Xerox 4400DT Service Manual - Page 120
Stack Height Sensor Checkout, Actions and Questions
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Output Tray Full Sensor Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 2 Visually inspect the Output Tray Full Sensor Actuator. Go to step 3. Replace the Does the actuator moves freely and is it in good condition (not broken or damaged)? Output Tray Full Actuator (RRP 6.8 on page 6-76). 3 1. Switch the printer power OFF. Go to step 5. Go to step 4. 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 P/J31 from the Engine Logic Board. 4. Switch the printer power ON. 5. On the Engine Logic Board, measure the voltage between P31 pin 1 and frame ground. Is the voltage +3.3 VDC? 4 On the Engine Logic Board, measure the voltage between P/J28 pin 10 and frame ground. Is the voltage +3.3 VDC? Replace the Engine Logic Board (RRP 9.3 on page 6-89). Replace the LVPS (RRP 9.5 on page 6-91). 5 1. Switch the printer power OFF. Replace the Replace the 2. Reconnect P/J31 to the Engine Logic Board. Switch Engine Logic Output Tray the printer power ON. 3. On the Engine Logic Board, measure the voltage between P/J31 pin 3 and frame ground. Board (RRP 9.3 on page 6-89). Full Sensor (RRP 6.6, page 6-72). Is there +3.3 VDC between P/J31 pin 3 and frame ground when the Output Tray Full Sensor is deactuated, and 0.0 VDC when actuated? Stack Height Sensor Checkout Stack Height Sensor Checkout Procedure Step Actions and Questions Yes No 1 1. Remove the tray from the feeder demonstrating a Go to step 3. Go to step 2. problem. 2. Release the sensor from the feeder frame but do not disconnect the plug from the sensor. 3. Measure the voltage on the pins as listed in the "Stack Height Sensor Voltages" table. Does the voltages on the bottom pin match the voltage listed in the table? 2 Check the wiring harness between the sensor and the Replace the Replace the Feeder PWB. sensor (RRP sensor wiring Is the wiring in good condition? 3.4 on harness. page 6-31). (Item 14 in PL 3.1 on page 7-10) Phaser 4400 Laser Printer Service Manual 3-23
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