Xerox PHASER 7500 - Page 337

Phaser 7500 Printer Service Manual 3-199
Error Messages and Codes
3 Turn Off the power, then measure
the Tray 3 Feed/ Lift Up Motor wire
resistance.
Remove the Tray 3 Feed/ Lift Up
Motor, then measure the following
resistances.
■ Between J221 pin-1 and J221
pin-2
■ Between J221 pin-3 and J221
pin-4
Is the resistance approximately 4
Ohm for each?
Go to step 4. Replace the Tray
3 Feed/ Lift Up
Motor (REP 10.3,
page 8-93).
4 When 3TM is connected:
Check the connection between the
Tray Module PWB J550 and the
Tray 3 Feed/ Lift Up Motor J221 for
open circuit, short circuit, and poor
contact.
When STM is connected:
Check the connection between the
STM PWB J550 and the Tray 3
Feed/Lift Up Motor J221 for open
circuit, short circuit, and poor
contact.
Is it conducting properly?
Replace the
following parts
in sequence:
When 3TM is
connected:
■ Tray Module
PWB (REP
10.9,
page 8-97)
When STM is
connected:
■ STM PWB
(REP 11.10,
page 8-120)
■ TM Relay
PWB (REP
18.14,
page 8-205)
■ Motor Drive
PWB (REP
18.10,
page 8-197)
■ MCU PWB
(REP 18.12,
page 8-202)
Repair the
sections that
have short
circuits and poor
contacts.
5 Perform the Tray 3 Sensors test in
Diagnostics.
Use a sheet of paper, etc. to block/
clear the light path to the Tray 3
Nudger Level Sensor.
Does the display change between
High/ Low?
Go to step 6. Go to “General
Sensor Failure”
on page 3-28 to
check the
Tray 2 Nudger
Level Sensor.
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No