CR 1730 - Turntable DUAL - Free user manual and instructions

USER MANUAL CR 1730 DUAL

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Alignment positions CR 1710

Alignment positions CR 1730

Functional description

Alignment instructions

Bloc diagram CR 1710

Bloc diagram CR 1730

Wiring diagram CR 1710

Wiring diagram CR 1730

IC - bloc diagram

Printed circuit boards

Replacement Parts CR 1710

Exploded view CR 1710

Exploded view CR 1730

Replacement Parts CR 1730

Tuning (Scale Pointer)

Volumen, Balance, Loudness

Tape 1, Tape 2, Aux (Cinch, DIN)

Volumen, Balance, Loudness

Description of functions for CR 1710 and CR 1730

FM tuner section

The receiver has one symmetrical 240/300 Ohm and one asymmetrical 60/75 Ohm antenna input. From the antenna, the RF signal reaches the VHF section and passes through the following stages:

Tunable antenna input circuit

Junction FET RF amplifier

Twofold tuned RF circuit

Mixing stage

Oscillator

Tunable capacitance diode for AFC

First IF stage

FM IF

In the output of the VHF section, the RF signal is converted to an intermediate frequency of 10.7 mHz and routed to the first IF amplifier stage TR 101 via a ceramic filter CF 101. Via the ceramic filter CF 102 and CF 103, from the collector it reaches pin 1 of IC 101, a six-stage IF amplifier and demodulator. Demodulation is carried out in conjunction with coils T 101 and T 102.

Stereo decoder

From the AF output pin 6 of IC 101, the signal is routed to pin 2 of the integrated stereo decoder IC 102. In addition to the PLL decoder, the IC comprises an automatic stereo/mono switchover circuit and the driver circuit for the stereo display. The free running frequency of the VCO is set with VR 102 and VR 103 can be used for adjustment to optimum channel separation. The low pass filters LPF 101 and 102 suppress 19 kHz components in the decoded AF signal. The stereo switching threshold is adjusted with VR 101 at an RF input voltage of 8 μV.

AM tuner section

The AM antenna is inductively coupled to the input circuit with a high impedance. S 101 switches primary and secondary circuits of the ferrite antenna and the oscillator circuits. IC 103 comprises the RF amplifier, the mixing stage, the IF amplifier, the rectifier circuit, the automatic gain control and the field strength control. From pin 12 (IC 103), the rectified AF circuit reaches the stereo decoder input pin 2 (IC 102) via R 149, R 146, C 134 and R 145, and then follows the same course as the FMAF signal.

AFC

The AF DC voltage from the demodulator IC 102 pin 7 is amplified with IC 104 in order to achieve a large AFC control range. However, in order to prevent excessive extension of the AFC holding range, D 110 and D 111 are contained in the control loop for the purpose of limitation.

FM station memory

The receiver is equipped with a 5 V station memory. The tuning voltage which is routed to the capacitance diodes (D 901, D 902, D 903 and D 904) is adjustable with the controls VR 605, VR 606, VR 607, VR 608 and VR 609. The tuning voltage for MANUAL position is generated with control # 108 which is coupled to the rotary capacitor VC 101. The tuning range can be adjusted with controls VR 601, VR 603 and VR 604, VR 601 and VR 603 are effective in the MANUAL range. The base voltage for the-station memories is adjusted with VR 604.

Only CR 1710

Station direction

The station direction display shows the direction in which the controls of the station memories must be turned in order to achieve the same reception frequency as the one shown on the tuning scale. The circuit operates with the voltage difference between the station memory and the manual scale tuning. If the voltage of the station memory is greater than that of the manual control, the red display lights up. The direction of the arrow shows the direction in which the key switch must be turned. Both LEDs light up when the voltage difference between the two control approaches 0 V (approximately 15 mV). The two voltages are routed to IC 701 which operates as an impedance converter. The differential amplifier IC 702 has a gain of approximately 35 dB. If the voltage difference between the station memory and MANUAL is less than ±15 mV, the transistors TR 701 and TR 702 are reverse biased and a current flows through the diodes D 756, D 701 and D 757. If the differential voltage is ±15 V, TR 701 or TR 702 is forward biased. If the voltage through the Zener diode D 701 is less than the negative bias voltage, the diode is negative biased and either LED D 756 or D 757 lights up.

Signal

The signals for the AM and FM field strength display are routed from pin 15 IC 103 and pin 13 IC 101 to IC 703 via VR 701 or VR 702.

IC 703 drives five LEDs proportionally to the input DC voltage. In AM mode, VR 701 is adjusted at an RF input voltage of 10 mV in such a way that the fifth LED lights up. In the same way, in FM mode VR 702 is adjusted with an input voltage of 200 μV.

Tuning (scale pointer)

The tuning indicator is driven by the DC voltage signal from pin 12 of the FM IF IC 101. This voltage also controls the automatic stereo/mono circuit. The switching threshold for the output signal at pin 12 of IC 101 can be adjusted with VR 101. At the factory, the switching threshold is set to an RF input voltage of 8 V . The DC voltage signal controls transistor TR 703 and switches the small light on the scale pointer.

Muting

The muting switches S 601-6 (station memory) and S 102-3 (band switch) are mechanically actuated when the band switch and station buttons are operated. The muting signal (active low) reaches the base of TR 218. Via the Zener diode D 205, this switches transistor TR 201 which is parallel to the input of the output stage and which mutes the output stage. In this way, switching noises occurring during operation of the function buttons are suppressed.

Only CR 1730

Signal

The signals for AM and FM field strength display are routed from pin 15 IC 103 and pin 13 IC 101 to IC 703 via VR 704 or VR 703. IC 703 drives five LEDs proportionally to the input DC voltage.

In AM mode, VR 704 is set at an RF input voltage of 10 mV in such a way that the fifth LED lights up. In the same way, in FM mode VR 703 is adjusted with an input voltage of 200 V.

Tuning

The FM tuning indicator operates with a circuit which consists of 12 transistors (TR 701 - TR 712), four diodes and LEDs. Five pieces of information are gated for indication of the ratio zero passage.

1. FM switched
2. First field strength LED
3. Field strength modulation
4. Muting pulse
5. Curve of the ratio filter

In AM mode, a high signal is routed to the base of TR 702 via R 745 and D 705, as a result of which the transistor becomes forward biased and LED D 8 (green) can no longer light up.

The modulation signal for the first LED D 701 from pin 9 IC 703 is also routed to the base of TR 701. TR 701 becomes forward biased and prevents TR 702 from also becoming forward biased.

A field strength-dependent signal is routed from pin 13 IC 101 to the base of TR 711. As the voltage increases, TR 711 becomes more conductive and permits TR 709 or TR 710 to switch through.

The muting signal from pin 12 IC 101, which becomes low when the station is exactly tuned, reaches the bases of TR 712 and TR 710. Depending on the amplitude of the muting signal, TR 710 becomes conductive (in the case of tuning by approximately 200 kHz) or TR 709 becomes conductive via TR 712 (in the case of tuning by 100 kHz), resulting in activation of the LEDs D 6 and D 10 or D 7 and D 9.

