3-172 Phaser 7500 Printer Service Manual
Error Messages and Codes
2 Check the following:
■ The Flat Cable between the MCU
PWB J554 and the LPH Rear PWB
(K) J558 for open circuit, short
circuit, and poor contact.
■ The Flat Cable between the LPH H
PWB (K) J566 and the LPH (K)
J574 for open circuit, short circuit,
and poor contact (connection
within the LPH Unit).
■ The connector (P/J578) between
the LPH Rear PWB (K) and the LPH
H PWB (K) for damage and debris.
■ The LPH Unit (K) 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?
Replace the
following parts
in sequence:
■ LPH Unit (K)
(REP 2.1,
page 8-18)
■ LPH Cable
Assembly
■ LPH Rear
PWB (REP
2.4,
page 8-22)
■ MCU PWB
(REP 18.12,
page 8-202)
Repair the
sections that
have short
circuits and
poor contacts,
or initialize the
NVM.
3 Check the following:
■ The connection between the
Motor Drive PWB J518 and the
LPH Rear PWB (K) J550 for open
circuit, short circuit, and poor
contact.
■ The connection between the LPH
H PWB (K) J562 and the LPH (K)
J570 for open circuit, short circuit,
and poor contact (connection
within the LPH Unit).
■ The connector (P/J578) between
the LPH Rear PWB (K) and the LPH
H PWB (K) for damage and debris.
■ The LPH Unit (K) for improper
installation.
Are they normal, without any short
circuit, poor contact, and debris?
Replace the
following parts
in sequence:
■ LPH Unit (K)
(REP 2.1,
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)
Repair the
sections that
have short
circuits and
poor contacts
or, remove the
debris.
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No
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