Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 127

MPT Pick Up Solenoid
MPT Feed Solenoid Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select Solenoid Tests.
2. Scroll to MPT and press OK.
Can you hear the MPT Pick Up Solenoid
energize?
2 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
Left Plate (RRP 1.11 on
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
the Left Front Cover (RRP 1.7 on
2. Disconnect P/J44 from the Connector PWB.
3. Measure the resistance between pins 1 and 2 on the
disconnected plug.
Is the resistance approximately 75 to 95 ohms?
4 1. Reconnect P/J23.
2. Switch the printer power ON.
3. Check the voltage between P/J23 pin 6 and frame
ground.
Is the voltage +24 VDC?
5 1. Enter Service Diagnostics and select Solenoid Tests.
2. Scroll to MPT but do not press OK.
3. While checking the voltage between P/J23 pin 12 and
frame ground, press OK.
Does the voltage drop from +24 VDC to 0.0 VDC
when you press OK?
6 1. Switch the printer power OFF.
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?
3-30
page 6-7), and the
page 6-16).
page 6-11) and
page 6-12).
Phaser 4400 Laser Printer Service Manual
Yes No
Go to step 6. Go to step 2.
Go to step 4. Go to step 3.
Replace the Replace the
Connector MPT Pick Up
PWB (RRP Solenoid
9.7 on (RRP 4.9,
page 6-94). page
Go to step 5. Replace the
Engine Logic
Board (RRP
9.3 on
page
Replace the Replace the
MPT Pick Up Engine Logic
Solenoid Board (RRP
(RRP 4.9, 9.3 on
page 6-55). page
The MPT Replace the
Pick Up MPT Pick Up
Solenoid Solenoid
appears to (RRP 4.9 on
operate page
correctly. If
the problem
persists,
replace the
Engine Logic
Board (RRP
9.3 on
page 6-89).
6-55).
6-89).
6-89).
6-55).