Sharp SF-2314 Service Manual

(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.
Internal circuit
Truth value table
Input Output
Mode
TMa TMb TMa TMb
LL
∞∞
Stop
H L H L CW/CCW
L H L H CCW/CW
H H L L Brake
∞
: 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.
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.
TMa
TMb
R208
47KJ
R209
47KJ
2
9
1
5
+5V
IC104
TA7291S
IN1
IN2
GND
6
8
7
3
M
+
C102
10UF35V
TMa
TMb
+24V
I/O
2 8
91 5
6
7
3
M
REG
GND
Protection
circuit
(Heat insulated)
+5V +24V
TMa
TMb
+24V
TMa
TMb
1
2
3
4
5
M51953 BL
External view 5P5
Power
NC
GND
Delay capacity
Output
R1
R2
1.25V
+
-
-
Power
5µA
reference
GND Delay capacity
Output
t
ta ta
H
L
Output not constant
ta = 30m sec
t
4.25V
0.65V
Power voltageOutput state
12 – 8

Sharp SF-2314 Specifications

General

Brand	Sharp
Model	SF-2314
Category	Copier
Language	English