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TROUBLESHOOTING & REPAIR
FOR REPLACEMENT OF SWITCH ASSEMBLY
FIGURE F.80 - PC BOARD RECEPTACLE
P23
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3
5
6
1. | Unplug P23 and insert jumper plug into PC | 5. | Turn ON the arc start switch. | See Arc Start | |||||
| board receptacle. See Figure F.80. |
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| PW450 with wire Feeder or Figure | F.79. | ||||
2. | Turn ON the preset power switch. See | 6. | Attach the oscilloscope probes to each of the | ||||||
| Figure | F.78. |
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| following eight test points. | Each | test point | ||
3. | Press | the MANUAL PROCEDURE ENTRY |
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| should | look like the oscilloscope | picture in | ||
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| Figure | F.81. |
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| (64) key on the Calibration & Test overlay and |
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| using the arrow keys (100) and (101) change |
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| WARNING |
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| the Power Wave to “Process 1 Setup |
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| mode. |
| ALL METERS AND OSCILLOSCOPES MUST | ||||||
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4. | Set the Oscilloscope for: | BE ELECTRICALLY ISOLATED (isolation trans- | |||||||
| 20 V/div. | former). |
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| 20 uS/div. |
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POSITIVE PROBE | NEGATIVE PROBE |
#1 P40 pin 14 | P40 pin 16 |
#2 P40 pin 9 | P40 pin 11 |
#3 P40 pin 6 | P40 pin 8 |
#4 P40 pin 1 | P40 pin 3 |
#5 P41 pin 15 | P41 pin 16 |
#6 P41 pin 9 | P41 pin 10 |
#7 P41 pin 7 | P41 pin 8 |
#8 P41 pin 1 | P41 pin 2 |
