Diagnostic Aids; Diagnostic Procedures; Printhead Diagnostics - Lexmark C78x Service Manual

3. Diagnostic aids

This chapter explains the tests and procedures to identify printer failures and verify repairs have corrected the
problem.

Diagnostic procedures

Printhead diagnostics

If you get a printhead error, follow this diagnostic to find the specific failure.
1.
Remove the top cover. See
2.
Remove the outer system board shield. See
3.
Verify that all the connectors are properly seated. Check the printhead cable connectors on the printheads
as well as the printhead cable connectors and mirror motor cable connectors on the system board.
If the printhead and mirror motor cables are properly seated and the error remains, record the error code.
Continue to the next step.
"Top cover assembly removal" on page
"Outer system board shield removal" on page
4-13.
4-69.
Diagnostic aids
5061
3-1