Specifications

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VCOMP2
VCOMP1
VCOMP1
"H"
"L"
CR-2032 X 2
P7
BLI
ONMK
VCOMP2
VCOMP1
Power Supply Chip
VDD1
VDD2
Main batteries
SC371015FU
µPD3055GF002-2BA
C P U
Gate Array
µPD65005G-452-22
GND2
(Pin1)
(Pin19)
(Pin37)
(Pin27)
(Pin7)
(Pin79)
(Pin6)
GND1
(Pin22)
"H"
"L"
Less than about 4.4V
Batteries Voltage
Batteries Voltage
More than about 4.6V
VCOMP2
More than about 4.4V
Less than about 4.6V
(Pin32)
10-3.Battery voltage detection
The power supply IC chip SC371015FU has
two kind voltage detection circuit in it. Accord-
ing to the batteries input voltage, the detection
outputs V comp1 and V comp2 will change the
status as follow:
When CPU receive VCOMP2 detection signal, the machine shows "MAIN POWER SUPPLY
BATTERIES GETTING WEAK! REPLACE!" on the display. And when the batteries voltage is
weak more (approx. 4.53V), as the VCOMP1 detection signal becomes "L". The machine will
operate an auto power off operation.