The ratio voltage is routed to the differential amplifier TR 705 and TR 706 and, via TR 704 or TR 703, TR 708 or TR 707 becomes conductive, as the result of which the operating voltage reaches the LEDs D 9 and D 10 or D 6 and D 7.

Muting

The muting switches S 601-6 (station memory) and S 102-3 (band switch) are mechanically actuated when the band switch and station buttons are operated. The muting signal (active low) reaches the base of TR 222. Via the Zener diode D 213, this switches transistor TR 201 which is located parallel to the input of the output stage and which mutes the output stage. In this way, switching noise occurring during actuation of the function buttons is suppressed.

Display

FM frequency display: the FM oscillator frequency is routed to IC 701 via the isolating amplifier in the VHF section TR 904. IC 701 is a single edge ECL predivider with a fixed division ratio of 100. At the output pin 2, the square-wave signal is applied which corresponds to the TTL level and which is routed to IC 702 which, in its turn, drives the fluorescent display during static operation. The frequency display in the FM range can be varied with the control VR 702.

AM frequency display: via the isolating amplifier TR 101, the AM oscillator signal (long wave-medium wave) reaches the input of IC 702. The AM frequency display can be varied with control VR 701.

CR 1710: AF section

Phono (cinch, DIN)

The two-stage phono equalizer preamplifier comprises noise-free transistors. The input sensitivity is switched over with switch SW 02. The input sensitivity for nominal output power is 1.8 mV and 5 mV at 1 kHz. The equalization is carried out in the negative feedback branch with 3180, 318 and 75 μs corresponding to the recording characteristic equalization. The components determining the frequency are R 15, R 17, C 13 and C 15 in the left channel and R 16, R 18, C 14 and C 16 in the right channel. The gain is approximately 41 dB at 1 kHz at the 1.8 mV switch setting.

Tape 1 and Tape 2 (cinch, DIN)

In order to guarantee an input impedance of 470 kOhm, there is an impedance converter (TR 05) after the input selector switches S 01-1 to S 01-5.

Tone controls

The tone controls are located in the negative feedback branch of the transistors TR 301 and TR 302. VR 301 serves to adjust the treble frequencies and VR 302 serves to adjust the base frequencies.

Mono

The left and right channels are merged with the mono switch (S 301-1). A level surge due to the addition is prevented with resistors R 331 and R 332. Via R 135 and D 105, operating voltage is applied to pin 16 of IC 102 and, as a result of this, the stereo decoder is switched to MOND.

Volume, balance, loudness

The volume control VR 201 is located on the front of the output amplifier. Equally, the balance control VR 202 is located on the front of the output amplifier board. It is designed such that only one channel is active when the control is set to extreme right or left-hand position. At a volume level of -40 dB, the loudness circuit causes boosting of +12 dB at 40 Hz and +6 dB at 15 kHz.

Output stage

The transistors TR 201 and TR 202 perform the muting function (see muting). The output amplifier is a non-ferrous complementary output stage with an AF output having neither DC voltage nor electrolytic capacitors. Via the deferential amplifier TR 203 and TR 204, the AF signal is routed to the transistors TR 205 and TR 206. The zero signal current is stabilized via TR 207 and TR 208. The complementary driver transistors (TR 209, TR 210, TR 211 and TR 212) amplify the AF signal and drive the power output transistors TR 213, TR 214, TR 215 and TR 216, which are also complementary. The output signal is routed to the loudspeaker connections via the fuse FU 201 and the switching contacts of the headphone socket. The loudspeaker outputs are deactivated by connecting a plug to the headphone socket.

Power supply unit

The power supply unit is designed for supply voltages of 230 V and 115 V (AC voltage). In order to convert the voltage, the fuses (FU 501 and FU 502) on the power supply board must be changed in accordance with the data printed on the board. The secondary side of the mains transformer has two windings: one main winding for generation of the operating voltage for the output amplifier, the preamplifier, the impedance converter, the equalizer preamplifier, for generation of the tuning voltage and operating voltages of the RF section and a smaller windings for the lamps for illumination of the tuning scale. IC 501 is a special integrated circuit which compensates for temperature drifts.

CR 1730: AF section

Phono (cinch, DIN)

Refer to the details on the phono input of the CR 1710.

Tape 1, tape 2, aux (cinch, DIN)

In order to guarantee an input impedance of 470 kOhm, an impedance converter (TR 05) is located after the input selector switch (S 01-1 to S 01-6). In addition, tape 1 has an impedance converter (TR 07) for the monitor function. When the front sockets of tape 2 are occupied, the sockets for tape 2 on the rear are deactivated.

Monitor

The signal from tape 1 can be directly switched through with the monitor switch S 103. An impedance converter (TR 07) ensures correct matching.

Tone controls

The tone controls are located in the negative feedback branch of TR 301 and TR 302. VR 301 serves to adjust the treble frequencies and VR 302 serves to adjust the base frequencies.

High and low filters

The filters have a drop of 12 dB per octave, response frequency of the low filter (S 201-1) at 50 Hz and of the high filter (S 201-2) at 6.5 kHz.

Mono

The left and right channels are merged by the mono switch (S 201-3). A level surge caused by the addition is prevented with resistors R 433 and R 434. Via R 135 and D 105, operation voltage is applied to pin 16 of IC 102 and the stereo decoder switches to MONO.

Volume, balance, loudness

The volume control VR 401 is located on the front of the output amplifier. Equally, the balance control VR 402 is located on the front of the output amplifier board. It is designed such that only one channel is active when the control is set to the extreme right or left-hand position. At a loudness level of -40 dB, the loudness circuit causes boosting of +12 dB at 50 Hz and +6 dB at 10 kHz.

Output stage

The transistors TR 201 and TR 202 perform the muting function (see muting). The output amplifier is a non-ferrous complementary output stage having an AF output without DC voltage and without electrolytic capacitors. Via the differential amplifier DR 203, the AF signal is routed to the transistor TR 207. The zero signal current is stabilized via TR 205 and adjusted with VR 201. The complementary driver transistors (TR 209, TR 211) amplify the AF signal and drive the power output transistors TR 213 and TR 215, which are also complementary. The output signal is routed to the loudspeaker output and the headphone connection via the switching contacts of the relay and the "speaker" selector switch S 502. If the "speaker" selector switch is in position "1 and 2", the connected pairs of speakers are series connected in each channel.

Speaker protection circuit

The task of the protective circuit is to prevent a voltage from reaching the speaker output should a defect occur. This is achieved by TR 221 becoming reverse biased and relay RY 201 becoming de-energized, as a result of which the switching contacts interrupt the AF path. Under normal operating conditions, TR 221 in the protective circuit is the only transistor which becomes conductive.

If, in the event of a defect, a positive or negative DC voltage is applied to the loudspeaker output in the area of the power transistors TR 213—TR 216, D 207 detects the positive DC voltage. TR 220 becomes conductive, the base of TR 222 becomes low and thus TR 222 becomes negative biased. In the case of a negative DC voltage, the diodes D 208 and D 209 become conductive, TR 221 becomes negative biased and the relay is de-energized.

