HP 5100 Service Manual - Page 191

Table 30. No ac power Cause Action No correct voltage present Plug the power cord into another ac circuit outlet. at the outlet. Inform the customer that the correct line voltage is not available at the outlet. The power cord is not firmly Insert the plug on the power cord firmly. plugged into the printer and the outlet. Blown fuse. 1. Check the fuses-F1 and F2-on the power supply. 2. Replace the fuses if necessary. Defective power switch. Remove the dc controller and power supply. Measure the resistance between the two terminals of the power switch (SW101) by applying the tester probes to the terminals. The resistance must be low (under 1 KΩ) when the power is turned ON, and high (over 6 MΩ) when the switch is turned OFF. If resistance does not meet these thresholds, replace the printer power supply. Defective ac receptacle or Check the printer's ac receptacle and wiring for the ac power line. If no printer power supply. problem is found, replace the power supply. Table 31. No dc power Cause Action No ac power is supplied. Check the ac power supply (see table 30). The overcurrent/overvoltage If the problem is not rectified after the power switch is turned off and on detection circuit is activated. again, find the cause of activation of the overcurrent/overvoltage detection circuit in the power supply. Wait for more than two minutes before turning the printer back on. Blown fuse. 1. Check the fuses-F1 and F2-on the power supply. 2. Replace the fuses if necessary. Defective power supply unit. Replace the printer power supply. Q1860-90918 Chapter 7 Troubleshooting 189