Sharp SF-2014 Service Manual page 122

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(8) Toner supply motor drive circuit
IC104 is the motor control IC which drives the toner supply motor with
the pulse signals (TMa, TMb) outputted from the I/O chip.
+24V
IC104
C102
+
2
6
+5V
TMa
9
8
10UF35V
IN1
TMb
1
7
TMa
IN2
I/O
3
TMb
5
GND
R208
R209
TA7291S
47KJ
47KJ
M
Internal circuit
+5V
+24V
2
8
6
+24V
TMa
REG
7
M
Protection
3
circuit
TMb
(Heat insulated)
9
1
5
GND
TMa
TMb
Truth value table
Input
Output
Mode
TMa
TMb
TMa
TMb
L
L
Stop
Å
Å
H
L
H
L
CW/CCW
L
H
L
H
CCW/CW
H
H
L
L
Brake
Å : High impedance
(9) Reset IC (IC113)
1
Outline
The M51953 BL is the most suitable semiconductor IC for detecting
the power voltage to reset the CPU and every type of logic circuit. It is
equipped with the delay circuit to provide delay time just by adding an
external capacitor.
5
Output
4
Delay capacity
3
GND
2
NC
Power
1
External view 5P5
12 – 8
2
Operation
After td (= 30msec) from when the voltage exceeds 4.25V after power
rising, the output becomes HIGH.
"td" is set by the external capacitor.
Power
5µA
reference
R1
Output
-
-
R2
+
1.25V
GND
Delay capacity
4.25V
0.65V
t
H
ta
ta
L
t
Output not constant
ta = 30m sec

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