Maintenance and Troubleshooting
Chapter 5
59
System Power Supply Replacement
The System Power Supply should be replaced if it is unable to provide the
correct output voltages to power the Processor and I/O Modules. perform the
following steps to replace the Power Supply:
1.
Turn the Processor’s Mode Select Switch to the PROG mode and support
Processor memory.
D
ARE
OUTPUT DEVICES
ON WHEN THEY
SHOULD BE OFF
?
OUTPUT DEVICES ARE
OFF WHEN THEY SHOULD
BE ON
IS
THE OUTPUT
MODULE
INDICATOR
ON ?
IS
ANY FUSE
BLOWN
INDICATOR
ON ?
YES
TURN MODE SELECT SWITCH
TO TEST OR OPERATE REMOTELY
BY PRESSING [SEARCH]
[5] [9] [1]
CHECK FOR SHORTED WIRING
TO OUTPUT DEVICE
CHECK FOR SHORTED
WIRING TO OUTPUT DEVICE
REAPPLY I/O POWER
IF NECESSARY
IS
THE OUTPUT
MODULE
INDICATOR
ON ?
YES
REMOVE I/O POWER
DISCONNECT WIRING AT
FIELD WIRING ARM
TERMINAL RESTORE
I/O POWER
IS
THE OUTPUT
MODULE
INDICATOR
ON ?
REMOVE SYSTEM POWER AND
I/O POWER REPLACE OUTPUT
MODULE RESTORE SYSTEM
POWER AND I/O POWER
RESTART CONTROLLER
VERIFY PROPER OPERATION
CHECK WIRING TO
OUTPUT DEVICE FOR
OPEN CIRCUIT
REMOVE SYSTEM POWER
AND I/O POWER. CORRECT
CAUSE OF BLOWN FUSE
–– CHECK OUTPUT DEVICE
AND WIRING
REPLACE BLOWN FUSE. RESTORE
SYSTEM POWER AND I/O POWER
RESTART CONTROLLER
VERIFY PROPER OPERATION
REMOVE SYSTEM AND I/O POWER
REPLACE OUTPUT MODULE.
RESTORE SYSTEM AND I/O POWER
REMOVE SYSTEM POWER AND
I/O POWER CHECK AND RESET
MODULE IN I/O CHASSIS
RESTORE SYSTEM POWER
AND I/O POWER
IS
PROBLEM
SOLVED
?
RESTART CONTROLLER
VERIFY PROPER OPERATION
NO
YES
YES
NO
NO
YES
NO
NO
NO
YES
10138–I
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