Xerox 4400DT Service Manual - Page 127
MPT Pick Up Solenoid, MPT Feed Solenoid Troubleshooting Procedure, Actions and Questions
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MPT Pick Up Solenoid MPT Feed Solenoid Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Enter Service Diagnostics and select Solenoid Tests. Go to step 6. Go to step 2. 2. Scroll to MPT and press OK. Can you hear the MPT Pick Up Solenoid energize? 2 1. Switch the printer power OFF. Go to step 4. Go to step 3. 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/J23 on the Engine Logic Board. 4. Measure the resistance between pins 6 and 12 on the disconnected plug. Is the resistance approximately 75 to 95 ohms? 3 1. Remove the Front Cover (RRP 1.6 on page 6-11) and Replace the Replace the the Left Front Cover (RRP 1.7 on page 6-12). Connector MPT Pick Up 2. Disconnect P/J44 from the Connector PWB. 3. Measure the resistance between pins 1 and 2 on the disconnected plug. PWB (RRP 9.7 on page 6-94). Solenoid (RRP 4.9, page 6-55). Is the resistance approximately 75 to 95 ohms? 4 1. Reconnect P/J23. Go to step 5. Replace the 2. Switch the printer power ON. 3. Check the voltage between P/J23 pin 6 and frame ground. Engine Logic Board (RRP 9.3 on Is the voltage +24 VDC? page 6-89). 5 1. Enter Service Diagnostics and select Solenoid Tests. Replace the Replace the 2. Scroll to MPT but do not press OK. MPT Pick Up Engine Logic 3. While checking the voltage between P/J23 pin 12 and frame ground, press OK. Solenoid (RRP 4.9, Board (RRP 9.3 on Does the voltage drop from +24 VDC to 0.0 VDC page 6-55). page 6-89). when you press OK? 6 1. Switch the printer power OFF. The MPT Replace the 2. Open the Front Cover and remove the Print Cartridge. 3. With the Front Cover open, cheat the Front Cover Interlock. 4. Enter Service Diagnostics and select Main Motor + Clutch/Sol Tests. 5. Scroll to Motor + MPT Sol and press OK. Do the MPT Feed Rolls make one complete revolution then stop? Pick Up Solenoid appears to operate correctly. If the problem persists, replace the Engine Logic MPT Pick Up Solenoid (RRP 4.9 on page 6-55). Board (RRP 9.3 on page 6-89). 3-30 Phaser 4400 Laser Printer Service Manual