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| TROUBLESHOOTING & REPAIR |
STT CHOPPER BOARD TEST (CONTINUED)
FIGURE F.10 – STT CHOPPER BOARD TEST DETAILS
CONTROL PC BOARD | POWER PC BOARD |
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| J7 |
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| J43 | ||
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| J7 |
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| J43 |
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1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 346 | 1 | 2 | 3 | 4 | 5 | 6 |
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9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 7 | 8 | 9 | 10 | 11 | 12 |
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| 4W 4R |
| 345 |
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STT OUTPUT
TERMINAL
POWER WAVE + OUTPUT TERMINAL
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TEST PROCEDURE
1.Remove input power to the Power Wave 455/R.
2.Using the 3/8” nut driver, remove the case top and the control box cover. See Figure F.10.
3.Perform the following resistance tests:
+probe on the STT output terminal
- probe on the Power Wave + output ter- minal
The reading should be approximately 300,000 ohms
+probe on the Power Wave + output ter- minal
- probe on the STT output terminal
The reading should be less than 500 ohms
If both the polarity resistance tests are low, either the STT Chopper Module is faulty or diode D6 is shorted. See the Wiring Diagram.
