Service manual

FO-IS125N
5 – 29
[7] Troubleshooting
1. Printer error table
2. Troubleshooting of control PWB
LASER ERROR
The Fax Engine detected the optical unit (LSU) error.
THERMISTER ERROR
Thermistor error was detected.
HEATER HIGH High temperature error was detected.
HEATER LOW Low temperature error was detected.
Q301
LSU Error
LASER ERROR
Optical Error
(Laser)
+5V-Regulator Circuit
fail
Control signal fail
CNPM
(Connector)
Q300 (Transistor)
IC301
R313
IC100 (Fax Engine)
F300 (fuse)
C305,C306,C307
D300 (Diode)
IC302
(Regulator IC)
R312
Scanning-motor Error
CNLSR
(Connector)
R,C around above
ICs
IC100
(Fax Engine)
IC300, IC301
1
A