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| TROUBLESHOOTING & REPAIR |
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TOC | TOC | ACTIVE SCR TEST (continued) |
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Section | Master |
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P1 AND P3 LOCATIONS |
| G1575 LEAD LOCATIONS |
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| FIGURE F.16 – CONTROL BOARD PLUG |
| FIGURE F.17 – CONTROL BOARD |
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to | to |
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| R3R CONTROL |
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Return | Return |
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| G1 |
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| G2 | G3 |
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| G1575 - [ | ] |
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TOC | TOC |
| Plug P3 |
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R3R CONTROL |
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Section | Master |
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G2206 - [ | ] |
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to | to | Plug P4 (Removed) |
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Return | Return | FIGURE F.18 – SNUBBER BOARD PLUG | FIGURE F.19 – RESISTOR R3 LOCATION | |
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| P5 LOCATION |
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| Plug P5 |
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| RESISTOR R3 |
Section TOC | Master TOC |
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Return to | Return to |
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TEST PROCEDURE |
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| 1. | Disconnect the main input supply power to | 5. | Locate and remove molex plug P5 from |
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| the machine. |
| snubber board M15370. See Figure F.18. If |
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| 2. | With the 5/16” nut driver, remove the case |
| the machine has snubber board M14215, it |
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| will be necessary to label and disconnect | ||
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| top and sides. Remove the screws holding |
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| lead #204 from the output shunt. Be sure to | |
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| the front panel and lower the panel. |
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| disconnect the #204 lead that runs | |
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TOC | TOC | 3. | Disconnect the welding cables from the |
| between the snubber board and the out- |
| welding output terminals. |
| put shunt. | ||
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Section | Master | 4. | Locate and remove molex plug P4 from con- | 6. | Locate and remove lead #204 from resistor |
| If the machine has control board G1575, dis- |
| R3 (40 ohms, 50 Watts). See Figure F.19. | ||
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| trol board G2206. See Figure F.16. |
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to | to |
| connect the individual gate leads G1, G2, |
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Return | Return |
| and G3 and also lead #204. See Figure F.17. |
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| IDEALARC R3R |
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