Epson EPL-5900, Service Manual

Page: 106 / 181

EPSON EPL-5900/EPL-5900L Revision B
Troubleshooting Troubleshooting for Abnormal Operations 89
3.3 Troubleshooting for Abnormal Operations
3.3.1 Abnormal Laser
3.3.2 Abnormal Polygon Motor
3.3.3 Abnormal Main Motor
3.3.4 Abnormal Fusing
Table 3-4. Abnormal Laser
Cause Remedy
Abnormal laser diode Replace the print head unit. ( p.123)
Replace the Main Board Assy. ( p.120)
Table 3-5. Abnormal Polygon Motor
Cause Remedy
Abnormal Polygon Motor Replace the print head unit. ( p.123)
Replace the Main Board Assy. ( p.120)
Table 3-6. Abnormal Main Motor
Cause Remedy
Main Motor (M1) does not rotate. Replace the main motor (M1). ( p.132)
Replace the Main Board Assy. ( p.120)
Table 3-7. Abnormal Fusing
Step Check Item Remedy
1
†
Checking the temperature
• Is the fusing unit warmed-up?
Yes: Replace the
appropriate one of the
following parts:
• Thermistor
(TH1) ( p.129) or fuser
unit ( p.125)
• Main Board Assy
( p.120)
No : Go to Step 2
2
†
Continuity of the connector
• Is there continuity between Pin 1 and Pin 3 of the
connector of the fusing unit?
Yes: Replace the
appropriate one of the
following parts:
• Power supply unit
(PU1) ( p.130)
• Main Board Assy
( p.120)
No : Replace the fuser
unit ( p.125)
Or replace the heater
lamp (H1) or the
thermostat
(TS1).
( p.129)