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Figure 7-13.
Formatter LED
Engine diagnostics
This section provides an overview of the engine diagnostics incorporated into the HP Color
LaserJet 3500/3550 and 3700 series printer. The printer contains extensive internal
diagnostics that help in troubleshooting print quality issues, paper path issues, noise issues,
component issues, and timing issues.
Diagnostics mode
Some of the diagnostic tests automatically put the printer into a special diagnostics mode.
The special diagnostics mode allows the printer to perform actions that it normally could not
because the printer would enter an error state. Always follow the control panel directions in
the Diagnostic menu to properly exit the special diagnostics mode and return the printer to a
normal state.
Diagnostics that put the printer into special diagnostics mode
There are four diagnostic tests that put the printer into a special state:
● Disable cartridge check
● Paper path sensor test
● Manual sensor test
● Component test
While the printer is in the special diagnostics mode, the display should read:
Ready Diagnostics Mode
To exit press Stop KEY
434 Chapter 7 Troubleshooting ENWW