, ∧/FF].
Every time you press the button, album number, track number and program order are displayed.
• To add to the program
Do steps 2\~4.
• To clear the last track Press [DEL].
• To clear all tracks
Press [■, CLEAR].
While "CLEAR ALL" is blinking, press the button again to clear all tracks.
Note
- You can use repeat mode (→ page 8) with program play.
- You cannot program more than one CD for MP3.
- You cannot program CD-DA together with MP3 tracks.
- The program memory is cleared when you change a disc or open the CD tray.
Starting play from a desired track in a desired album
Remote control only
Preparation: Press [▶/■, CD] and then [■, CLEAR].
1 Press [ALBUM ( or )] and then the numbered buttons to select the album.
To select album 10 or over, press [≥10] once then the two digits. To select album 100 or over, press [≥10] twice then the three digits.
Play starts from the first track of the selected album.
2 Press the numbered buttons to select the track in the current album.
To select track 10 or over, press [≥10] once then the two digits.
To select track 100 or over, press [≥ 10] twice then the three digits.
Play starts from the selected track.
Title search function
You can search for your desired album/track with its keyword (part of the title).
Album title search
Preparation: Press [▶/■, CD] and then [■, STOP].
1 Press [TITLE SEARCH] once.
2 Enter the characters of the keyword for the album title. (→ see right: "Entering characters")
3 Press [ENTER].
Album title search starts.
Blinks to indicate album title search mode

To show the next/previous album title search result
Push the joystick right ([▶▶I, CURSOR]) (next) or left ([▶◀◀, CURSOR]) (previous). (You can also press [◀◀/REW/V] or [▶▶I/FF/∧].)
Remote control: Press [▶▶▶, ∧/FF] (next) or [◀◀◀, REW/V] (previous).
Press [▶/II, CD] to start play from the album found.
Play starts from the first track of the album.
(Title search mode is cancelled.)
To cancel partway through
Press [■, STOP].
When there is no match for the searched keyword, the display shows "NOT FOUND".
Note
You cannot use title search function in program mode.
Track title search
Preparation: Press [▶/■, CD] and then [■, STOP].
1 Press [TITLE SEARCH] twice.
2 Enter the characters of the keyword for the track title. (→ see below: "Entering characters")
3 Press [ENTER].
Track title search starts.
Blinks to indicate track title search mode

Matched track title
To show the next/previous track title search result
Push the joystick right ([▶▶I, CURSOR]) (next) or left ([I◀◀, CURSOR]) (previous). (You can also press [I◀◀/REW/V] or [▶▶I/FF/∧].)
Remote control: Press [▶▶I, ∧/FF] (next) or [I◀◀, REW/V] (previous).
Press [▶/II, CD] to start play from the track found.
(Title search mode is cancelled.)
To cancel partway through
Press [■, STOP].
When there is no match for the searched keyword, the display shows "NOT FOUND".
Note
You cannot use title search function in program mode.
Entering characters
You can enter keyword of up to 8 characters for album/track title search. You can only enter upper case letters but the unit also searches for lower case.
On the main unit
① Push the joystick up/down ([ALBUM CHARA] or [ALBUM CHARA]) to select the required character.
Each time you push the joystick up ([ALBUM CHARA]), the characters change in the following order.
ABCDEFGHIJKLMNOPQRSTUVWXYZ 1234567890
space! " # \$ % & ' ( ) * + , - . / : ; <= > ? _
The sequence is reversed if you push the joystick down ([ALBUM CHARA]).
If you hold the joystick up/down ([ALBUM CHARA] or [ALBUM CHARA]), the characters change faster.
②Push the joystick right ([▶▶▶, CURSOR]) to enter the character.
Repeat steps ①\~② to complete the keyword.


