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F-27 TROUBLESHOOTING AND REPAIRF-27
SWITCH BOARD TEST (continued)
FIGURE F.3 — SWITCH BOARD TEST POINTS.
SWITCH
BOARD
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11/12
OR
15/16
6.If any test fails replace both switch boards. See Switch Board Removal and Replacement.
7.If the switch board resistance tests are OK, check the molex pin connections and associated wiring from the switch boards to the control board. See wiring diagram.
-20 +19
13/14
OR
17/18
8.Reconnect leads 19C and 19D to the reconnect switches. Ensure that the leads are installed in the same location they were removed from.
9.Install the right and left case sides using the 3/8 in. nutdriver.
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TABLE F.1 — SWITCH BOARD RESISTANCE TEST.
APPLY POSITIVE TEST | APPLY NEGATIVE TEST | NORMAL |
PROBE TO TERMINAL | PROBE TO TERMINAL | RESISTANCE READING |
|
|
|
+19 | 11/12 OR 15/16 | Greater than 1000 ohms |
+19 | 13/14 OR 17/18 | Greater than 1000 ohms |
11/12 OR 15/16 | - 20 | Greater than 1000 ohms |
13/14 OR 17/18 | - 20 | Greater than 1000 ohms |
- 20 | 11/12 OR 15/16 | Less than 100 ohms |
- 20 | 13/14 OR 17/18 | Less than 100 ohms |
11/12 OR 15/16 | +19 | Less than 100 ohms |
13/14 OR 17/18 | +19 | Less than 100 ohms |
|
|
|
