3-96 Phaser 6128MFP Service Manual
Error Messages and Codes
MCU NVRAM Error
Engine NVRAM is corrupted. The following troubleshooting procedure applies to
this error.
Applicable Error
• 041-340: MCU NVRAM Error
Initial Actions
• Reseat the Imaging Unit and Toner Cartridges.
• Cycle printer power.
• If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ Imaging Unit, PL4.1.21
■ Toner Cartridge, PL5.2.21~24
■ Toner CRUM Harness, PL5.1.26
■ MCU Board, PL10.7.7
■ EEPROM Board, PL10.7.6
■ Imaging Unit Harness, PL10.8.11
■ “Map 1 - MCU Board” on page 10-6
■ “Map 4 - Imaging” on page 10-9
■ “Xerographics” on page 10-18
■ “Toner Dispense” on page 10-20
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Check these connections:
■ P/J311 Yellow Cartridge CRUM
■ P/J312 Magenta Cartridge CRUM
■ P/J313 Cyan Cartridge CRUM
■ P/J314 Black Cartridge CRUM
■ P/J31 and P/J42 on the MCU Board
■ P/J144 on the EEPROM Board
■ P/J422 on the Imaging Unit
Are the connections secure?
Go to step 2. Secure the
connections.
2 Check Toner CRUM harness
continuity. Disconnect:
■ J311 from the Yellow CRUM
■ J312 from the Magenta CRUM
■ J313 from the Cyan CRUM
■ J314 from the Black CRUM
■ J31 from the MCU Board
Is the harness damaged?
Repair the
harness.
Go to step 3.
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