Title search function
Entering characters
On the remote control
①Press the numbered button to select the required character. Characters allocated to the numbered buttons:
| Numbered buttons | Characters Nu buttons | umbered Characters | |
| 1 1 6 M | N O 6 | ||
| 2 A B C | 2 7 P Q R S 7 | ||
| 3 D E F | 3 8 T U V 8 | ||
| 4 G H I | 4 9 W X Y Z 9 | ||
| 5 J K L | 5 | 0 0 | |
| ≥slant 10 | space !"#$ %&'()*+,-./;;<=>?_` | ||
The characters change each time a numbered button is pressed. For example, every time you press [2]:
$$ \begin{array}{c}\text {A} \rightarrow \text {B} \rightarrow \text {C} \rightarrow 2\\uparrow\end{array} $$
② Press [CURSOR ▶] to enter the character.
Repeat steps ①\~② to complete the keyword.
■ Editing keywords
To move the cursor
Push the joystick left/right ([◀◀, CURSOR] or [▶▶I, CURSOR]).
Remote control: Press [CURSOR (or)]
Deleting a character
- Move the cursor over the character to be deleted.
- Press [DELETE] (remote control: Press [DEL].)
Editing a character
- Move the cursor over the character to be edited.
- Enter the correct character.
CD display for MP3
During play or pause
Press [CD DISP] on the remote control to select a desired CD display mode.
Every time you press the button:

Example:

Note
- When a title is longer than 8 characters, it will scroll across the display. If you selected a mode from ⓑ - ⓕ (see above), the scrolling will start again after every 3 seconds.
- "NO ID3" is displayed if titles with ID3 tags haven't been entered.
• Maximum number of displayable characters:
Album/track title: 31
ID3 album/title/artist name: 30
(ID3 is a tag embedded in MP3 track to provide information about the track.) - This unit can display album and track titles with ID3 tags (version 1.0 and 1.1). Titles containing text data that the unit doesn't support cannot be displayed.
- Titles entered with 2-byte code cannot be displayed correctly on this unit.
Marking a track
You can mark one track each on the discs loaded so that you can start play from them later.
To mark a track number
1 During play or stop
Select your desired track.
(For MP3, refer to "Track skip play" on page 10.
For CD-DA, press the numbered buttons on the remote control.
To select track 10 or over, press [≥10] then the two digits.)
2 Hold down [MARKER, -MEMORY] until "STORING" blinks on the display.
Remote control: Hold down [MARKER].
The selected track is stored in the marker of the current disc.
Note
If a track is already stored in the marker, it will be replaced next time you store a new track in the same marker.
To recall a marked track number in the current disc
During play or stop
Press [MARKER, -RECALL] to recall a marker.
Remote control: Press [MARKER].
Play starts from the track recalled.
Note
- "NO MARKER" indicates that the marker in the current disc is empty.
- The marker memory is cleared when you open the CD tray.
- For CD-DA, you cannot use this function during 1-RANDOM play and A-RANDOM play.
- You cannot use this function during program mode.
Manual tuning Preset tuning
1 Press [TUNER, BAND] to select band.
The unit comes on.
Every time you press the button:
FM AM
2 Press [PLAY MODE] on the remote control to select "MANUAL".
Every time you press the button:
MANUAL PRESET
3 Hold down [I◄◄/REW/V] or [►►I/FF/∧] for a moment to search for a station.
The frequency stops when it finds a clear station.
To stop during the process, press [I◄◄/REW/V] or [►►I/FF/∧].
Under excessive interference, a station may not be found.
Press [I◄◄/REW/V] or [►►I/FF/∧] repeatedly to tune step-by-step.
"TUNED" is displayed when a radio station is tuned.
“ST” is displayed when a stereo FM broadcast is being received.
If noise is excessive in FM
Remote control only
Hold down [PLAY MODE] to display "MONO".
Monaural sound is selected and noise reduces when reception is weak.
Hold down [PLAY MODE] again to cancel the mode.
"MONO" is also cancelled if the frequency is changed.
Allocation setting
Main unit only

: By adjusting the allocation, you can enable this tuner to receive FM broadcasts allocated in 0.1MHz steps.

