Xerox 4400DT Service Manual - Page 111
Power Supply, Power Supply Troubleshooting Procedure, Actions and Questions
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Erratic Printer Operation Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 5 Replace the Engine Logic Board (RRP 9.3 on page 6-89). Does the problem still appear? Go to step 6. Problem solved. 6 Notify customer the cause of the trouble seems to be a communication problem between the host computer and the printer. The customer should contact Customer Support. Power Supply Power Supply Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Switch the printer power OFF. Go to step 2. Replace the 2. Disconnect the power cord. LVPS (RRP 3. 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). 9.5 on page 6-91). 4. Disconnect the following from the LVPS: I P/J281 (Engine Logic Board) (RRP 9.3, page 6-89) I P/J282 (Image Processor Board) (RRP 9.2 on page 6-88) I P/J11 (Fuser) (RRP 6.2 on page 6-66) I P/J283 (Main Fan) (RRP 9.1, page 6-87) I P/J284 (Front Interlock Switch) (RRP 9.9, page 6-96) I P/J1 (5 VDC Power Supply) (RRP 9.4, page 6-90) 5. Connect the power cord. 6. Switch the printer power ON and measure the voltages listed here on the LVPS. Red Lead P/J281 pin 7 P/J281 pin 10 P/J281 pin 1 Black Lead Frame Ground Frame Ground Frame Ground Voltage +5.0 VDC +3.3 VDC +24.0 VDC Are all voltages correct? 2 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 1. Are all voltages correct? Go to step 3. Go to step 4. 3 1. Switch the printer power OFF. Repeat the Replace the 2. Reconnect one of the plugs disconnected in step 1. 3. Switch the printer power ON. 4. Measure the voltages listed in step 1. step with the component next just disconnected connected to Are all voltages correct? plug. the LVPS. 3-14 Phaser 4400 Laser Printer Service Manual