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TROUBLESHOOTING & REPAIR
ACTIVE SCR TEST (continued)
FIGURE F.12 – CONTROL BOARD PLUG | FIGURE F.13 – SNUBBER BOARD |
P1 AND P3 LOCATIONS | PLUG P5 LOCATION |
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] | |||
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| #203 |
Plug P3 |
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| #204 |
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| #202 | #201 |
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| Plug P1 |
| Plug P5 |
] SNUBBER |
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FIGURE F.14 – RESISTOR R2 LOCATION
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TEST PROCEDURE
1.Disconnect the main input supply power to the machine.
2.With the 5/16” nut driver, remove the case top and sides. Remove the screws holding the front panel and lower the panel.
3.Disconnect the welding cables from the welding output terminals.
4.Locate and remove molex plug P3 from the control board. See Figure F.12.
5.Locate and remove molex plug P5 from the snubber board. See Figure F.13.
6.Locate and remove lead #204 from resistor R2 (7.5 ohms, 100 Watts). See Figure F.14.
7.Using 9/16” wrench, remove the positive capacitor strap lead and small lead terminal from the positive rectifier plate and output shunt junction. See Figure F.10.
