Xerox 4400DT Service Manual - Page 103
DC Power Loading, Perform, before starting this procedure.
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DC Power Loading Note: Perform "DC Power (LVPS)" before starting this procedure. Warning: AC input voltages can be lethal. Use extreme caution while checking the voltages on the LVPS. Disconnect the power cord while checking the continuity of fuses and while removing or reinstalling components. DC Power Loading Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Switch the printer power OFF. 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Disconnect the following from the LVPS: I P/J281 (Engine Logic Board) I P/J282 (Image Processor Board) I P/J283 (LVPS Fan) I Pn1 (5 VDC Power Supply) 4. Go on to step 2. 2 1. Switch printer power ON. Go to step 3. Replace the 2. Measure the voltage between P/J281 pin 7, and LVPS (RRP frame ground. It should be +5.0 VDC. 3. Measure the voltage between P/J281 pin 10, and frame ground. It should be +3.3 VDC. 9.5 on page 6-91). 4. Measure the voltage between P/J281 pin 1, and frame ground. It should be +24.0 VDC. Are all the voltages correct? 3 1. Switch the printer power OFF. 2. Reconnect P/J281 to the LVPS. 3. Switch the printer power ON and measure the voltages listed in Step 2, sub-steps 2 through 4. Are all the voltages correct? Go to step 9. Go to step 4. 4 1. Switch the printer power OFF. 2. Reconnect all the P/Js to the LVPS. 3. Disconnect the following from the Engine Logic Board: I P/J22 (Laser) I P/J21 (Laser, SOS) I P/J23 (Connector PWB) I P/J25 (Print Cartridge Sensor) I P/J32 (Exit Motor) I P29 (Main Motor) I P/J26 (HVPS PWB) I P/J27 (Exit Sensor) I P/J31 (Stack Full Sensor) I P/J33 (Size 1 PWB) I P/J34 (Duplex PWB) I P/J35 (Stacker PWB) 4. Switch the printer power ON and measure the voltages listed in Step 2, sub-steps 2 through 4. Are all the voltages correct? Go to step 5. Replace the Engine Logic Board (RRP 9.3 on page 6-89). 3-6 Phaser 4400 Laser Printer Service Manual