If there is a short-circuit at the speaker output, the voltage drop over R 231 (TR 230) increases, transistor TR 217 becomes conductive, the base voltage at TR 219 drops and thus this transistor becomes forward biased. Via D 207, the positive DC voltage is switched through TR 220, TR 221 becomes negative biased and the relay is de-energized.

Switch-on delay: the relay is not energized until both speaker outputs reliably conduct 0 V DC voltage.

Power supply unit

The power supply is designed for supply voltages of 230 V and 115 V (AC voltage). To convert the voltage, the fuses (FU 501 and FU 502) must be changed on the power supply board in accordance with the data printed on the board. The secondary side of the mains transformer has two windings: one main winding to generate the operating voltage for the output amplifier, the preamplifier, the impedance converter, the filter circuit and the equalizer preamplifier. The other winding is for the RF section and the bias voltage of the fluorescent display. The tuning voltage of the capacitance diodes is also generated by the main winding and rectified via diodes D 502 and D 503. The FM tuning voltage is stabilized with IC 502, which compensates for temperature drifts.

Adjustment instructions for CR 1710 / CR 1730

Signal source	Signal source adjustment	Unit adjustment	Display unit connection	Adjustment position	Adjustment
AM-IF
Loosely couple a wob-bulator to the ferrite antenna	455 kHz	Transmitter-free frequency	Oscilloscope to TP 3 and P 102, pin 2 (±)	T 103, T 106	Maximum and symmetry
MW-RF, signal indication, LW-RF
AM signal generator via DIN dummy antenna to antenna input	1 kHz, 30 % modulated		Oscilloscope and AF voltmeter via 4 Ohm resistance to loud-speaker output
	510 kHz 50 - 100 μV	Bottom end		T 105	Maximum
	1650 kHz 50 - 100 μV	Top end		TC 104	Maximum
				Repeat adjustment several times
	600 kHz 10 - 50 μV	600 kHz		Ferrite antenna MW	Maximum
	1400 kHz 10 - 50 μV	1400 kHz		TC 102	Maximum
				Repeat adjustment several times
	1000 kHz 10 mV	1000 kHz		CR 1710 CR 1730 VR 701 VR 703	Fifth LED must light up
	145 kHz 50 - 100 μV	Bottom end		T 104	Maximum
	350 kHz 50 - 100 μV	Top end		TC 103	Maximum
				Repeat adjustment several times
	160 kHz 10 - 50 μV	160 kHz		Ferrite antenna LW	Maximum
	320 kHz 10 - 50 μV	320 kHz		TC 101	Maximum
FM-IF				Repeat adjustment several times
Wobbulator to IF and GND	Aprox. 10.7 MHz	AFC from transmitter-free frequency	Oscilloscope to TP 2 and P 102, pin 2 (±)	T 101, T 102	S-curve to maximum and symmetry
FM-RF
FM signal generator to 75/60 Ohm antenna input	±40 kHz Dev. Modulated 1 kHz	AFC from FM-Station man.	Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output
	87.5 MHz 1 - 2 μV	Bottom end		VR 603	Until signal received
	108.5 MHz 1 - 2 μV	Top end		VR 601	Until signal received
		FM Station 1		Repeat adjustment several times
	87.5 MHz 1 - 2 μV	Bottom end		VR 604	Until signal received
	>108 MHz 1 - 2 μV	Top end			Check for signal reception
AFC, harmonic distortion				Repeat adjustment several times
FM signal generator to 75/60 Ohm antenna input	Approx. 98 MHz without signal	FM-Station man.	Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output DC voltmeter to P 105, pins 1 + 2	T 101	0 V ±50 mV (DC-Voltm.)
	Approx. 98 MHz 1 mV	To signal		T 102	Minimum harmonic distortion
FM, MPX, VCO, Stereo channel separation				Repeat adjustment several times
Stereo modulator via FM signal generator to 60/75 Ohm antenna input			Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output, frequency meter to TP 1 and P 104, pin 5 (±)
	Approx. 98 MHz without signal	FM-Station man.		VR 102	76 kHz ± 0.05 %
	Approx. 98 MHz 1 mV only left channel	FM-Station man. to signal		VR 103	Maximum channel separation
	Approx. 98 MHz 1 mV only right channel	FM-Station man.			Check channel separation for maximum
Signal display FM				Repeat adjustment several times
FM signal generator to 60/75 Ohm antenna input	Approx. 98 MHz 200 μV	FM-Station man. to signal	Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output	CR 1710 CR 1730 VR 702 VR 703	Fifth LED must light up
Scale pointer, Stereo trigger CR 1710 Repeat adjustment several times
FM signal generator to 75/60 Ohm antenna input	Approx. 98 MHz 8 μV modulated only right channel or left channel	FM station man. to signal	Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output	VR 101	Lamp must light up
Stereo trigger CR 1730 Repeat adjustment several times
FM signal generator to 75/60 Ohm antenna input	Approx. 98 MHz 8 μV modulated only right channel or left channel	FM station man. to signal	Oscilloscope and AF voltmeter via 4 Ohm load resistance to loudspeaker output	VR 101	To stereo switchover
Station Direction CR 1710
		At P 701, short-circuit pins 4 + 5	DC voltmeter to P 511, pin 6 and R 729	VR 703	To 0 V ± 10 mV
Tuning CR 1730
FM signal generator to 75/60 Ohm antenna input	98 MHz 1 - 2 μV	FM station man. to signal	DC voltmeter via R 727	VR 705	To 0 V ± 10 mV
Display CR 1730, FM frequency display
FM signal generator to 60/75 Ohm antenna input	98,000 MHz 1 mV	FM station man. to signal	Short-circuit pin 2 of P 702 with pin 7 of P 701	VR 702	Display to 98.000 MHz, 100 kHz display must not flicker
AM frequency display
AM signal generator via DIN dummy antenna to antenna input	1000 kHz 1 mV	To signal		VR 701	Display to 1000 kHz
AF, Zero signal current CR 1730
		Selection: Aux Volume : Minimum	DC voltmeter to P 203, P 1 + 4 left channel, DC voltmeter to P 204, pins 1 + 4 right channel	VR 201VR 202	Approx. 7 mAApprox. 7 mA

Mémoire de stations FM

Tuning (Scale Pointer)

Volume, Balance, Loudness

Tape 1, Tape 2, Aux (Cinch, DIN)

Volume, Balance, Loudness

Electronic circuit diagram with labeled components including ICs, transistors, capacitors, and resistors for signal processing or measurement.

