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4026-0XX
Diagnostic Information 2-27
Operator Panel Service Check
FRU Action
1
Operator
Panel Assem-
bly
LEDs
Be sure the operator panel cable is properly
seated in J5 on the controller board.
Run POST and check each LED for proper
operation.
If more than one LED does not light or an indi-
vidual LED stays on solid during POST, replace
the following FRUs one at a time in the order
shown:
Controller board
Operator panel
If all LEDs are very dim and operate erratically
during POST or all LEDs come on and stay on
solid during POST replace the following FRUs
one at a time in the order shown:
Operator panel assembly
Controller board
If none of the LEDs are on, be sure +5 V dc is
present at J1-2 on the controller board. If cor-
rect, replace the operator panel assembly. If
incorrect, replace the controller board.
If all the LEDs come on and remain on, replace
the following FRUs one at a time in the order
shown:
Operator Panel Assembly
Controller Board
Button Inoperative
Disconnect the operator panel cable at J5 on the
controller board. Check the continuity between
J5-5andJ5-6onthecableasyoupressthebut-
ton. The meter should read from approximately
10K ohms to approximately zero ohms when the
button is pressed.
If the continuity is incorrect, replace the operator
panel assembly. If correct, replace the following
FRUs one at a time in the order shown:
Operator Panel Assembly
Controller Board