By adjusting the allocation, you can enable this tuner to receive AM broadcasts allocated in 10 kHz steps.
Hold down [TUNER, BAND]. The display changes in a few seconds to show the current minimum frequency. Continue to hold down the button until the minimum frequency changes. The step is changed.
Repeat the above to change the step back.
Note
- After changing the "allocation" setting, the frequencies you previously preset in the memory will be cleared.
- Sound is momentarily interrupted if you load/unload tapes while listening to an AM broadcast.
Remote control only
There are two methods of pre-setting stations.
Automatic presetting : All the stations the tuner can receive are preset.
Manual presetting : You can select the stations to preset and the order they are preset in.
Up to 15 stations each can be set in the FM and AM bands.
Preparation:
Press [TUNER, BAND] to select "FM" or "AM".
Automatic presetting
Do the following once each for FM and AM.
Preparation: Tune to the frequency where pre-setting is to begin.
Hold down [PROGRAM] until the frequency changes.
The tuner presets all the stations it can receive into the channels in ascending order. When finished, the last station memorized is tuned in.
![PANASONIC SC-AK521 - Hold down [PROGRAM] until the frequency changes. - 1](/content/2026/05/992041/images/9e07f96b2a2fe7bd5340b144db3656273203b099637ba7117718a10d58e7fa30.jpg)
Manual presetting
Pre-set the stations one at a time.
① Press [PROGRAM] then press [I◄◄, REW/V] or [►►I, ∧/FF] to tune to the desired station.
② Press [PROGRAM] then press [I◄◄, REW/V] or [►►I, ∧/FF] to select a channel.
③Press [PROGRAM].
The station occupying a channel is erased if another station is preset in that channel.
Selecting channels
Press the numbered buttons to select the channel.
To enter channel 10 or over, press [≥10], then the two digits.

OR
① Press [PLAY MODE] to select "PRESET".
② Press [I◄◄, REW/∨] or [►►I, ∧/FF] to select the channel.

Playback
You can use either deck 1 or deck 2 for tape playback.
Use normal position tapes.
High position and metal position tapes can be played, but the unit will not be able to do full justice to the characteristics of these tapes.
1 Press [◀▶, TAPE].
The unit comes on.
If a cassette was loaded, play starts automatically (One touch play).
2 Press [▲, DECK 1] or [▲, DECK 2] and insert the cassette.
Insert with the side to be played facing towards you and the exposed tape facing down. Close the holder by hand.

Front side
3 Press and hold [PLAY MODE] on the remote control to select the reverse mode.
Every time you press and hold the button:

: One side is played. : Both sides are play
: Both sides are played repeatedly until [■, STOP] is pressed.
To listen to 2 tapes consecutively
Load a tape into each deck and select "C. Both tapes will be played repeatedly until [■, STOP] is pressed.
4 Press [◀▶, TAPE] to start playback.
Every time you press the button: ◀ R ← F ▶
F▶: The forward side (front side) will play.
◀ R : The reverse side will play.
To stop tape playback
Press [■, STOP].
To fast-forward or rewind
Press [◀◀/REW/V] (rewind) or [▶▶I/FF/∧] (fast-forward).
To select between loaded decks
Press [DECK 1/2] (remote control: [PLAY MODE]).
Note
- Tape playback is momentarily interrupted if you open the other deck.
- Tapes exceeding 100 minutes are thin and can break or get caught in the mechanism.
- Tape slack can get caught up in the mechanism and should be taken up before the tape is played.
- Endless tapes can get caught up in the deck's moving parts if used incorrectly. Use tapes appropriate to this unit's auto-reverse mechanism.
Recording
Selection of tapes for recording
Use normal position tapes.
High position and metal position tapes can be used, but this unit will not be able to record or erase them correctly.
Preparation:
Wind up the leader tape so recording can begin immediately.
Press [◀▶, TAPE] then [■, STOP] to select tape as the source.
1 Press [▲, DECK 2] and insert the cassette to be recorded.
The tape direction is automatically set to "F ►".
To record on the reverse side
Press [◀▶, TAPE] twice, then press [■, STOP]
2 Press and hold [PLAY MODE] on the remote control to select the reverse mode.
Every time you press and hold the button:

