Gestetner B147, Service Manual

Page: 220 / 1081

SC TABLE
B147/B149/B190 4-18 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 240 LD over
240-001: Y
240-002: M
240-003: C
240-004: K
The power supply for the LD
unit exceeds 67 mA.
• LD worn out
(current/light output
characteristics have
changed.)
• LD broken (short
circuit)
1. Turn the main switch off and on.
2. Replace the laser optics housing unit. D
SC 260 LD HP sensor
not switched on
(for K only)
During homing, it takes more
than five seconds to switch the
HP sensor on (the sensor
actuator does not cover the
sensor). • Defective motor
•
Defective sensor
•
Mechanical problem
when switching the
actuator
• Brown fuse (FU81) on
the Power supply unit
1. Turn the main switch off and on.
2. Check the sensor actuator position of
the LD positioning motor.
3. Replace the LD positioning motor.
4. Replace the LD home position
sensor.
5. Check and/or replace the PSU.
D
SC 261 LD HP sensor
not switched off
(for K only)
After the laser beam pitch was
changed, it takes more than
five seconds for the HP sensor
to switch off. •
Defective motor
•
Defective sensor
• Mechanical problem
when switching the
actuator
•
Brown fuse (FU81) on
the Power supply unit
1. Turn the main switch off and on.
2. Check the sensor actuator position of
the LD positioning motor.
3. Replace the LD positioning motor.
4. Replace the LD home position
sensor.
5. Check and/or replace the PSU.
D