Table of Contents
Advertisement
990.01 error service check
This error indicates which option is causing the error.
5-Bin mailbox
Step
Actions and questions
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?
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?
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.
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—Motor cable (motor Idle)
J2-1
J2-2
J2-3
J2-4
Are the voltages correct?
+24 V dc
+24 V dc
+5 V dc
+5 V dc
Yes
No
Go to step 2
Reseat the cable,
and recheck for
correct operation
of the option
Go to step 3
Replace the
mechanical
linkage/DC motor
assembly.
Replace the
Go to step 4
mechanical
linkage/DC motor
assembly.
Replace the
Replace the
control board.
mechanical
linkage/DC motor
assembly.
Diagnostic information
5061
2-65
Advertisement
Table of Contents
