Brother HL-2600CN Series, Service Manual

Page: 345 / 385

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I-23 White Print
Phenomenon
A blank page (no print at all) is output or a specific color is missing (not printed) as shown
in
print sample (23) of Fig.8-2 .
Main Causes
1) Laser light path is blocked by paper or other material stuck at the opening of the
optical unit 2.
2) The transfer solenoid is broken (not functioning).
3) There is no belt bias voltage (CBV).
4) There is no output from the high voltage unit (HVU) due to breakdown.
Countermeasures
1) Confirm that there are no foreign objects stuck in the opening of the optical unit 2.
2) Replace the TR cam clutch 3 with a new one. (See Section 4.1.14 of Chapter VII .)
3) Replace the OPC belt cartridge with a new one. (See Section 2.1 of Chapter VI .)
4) Replace the high voltage unit with a new one. (See Section 4.3.6 of Chapter VII .)
I-24 Insufficient Fusing
Phenomenon
Printed image is partially missing as shown in print sample (24) of Fig.8-2 . This proves
that the fusing is insufficient.
Main Causes
1) Wrong selection of print media (label or envelope, etc.) at the Host (driver) side.
2) Recommended paper is not being used.
3) Double-feed paper.
4) Failure of the fusing unit.
Countermeasures
1) Adjust the mode of Host side to suit the print media in use.
2) Use the recommended paper.
3) Fan the paper before loading in the media cassette.
4) Replace the failed fusing unit with a new one. (See Section 2.2 of Chapter VI .)