Lexmark T620 Service Manual - Page 93

4069-5XX/7XX FRU 2 Fan Assembly System Board Action Check to make sure the auxiliary fan cable is seated on connector J6 on the system board. If correct, check for +24 V dc on J6-1 on the system board. If incorrect, replace the system board. If correct, replace the cartridge fan. Note: When the printer is in warmup the voltage at J6-1 measures approximately +12 V dc. When the printer is running, the voltage measures approximately +24 V dc. Cold Fuser Service Check Error codes 920, 921, and 922 may display for a cold fuser failure. A 920 error caused by low line voltage can sometimes be cleared by turning the machine off and then on again. A 925 service error indicates the wrong fuser lamp is installed in the printer and does not match the one stored in the printer code. Note: If the correct lamp is installed and you still have 925 fuser errors, try the following: 1. The fuser may have reached standby temperature too quickly. Check the fuser assembly, system board or LVPS. 2. Ensure that the correct hot roll is installed. 3. Check the AC line voltage to ensure it is not above the maximum rating for the printer. Note: Make sure the fuser is correctly installed before proceeding with this service check. The fuser must be firmly seated in the two rear connectors. Both the right and left lock down screws must be tight. Service Tip: Set the Fuser Temperature to NORMAL before starting this service check. Diagnostic Information 2-65