4-64 Service Manual
7510
Warning: Ensure that the harness coupler (B) is removed from the old developer unit assembly (A) and
installed on the new one.
Note: Installation of a new developer requires installation of the appropriate carrier. See page 4-70 for the
instructions on how to install the new carrier.
Replacement warning: Ensure that the rear area new developer unit assembly (A) is properly engaged
into the machine or the magnetic rolls will not turn properly.
Use the following procedure to test for proper magnetic roll engagement immediately after installing the new C,
M or Y developer unit assembly (A):
CAUTION: When performing motor tests, ensure that all cover and door interlock switches are overridden.
• Enter the diagnostic mode.
• Touch MOTOR TESTS.
• Touch Printer Motor Tests.
• Touch CMY developer drive motor (this test will not work for the K developer unit assembly).
Warning: If the magnetic roll and the waste auger can be seen turning then the developer unit assembly
(A) is installed correctly, if the magnetic roll and the waste auger are not turning, then the developer unit
assembly (A) must be reinstalled and the motor test repeated.
Warning: When replacing the developer interlock plate assembly, ensure that the erase lamp harnesses
and developer unit assembly harnesses are correctly installed in the clamps, or they may become
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