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TROUBLESHOOTING & REPAIR
SNUBBER RESISTORS TEST (continued)
FIGURE F.13 - SWITCH BOARD TEST POINTS
401/403 | 9 | 12 | 402/40412 |
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L8441 | SWITCH |
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6.Test for 25 ohms resistance from lead termi- nal 401 to terminal 12 on the switch board. See Figure F.13.
a.If 25 ohms is measured, resistor R4 is OK.
b.If 30 ohms or more is measured, resistor R4 is faulty and must be replaced.
c.If 20 ohms or less is measured, resistor R4 is faulty and must be replaced.
7.Repeat the same procedures to test R5, R6, and R7 according to Table F.6.
8.Reconnect leads 401/403 and 402/404 to the switch board.
9.Install the case wraparound cover.
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TABLE F.6 – SNUBBER RESISTORS TEST
Check | Test Result | Conclusion | Next Test Step | Repair Action |
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Lead 401 to | 25 ohms | OK | Continue |
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Terminal 12 | >30 ohms | R4 open |
| Replace R4 |
| <20 ohms | R4 faulty |
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Lead 402 to | 25 ohms | OK | Continue |
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Terminal 9 | >30 ohms | R5 open |
| Replace R5 |
| <20 ohms | R5 faulty |
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Lead 403 to | 25 ohms | OK | Continue |
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Terminal 12 | >30 ohms | R6 open |
| Replace R6 |
| <20 ohms | R6 faulty |
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Lead 404 to | 25 ohms | OK | Continue |
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Terminal 9 | >30 ohms | R7 open |
| Replace R7 |
| <20 ohms | R7 faulty |
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> = GREATER THAN < = LESS THAN