14 V 13 V CF 102 229 CF 103 05 R 107 27 k R 106 100 k D 106 HV-80 C 114 10 n VR 101 50 k R 112 10 k R 109 150 R 108 2.2 k R 110 100 k C 107 47 n C 108 47 n C 109 100 k R 163 22 k R 164 33 k R 119 150 k IC 101 LA 1231 N IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C IC 102 μPC 1161 C I4 V C 129 10 μ C 128 510 p C 127 3.3 k C 127 4.7 μ LPF 101 R 137 3.3 k P 104-6 R 129 3.3 k C 128 4.7 μ LPF 6x2 R 138 3.3 k P 104-4 R 139 3.3 k P 104-3 + D B.23 TP.2 R 167 330 TR 181 250 389 TP.2 C 182 330 C 183 470 μ S 8 V D 185 8.8 k D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 185 8.2 EB S 8 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 2 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 4 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 5 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V D 6 V

105.3 E 6 P 7014 P 701-2 P 105-2 P 701-1 C 6 P 7013 R 721 880 0 V TR 702 2 SC 2634 R 740 10 k D 703 1.5 2473 R 724 10 k R 723 33 R 727 56 k R 727/339 k R 705 1k R 728/10 k R 705 5.3 V R 726 2.2 k 4.2 V R 726 2.2 k R 736 56 k TR 702 2 SC 2634 D 701 1.5 2473 D 702 1.5 2473 R 727/339 k R 727/339 k R 728/10 k R 705 5.3 V R 726/10 k R 705 5.3 V R 726/10 k R 705 5.3 V TURING C 734 2 SC 2634 R 731 10 k TURING C 730 15 K R 734 22 K TR 712 2 SC 2634 R 731 10 K R 733 10 K R 725 10 K R 705 2.2 K STEREO R 709 2.2 K R 709 2.2 K IC 735 21 n C 735 21 n IC 702 LC 7258 IC 354 Display +706 P 111-1 P 705 C S R 608 90 K VR 609 100 K W 601-(2) W 601-(1) F 602 - 1 (2) S 601-2 S 601-1 MAN C 602 1 M VR 601 10 k P 601-3 P 601-2 P 602-2 =706 A4 P 106-2 ← P '04-3 → C '05/220 μ → R '742/476 → R '703 / '100 k → C '708/47' → R '741/476 → SP '8029 → C '708/47' C5 P 102-4 ← P '02-4 (FM IN) → C '704/16 n → R '742/476 → R '703 / '100 k → C '708/47' C5 P 111-3 ← P '02-4 (FM IN) → C '704/16 n → R '742/476 → R '703 / '100 k → C '708/47' A4 P 102-2 ← P '02-4 (FM IN) → C '708/47' → R '705/47' → R '741/476' → R '703 / '100 k → C '708/47' B5 P 111-5 ← P '02-4 (FM IN) → C '708/47' → R '741/476' → R '703 / '100 k → C '708/47' TP P '04-3' ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' C5 P 111-6 ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' A4 P 106-1 ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' C5 P 111-2 ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' C5 P 111-4 ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' C5 P 111-5 ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' A 23 - E ← P '04-3' → R '742/476' → R '703 / '100 k → C '708/47' ~2.3 V

GND P 01 C 26 47 n D PHONO 3 C r.K. AUX 3 C R 36 100 k R 34 470 k R 33 470 k R 29 100 k R 35 =62 R 36 =64 R 32 100 k R 35 =63 R 31 100 k R 31 Tape 1 L REC R TAPE 2 L REC R A 13 14 15 16 C 01 4.7 μ R 03 1 k C 05 4.7 n C 09 22 μ C 11 100 p TR 01 2 SA 1127 R 05 100 k R 27 680 O PRE- LEVEL S 02 R 11 1.2 k R 09 32 k C 13 6.8 n C 15 6.8 n R 17 39 k R 15 570 k R 17 1 k C 19 2.2 μ C 17 100 μ C 21 160 μ C 22 +100 μ S 01-2 d S 01-2 b S 01-2 d S 103 r.K. R 63 100 P 35 P 36 P 33 P 34 P 37 =65 P 38 r.K. S 01-4 r. Tape 2 (FRONT) P 07 P 96 r.K. S 01-2 e P 11-1 P 12-1 r.K. S 01-6 f S 01-6 g r.K. S 01-5 f S 01-4 i r.K. S 01-3 f Die Positionbezeichnung für die Bauteile desrechten Kanais = linker Kaaii + 1 Beispiel: I.K. R 217 = r.K. R 218 The numbers of position by the electronic components of the right channel = left channel + 1 Les chiffre des parts électroniques du canal droit = canal gauche + 1

C 15 X P 13-1 P 302-2 R 301 100 k C 304 100 p R 305 1.8 k VR 302 100 k R 315 4.7 k TREBLE C 307 1 n R 309 5.6 k C 309 1 μ R 307 300 k R 311 27 k BASS C 303 27 n VR 301 100 k r.K. R 321 1.5 k C 311 10 p R 325 2.2 μ C 31L 2.3 μ -16.4 V C 401 82 n R 401 10 C 403 39 n R 405 30.9 k TR 301 2 SC 2634 5 V R 407 100 k R 409 10 k C 405 2.2 p R 413 100 k r.K. D 301 RD 51 EB 100 μ MONITOR S 103 r.K. R 43 1 k R 49 100 k R 53 100 k C 23 + - R 45 1 M C 31 10 k C 25 4.7 μ R 51 100 k P 13-3 P 301 P 234 P 16-1 15.7 V r.K. D 214 RD 15 EB 3 R 257 3.9 k C 215 220 μ R 225 47 + - TR 205 2 SA 092 C 209 10 p D 201 STY 34 Y R 219 22 + C 211 1 μ + V D 207 A TR 209 2 SD 667 A -37.4 V O V R 227 220 + - TR 207 2 SC 1845 -11 V R 228 19 k R 226 47 + C 219 47 p + r.K. TR 207 2 SC 1845 -38.8 V R 221 -39.5 V r.K. TR 211 2 SB 647 A + POWER +501 D 505 S 135 +502 R 518 +502 P 512 +502 B 22 -29.3 V +506 P 518 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B 22 -29.3 V +506 B/BL/C/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/A/B/C/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/S/ 6 17 18 19 HIGH C S 201-2 S 201-2 T R 49 R TR 05 R R 48 R TR 47 R R 47 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R,R S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S.S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S, L K N L O L I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N IN I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N I N IINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINIINlAICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICICACCCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCCDDCCC DSSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLSLCSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSLLSII SSISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISISIsisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisisis isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi isi is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is i is if it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same as it's the same to be a bit of the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to be a bit of the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the outputs to be a bit of the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the output to the out of this section: TR 207 B:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78V-RA:78Mn n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n m l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILs ILa II III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III III IIIIII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII-II

