Troubleshooting - Sharp FO IS125N - B/W Laser - All-in-One Service Manual

FO-IS125N

[7] Troubleshooting

1. Printer error table
LASER ERROR
THERMISTER ERROR
HEATER HIGH
HEATER LOW
2. Troubleshooting of control PWB
1
LASER ERROR
A
The Fax Engine detected the optical unit (LSU) error.
Thermistor error was detected.
High temperature error was detected.
Low temperature error was detected.
LSU Error Scanning-motor Error
Optical Error
(Laser)
5 – 29
IC100 (Fax Engine)
CNPM
(Connector)
Q300 (Transistor)
IC301
R313
IC302
+5V-Regulator Circuit
(Regulator IC)
fail
F300 (fuse)
R312
D300 (Diode)
C305,C306,C307
IC100
Control signal fail
(Fax Engine)
CNLSR
(Connector)
IC300, IC301
R,C around above
ICs
Q301