Xerox Phaser 7500 Service Manual page 286

Error Messages and Codes
3-148
Troubleshooting Procedure (Continued)
Step Actions and Questions
2 Check the following:
The connection between the
■
Motor Drive PWB J518 and the
LPH Rear PWB (C) J551 for open
circuit, short circuit, and poor
contact.
The connection between the LPH
■
H PWB (C) J563and the LPH (C)
J571 for open circuit, short circuit,
and poor contact (connection
within the LPH Unit).
The Flat Cable between the MCU
■
PWB J555 and the LPH Rear PWB
(C) J559 for open circuit, short
circuit, and poor contact
(especially for short circuit
between MCU PWB J555 pins-28/
27 and LPH Rear PWB (C) J559
pins-1/2).
The Flat Cable between the LPH H
■
PWB (C) J567 and the LPH (C)
J575 for open circuit, short circuit,
and poor contact (connection
within the LPH Unit).
The connector (P/J579) between
■
the LPH Rear PWB (C) and the LPH
H PWB (C) for damage and debris.
The LPH Unit (C) for improper
■
installation.
Are they normal, without any short
circuits, poor contacts, and etc.?
3 Check the connection of the Motor
Drive PWB J518 connector.
Is the Motor Drive PWB J518
connector properly connected?
Yes No
Replace the Repair the
following parts sections that
in sequence: have short
circuits and
LPH Unit (C)
■
(REP 2.1, poor contacts.
page 8-18)
LPH Cable
■
Assembly
LPH Rear
■
PWB (REP
2.4,
page 8-22)
Motor Drive
■
PWB (REP
18.13,
page 8-204)
MCU PWB
■
(REP 18.12,
page 8-202)
Replace the Connect the
following parts Motor Drive
in sequence: PWB J518
connector
Motor Drive
■
PWB (REP properly.
18.13,
page 8-204)
MCU PWB
■
(REP 18.12,
page 8-202)
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