HP LaserJet M9040/M9050 Service Manual - Page 314
Malfunction troubleshooting
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Malfunction troubleshooting Table 7-2 Malfunction troubleshooting Cause No AC power Defective power supply assembly The over-current/over-voltage detection circuit is activated. Defective power supply assembly Defective wiring, DC loads, or scanner controller PCA Solution ● Make sure that the wall receptacle has the appropriate voltage. ● If a power strip is being used, remove it, and plug the product directly into the wall receptacle. ● Make sure that the product is plugged into a dedicated circuit and that the circuit meets specifications. ● Make sure that the print engine power supply is functioning correctly. ● Replace the power supply assembly. Turn the product off, wait approximately two minutes, and then turn it on. If the problem persists, find the cause of the overcurrent/overvoltage detection circuit activation in the power supply assembly. Replace the power supply assembly. Turn the product off. Check the wiring ahead of the scanner controller PCA and the DC loads. If you discover the problem, replace the wiring and DC loads. If no problem exists, replace the scanner controller PCA. 296 Chapter 7 Solve problems ENWW
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