Engine diagnostics
The product contains extensive internal engine diagnostics that help in troubleshooting print quality, paper
path, noise, assembly, and timing issues.
Defeating interlocks
Different tests can be used to isolate different types of issues. For assembly or noise isolation, run the
diagnostic test when the front and right doors are open. To operate the product with the doors open, the
door switch levers must be depressed to simulate a closed-door position.
WARNING! Be careful when performing product diagnostics to avoid risk of injury. Only trained service
personnel should open and run the diagnostics with the covers removed. Never touch any of the power
supplies when the product is turned on.
NOTE: The figures below look different than the M651 and M680 products. However, the procedure for
defeating the door interlocks is correct for these products.
1. Open the right and front doors.
2. Use a piece of tape to defeat the right door logic switch.
CAUTION: Make sure to use a thin piece of paper to activate the sensor. Using too thick of a piece of
paper, to activate this sensor, might dislodge the photo interrupter body from its internal mounting
bracket.
Figure 2-25 Defeating interlocks (1 of 2)
ENWW Tools for troubleshooting 145
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