Olivetti d-Copia 600, Service Manual

Page: 206 / 454

1-5-50
(3) Image is too light. 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.
Causes Check procedures/corrective measures
1. Insufficient toner.
If the display shows the message requesting toner replenishment,
replace the toner container.
2. Deteriorated toner.
Perform the drum refresh operation (see page 1-4-84).
3. The transfer voltage is not output properly.
A. The connector terminals of the transfer
high voltage PWB make poor contact.
Reinsert the connector. Also check for continuity within the connector
cable. If none, remedy or replace the cable.
B. Poor insertion transfer unit.
Reinstall the transfer unit.
C. Continuity malfunction inside the transfer
belt.
Check for continuity. If none, remedy or replace.
4. Defective developing bias output.
A. Defective engine PWB.
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.
5. Surface potential is high.
A. Poor installation of high voltage PWB.
Check the installation state of the high voltage PWB.
B. Defective 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