→ : One side only records.
→, (→) : Both sides record (forward → reverse).
“ ” automatically changes to “ ” when [●, REC] is pressed.
3 Select the source to be recorded.
Radio recording:
Tune in the station. ( page 13)
CD recording:
①Insert the CD(s) you want to record.
Press [▶/■, CD] and then [■, STOP].
②Prepare the desired CD recording mode.
Remote control only
- To record programmed tracks (→ do steps 1–3 on page 9 for CD-DA or steps 1–4 on page 10 for MP3).
• To record specific CDs/tracks
-
For CD-DA, do steps 1 to 2 on page 8: "To listen to specific CDs and tracks (CD Play Mode function)". For MP3, do steps 1 to 2 on page 9: "CD Play Mode function for MP3". Ensure CD is stopped.
-
(MP3 only) For 1-ALBUM mode and 1-SONG mode: Press [ALBUM (or)] to select the album.
-
For 1-SONG mode: Press [I◄◄, REW/V] or [►►I, ∧/FF] to select the track.
Tape-to-tape recording:
① Press [◀▶, TAPE] and then [■, STOP].
② Press [▲, DECK 1] and insert the cassette you want to record.
4 Press [●, REC] to start recording.
To stop recording
Press [■, STOP].
If the tape finishes before the CD
The CD continues playing. Press [■, STOP] to stop it.
Reducing noise when recording AM
Remote control only
Hold down [PLAY MODE] while recording.
Every time you hold down the button: BP1 ↔ BP2
Choose the setting with the least noise.
Note
- Changes to volume and sound/field quality do not affect recording.
- You cannot open deck 1 while recording.
- You cannot fast-forward or rewind one deck while recording with the other.
- When recording an AM broadcast, sound is momentarily interrupted when you start and stop the recording.
(Continued on next page)
Cassettes
Recording
Erasure prevention
Use a screwdriver or similar object to break out the tab.

To re-record on a protected cassette
Cover the hole with adhesive tape.

Adhesive tape
To erase a tape
- Disconnect the microphone.
- Press [◀▶, TAPE] and then [■, STOP].
- Insert the recorded tape into deck 2.
Ensure there is no tape in deck 1. - Press and hold [PLAY MODE] on the remote control to select reverse mode.
- Press [●, REC].
Sound quality/sound field
Using the built-in sound quality/sound field settings
Press [PRESET EQ] to select a setting.
Every time you press the button:
![PANASONIC SC-AK521 - Press [PRESET EQ] to select a setting. - 1](/content/2026/05/992041/images/19fc596935c7a8e9780196c55132befeb2d02ccce99cd262723d24ce942a2b04.jpg)
flowchart
graph TD
A["HEAVY SOFT CLEAR"] --> B["DISCO LIVE HALL"]
B --> C["EQ-OFF (cancelled)"]
HEAVY (sound quality) : Adds punch to rock
SOFT (sound quality) : For background music
CLEAR (sound quality): Clarifies higher sounds
DISCO (sound field) : Produces sound with the same kind of lengthy reverberations heard at a disco
LIVE (sound field) : Makes vocals more alive
HALL (sound field) : Adds an expansiveness to the sound to produce the atmosphere of a great concert hall
Note
You cannot use PRESET EQ and SUPER SOUND EQ together.
Enhancing the sound quality
You can enhance the bass and treble effect of the sound.
Press [SUPER SOUND EQ].
Remote control: Press [S.SOUND EQ].
The button light comes on.
Press the button again to cancel.
The button light goes out.
Adjusting the bass
Press [SUBWOOFER].
Remote control: Press [SHIFT] + [S.WOOFER].
The button light comes on.
Each time you press the button:
MID (medium) → MAX (high) → Light off (off)
![PANASONIC SC-AK521 - Press [SUBWOOFER]. - 1](/content/2026/05/992041/images/45acd76f9bbdcc88e90d8fc159ebfa1ac7a777ec8b35a2ddeb15450df298cca9.jpg)
To cancel
Press [SUBWOOFER] to turn the light off.
Remote control: Press [SHIFT] + [S.WOOFER].
Note
You cannot use this function when headphones are connected.
KARAOKE
Enjoying karaoke
This system lets you enjoy KARAOKE with audio CDs and audio tapes.
1 First, lower volume with [MIC VOL], then connect the microphone (not included).
Plug type: 3.5 mm monaural
2 Press [SHIFT] + [KARAOKE] on the remote control to select the voice mode.
Every time you press the button:
V.MUTE MONO L MONOR

