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TROUBLESHOOTING & REPAIR
CONTROL PC BOARD TEST (continued)
CONTROL PC BOARD VOLTAGE TEST POINTS CHART
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| Special |
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| |
| Signals Being | Expected | Conditions |
Test Points | Checked | Reading | for Test |
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3J13 to 5J13 | Regulated +15VDC | +15VDC | None |
| supply to control |
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| board |
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4J13 to 5J13 | Regulated | None | |
| supply to control |
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| board |
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1J13 to 2J13 | Unregulated DC | +12VDC | None |
| supply to control |
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| board |
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R11 to 5J13 | Low logic signal for | 0 - 2 VDC | TIG Mode |
| gas/water valve |
| Arc Start Switch or |
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| Amptrol must be |
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| activated |
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R32 to 5J13 | Low logic signal for | 0 - 2 VDC | If input contactor is |
| interlock control |
| staying closed signal |
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| will normally be low. |
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R13 to 5J13 | Low logic signal | 0 - 2 VDC | CAUTION: High |
| for high frequency |
| frequency may |
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| damage test |
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| equipment. |
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| Use analog |
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| volt/ohmmeter |
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| TIG Mode |
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| High frequency is |
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| active after gas |
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| preflow time. |
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R66 to 5J13 | Low logic signal for | 0 - 2 VDC | StickMode |
| DC OCV Boost |
| DC Mode |
| (CR3) relay |
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R8 to 5J13 | Low logic signal for | 0 - 2 VDC | Stick Mode |
| AC OCV Boost |
| AC Mode |
| (CR2) relay |
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SQUARE WAVE TIG 355
