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November 2003 © TOSHIBA TEC 5 - 81 e-STUDIO3511/4511 TROUBLESHOOTING
[CF50] Color auto-toner sensor abnormality
Are the connector of color auto-toner sensor, joint connector and connector CN356 on the LGC board
connected normally?
NO 1. Reconnect the connectors.
2. Correct or replace if the connector pins are disconnected or harnesses are open
circuited.
YES
Are the color auto-toner sensor and reference plate stained?
YES Clean them.
NO
Is the color auto-toner sensor shutter solenoid working normally?
(Perform the output check: 03-125/175)
NO 1. Check if the connectors or joint connectors of the color auto-toner sensor shutter
solenoid and color auto-toner sensor are disconnected.
2. Check if the connector CN356 on the LGC board is disconnected.
3. Check if the connector pins are disconnected or the harnesses are open circuited.
4. Check if the conductor pattern on the LGC board is short circuited or open
circuited.
5. Replace the color auto-toner sensor shutter solenoid.
6. Replace the LGC board.
YES
Is the color auto-toner sensor shutter closing position correct? (Perform the output check: 03-125/175)
NO Adjust the install position of solenoid so that the gap between the sensor holder and
stopper will be 1.0 mm when closing the shutter.
YES
1. Check if the conductor pattern on the LGC board is short circuited or open circuited.
2. Replace the LGC board.
3. Replace the reference plate and perform “Initialization of color auto-toner sensor light amount
correction target value (05-207)”.
4. Replace the color auto-toner sensor and perform “Enforced correction of color auto-toner sensor
light amount (05-208)”.