OW 201-1 HIGH S 201-2 R 413 100 k R 415 3,6 k C 407 2,7 n C 419 1 k R 419 1 k C 411 6,8 n C 409 1 k R 427 100 TR 403 2 SC 2634 20 V R 425 10 k R 413 270 k R 433 1 k MONO S 201-3 r.K. LOUDN. S 201-4 C 419 8 p R 437 220 k R 435 5,1 k VOL. VR 401 100 k BRAL. r.K. 20,2 V TR 351 2 SD 381 20,7 V C 357 100 μ C 353 100 μ D 351 P 401-2 B 6 P 401-1 B 6 +A B 20 P 205-6 +A B 20 TR 209 2 SD 667 A -37,4 V R 227 220 R 235 3,3 k R 237 27 k D 205 IS 2473 R 241 27 k + B 20 P 205-4 L 521 μH C 521 47 n R 521 10 R 523 10 R 525 120 OFF- SPEAKER 1 1,2 20 1 SPEAKER 2 1+2 O 2 P SPEAKER 2 + + D TR 211 2 SB 647 A -3 mV R 229 220 R 231 2 x 0,33 TR 215 2 SB 618 -0,6 V C 219 47 p C 230 0,1 μ P 205-5 -B A 20 +39,5 V P 511-4 +A P 511-3 -B R 502 680 P 511-5 +C IC 501 S 74 J GND P 563 A 18 P 168-2 FU 181 T 400 mA A 18 P 109-1 A 18 P 188-1 FU 182 T 400 mA -16,3 V -16,3 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6,5 V -6, Änderungen vorbehalten Alterations reserved Sous réserve de modifications Ausgabe 1/Januar 1981 -2,3 V -E

2 SA 798

2 SB 647 2 SC 1675 2 SD 667

2 SA 992 2 SA 1127 2 SC 1845 2 SC 2634 2 SK 61

2 SC 461 2 SC 535

2 SA 769 2 SC 1827 2 SD 381

graph TD
    A["IF 1"] --> B["LA 1231"]
    B --> C["IF amp. limiter"]
    C --> D["1st"]
    D --> E["2nd"]
    E --> F["3rd"]
    F --> G["4th"]
    G --> H["5th"]
    H --> I["6th"]
    I --> J["Quadrat. limiter"]
    J --> K["Quadrat. detection"]
    K --> L["AFC/ tuning meter drive"]
    L --> M["AFC"]
    M --> N["Mute contr."]
    N --> O["AF amp. Mute"]
    O --> P["MUTING BAND WITH"]
    P --> Q["OUT AF"]
    Q --> R["MUTING DRIVE"]
    R --> S["Signal meter out."]
    S --> T["Level detect."]
    T --> U["Level detect."]
    U --> V["Level detect."]
    V --> W["Inverse in."]
    W --> X["Level detect."]
    X --> Y["Mute out"]
    Y --> Z["OUT AGC"]
    Z --> AA["IF amp. shut off"]
    AA --> AB["IF amp. shut off"]
    AB --> AC["1st"]
    AC --> AD["2nd"]
    AD --> AE["3rd"]
    AE --> AF["4th"]
    AF --> AG["5th"]
    AG --> AH["6th"]
    AH --> AI["Quadrat. Detection"]
    AI --> AJ["AFC/ tuning meter drive"]
    AJ --> AK["MUTING BAND WITH"]
    AK --> AL["OUT AF"]

V+ 8 7 6 5 TL 082 AN 6552 TBC 1458 V-

graph TD
    A["SP 8629 + 100 Prescaler"] --> B["÷5 ECL Counter"]
    B --> C["÷5 ECL Counter"]
    C --> D["÷4 ECL Counter"]
    D --> E["ECL+TTL Translator"]
    E --> F["TTL GND"]
    E --> G["TTL V+"]
    F --> H["Z-Diode"]
    G --> H
    I["GND ECL 4"] --> J["÷5 ECL Counter"]
    K["V+ ECL 8"] --> L["÷5 ECL Counter"]
    M["2"] --> N["ECL+TTL Translator"]
    O["3"] --> P["TTL GND"]
    Q["1"] --> R["TTL V+"]

graph TD
    A["FIN"] --> B["OSC in"]
    B --> C["OSC out"]
    C --> D["Timing CONTROL"]
    D --> E["COUNTER FOR 1/4 MHz"]
    E --> F["AM Fine"]
    E --> G["FM Fine"]
    E --> H["SW Fine"]
    E --> I["SF Ena"]
    E --> J["FM AM1 AM2"]
    E --> K["US LOCK"]
    L["V+"] --> M["21"]
    N["GND"] --> O["7"]
    P["5/4 Digit"] --> Q["12"]
    R["Vref"] --> S["10"]
    T["SEGMENT OUTPUT"] --> U["22-42"]
    V["SEGMENT DRIVER"] --> W["LATCH"]
    X["FREQUENCY COUNTER"] --> Y["IF FREQUENCY CONTROL"]
    Z["IF FREQUENCY FINE ADJUSTMENT CIRCUIT AM 30 steps FM 30 steps"] --> AA["3"]
    AB["CONTROL"] --> AC["&"]
    AD["&"] --> AE["&"]
    AF["SEGMENT DRIVER"] --> AG["LATCH"]
    AH["FREQUENCY COUNTER"] --> AI["IF FREQUENCY CONTROL"]
    AJ["IF FREQUENCY FINE ADJUSTMENT CIRCUIT AM 30 steps FM 30 steps"] --> AK["3"]

1 4 7 3 6 5 8 9 13 V+ 11 12 RFA-2 CCMV IFA 2 IFA 3 DET. LA 1240 RFA-1 IFA 1 AGC DRIV. SM DRIV. 2 16 10 15 14 GND

graph TD
    A["16"] --> B["V.C.O. 76 kHz"]
    B --> C["PHASE LOCK DETECTOR"]
    C --> D["PILOT PRESENCE DETECTOR"]
    D --> E["STEREO SWITCH LAMPDRIVER"]
    E --> F["μPC 1161"]
    F --> G["PRE AMP."]
    F --> H["NF AMP."]
    G --> I["MPX IN"]
    H --> J["38kHz TO 19kHz DIVIDER"]
    J --> K["STEREO DEMODULATOR"]
    K --> L["L CH POST AMP."]
    K --> M["R CH POST AMP."]
    L --> N["RIGHT OUT"]
    M --> O["LEFT OUT"]
    N --> P["GND"]
    O --> Q["GND"]
    B --> R["ST-MONO SW. V.C.O.STOP SWITCH"]
    R --> S["76kHz TO 38kHz DIVIDER"]
    S --> T["38kHz TO 19kHz DIVIDER"]
    T --> U["STEREO DEMODULATOR"]
    U --> V["L CH POST AMP."]
    U --> W["R CH POST AMP."]

V+ Vref 2 B 5 4 6 LB 1416 LB 1426 3 1 14 OUT GND 7 D 5 13 D 4 12 D 3 11 D 2 9 D 1

V+ 8 7 6 5 OFFSET NULL μPC 741C OFFSET NULL V-

Circuit board layout diagram with component labels and pin connections

Tunerplatte / Tuner PWB / Plaquette HF L

FM Frontend Unit P-101 C153 L101 (L 102) Ant Ant ABC GND IF OUT AFC AFC B1 B2 C157 C155 P-102 R-162 C134 #111 R-147 R-150 C143 T-09 D-09 C135 C141 C-145 R-145 R-149 R-149 R-148 R-147 R-150 LA-12.0 C-145 R-152 S-101 S-101 R-153 T-105 J-106 U-107 T-103 T-105 C-151 T-05 HW-01 T-04 LW-01 C-49 C-48 T-05 HW-01 T-04 HW-01 IR-173R-161 (R-154) (R-156) (R-255) (R-256) (R-257) (R-258) (R-259) (R-260) (R-261) (R-262) (R-263) (R-264) (R-265) (R-266) (R-267) (R-268) (R-269) (R-270) (R-271) (R-272) (R-273) (R-274) (R-275) (R-276) (R-277) (R-278) (R-279) (R-280) (R-281) (R-282) (R-283) (R-284) (R-285) (R-286) (R-287) (R-288) (R-289) (R-290) (R-291) (R-292) (R-293) (R-294) (R-295) (R-296) (R-297) (R-298) (R-299) (R-300)

1 2 3 4 5 C155 C157 R102 (L102) L101 C153 P101 B1 AFC AFC F IF GND AGC ANT AN. F M Frontend Unit AEC AEC AEC C101 CF101 R101 R102 R103 C107 TR101 R104 CF102 CF103 WR101 J101 C104 R112

Electronic circuit board diagram with component labels and part numbers, including resistors, capacitors, inductors, and transistor sections.

