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2-58 Service Manual
4085-001
Operator Panel (Buttons) Service Check
FRU Action
1 Operator Panel
Assembly
If any button fails the button test, replace the
operator panel assembly. See “Button Test” on
page 3-23 .
2 Engine Board
Operator Panel
Assembly
With the operator panel connected to the engine
board, be sure the voltage at (J4) pins 1, 2, 3 and
5 measures +5 V dc. If the voltage is incorrect,
replace the engine board. If the voltage is correct,
check the continuity of the operator panel cable.
Replace the operator panel cable if continuity is
incorrect. If correct, replace the operator panel
assembly.