Xerox Phaser 7500 Service Manual page 308

Error Messages and Codes
3-170
Troubleshooting Procedure (Continued)
Step Actions and Questions
2 Check the following:
The Flat Cable between the MCU
■
PWB J555 and the LPH Rear PWB
(C) J559 for open circuit, short
circuit, and poor contact.
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.
The Drum/ Deve Drive Motor (Y,
■
M, C) for improper installation
(affected by the noises caused by
improper installation).
The NVM value for corruption.
■
Are they normal, without any short
circuit, poor contact, or corruption?
3 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) J563 and the LPH (C)
J571 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
circuit, poor contact, and debris?
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)
or initialize the
LPH Cable
NVM.
■
Assembly
LPH Rear
■
PWB (REP
2.4,
page 8-22)
MCU PWB
■
(REP 18.12,
page 8-202)
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)
or, remove the
LPH Cable
debris.
■
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)
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