Voice mode selection
If you want to play with the KARAOKE function, check first whether or not your software is formatted for KARAOKE and then select the voice mode as indicated below.
○: Appropriate
●: For practice, etc.
| Voice modes\Software | KARAOKE | Non-KARAOKE | |
| Sound multiplex | Stereo | ||
| (OFF) | ●(Background music+Voice) | ○ | ●(For singing along) |
| V.MUTE | - | - | ○ |
| MONO L | ○(Background music) | - | - |
| MONO R | ●(Voice) | - | - |
Note
A bar is indicated in the above table when the voice mode is least effective. It is better to avoid using the mode in such cases.
V.MUTE function:
The voice portion of the track is blocked out but not the background music.
You need software recorded in stereo sound if you want to use the voice mute function. Voice and/or static may be reproduced with the following types of software.
- Software recorded monaural
- Classical music, or works performed by a limited number of instruments
- Chorus works or duets
3 Start the source (CD, etc.).
4 Adjust volume with [VOLUME] and [MIC VOL] and sing along.
To cancel the Karaoke
Press [SHIFT] + [KARAOKE] on the remote control to select "(OFF)" mode.
Note
- If strange noise (squealing or howling) is emitted during use, move the microphone further away from the speakers, or turn down the microphone volume.
- When you are not using the microphone, disconnect it from the MIC jack, and turn down the microphone volume level to MIN.
- Sound quality can be adjusted when using KARAOKE but recording will not be affected.
(Continued on next page)
KARAOKE

Enjoying karaoke
To record your "KARAOKE" performance
Preparations:
- Do steps 1 and 2 on page 14: "Recording".
- Do steps 1 and 2 on page 15: "Enjoying karaoke".
- When singing along with CDs
Insert the desired discs ( page 8). - When singing along with tape
Insert the desired tape into deck 1. (→ page 14).
Press [●, REC] and start karaoke performance.
To stop recording
Press [■, STOP].
Note
- To playback the recorded tape, be sure to press [SHIFT] + [KARAOKE] on the remote control to select the “(OFF)” mode.
- You cannot play or record KARAOKE with radio backing.
To record your voice
Preparation: Do steps 1 and 2 on page 14: "Recording". Ensure there is no tape in deck 1.
- First, lower volume with [MIC VOL], then connect the microphone.
- Press [●, REC] to start recording.
- Speak through the microphone and adjust volume with [VOLUME] and [MIC VOL].
Other functions
Optional antenna connections
Use outdoor antenna if radio reception is poor.
FM outdoor antenna

- Disconnect the FM indoor antenna.
- The antenna should be installed by a competent technician.
AM outdoor antenna

Run a piece of vinyl wire horizontally across a window or other convenient location.
Leave the loop antenna connected.
Note
Disconnect the outdoor antenna when the unit is not in use. Do not use the outdoor antenna during an electrical storm.
External unit connections

- An analog player with a built-in phono equalizer can be connected.
- For details, refer to the instruction manual of the units which are to be connected.
- When units other than those described above are to be connected, please consult your audio dealer.
Using an external unit
(See page 16 for external unit connection.)
- Press [AUX].
The unit comes on.
- For listening: Proceed to step 3.
For recording: Press [●, REC] (recording starts).
- Start playback from the external source. (For details, refer to the external unit's instruction manual.)
Using headphones (not included)
Reduce the volume level and connect the headphones.
Plug type: 3.5mm stereo
Note
Avoid listening for prolonged periods of time to prevent hearing damage.
Turning the demo function on/off
When the unit is first plugged in, a demonstration of its functions may be shown on the display.
If the demo setting is off, you can show a demonstration by selecting "DEMO ON".
Press and hold [DISP, -DEMO].
The display changes each time the button is held down.
NO DEMO (off) ← DEMO ON (on)
While in the standby mode, select "NO DEMO" to reduce power consumption.
Note
DEMO function cannot be turned on when Dimmer is on.
Convenient functions
To dim the display panel
Remote control only
Press [DIMMER].
The display is dimmed and the indicators are turned off.
(The AC supply indicator remains on.)
Press [DIMMER] again to restore the display.
Switching displays
Press [DISP, -DEMO] to select the desired display mode.
Every time you press the button:
![PANASONIC SC-AK521 - Press [DISP, -DEMO] to select the desired display mode. - 1](/content/2026/05/992041/images/499872f68f5c0af2be3845fcfd0bce99fb144d37894b987acbd1836f988a3706.jpg)
To mute the volume
Remote control only
Press [MUTING].
Press the button again to cancel.
"MUTING" goes out.
To cancel from the unit, turn [VOLUME] to minimum (--dB), then raise it to the required level.
Muting is also cancelled when the unit is turned off.
Auto-off function
Remote control only
When CD or tape is selected as the source
To save power, the unit turns off if it is left unused for ten minutes.
This function does not work if the source is tuner or AUX.
Press [SHIFT] + [AUTO OFF].
"AUTO OFF" is shown on the display.
The setting is maintained even if the unit is turned off.
If you select tuner or AUX as the source, "AUTO OFF" goes out. It comes on again when you select CD or tape.
To cancel
Press [SHIFT] + [AUTO OFF] again.
Setting the time
Remote control only

: This is a 12-hour clock.

