Lexmark T620 Service Manual - Page 139

4069-5XX/7XX FRU 2 High Voltage Contact 3 HVPS 4 Front Cable Harness HVPS Section 5 Printhead Assembly Action 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 any signs of damage or contamination. Check the fuse on the HVPS. If open, replace the HVPS. Check the voltages at J25 on the system board. Measure the following voltages from connector J25 to printer ground: Printer Idle J25-5 measures +24 V dc Printer Printing J25-5 measures +24 V dc In the voltages at J25-5 are incorrect, replace the system board. Check the front cable harness at J25 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 2-111