HP LaserJet Enterprise 600 Service Manual - Page 220
Power subsystem, Power-on checks, Overview
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Power subsystem Power-on checks The basic product functions should start up as soon as the product is plugged into an electrical receptacle and the power button is pushed to the on position. Overview Turn on the product power. If the control-panel display remains blank, random patterns appear, or asterisks remain on the display, perform power-on checks to locate the cause of the problem. NOTE: It might take the control panel 10 to 20 seconds to illuminate when the product power is turned on. During normal product operation, the left rear cooling fan begins to spin briefly after the product power is turned on. Place your hand over the holes in the left-side cover. If the fan is operating, you will feel a slight vibration and feel air passing into the product. You can also lean close to the product and hear the fan operating. When this fan is operational, the dc side of the power supply is functioning correctly. After the fan is operating, the main motor turns on (unless the top cover is open, a jam condition is sensed, or the paper path sensor is blocked). You should be able to visually and audibly determine if the main motor is turned on. If the fan and main motor are operating correctly, the next troubleshooting step is to separate print engine, formatter, and control-panel problems. Perform an engine test (see Engine test button on page 204). If the formatter is damaged, it might interfere with the engine test. If the engine test page does not print, try removing the formatter and then performing the engine test again. If the engine test is then successful, the problem is almost certainly with the formatter, the control panel, or the cable that connects them. If the control panel is blank when you turn on the product, check the following items. 1. Make sure that the product is plugged into an active electrical outlet receptacle that delivers the correct voltage. 2. Make sure that the on/off button is in the on position. 3. Make sure that the fan runs briefly, which indicates that the power supply is operational. 4. Make sure that the control-panel display wire-harness is connected to connector J70 of the DC controller PCA. 5. Make sure that the formatter is seated and operating correctly. NOTE: If the control-panel display is blank, but the main cooling fan runs briefly after the product power is turned on, try printing an engine test page to determine whether the problem is with the control-panel display, formatter, or other components. See Engine test button on page 204. If the main cooling fan is not operating, replace the power-supply assembly. See High voltage power supply on page 148. NOTE: It is important to have the control panel functional as soon as possible in the troubleshooting process so that the control-panel display can be used to help locate errors. 196 Chapter 3 Solve problems ENWW