Brother International HL-2400C Service Manual - Page 300

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 scanner unit. 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 scanner unit. 2) Replace the transfer solenoid 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 4.3.2 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.) VIII-55