Xerox 5400N - Phaser B/W Laser Printer, Service Quick Reference Manual, Page: 166 / 503

Phaser 5400 Laser Printer Service Guide 137
RAP 51 MBF No Paper Sensor
.
Table 80 MBF No Paper Sensor Troubleshooting Procedure
Step Actions and Questions Yes No
1
PROCEDURE
1. Open the MBF Door and remove all paper from the
MBF.
2. Enter Diagnostics mode
3. From the Main Menu, select Component Test / Sensor
Input / press [4] to start, [0] to stop.
4. Actuate and deactuate the MBF No Paper Sensor
Actuator.
Does the LCD counter increment each time you
press and release the actuator?
It appears
the MBF No
Paper
Sensor is
working
correctly. If a
problem
persists,
replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310 ].
Go to
Step 2.
2 MBF NO PAPER SENSOR ACTUATOR
INSPECTION
1. Manually move the MBF No Paper Sensor Actuator.
2. Visually inspect the MBF No Paper Sensor Actuator.
Does the actuator move freely and appear to be
in good condition (not broken or damaged)?
Go to
Step 3. Replace the
MBF No
Paper
Sensor Actor
[RRP 2.7,
page 267 ].
3 “YES” FROM STEP 2 ABOVE
1. Switch printer power OFF.
2. Remove the Left Side Cover [RRP 1.1, page 250 ] and
the Print Engine Controller Board Cover [RRP 8.5,
page 310 ].
3. Disconnect P/J12 from the Print Engine Controller
Board.
4. Switch printer power ON.
CAUTION! In the next step you will be very close to
P12-10, which is the +24 VDC supply. If accidently
shorted to pin 9, the Print Engine Controller Board will
be immediately destroyed. Use extreme caution in
making this measurement.
5. On the Print Engine Controller Board, measure the
voltage between P12-7 and frame ground, then
between P12-9 and frame ground.
Are both voltage re3.28 VDC?
Go to
Step 4. Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310 ].
4 “YES” FROM STEP 3 ABOVE
1. Switch printer power OFF.
2. Reconnect P/J12 to the Print Engine Controller Board.
3. Enter Diagnostics mode.
4. From the Main Menu, select Component Test / Sensor
Input / press [4] to start, [0] to stop.
5. On the Print Engine Controller Board, measure the
voltage between P/J12-9 and frame ground.
Does the voltage m3.28 VDC between
P12-9 and frame ground when the MBF No Paper
Sensor is deactuated and 0.0 VDC when
actuated?
Replace the
Print Engine
Controller
Board
[RRP 8.5,
page 310 ].
Go to
Step 5.