3-158 Phaser 7500 Printer Service Manual
Error Messages and Codes
2 Perform the following steps:
■ Check the Flat Cable between the
MCU PWB J554 and the LPH Rear
PWB (K) J558 for open circuit,
short circuit, and poor contact.
■ Check 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).
■ Check the connector (P/J578)
between the LPH Rear PWB (K)
and the LPH H PWB (K) for
damage and debris.
■ Check the LPH Unit (K) for
improper installation.
■ Perform the LED EEPROM test in
Diagnostics.
Are they normal, without any short
circuits, poor contacts, and etc.?
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.
Troubleshooting Procedure (Continued)
Step Actions and Questions Yes No
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