DC-7800RS (ZX-725)
DC-8500RS (ZX-726)
JAN. 1997
R
(without price)
CONTENTS
SPECIFICATIONS .............................................................................................................. 1
OPERATION CHECK ......................................................................................................... 2
DATA TRANSFER .............................................................................................................. 3
TROUBLESHOOTING ........................................................................................................ 4
SCHEMATIC DIAGRAMS .................................................................................................. 5
PARTS LIST ....................................................................................................................... 7
EXPLODED VIEW .............................................................................................................. 8
-- 1 --
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
-- 2 --
OPERATION CHECK
Note: Before performing the operation, save the data to another unit referring "DATA TRANSFER"
on page 3.
MODE
No.
1
2
3
4
5
KEY
While pushing down the RE-
SET button, press
then
release the RESET button.
Press
for about 1 sec-
ond.
Press
for about 1 sec-
ond.
Press
for about 1 sec-
ond.
DC-8500RS: Press
for
about 1 sec-
ond.
DC-7800RS: Press RESET
button.
DISPLAY
NOTE
The unit emits a buzz.
RESET button is located
on the back of the unit.
If the unit is faulty, LCD
indicates "NG" instead
of "OK".
DC-7800RS
DC-8500RS
-- 3 --
SCLK_
GND
SOUT
SIN
DATA TRANSFER
The DC-7800RS/8500RS can transfer the stored data to another DC-7800RS/8500RS.
Note: Before connecting wires, be sure to reset the Back up unit.
1. Remove the BATT 2 battery cover.
2. Connect 4 terminals on the PCB with wires as shown in the figure below.
User's unit
Back up unit
RESET
BATT 1
BATT 2
RESET
BATT 1
BATT 2
Wiring
GND
GND
SCLK_
SCLK_
SIN
SIN
SOUT
SOUT