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TROUBLESHOOTING & REPAIR | ||
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POWER BOARD VOLTAGE TEST (continued)
TABLE F.4. Power Board Voltage Test Points.
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| ACCEPTABLE |
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| TEST DESCRIPTION | TEST POINTS | VOLTAGES | TEST CONDITIONS | |
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| The PWM pulse drive from the | Lead #307 (2J6) | 14VDC. | No load on the machine - the | |
| control board to the pulse | to |
| mode switch in SMAW posi- | |
| transformer primary located on | Negative output terminal |
| tion. | |
| the power board. |
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| The PWM pulse drive from the | Lead #308 (1J6) | 14VDC. | No load on the machine - the | |
| control board to the pulse | to |
| mode switch in SMAW posi- | |
| transformer primary located on | Negative output terminal |
| tion. | |
| the power board. |
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| The PWM pulse drive from the | Lead #307 (2J6) | 7VDC. | Machine loaded to 250Amps. | |
| control board to the pulse | to |
| The output control R3 at the | |
| transformer primary located on | Negative output terminal |
| maximum position. | |
| the power board. |
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| The PWM pulse drive from the | Lead #308 (1J6) | 7VDC. | Machine loaded to 250Amps. | |
| control board to the pulse | to |
| The output control R3 at the | |
| transformer primary located on | Negative output terminal |
| maximum position. | |
| the power board. |
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| CR1 (charge relay) coil volt- | Lead #309 (6J6)+ | 12VDC | This voltage should be pre- | |
| age. | to |
| sent only after the protection | |
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| lead #310 (3J6) |
| circuit as been satisfied. | |
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| This low voltage will be pre- | Lead #311 (4J6)+ | 0 to 1VDC. | If voltage protection circuit IS | |
| sent when the protection cir- | to |
| satisfied. | |
| cuit has determined that the | lead #313 (5J6)- |
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| filter capacitor voltage is |
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| acceptable. Note: The CR1 |
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| charge relay should be acti- |
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| vated. |
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| This voltage will be present | Lead #311 (4J6)+ | 15VDC. | If voltage protection circuit is | |
| unit the protection circuit | to |
| NOT satisfied. | |
| determines that the filter | lead #313 (5J6)- |
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| capacitor is at an acceptable |
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| level. |
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| Note: The CR1 charge relay |
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| will not be activated. |
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