e-STUDIO2820C/2830C/3520C/3530C/4520C © 2008 TOSHIBA TEC CORPORATION All rights reserved
ERROR CODE AND TROUBLESHOOTING
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[CF90] Laser optical unit shutter abnormality
Take off the developer unit so that the laser shutter can be seen.
Clean around the laser shutter if the toner or developer material is spilled over.
Is there any abnormality such as warp on the main charger cleaner rod?
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YES Replace the main charger cleaner rod.
NO
Does the harness of EPU (Auto toner sensor) contact with the shutter?
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YES Correct the wiring.
NO
Is the shutter motor working? (Perform the output check: 03-417)
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NO 1. Check if the connector of the exit shutter motor is disconnected.
2. Check if the connector CN359 on the LGC board is disconnected.
3. Check if the connector pins are disconnected or the harnesses are open cir-
cuited.
4. Check if the conductor pattern on the LGC board is short circuited or open
circuited.
5. Replace the shutter motor.
6. Replace the LGC board.
YES
Is the laser shutter working?
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NO 1. Check and correct the mechanism of the laser shutter.
2. Check if the shutter plate is assembled correctly.
YES
Is the shutter motor assembled correctly?
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NO 1. Check if the positioning of the gear and the rack is correct.
2. Check if the distance between the gear and the rack is proper.
3. Check if the worm gear and the drive gear are engaging properly.
4. Check if grease is applied to the worm gear and the drive gear.
YES
Is the laser shutter able to be opened/closed repeatedly?
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NO 1. Check if the connector of the shutter status detection sensor (S20) is dis-
connected.
2. Check if the connector CN359 on the LGC board is disconnected.
3. Check if the connector pins are disconnected or the harnesses are open cir-
cuited.
4. Check if the conductor pattern on the LGC board is short circuited or open
circuited.
5. Replace the shutter status detection sensor.
6. Replace the LGC board.
YES
Check if the conductor pattern on the LGC board is short circuited or open circuited.
Replace the LGC board.
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