Lexmark T632 Service Manual - Page 113
Print quality-all black photoconductor drum.
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4060-xxx Measure all voltages from the connector to printer ground. All voltages measured during the print cycle are measured with the controller board removed while running the print test. Print quality-all black page Service tip: An all black page is generally caused by a problem in the high voltage system or an incorrect high voltage in the printing process resulting in toner development on the entire photoconductor drum. FRU 1 High voltage contacts 2 Charge roll conductive bushing 3 HVPS 4 HVPS cable (part of front harness cable) System board Action Check the high voltage contacts on the right side frame to ensure they fit securely and are not pitted, contaminated, or damaged. If incorrect, replace the contact with one from the HV contact kit. Screws are included to attach the contacts to the right side frame in the HV contact kit. Make sure the charge roll bushing is correctly installed in the right charge roll arm. Check the voltages on J22-1 thru J22-8. If incorrect, replace the system board. Check the continuity of the HVPS cable. If incorrect, replace the cable assembly. If correct, replace the system board. Print quality-blank page. FRU 1 Print cartridge 2 High voltage contact 3 HVPS 4 Front cable harness HVPS section 5 Printhead assembly Action Check the print cartridge for damage, especially the PC drum contact on the cartridge. Check the PC drum contact on the right side frame for damage, PC drum contact wear or contamination. If the contact is bent or damaged, replace the contact. Note: Inspect the HVPS PC drum contact on the board for damage or contamination. Check the fuse on the HVPS. If open, replace the HVPS. Check the voltages at J22 on the system board. Measure the following voltages from connector J22 to printer ground: • Printer Idle J22-5 measures +24 V dc • Printer Printing J22-5 measures +24 V dc If the voltages at J10-5 are incorrect, replace the system board. Check the front cable harness at J22 on the system board and at CN1 on the HVPS to make sure the harness is connected properly. If connected properly, check the continuity of the cable harness. If there is no continuity, replace the front cable harness. Generally a 93x service error is posted if the printhead assembly fails and the printer does not give a blank copy symptom. The printhead used in the printer does not have a mechanical shutter as previous laser printers. The printer is interlocked through the front top cover interlock switch. Diagnostic information 2-79