Lexmark C920 - Printer;Printhead Controller Board Communication Error; Finisher Communication Error

Diagnostic information 2-17
5056-XXX
946 - Printer/Printhead Controller Board Communication Error
947 - Finisher Communication Error
946 Service
Communication
Step Questions/actions Yes No
1 Is CN03 on the printhead controller board or CN14 on
the printer controller board connected properly?
Go to step 2. Connect cables.
2
Make sure all printhead LED EPROMS are present on
the printhead controller board.
Are all the EPROMS present?
Go to step 3. Install the
EPROM(s)
included with
printhead FRU.
3
Replace the printhead controller board.
Did this fix the problem?
Problem solved. Replace the
printer controller
board.
Step Questions/actions Yes No
1 Are the finisher to printer interface cable and power
cable properly connected?
Go to step 2. Properly connect
the cable.
2
Replace the interface cable. Did this resolve the
problem?
Problem solved. Replace the
control finisher
board. Go to step
3.
3
Did finisher control board replacement resolve the
problem?
Problem solved. Replace the
printer control
board.