HP LaserJet 4 Service Manual - Page 175

High Voltage Power Supply (HVPS) Removal Figure 6-19 HVPS Screws (2) and Latches (2) (Bottom View) 1 Remove the Toner Cartridge and PC tray. 2 Lay the printer on its left side. (Place a cloth under the printer to prevent marking the cover.) 3 Remove the (2) screws that hold the HVPS in place (see Figure 6-19, callout 1). 4 Release the (2) latches that hold the High Voltage Power Supply (see Figure 6-19, callout 2). 5 Pull the HVPS straight away from the printer to clear its locator pins and to prevent damage to the HVPS connectors. 6 Remove the HVPS from its housing by releasing the (4) retaining clips that hold the PCA in place. Note Run a printing self-test after replacing the high voltage power supply. If the printer prints solid black pages, the HVPS may be seated incorrectly. Repeat the installation procedure, being careful to align the high voltage connectors. Removal and Replacement 6-21