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June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TROUBLESHOOTING
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5
5.1.15 Laser optical unit related service call
[CA10] Polygonal motor abnormality
[CA20] H-Sync detection error
Is the polygonal motor rotating?
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NO Æ 1) Check if the connector CN342 on the LGC board is disconnected.
2) Check if the harness is open circuited or the connector pin is disconnected.
3) Check if the conductor pattern on the LGC board is short circuited or open
circuited.
4) Replace the laser optical unit.
5) Replace the LGC board.
YES
Is the printed image distorted?
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YES Æ 1) Check if the connector CN342 on the LGC board is almost disconnected.
2) Check if the harness is almost open circuited or the connector pin is almost
disconnected.
3) Check if the conductor pattern on the LGC board is short circuited or open
circuited.
4) Check if the laser unit cooling fan is stopped.
5) Check if the suction area of laser unit cooling fan is plugged up.
6) Replace the laser optical unit.
7) Replace the LGC board.
NO
1) Check if the conductor pattern on the LGC board is short circuited or open circuited.
2) Check if the units with high-voltage (developer unit, transfer belt unit and 2nd transfer roller
unit) are securely grounded.
3) Check if the bias supply joints of the units with high-voltage are securely connected or they
are not stained.
4) Check if the plate in paper transport system is securely grounded.
5) Check if the equipment is grounded.
6) Check if the laser unit cooling fan is stopped.
7) Check if the suction area of laser unit cooling fan is plugged up.
8) Replace the laser optical unit.
9) Replace the LGC board.
Is the cable (flexible flat type) between the connector (CN345) on the LGC board and connec-
tor (CN201) on the LDR board open circuited, broken or disconnected?
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YES Æ 1) Reconnect the cable.
2) Check if the connector on the LGC board hold the cable securely.
3) Replace the laser optical unit.
NO
1) Check if the units with high-voltage (developer unit, transfer belt unit and 2nd transfer roller
unit) are securely grounded.
2) Check if the bias supply joints of the units with high-voltage are securely connected or they
are not stained.
3) Check if the plate in paper transport system is securely grounded.
4) Check if the equipment is grounded.
5) Check if the conductor pattern is short circuited or open circuited.
6) Replace the LGC board.
7) Replace the laser optical unit.