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12V line
Power is ON
Voltage (V)
Power is OFF
Voltage (V)
5V line
Time
Time
Reset voltage
Reset voltage
12V line
5V line
12
6
0
12
6
0
0V
RESET
12V
Main
P.W.B.
+
R252
R284
R288
IC5(1/2)
R292
R286
R289
R285
C204
C226
C225
C215
C107
JW10
0V
0V
0V
0V
5V
0V
0V
48
62
2
8
1
3
Microcomputer
(AX-8T11)
HIC
Fig. 9-1
Fig. 9-2
Reset circuit performs initial setting of the microcomputer program before power is turned on.
Microcomputer resets program with reset voltage set to Lo, and program can be operated with Hi.
Fig. 9-1 shows the reset circuit and Fig. 9-2 shows waveform at each point when power is turned on and off.
When power is turned on, 12V line and 5V line voltages rise and 12V line voltage reaches 10.9V and reset voltage input to
pin of microcomputer is set to Hi.
Reset voltage will be hold " Hi " until the 12V line voltage drops to 9.90V even though the power shuts down.
9. Reset Circuit
+
-