Sharp AM-900 Service Manual page 99

3. Troubleshooting of control PWB
Display Error
on LCD
A
2
SYSTEM ERROR
B
1
SYSTEM ERROR
Pickup Motor Error
[P1]
A
LSU Error
[P2]
H/V-unit control-circuit
Error
Not rotate
or shortage torque
Not detect roller sensor
Scanning-motor Error IC21 (Printer CPU)
(Connector)
Q14(Transistor)
Q15(Transistor)
Optical Error
+5V-Regulator Circuit
(Laser)
fail
Control signal fail
IC22
(Regulator IC)
IC23,IC25,
IC28,IC29
R,C around above
ICs
5 – 26
IC21 (Printer CPU)
IC32 (driver)
R265~R268
F6 (fuse)
D15 (zener diode)
R331~R334
IC21 (Printer CPU)
CNROLSNS
(Connector)
C,R on route
of CNROLSNS~IC21
CNPM
R301
IC22
(Regulator IC)
F5 (fuse)
R277
D14 (Diode)
C202,C206,C207
IC22
(Regulator IC)
CNLSR
(Connector)
IC25~ IC27
R,C around above
ICs
AM-900U