(8) Toner supply motor drive circuit
The IC103 controls the toner supply motor. Pseudo-AC waveforms
are produced from the pulse signals (TMa, TMb) from the CPU to
drive the toner supply motor.
(9) Reset IC (IC102)
1. General
The reset IC (M51953 BL) is a semiconductor integrated circuit which
is most suitable to detect the power voltage and reset various types
of logic circuits including the CPU.
Since it includes the delay circuit, delay time is obtained simply by
adding an external capacitor.
Pin connection (Top view)
2. Operation
•
After turning on the power, and after td (30msec) time from when
the voltage exceeds 4.25V, the output becomes HIGH.
"td" is set by the external capacitor (C106).
Block diagram
TMa
TMb
R222
47KJ
R223
47KJ
2
9
1
5
+5V
IC103
TA7291S
IN1
IN2
GND
6
8
7
3
M
+
C102
10UF35V
TMa
TMb
CPU
24V
2
8
9
1
5
6
7
3
M
REG
GND
+5V
+24V
TMa
TMb
+24V
TMa
TMb
Internal circuit
Protection
circuit
(Heat insulation)
4 pin: NC
1
2
3
4
5
M
51953 BL
NC
Output
Delay capacity
GND
Power
External view 5PS
R1
R2
1.25V
+
-
-
5µA
C
Power
standard
GND
Delay capacity
Out
put
t
ta
ta
H
L
ta = 30m sec
t
4.25V
0.65V
Power vol
tage
O
utput state
Insufficient output
12 – 8
www.freeservicemanuals.info
1/11/16
Published in Heiloo, Holland.
