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Maintenance Module (MM)
Issues with the maintenance module (MM) cause a range of defects, as detailed in
the following sections. The maintenance module is also known as the service station (SS)
in some contexts and messages.
MM01: Wiper Not Spinning
The wiper roller is not spinning. No sound of the wiper motor is heard. Other
maintenance functions may also be affected.
Cause
The temperature is too high, the FW safety cable unplugged; a bad motor, cable,
PCA, or driver. An obstruction is in drive train. The drive train is loose, misaligned, or
broken.
Solution
1. First, disable the clamshell sensor by sending a TCL> nvm_getset.
2. Send a wipe command while the clamshell is open. Check that the wiper is installed
correctly and the retention clips are properly locked into place. If the problem
continues, you may need a new maintenance module.
3. Printer firmware estimated motor temperature and shuts off the motor if it is
believed to be too high. Waiting a few minutes should resolve this issue.
4. Maintenance module wiper assembly could be removed and turned by hand to
determine if it is physically able to rotate and not jammed up.
5. If it is jammed up, replace the maintenance module.
If not jammed, further troubleshooting is required to determine if problem is the
motor, cable, or PCA. See also the sections on servo, encoder and sensor failure.
MM02: Maintenance Module Is Not Going Home
The maintenance module is not homing, and may or may not be making noises when
trying to home. Printing and maintenance functions disabled as the MM will not be able
find other locations.
Cause
Send a home command while the clamshell is open; bad sensor, cable or PCA;
obstruction in sensor or in path of sled; faulty stepper, cable, PCA, pulley or gear,
misaligned sled.
Solution
Eject the sled and then reinstall. Be sure to make sure that the sled is not skewed
when installing; send a home command while the clamshell is open and check that the
station can home correctly.
If the issue continues, contact your application engineer for additional assistance.
Using TCL, query the sensor to get the state. Block or cover the sensor and query again
to see if state changed. Check continuity of cable, check voltage at sensor and MPCA.
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