J 702 J 701

Filterplatte CR 1730 /
Filter plate CR 1730 /
Plaque de Filtre CR 1730

B

P409 P408 P407 P406 P405 P404 P403 P402 C402 R414 R408 R404 R406 R412 R413 R407 R403 C401 C403 C404 TR402 R411 R405 R409 TR401 C405

Monitorplatte CR 1730 /
Monitor plate CR 1730 /
Plaque monitor CR 1730

3 1 P16 R L 2 Monitor S03 1 P18 2 P 17 1

L
Volumeplatte CR 1730 /
Volume plate CR 1730 /
Plaque de volume CR 1730

B

#305 #306 #201 J409 J410 #202 VR401 Volume

203 E C B TR 213 TP J 210 J 213 C217 J 217 R217 D 209 R217 R235 R 237 D 205 C216 R 241 C 216 D 205 J 213 C208 R 218 (1/4) C204 R 219 R 224 R 210 R 214 R 216 R 217 R 215 R 226 (1/2) R 216 R 215 R 214 R 213 R 212 R 208 R 204 C204 C 206 C 208 C 209 C 210 C 211 C 212 C 213 C 214 C 215 C 216 C 217 C 218 C 219 C 220 C 221 C 222 C 223 C 224 C 225 C 226 C 227 C 228 C 230 C 231 C 232 C 233 C 234 C 235 C 236 E C B TR 216 D 202 P 204 J 223 J 224 J 225 R 230 (1/2) J 226 TR 212 R 230 R 240 R 241 TR 209 R 250 TR 208 R 251 TR 207 D 207 D 208 R 259 D 308 P 309 R 310 R 311 D 312 D 313 D 314 D 315 D 316 D 317 D 318 D 319 D 320 D 321 D 322 D 323 D 324 D 325 D 326 D 327 D 328 D 329 D 330 D 331 D 332 D 333 D 334 D 335 D 336 D 337 D 338 D 339 D 340 D 341 D 342 D 343 D 344 D 345 D 346 D 347 D 348 D 349 D 350 D 351 D 352 D 353 D 354 D 355 D 356 C 357 C 358 C 359 C 360 C 361 C 362 C 363 C 364 C 365 C 366 C 367 C 368 C 369 C 370 C 371 C 372 C 373 C 374 C 375 C 376 C 377 C 378 C 379 C 380 C 381 C 382 C 383 C 384 C 385 C 386 C 387 C 388 C 389 C 390 C 391 C 392 C 393 C 394 C 395 C 396 C 397 C 398 C 399 C 400 C 401 C 402 C Mono S-108 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-409 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-409 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-405 J-404 J-403 J-402 J-401 J-400 J-408 J-407 J-406 J-407 J-406 J-405 J-405 J-405 J-405 J-405 J-405 J-405 J-405 J-405 J- Mon: S-108 S -1. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Low S-1. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - High S-1. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Balance Treble Bass Binance

Displayplatte CR 1730 / Display board CR 1730 / Plaque d'image CR 1730
B

TR708 (FM1) R728 C731 (BP1) TR705 R727 TR704 R722 R736 B725 R726 TR706 R739 R738 TR707 J709 R729 D701 R744 R724 R720 R705 R704 R703 R702 R701 R706 R735 R734 R731 R730 R733 C734 T 5 3IC 703 J712 LB 1246 J713 8 J714 R716 R715 R714 R712 R713 C737 CT35 (EMS) VIR703 X 701 Z0 J706 15 J705 10 CTO8 CTO7 J717 LC 7285 25 30 35 40 #704 20 25 30 36 (1 2 3 ⊕ 4 5 6 7 G P702 EM IN 4 C704 R702 IC 701 SP8629 R705 D704 R745 C78 C718 D705 J719

