HP 4600 Service Manual - Page 417
Engine diagnostics, Diagnostics mode
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HP CLJ 4600 HP CLJ 4610n HP CLJ 4650 Formatter LED location Figure 7-17 HP Color LaserJet 4600 Series formatters Engine diagnostics This section provides an overview of the engine diagnostics that are available in the HP Color LaserJet 4600 Series printer. The printer contains extensive internal diagnostics that help in troubleshooting print-quality, paper-path, noise, component, and timing issues. Diagnostics mode Some of the diagnostic tests automatically put the printer into a special diagnostics mode. During the special diagnostics mode the printer can perform actions that would normally cause the printer to enter an error state. Always follow the control-panel directions in the Diagnostic menu to exit the special diagnostics mode correctly and return the printer to a normal state. Diagnostics that put the engine into the special diagnostics mode Four diagnostic tests put the engine into a special state: ■ Disable cartridge check ■ Sensor test ■ Manual sensor test ■ Component test While the printer is in the special diagnostics mode, the following message should appear: READY DIAGNOSTICS MODE TO EXIT PRESS CANCEL JOB KEY (HP Color LaserJet 4600 models) TO EXIT PRESS STOP KEY (HP Color LaserJet 4610n and 4650 models) ENWW Diagnostics 401
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