Lexmark T620 Service Manual - Page 80
Action, system board
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4069-5XX/7XX FRU 6 LVPS 7 System Board Action Remove the LVPS from the printer. CAUTION: Before making any measurements on the LVPS output connector (CN3), observe all necessary safety precautions before applying AC power. Measure the voltage on CN3-1, 2, 10 or 11. The voltage measures approximately +5V dc. If incorrect replace the LVPS. Turn the printer off and disconnect all the cables from the system board. Check for +5V dc at the system board test point. If incorrect replace the FRU in the order shown. interconnect board system board If correct, turn the printer off and reconnect one cable at a time until you find the defective assembly. Service Tip: A short or low resistance load that is attached to the system board can pull the +5V dc supply down to approximately 0 V dc. Check for burn marks or other signs of damage to the system board. 2-52 Service Manual