Pos.	Art.-Nr.Part.No.Référ.	StckQty.ndp.	Bezeichnung	Description	Designation
1	266 885	1	Abdeckblech	Top cover plate	Tôle de recouvrement
2	266 886	4	Fuß	Base	Socle
3	266 887	1	Tuningknopf	Tuning knob	Bouton (Tuning)
4	266 888	1	Volumeknopf	Volume knob	Bouton (Volume)
5	266 889	3	Klangstellerknopf	Tone control knob	Bouton (Bass, Treble, Balance)
6	266 890	1	Selectionknopf	Selection knob	Bouton (Selection)
7	266 891	1	Powerknopf	Power knob	Bouton (Power)
8	266 892	1	Einstellschlüssel	Preset Wrench	Clef de réglage
9	267 095	1	Bodenblech	Bottom cover plate	Tôle de fond
13	267 096	1	Abdeckfilz	Felt	Feutre
16	267 097	1	Skalenblech	Scale Decoration plate	Tôle de Cadran
17	266 895	1	Skala	Scale	Cadran
20	266 963	1	Taste	Button	Touche
21	266 897	1	Führungsbuchse	Guide sleeve	Douille de quidage
22	266 898	1	Klemmbuchse	Clamp bush	Douille de serrage
23	267 122	1	Skalenfenster	Window	Fenêtre
24	267 098	1	Filz	Felt	Feutre
25	266 974	1	Frontblende kpl.	Front trim-plate	Panneau frontal
26	266 883	1	Seilrolle	Dial roll	Poulie
27	267 099	4	Seilrolle	Dial roll	Poulie
36	267 100	1	Kabelhalter	Holder	Support
39	237 548	1	Zugentlastung	Cable inlet	Passe-câble
43	267 121	1	Rückwand	Rear panel	Paroi arrière
45	266 918	1	Schwungmasse	Tuning	Volant
49	267 131	1	Isolierung	Insulation	Isolation
51	267 102	1	Plattenhalter	PWB Holder	Serrage
54	266 893	1	Zugfeder	Tension spring	Resort de traction
58	266 884	1	Drehkorolle	Variable capacitor roll	Roulleau de condensateur variable
60	267 128	2	Unterlagstück	Substratum	Couche inférieure
101	267 103	1	Zeiger kpl.	Pointer	Aiquille
102	266 977	1	Netztrafo kpl.	Transformer cpl.	Transformateur
103	266 903	1	Skalenlampe links	Lamp left	Lampe
104	266 904	1	Skalenlampe rechts	Lamp right	Lampe
105	243 750	1	Netzkabel	Mains lead	Câble secteur
107	267 104	1	Stummschalter	Muting switch	Interrupteur silencieux
108	267 105	1	Selectionschalter	Selection switch	Selecteur d'entrée
109	266 912	1	Ferritantenne kpl.	Antenne ferrite, completa	Ferrite rod antenna cpl.
110	266 913	1	Erdanschlußschraube	Ground terminal	Prise de terre
111	266 914	1	Antennenbuchse	Antenna bush	Prise d'antenne
112	266 915	1	Lautsprecheranschlußklemme	Loudspeaker jack	Réglette de bornes
113	267 127	1	Schalterverbindung	Remote Wire SWR	Connexion de l'interrupteur
114	266 976	1	LED-Einheit kpl.	LED panel compl.	Plaque de diodes lumineuses compl'
201	227 487	38	Sechskantblechschraube	Hexagon screw	Vis Parker hexagonale
202	218 055	4	Linsenblechschraube	Self tapping screw	Vis Parker à tête bombée
203	218 055	16	Linsenblechschraube	Self tapping screw	Vis Parker à tête bombée
204	210 475	13	Zyinderschraube	Machine screw	Vis à tête cylindrique
205	210 487	4	Zyinderschraube	Machine screw	Vis à tête cylindrique
208	267 106	1	Spezialschraube	Special screw	Vis à tête spéciale
209	210 387	2	Senkschraube	Sunk screw	Vis à tête fraisée
210	267 107	4	Spezialschraube	Special screw	Vis à tête spéciale
211	267 108	2	Linsenschraube	Machine screw	Vis à tête bombée
212	267 109	4	Spezialschraube	Special screw	Vis à tête spéciale
213	237 823	2	Zyinderschraube	Machine screw	Vis à tête cylindrique
216	267 129	1	Sechskantmutter	Hexagonal nut	Ecron à six pans
217	226 295	1	Scheibe	Washer	Rondelle
218	265 752	1	Bedienungsanleitung	Service Manual	Instructions de service
220	267 851	1	Verpackungskarton kpl.	Shipping carton	Carton d'emballage
			Eingangsplatte	Input Terminal PWB	Circuit d'entrée
250	266 989	1	Eingangsplatte kpl.	Input Terminal PWB compl.	Circuit d'entrée comp.
TR	1	266 947	2	2 SA 1127 S	2 SA 1127 S
TR	2	266 947	2	2 SA 1127 S	2 SA 1127 S
TR	3	266 938	2	2 SC 2634 S	2 SC 2634 S
TR	4	266 938	2	2 SC 2634 S	2 SC 2634 S
	260	266 990	1	DIN-Buchse	DIN Jack	Prise DIN à