: This is a 24-hour clock.
1 Switch on the power.
2 Press [SHIFT] + [CLOCK/TIMER] to select "CLOCK".
Every time you press the button:
CLOCK RE©PLAY → Ⓞ
![PANASONIC SC-AK521 - Press [SHIFT] + [CLOCK/TIMER] to select "CLOCK". - 1](/content/2026/05/992041/images/fa8bfdd9c487c9c927480c9f5275cb80248443f15db3d6d6e756fd0daec2ba04.jpg)
3 (Within 7 seconds or so)
Press [I◄◄, REW/V] or [►►I, ∧/FF] to set the time.
4 Press [SHIFT] + [CLOCK/TIMER] to finish setting the time.
The display will return to whatever was displayed before you set the time.
To display the time
Press [SHIFT] + [CLOCK/TIMER] once when the unit is on or at standby mode.
The time is shown for about 5 seconds.
Note
Reset the clock regularly to maintain accuracy.

Using the play/record timer
Remote control only
You can set the timer to come on at a certain time to wake you up (play timer) or to record a radio station or from the aux source (record timer).
The play and record timers cannot be used together.
Preparations:
- Turn the unit on and set the clock (→ page 17).
- For the play timer, prepare the desired music source (tape/CD/radio/aux), and set the volume.
- For the record timer, check the cassette's erasure prevention tabs ( page 15) and insert the tape in deck 2 ( page 14). Tune to the radio station ( page 13) or select the aux source ( page 17).
1 Press [SHIFT] + [CLOCK/TIMER] to select the timer function.
Every time you press the button:
$$ \text { CLOCK } \rightarrow ⓣ \text { PLAY } \rightarrow Ⓢ \text { REC } $$
$$ \text { Previous display } $$
④PLAY: to set the play timer
①REC: to set the record timer
2 ON time setting
① (Within 8 seconds or so)
Press [I◄◄, REW/V] or [►►I, ∧/FF] to set the start time.
②Press [SHIFT] + [CLOCK/TIMER].
3 OFF time setting
① Press [I◄◄, REW/V] or [►►I, ∧/FF] to set the finish time.
②Press [SHIFT] + [CLOCK/TIMER].
The start and finish times are now set.
4 Press [SHIFT] + [◎PLAY/REC] to display the timer indicator.
Every time you press the button:

②PLAY: to turn the play timer on
④REC: to turn the record timer on
(The indicator doesn't appear if the start and finish times or the clock hasn't been set.)
5 Press [ ⏻] to turn the unit off.
The unit must be off for the timers to operate.
- Play timer: Play will start in the set condition at the set time with volume increasing gradually to the set level.
- Record timer: The unit comes on 30 seconds before the set time with the volume muted.
To cancel the timer
Press [SHIFT] + [∅PLAY/REC] to clear the timer indicator from the display.
(The timer comes on at the set time everyday if the timer is on.)
To change the settings (when the unit is on)
To change the play/record times
Do steps 1, 2, 3 and 5.
To change the source or volume
- Press [SHIFT] + [①PLAY/REC] to clear the timer indicator from the display.
- Make changes to the source or volume.
- Do steps 4 to 5.
To change the timer
Press [SHIFT] + [∅PLAY/REC] to select the desired timer.
Every time the button is pressed:

