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(3) Image is too light.
Causes
1. Insufficient toner.
2. Deteriorated toner.
3. The transfer voltage is not output properly.
A. The connector terminals of the transfer
high voltage PWB make poor contact.
B. Poor insertion transfer unit.
C. Continuity malfunction inside the transfer
belt.
4. Defective developing bias output.
A. Defective engine PWB.
5. Surface potential is high.
A. Poor installation of high voltage PWB.
B. Defective high voltage PWB.
1-5-50
Causes
1. Insufficient toner.
2. Deteriorated toner.
3. The transfer voltage is not output properly.
4. Defective developing bias output.
5. Surface potential is high.
Check procedures/corrective measures
If the display shows the message requesting toner replenishment,
replace the toner container.
Perform the drum refresh operation (see page 1-4-84).
Reinsert the connector. Also check for continuity within the connector
cable. If none, remedy or replace the cable.
Reinstall the transfer unit.
Check for continuity. If none, remedy or replace.
Check if YC7-5 both or one side of YC7-6 on the engine PWB go low
when run maintenance item U101. If not, replace the engine PWB.
Check if 5 V DC is output from YC7-3 on the engine PWB when run main-
tenance item U101. If not, replace the engine PWB.
Check the installation state of the high voltage PWB.
If the grit output is zero when the high voltage PWB is installed securely,
replace the high voltage PWB.
Service Manual
Y104350-7
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