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2-85 4059 Service Manual
4059-XXX
990 Service - BIN X
FRU Action
1D.C.Motor
Mechanical Linkage
Assembly (Level 2)
Check the DC motor cable
connector to be sure it is correctly
installed at J4 on the output
expander option board. Go to
“Output Expander Control Board -
Level 2 DC Motor” on page 5-24.
If correct, disconnect J4 from the
option board and check the
resistance of the motor on the
cable connector: J4-1 to J4-2:
measures between 115 and 135
ohms. Also check J4-1 and J4-2to
the motor case for shorts. If either
the resistance is incorrect or a
short is found, replace the motor/
mechanical linkage assembly.
Note: If the DC motor is shorted, it
may also be necessary to replace
the control board.
2 Output Expander Control
Board (Level 2)
Disconnect the motor cable J4
and check the voltages at J4 on
theboard.Goto“Output
Expander Control Board - Level 2
DC Motor” on page 5-24.
Note: Use caution not to short to
adjacent pins on the connector.
J4-1 (Motor Idle) +24 V dc
J4-2 (Motor Idle) +24 V dc
J4-5 (Motor Idle) +5 V dc
J4-6 (Motor Idle) +5 V dc
If any of the voltages are incorrect,
replace the control board. If the
voltages are correct, replace the
DC motor/mechanical linkage
assembly.