EC505 - Calculator AURORA - Free user manual and instructions

Brand	Aurora
Model	EC505
Product Type	Calculator
Display	8-digit LCD
Dimensions	Approx. 10 x 6 x 1 cm
Weight	Approx. 50 g
Power Source	1 x LR54 battery
Functions	Basic arithmetic, percentage, square root, memory
Auto Power Off	Yes, after approx. 7 minutes
Keyboard	Plastic keys, tactile feedback
Case Material	Plastic
Color	Black/white (typical)
Cleaning	Wipe with a soft, dry cloth
Safety	Keep away from water and extreme temperatures
Battery Replacement	Easy access via sliding cover
Spare Parts Availability	Battery available at electronics stores
Repairability	Not user-serviceable beyond battery replacement
Included Accessories	None
Warranty	Standard 1 year (check retailer)

Frequently Asked Questions - EC505 AURORA

How do I turn on the Aurora EC505 calculator?

Press the ON/C button to turn on the calculator. It will automatically power off after a period of inactivity.

What type of battery does the EC505 use and how do I replace it?

It uses one LR54 button cell battery. Slide the battery cover on the back to open, replace the battery with the correct polarity, and close the cover.

How do I perform a basic calculation like addition?

Enter the first number, press +, enter the second number, then press = to see the result.

What does the 'MU' button do?

The MU button is used for markup calculations. For example, to calculate a 20% markup on 100, enter 100, press MU, enter 20, then press =.

How can I clear a wrong entry?

Press CE (Clear Entry) to clear the last number entered, or press ON/C to reset the current calculation.

Why is my calculator not turning on?

Ensure the battery is installed correctly with the + side up. If the battery is dead, replace it with a new LR54 battery.

How do I calculate a percentage?

To find 10% of 200, enter 200, press ×, enter 10, then press %. The result will be 20.

What should I do if the display shows a faint or flickering numbers?

This usually indicates a low battery. Replace the battery with a fresh LR54 cell.

Can I use the calculator in direct sunlight?

The LCD display may become hard to read in very bright light. Use in a shaded area for best visibility.

How do I clean the calculator?

Wipe the exterior with a soft, dry cloth. Do not use water, solvents, or abrasive cleaners.

USER MANUAL EC505 AURORA

Multi Function Calculator

12-Digit

EC505 / EC707

Solar Only Power

This calculator is battery free and uses solar power only. Please use the calculator in good lighting conditions. If the light source is not sufficient the display will fade.

Auto Power Off

If the calculator is not used for a period of 5-12 minutes, the unit will automatically switch off.

Turning On

Please press the "ON/AC" key first to turn the calculator on & clear all previous entries.

Key Function:

OFF.... Turns the calculator off

C/CE .... Clear entry

ON/AC ...... Turns the calculator on, and clear all entries and memory

+ Addition Key

- Subtraction Key

÷ Division Key

× …… Multiplication Key

= ...... Equal Key

0\~9/00 Number Key

• Decimal Key

+/- Symbol Key

→ Backspace Key

M+/M-/MRC .... Memory Operation Key

COST ...... Function Key "Cost"

SELL ...... Function Key "SELL"

MARGIN …… Function key "MARGIN"

Calculation Examples:

Basic calculation

Example	Operation	Display
23+203-56=	23+203-56=	170.
562×(38-96)=	38-96×562=	-32596.
(23×6+78)+2.3-89=	23×6+78+2.3-89=	4.9130434782
1234567×9876543=	1234567×9876543=	12.1932540618
	C/CE	12.1932540618
	C/CE or ON/AC	0.

□ Constant calculation

Example	Operation	Display
2+3=5	2+3=	5.
4+3=7	4=	7.
2-3=-1	2-3=	-1.
4-3=1	4=	1.
2×3=6	2×3=	6.
2×4=8	4=	8.
2+4=0.5	2+4=	0.5
3+4=0.75	3=	0.75

Memory calculation

Example	Operation	Display
2×3=6	2×3M+	MEMORY 6.
- ) 3×4=12	3×4M-	MEMORY 12.
+) 4×5=20	4×5M+	MEMORY 20.
14	MRC	MEMORY 14.
	MRC	14.

□ COST, SELL, MARGIN Function

To find the cost price if the sell price = 200 and the margin is 6%

Example	Operation	Display
Sell = 200 Margin = 6% Cost =?	200 [SELL] 6 [MARGIN]	COST 188.

To find the margin if the cost is 60 and the sell price is 100

Example	Operation	Display
Cost=60 Sell =100 Margin=?	60 [COST] 100 [SELL]	MARGIN% 40.

To find the sell price if cost price = 200 and the margin is 10%

Example	Operation	Display
Cost = 200 Margin = 10% Sell=?	200 [COST] 10 [MARGIN]	SELL 222.222222222

Decimal Selector & Rounding Operation

Example	Decimal	Round	Operation	Display
			C/CE	0.
5 ÷ 3 = 1.66666666666	F	5/4	5 ÷ 3 =	1.66666666666
5 ÷ 3 = 1.66	2	↓	5 ÷ 3 =	1.66
5 ÷ 3 = 1.67	2	5/4	5 ÷ 3 =	1.67
5 ÷ 3 = 1.67	2	↑	5 ÷ 3 =	1.67
4 ÷ 3 = 1.33333333333	F	5/4	4 ÷ 3 =	1.33333333333
4 ÷ 3 = 1.3333	4	↓	4 ÷ 3 =	1.3333
4 ÷ 3 = 1.3333	4	5/4	4 ÷ 3 =	1.3333
4 ÷ 3 = 1.3334	4	↑	4 ÷ 3 =	1.3334
2 + 3 = 0.05	A	↓	2 + 3 =	0.05
5 - 3 = 0.02	A	↓	5 - 3 =	0.02
5 ÷ 3 = 1.66	A	↓	5 ÷ 3 =	1.66
5 ÷ 3 = 1.67	A	5/4	5 ÷ 3 =	1.67
4 ÷ 3 = 1.34	A	↑	4 ÷ 3 =	1.34
2 × 3 = 6.00	A	↑	2 × 3 =	6.00

Producer

Aurora Electronics (UK) LTD. Unit 1.4.2 China Industrial Fe

Unit 1 & 2 Shires Industrial Estate Lichfield, Staffordshire, WS14 9AZ, U.K.

9219472