To check the settings
Press [SHIFT] + [CLOCK/TIMER] while the unit is on to select “∅PLAY” or “∅REC”.
The settings are shown in the following order:
Play timer: start time → finish time → source → volume
Record timer: start time → finish time → source
To check the settings while the unit is off, press [SHIFT] + [CLOCK/TIMER] twice.
If you use the unit after the timers are set
After using, check that the correct tape/CD are loaded before turning the unit off.
Note
- If you turn the unit off and on again while a timer is functioning, the finish time setting will not be activated.
- If you selected AUX as the source, when the timer comes on, the unit turns on and engages "AUX" as the source. If you want to playback or record from a connected unit, set that unit's timer to the same time. (See the connected unit's instruction manual.)
Using the sleep timer
Remote control only
This timer turns the unit off after a set time.
While enjoying the desired source:
Press [SLEEP] to select the time (minutes).
Every time you press the button:
![PANASONIC SC-AK521 - Press [SLEEP] to select the time (minutes). - 1](/content/2026/05/992041/images/508bb8e2aa7c70edf29d7fa4aed623ab5b15c61e8f020187cf3dd28d55b8d745.jpg)
To cancel the sleep timer
Press [SLEEP] to select "SLEEP OFF".
To confirm the remaining time
Press [SLEEP] once.
The remaining time is shown for about 5 seconds.
To change the setting
Press [SLEEP] to select the new setting.
You can use the sleep timer in combination with the play/record timer.
Make sure the unit is off before the play/record timer's start time.
Note
The sleep timer will be turned off when you start recording from a CD.
Troubleshooting guide
Before requesting service, make the checks below. If you can't fix the system as described below, or if something not listed here occurs, refer to the enclosed directory to locate an Authorized Service Center convenient to you or contact your dealer.
Reference pages are shown as black circled numbers ⑰.
Common Problems
| Although the unit is in standby mode, the display lights up and changes continuously. | Turn off the demo function.17If you set the clock, demo function will be turned off automatically.17 |
| No sound.Sound stops. | Turn the volume up.Switch off the unit, determine and correct the cause, then switch the unit on. Causes include shorting of the positive and negative speaker wires, straining of the speakers through excessive volume or power, and using the unit in a hot environment. |
| Sound is unfixed, reversed or comes from one speaker only. | Check the speaker connections.6 |
| Humming heard during play. | An AC power supply cord or fluorescent light is near the cables. Keep other appliances and cords away from this unit's cables. |
| “ERROR” is displayed.“--:-:-” appears on the display at standby mode.“F61” is displayed. | Incorrect operation performed. Read the instructions and try again.You plugged the AC power supply cord in for the first time or there was a power failure recently. Set the time.17Check and correct the speaker cords connection.6If this does not fix the problem, there is a power supply problem. Consult the dealer. |
Listening to the radio
| Noise is heard.The stereo indicator flickers or doesn’t light.Sound is distorted. | Use an outdoor antenna.16 |
| A beat sound is heard. | Turn the TV off or separate it from the unit. |
| A low hum is heard during AM broadcasts. | Separate the antenna from other cables and cords. |
When there is a television set nearby
| The picture on the TV disappears or stripes appear on the screen. | The location and orientation of the antenna are incorrect. If you are using an indoor antenna, change to an outdoor antenna.The TV antenna wire is too close to the unit. Separate the antenna wire of the TV set from the unit. |
Using the cassette deck
| Poor quality sound.Recording is not possible. | Clean the heads. See belowIf the erasure prevention tabs have been removed, cover the holes with adhesive tape. 15 |
Playing discs
| The display is wrong or play won’t start. | The disc may be upside down. 8Wipe the disc.Replace the disc if it is scratched, warped, or non-standard.Condensation may have formed inside the unit due to a sudden change in temperature. Wait for about an hour for it to clear and try again. |
| The total number of tracks displayed differs each time the same disc is inserted.Unusual sound is heard. | The disc may be scratched, or its data may be defective. Replace the disc. |
| CD-RW cannot be read.“VBR-” is displayed instead of the remaining play time. | The disc was incompletely formatted. Use the recording equipment to fully format the disc before recording.The unit cannot display the remaining play time for variable bit rate (VBR) tracks. |
| “TAKE OUT/DISC” appears on the display. | There is a problem with the disc mechanism. (A power failure may have occurred.)The tray will open automatically. Remove the disc from the tray, and after ensuring there is no disc in the tray, close it. The unit will make the disc changing noises for a few moments and then it should operate normally. |
Remote control
| Remote control doesn’t work. | Check that the batteries are inserted correctly. 4Replace the batteries if they are worn. |
Maintenance
If the surfaces are dirty
To clean this unit, wipe with a soft, dry cloth.
- Never use alcohol, paint thinner or benzene to clean this unit.
- Before using a chemically treated cloth, read the instructions that came with the cloth carefully.
For a cleaner, crisper sound
Clean the heads regularly to assure good quality playback and recording.
Use a cleaning tape (not included).
AMPLIFIER SECTION PL
PMPO 3500 W
Power output
THD 10%, both channels driven
60 Hz–3 kHz
(Low channel) 55 W per channel (6 Ω)
3 kHz–16 kHz
(High channel) 55 W per channel (6 Ω)
40 Hz–100 Hz
(Subwoofer channel) 140 W (8 Ω)
Total power 360 W (Total)
Power output
THD 10%, both channels driven
1 kHz
(Low channel) 65 W per channel (6 Ω)
10 kHz
(High channel) 65 W per channel (6 Ω)
80 Hz
(Subwoofer channel) 160 W (8 Ω)
Total power 420 W (Total)
Input sensitivity
AUX 250 mV
MIC 0.7 mV
Input Impedance
AUX 13.3 kΩ
MIC 680 Ω
AMPLIFIER SECTION GCP
RMS Power output
THD 10%, both channels driven
1 kHz
(Low channel) 65 W per channel (6 Ω)
10 kHz
(High channel) 65 W per channel (6 Ω)
80 Hz
(Subwoofer channel) 160 W (8 Ω)
Total power 420 W (Total)
Input sensitivity
AUX 250 mV
MIC 0.7 mV
Input Impedance
AUX 13.3 kΩ
MIC 680 Ω
FM TUNER SECTION

