Casio DC-7800RS, DC-8500RS Service Manual

DC-7800RS (ZX-725)
DC-8500RS (ZX-726)

JAN. 1997

(without price)

R

CONTENTS

SPECIFICATIONS .............................................................................................................. 1

OPERATION CHECK ......................................................................................................... 2

DATA TRANSFER.............................................................................................................. 3

TROUBLESHOOTING........................................................................................................ 4

SCHEMATIC DIAGRAMS .................................................................................................. 5

PARTS LIST ....................................................................................................................... 7

EXPLODED VIEW .............................................................................................................. 8

SPECIFICATIONS

Display: Liquid crystal display
Power supply: Two lithium batteries (CR2032)
Power consumption: 0.1 W
Current consumption: DC-7800RS When AC key is pressed; Max. 18.7 µA. Typ. 9.5 µA

While Power OFF; Max. 14.7 µA
While buzzing; Max. 765 µA
When backlighting; Max. 16,500 µA

DC-8500RS When AC key is pressed; Max. 20.7 µA. Typ. 10.5 µA

While Power OFF; Max. 16.7 µA
While buzzing; Max. 767 µA
When backlighting; Max. 16,500 µA

Battery life: Approx. 1 year (one hour operation per day with two backlight opera-

tions and one daily alarm operation)

Auto power off: Approx. 6 minutes after last key operation
Ambient temperature range: 0 °C ~ 40 °C (32 °F ~ 104 °F)

Dimensions: 15.3 (H) × 134 (W) × 92 (D) mm .........Folded

(5/8" (H) × 5 1/4" (W) × 3 5/8" (D))

10.9 (H) × 134 (W) × 180 (D) mm .......Unfolded

(3/8" (H) × 5 1/4" (W) × 7 1/8" (D))

Weight: DC-7800RS; 121.5 g (4.3 oz)/DC-8500RS; 122 g (4.3 oz) including

batteries

— 1 —

OPERATION CHECK

Note: Before performing the operation, save the data to another unit referring “DATA TRANSFER”

on page 3.

No.

MODE

KEY

DISPLAY NOTE

While pushing down the RE­SET button, press G then
release the RESET button.

1

Press for about 1 sec­ond.

2

Press for about 1 sec­ond.

3

The unit emits a buzz.
RESET button is located
on the back of the unit.

Press for about 1 sec­ond.

DC-8500RS

4

DC-7800RS

DC-8500RS: Press for

about 1 sec-

5

DC-7800RS: Press RESET

ond.
button.

If the unit is faulty, LCD
indicates “NG” instead
of “OK”.

— 2 —