Lexmark T620 Service Manual - Page 144
System Board HVPS, Printer Printing
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4069-5XX/7XX FRU 4 System Board HVPS Connector Action Check the following voltages at J25 on the system board. Measure the voltages from J25 to printer ground. Printer Idle J25-1 approximately 0 V dc J25-2 approximately 4 V dc J25-4 approximately 0 V dc Printer Printing J25-1 varies 0 V dc to +5 V dc J25-2 varies 0 V dc to +4 V dc J25-4 varies 0 V dc to +1.9 V dc If J25-1 voltage is incorrect, check the continuity of the front harness cable (J25-1 line). If there is no continuity, replace the harness cable. If there is continuity, replace the HVPS. If this does not correct the problem, replace the system board. If J25-2 voltage is incorrect or if the voltage remains at 0 V dc, check the continuity of the front harness cable (J25-2 line). If there is no continuity, replace the harness cable. If there is continuity, replace the HVPS. If this does not correct the problem, replace the system board. If J25-4 voltage is incorrect, check the front harness cable (J25-4 line). If there is not continuity, replace the harness cable. If correct, replace the system board. if this does not correct the problem, replace the HVPS. 2-116 Service Manual