Xerox 4400DT Service Manual - Page 88
Load MPT with [paper size] [paper type]., MPT Paper Empty
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Load MPT with [paper size] [paper type]. (MPT Paper Empty) Load MPT Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Enter Service Diagnostics and select Sensor Tests. It appears Go to step 2. 2. Scroll to Sensor Input test and press OK. 3. Actuate and deactuate the MPT No Paper Sensor. that the MPT No Paper Does the Front Panel display alternate between Sensor is "With Paper" and "Without Paper" as you press working and release the actuator? correctly. If a problem persists, replace the Engine Logic Board (RRP 9.3 on page 6-89). 2 Does the actuator move freely and is it in good Go to step 3. Replace the condition (not broken or damaged)? MPT No Paper Sensor Actuator (RRP 4.5 on page 6-50). 3 1. Switch the printer power OFF. Replace the Go to step 4. 2. Remove the Left Interface Cover (RRP 1.1 on Engine Logic page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Switch the printer power-on. 4. On the Engine Logic Board, measure the voltage Board (RRP 9.3 on page 6-89). between P/J23 pin 14 and frame ground. Is the voltage +3.3 VDC with the MPT No Paper Sensor deactuated and 0.0 VDC with the Sensor actuated? 4 1. Switch the printer power OFF. 2. Remove the Left Front Cover (RRP 1.7 on page 6-12). 3. Switch the printer power-on. 4. On the Connector PWB, measure the voltage between P/J45 pin 3 and frame ground. Replace the Connector PWB (RRP 9.7 on page 6-94). Go to step 5. Is the voltage +3.3 VDC with the MPT No Paper Sensor deactuated and 0.0 VDC with the Sensor actuated? 5 Check the voltage between P/J45 pin 1 and frame ground. Is the voltage +1.2 ±0.1 VDC? Replace the MPT No Paper Sensor (RRP 4.8, page 6-53). Replace the Engine Logic Board (RRP 9.3 on page 6-89). Phaser 4400 Laser Printer Service Manual 2-51
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