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TROUBLESHOOTING & REPAIR
STATIC SCR/DIODE RECTIFIER BRIDGE TEST (continued)
FIGURE F.9 – CONTROL BOARD AND SNUBBER BOARD PLUG LOCATIONS
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Plug P3
#203
#204
#202 
#201
Plug P1
| Plug P5 |
] SNUBBER |
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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.
3.Disconnect the welding cables from the welding output terminals.
4.Locate and remove molex plug P3 from the control board. See Figure F.9.
5.Locate and remove molex plug P5 from the snubber board. See Figure F.9.
6.Locate and remove lead #204 from resistor R2 (7.5 ohms, 100 watts). See Figure F.14.
7.Using the 9/16” wrench, remove the positive capacitor strap lead and small lead terminal from the rectifier plate and output shunt junc- tion. See Figure F.10.
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FIGURE F.10 – CAPACITOR STRAP LEAD CONNECTIONS
POSITIVE
CAPACITOR
STRAP LEAD