Frequency range
87.9 - 107.9 MHz (200 kHz steps)
87.5 - 108.0 MHz (100 kHz steps)

Frequency range
87.50 - 108.00 MHz (50 kHz steps)
Sensitivity
S/N 26 dB 2.2 μV
Antenna terminal(s)
75 Ω (unbalanced)
AM TUNER SECTION

Frequency range
520 - 1710 kHz (10 kHz steps)

Frequency range
522 - 1629 kHz (9 kHz steps)
520 - 1630 kHz (10 kHz steps)
Sensitivity

S/N 20 dB (at 1000 kHz) 560 μV/m

S/N 20 dB (at 999 kHz) 560 μV/m
CASSETTE DECK SECTION
Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response
(+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
S/N
50 dB (A weighted)
Wow and flutter
0.18% (WRMS)
Fast forward and rewind time
Approx. 120 seconds with
C-60 cassette tape
CD SECTION
Sampling frequency
44.1 kHz
Decoding
16 bit linear
Beam source/wavelength
Semiconductor laser/780 nm
Number of channels
Stereo
Frequency response
20 Hz–20 kHz (+1, -2 dB)
Wow and flutter
Below measurable limit
Digital filter
8 fs
D/A converter
MASH (1 bit DAC)
MP3
Bit rate 32 kbps–320 kbps
Sampling frequency
32 kHz, 44.1 kHz, 48 kHz
SPEAKER SECTION
Front speakers SB-AK520
Type 3 way, 3 speaker system
Speaker(s)
Woofer 16 cm cone type
Tweeter 6 cm cone type
Super tweeter 2.5 cm piezo type
Impedance
HIGH 6 Ω
LOW 6 Ω
Input power (IEC)
HIGH 65 W (Max)
LOW 65 W (Max)
Output sound pressure level
83 dB/W (1.0 m)
Cross over frequency
2.6 kHz, 10 kHz
Frequency range
Hz-23 kHz (-16 dB)
44 Hz–22 kHz (−10 dB)
Dimensions (WxHxD)
241 x 360 x 239 mm
Mass
3.8 kg
Subwoofer SB-WAK520
Type 1 way, 1 speaker system
Speaker(s)
Subwoofer 16cm cone type
Impedance
put power (IEC) 160 W (Max)
Output sound pressure level
80 dB/W (1.0m)
Frequency range
40 Hz–220 Hz (−16 dB)
45 Hz–180 Hz (−10 dB)
Dimensions (Wx)
Power consumption in standby mode
PL 0.34 W
GCP 0.85 W
Note
- Specifications are subject to change without notice.
Mass and dimensions are approximate.
-
Total harmonic distortion is measured by the digital spectrum analyzer.
-
The labels "HIGH" and "LOW" on the rear of the speakers refer to High frequency and Low frequency.
Panasonic

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Parte interior del aparato
Índice

①Indicador de alimentación de CA [AC IN]
Reproducción
(Canal de subgraves) 140 W (8 Ω)
Potencia total 360 W (Total)
NORMAL (TIPO I) 35 Hz - 14 kHz
32 kHz, 44,1 kHz, 48 kHz