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