HP LaserJet 5000 Service Manual - Page 230

Table 7-4. No DC Power Cause Action No AC power is supplied. Check the AC power supply. See table 7-3, "No AC Power," on page 7-8 The overcurrent/overvoltage detection circuit activated. If the problem is not rectified after the power switch is turned off and on 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 (F2) on the Power Supply. 2. Replace the fuses if necessary. Defective power supply unit Replace the power supply unit. Note Engine Test The engine test verifies that the print engine is functioning correctly. The Formatter PCA is completely bypassed during an engine test. This test is very useful for isolating printer problems. The engine test prints a full page of lines across the entire printable area, and is also useful for checking and adjusting registration. The engine test prints from the "Cold Reset Paper Tray" and can be activated with the Formatter PCA removed. The "Cold Reset Paper Tray" must be loaded with paper to perform an engine test. Also, ensure that the Toner Cartridge is installed in the printer. EN Troubleshooting the Printing System 7-9