M126/M127/M128 6-60 SM
6.5.9 MAIN MOTOR SERVICE CHECK
FRU Action
Main motor gear drive
Main motor cable
LVPS/HVPS
Engine board
WARNING:
Do not replace the engine
board and controller board
at the same time. Each
board contains the machine
settings. When either of
these boards is new, it
obtains the settings from
the other board. Settings
are lost when both are new
and replaced at the same
time.
Turn off the machine, and unplug the main motor cable at
J17 on the engine board. Turn on the machine, and check
for the following voltages at J17:
1-4, 6 (Pins): Approx.5Vdc
7-9 (Pins): 18Vdc-24Vdc
Verify ground at pin 5 for both the card and cable.
If these voltages are correct, then check the main
motor cable for continuity.
-Remove the left side cover to access the connector
on the motor.
-If continuity exists on each wire, then replace the
main motor gear drive which includes the motor.
-If continuity does not exist on one or more of the
wires, then call the next level of support.
If these voltages are not correct, then see “Controller
and Engine Board Connector Pin Values” in “Product
Information”, or replace the engine board. See “Engine
Board Removal” in “Replacement and Adjustment”.
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