3-78 Phaser 6180 Color Laser Printer Service Manual
Error Messages and Codes
MCU Communication Error
The MCU Board detected communication error.
Applicable Chain Link
■ Chain Link 024-371: MCU Comm Error
Initial Actions
■ Cycle printer power.
■ If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ MCU Board, PL9.1.20
■ Image Processor Board, PL9.1.27
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Reseat the Image Processor Board 
and the MCU Board. Does the error 
still occur?
Go to step 2. Complete.
2 Replace the Image Processor Board 
(page 8-89). Does the error still 
occur?
Replace the 
MCU Board 
(page 8-87).
Complete.