Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 122

Print Cartridge Sensor Assembly Troubleshooting Procedure (cont'd.)
Step Actions and Questions
3 1. Enter Service Diagnostics and select Sensor Tests.
2. Scroll to Print Cartridge Switch and press OK.
3. Slide the Print Cartridge out and back in two or three
times.
Does the message on the front panel display
alternate between Installed and Not Installed as
you slide the print cartridge out and in?
4 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. Switch the printer power ON.
4. On the Engine Logic Board, check the voltage
between P/J25 pin 4 and frame ground.
Is the voltage +5.0 VDC?
5 1. Check the voltage between P/J25 pin 3 and frame
ground.
2. Slide the Print Cartridge out and back in two or three
times.
Is the voltage 0.0 VDC with the Print Cartridge
out, and +5.0 VDC with the Print Cartridge in?
6 1. Check the voltage between P/J25 pin 2 and frame
ground.
2. Slide the Print Cartridge out and back in two or three
times.
Is the voltage +3.3 VDC with the Print Cartridge
out, and 0.0 VDC with the Print Cartridge in?
Phaser 4400 Laser Printer Service Manual
page 6-7), and
page 6-16).
Yes No
Replace the Go to step 4.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Go to step 5. Replace the
Engine Logic
Board (RRP
9.3 on
page
Go to step 6. Replace the
Print
Cartridge
Sensor
Assembly
together with
the harness
(RRP 7.3,
page
Replace the Replace the
Engine Logic Print
Board (RRP Cartridge
9.3 on Sensor
page 6-89). Assembly
together with
the harness
(RRP 7.3,
page
6-89).
6-81).
6-81).
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