Pos.		Art.-Nr.Part.No.Réfer.	StckQty.ndp.	Bezeichnung		Description		Designation
D 108		266 959	9	HV 80		HV 80		HV 80
D 109		266 959	9	HV 80		HV 80		HV 80
D 185		266 922	1	RD-6,2 EB		RD-6.2 EB		RD-6,2 EB
TR 101		266 937	1	2 SC 2634 M		2 SC 2634 M		2 SC 2634 M
TR 102		266 938	2	2 SC 2634 S		2 SC 2634 S		2 SC 2634 S
TR 181		266 939	2	2 SD 381 L		2 SD 381 L		2 SD 381 L
TR 182		266 938	1	2 SC 2634 S		2 SC 2634 S		2 SC 2634 S
IC 101		266 923	1	LA 1231 N		LA 1231 N		LA11231 N
IC 102		266 924	1	μPC-1161 C		μPC-1161 C		μPC-1161 C
IC 103		266 925	1	LA 1240		LA 1240		LA 1240
LF 101		266 928	2	Filter		Filter		Filtre
LF 102		266 928	2	Filter		Filter		Filtre
VR 101		266 969	1	Steller 50 kΩ		Variable Resistor 50 kΩ		Régulateur 50 kΩ
VR 102		266 970	1	Steller 5 kΩ		Variable Resistor 5 kΩ		Régulateur 5 kΩ
VR 103		266 971	1	Steller 200 kΩ		Variable Resistor 200 kΩ		Régulateur 200 kΩ
VC 101		266 940	1	Drehkondensator		Variable capacitor		Condensateur variable
TC 101		266 966	1	Trimmer 15 pF		Trimmer 15 pF		Trimmer 15 pF
TC 102		266 967	2	Trimmer 10 pF		Trimmer 10 pF		Trimmer 10 pF
TC 103		266 968	1	Trimmer 20 pF		Trimmer 20 pF		Trimmer 20 pF
TC 104		266 967	2	Trimmer 10 pF		Trimmer 10 pF		Trimmer 10 pF
T 101		266 932	1	FM DET Transformer		FM DET Transformer		FM DET Transformateur
T 102		266 931	1	FM DET Spule		FM DET Coil		FM DET bobine
T 103		266 933	1	Zwischenfrequenz 455 kHz		IF 455 kHz		MF 455 kHz
T 104		266 934	1	LW-Oszillator		LW-Oscillator		Oscillateur P O
T 105		266 935	1	AM-Oszillator		AM-Oscillator		AM-Oscillateur
T 106		266 936	1	Filter 455 kHz		Filter		Filtre
CF 101		266 920	1	Filter 10,7 MA		Filter 10.7 MA		Filtre 10,7 MA
CF 102		266 921	2	Filter 10,7 MA		Filter 10.7 MA		Filtre 10,7 MA
CF 103		266 921	2	Filter 10,7 MA		Filter 10.7 MA		Filtre 10,7 MA
L 101		266 926	1	Filter		Filter		Filtre
L 102		266 927	1	Filter		Filter 150 μH		Filtre 150 μH
271		266 984	1	UKW-Teil kpl.		VHF-section cpl.		Bloc UKW (OTC) au complet
				Tunerschalterplatte		Tuner switch PWB		Plaque de manoeuvre
280		266 985	1	Tunerschalterplatte kpl.		Tuner switch PWBcompl.		Plaque de manoeuvre
281		266 930	1	Tastenaggregat 4fach		Key boord		clavier
IC 104		231 688	1	μPC 741		μPC 741		μPC 741
D 110		266 959	2	HV 80		HV 80		HV 80
D 111		266 959	2	HV 80		HV 80		HV 80
				Verstärkerplatte		Main PWB		Etage amplificateur
290		266 983	1	Verstärkerplatte kpl.		Main PWB comp.		Etage amplificateur
D 201		266 960	3	SI 1 S-2473		SI 1 S-2473		SI 1 S-2473
D 202		266 960	3	SI 1 S-2473		SI 1 S-2473		SI 1S-2473
D 203		266 942	1	RD 7,5 EB		RD 7.5 EB		RD 75 EB
D 204		266 960	3	SI 1 S-2473		SI 1 S-2473		SI 1 S-2473
D 205		266 943	1	Zener RD 4,7 E		RD 4.7 E		RD 4,7 E
TR 201		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 202		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 203		266 944	2	2 SA-798 G		2 SA-798 G		2 SA-798 G
TR 204		266 944	2	2 SA-798 G		2 SA-798 G		2 SA-798 G
TR 205		263 149	3	2 SC 1845 E		2 SC-1845 E		2 SC-1845 E
TR 206		263 149	3	2 SC 1845 E		2 SC-1845 E		2 SC-1845 E
TR 207		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 208		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 209		266 945	2	2 SD-667 C		2 SD-667 C		2 SD-667 C
TR 210		266 945	2	2 SD-667 C		2 SD-667 C		2 SD-667 C
TR 211		266 946	2	2 SB 647 C		2 SB 647 C		2 SB-647 C
TR 212		266 946	2	2 SB 647 C		2 SB 647 C		2 SB-647 C
TR 213		266 910	2	2 SC 1827 O		2 SC 1827 O		2 SC 1827 O
TR 214		266 910	2	2 SC 1827 O		2 SC 1827 O		2 SC 1827 O
TR 215		266 911	2	2 SA-769 O		2 SA-769 O		2 SA0769 O
TR 216		266 911	2	2 SA-769 O		2 SA-769 O		2 SA-769 O
TR 217		263 149	3	2 SC 1845 E		2 SC 1845 E		2 SC 1845 E
TR 218		266 947	1	2 SA 1127 S		2 SA 1127 S		2 SA 1127 S
TR 301		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 302		266 938	6	2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR 501		266 948	1	2 SA 992 E		2 SA 992 E		2 SA 992 E
TR 502		263 149		2 SC 1845 E		2 SC 1845 E		2 SC 1845 E
VR 201		266 972	1	Steller 100 kΩ		Variable Resistor 100 kΩ		Régulateur 100 kΩ
VR 202		266 973	1	Steller 100 kΩ		Variable Resistor 100 kΩ		Régulateur 100 kΩ
VR 301		266 974	2	Steller 100 kΩ		Variable Resistor 100 kΩ		Régulateur 100 kΩ
VR 302		266 974	2	Steller 100 kΩ		Variable Resistor 100 kΩ		Régulateur 100 kΩ
R 231		267 119	4	Draht-W 0,33 Ω 2 W		Wire Resistor 0.33 Ω 2 W		Bobinée 0,33 Ω 2 W
R 232		267 119	4	Draht-W 0,33 Ω 2 W		Wire Resistor 0.33 Ω 2 W		Bobinée 0,33 Ω 2 W
Pos.		Art.-Nr.Part.No.Référ.	StckQty.ndp.	Bezeichnung		Description		Designation
R	233	267 119	4	Draht-W	0,33 Ω 2 W	Wire Resistor	0.33 Ω 2 W	Bobinée	0,33 Ω 2 W
R	234	267 119	4	Draht-W	0,33 Ω 2 W	Wire Resistor	0.33 Ω 2 W	Bobinée	0,33 Ω 2 W
FU	201	267 120	2	G-Schmelzeinsatz	2.5 AT	Fuse	2.5 AT	Fusible G	2,5 AT
FU	202	267 120	2	G-Schmelzeinsatz	2.5 AT	Fuse	2.5 AT	Fusible G	2,5 AT
	291	266 941	1	Tastenaggregat	2fach	Key board		Clavier
	292	266 981	1	Kopfhörerbuchsenplatte		Headphone board		Prise de casque
				Netzplatte		Power board		Plaque secteur
	300	266 978	1	Netzplatte kpl.		Power board compl.		Plaque secteur compl.
	301	266 979	1	Netzschalter		Power switch		Interrupteur secteur
D	501	265 531	1		S 4 VB 10		S 4 VB 10		S 4 VB 10
D	502	266 949	2		DS 135-E		DS 135-E		DS 135-E
D	503	266 949	2		DS 135-E		DS 135-E		DS 135-E
D	512	266 950	1		RD 12 EB		RD 12 EB		RD 12 EB
D	701	266 951	1		RD 15 EC		RD 15 EC		RD 15 EC
TR	701	266 938	3		2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR	702	266 947	1		2 SA-1127 S		2 SA-1127 S		2 SA-1127 S
TR	703	266 938	3		2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
TR	704	266 938	3		2 SC-2634 S		2 SC-2634 S		2 SC-2634 S
IC	501	266 953	1		μPC 574 J		μPC 574 J		μPC 574 J
IC	701	266 954	1		AN 6552		AN 6552		AN 6552
IC	702	231 688	1		μPC 741		μPC 741		μPC 741
IC	703	266 955	1		LB 1426		LB 1426		LB 1426
C	506	269 158	2	Elyt	4700 μF/35 V		4700 μF/35 V		4700 μF/35 V
C	507	269 158	2	Elyt	4700 μF/35 V		4700 μF/35 V		4700 μF/35 V
VR	701	267 125	1	Steller	5 kΩ	Variable Resistor	5 kΩ	Régulateur	5 kΩ
VR	702	266 969	1	Steller	50 kΩ	Variable Resistor	50 kΩ	Régulateur	50 kΩ
VR	703	267 126	1	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
FU	501	209 711	2	G-Schmelzeinsatz	1,25 AT	G-Fuse	1.25 AT	Fusible	1,25 AT
FU	502	209 711	2	G-Schmelzeinsatz	1,25 AT	G-Fuse	1.25 AT	Fusible	1,25 AT
FU	503	209 698	1	G-Schmelzeinsatz	500 mAT	G-Fuse	500 mAT	Fusible	500 mA T
				Festsenderspeicherplatte		Memory plate		Dispositif de mémoire
	310	266 988	1	Festsenderspeicherplatte		Memory plate		Dispositif de mémoire
VR	601	267 123	1	Steller	10 kΩ	Variable Resistor	10 kΩ	Régulateur	10 kΩ
VR	603	266 970	1	Steller	5 kΩ	Variable Resistor	5 kΩ	Régulateur	5 kΩ
VR	604	267 124	1	Steller	1 kΩ	Variable Resistor	1 kΩ	Régualteur	1 kΩ
VR	605	266 958	5	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
VR	606	266 958	5	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
VR	607	266 958	5	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
VR	608	266 958	5	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
VR	609	266 958	5	Steller	100 kΩ	Variable Resistor	100 kΩ	Régulateur	100 kΩ
	311	266 957	1	6 fach-Taste		Key board		Clavier

Exploded view diagram of a device with numbered components, likely an electronic or mechanical assembly.

Exploded view diagram of a computer motherboard with numbered components and labeled parts

Electrical circuit board layout with labeled components and traces, including resistors, capacitors, inductors, and switches.

Symtom: Whistling sound within the frequency range 90 to 93 MHz.

Cause: Influence of the FM-reception by means of the AM-oscillator.

Remedy: Disconnection of the feed wire P 106-2 / P 704-3 via the FM-switch, see modification below.

S 102-1 J124 S 102-3 MW Muting S 102-X FM AFC MUT LW M S 102-3 S 102-5 J123 J122 R170 R169 R168 R167 #111 #110 #110 #109