Diagnostic information 2-95
5060-4xx
956 service error
Service <xxxx> System Board
990 service error
This error indicates which option is causing the error.
5-Bin mailbox
Step Action and questions Yes No
1 Remove all option boards from the system board. Turn
on the printer.
Does the error continue?
Replace the
system board.
See “System
board” on
page 4-72.
Go to step 2
2
Replace each option board one at a time, making sure
the boards are properly seated. Turn the printer off and
then on between each option board to view any error
messages.
Does the error reappear?
Replace the
failing option
board.
Problem fixed.
Step Action and questions Yes No
1 Mechanical linkage/DC motor assembly - Check the
DC motor cable connector to make sure it is installed at
J4 on the control board.
Is the cable connected correctly?
Go to step 2 Reseat the cable
and recheck for
correct operation
of the option
2
Resistance check - Disconnect J4 from the option
board and check the resistance of the motor on the
cable connector between J2-1 and J2-2. The
resistance measures between 115 and 135 ohms.
Is the resistance correct?
Go to step 3 Replace the
mechanical
linkage/DC motor
assembly
3
DC motor - Check between J2-1 and between J2-2 and
the case of the DC motor for shorts.
Is the DC motor shorted?
Note: If the DC motor is shorted, damage may result to
the control board.
Replace the
mechanical
linkage/DC motor
assembly
Go to step 4
4
Output expander control board check - Disconnect the
motor cable J2 and check the voltages at J2 on the
board.
Warning: Be careful not to short to adjacent pins on
the connector.
The voltages measure:
(Note: All voltages are approximate values.)
J2-1 (motor Idle) +24 V dc
J2-2 (motor Idle) +24 V dc
J2-3 (motor Idle) +5 V dc
J2-4 (motor Idle) +5 V dc
Are the voltages correct?
Replace the
control board
Replace the
mechanical
linkage/DC motor
assembly
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