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TROUBLESHOOTING & REPAIR
SCR REMOVAL AND REPLACEMENT (continued)
FIGURE F.43 – SCR DETAILS
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SPECIAL INSTRUCTIONS
NOTE: Before disassembling the existing rectifi- er, note toward which heat sink the outer metal ring of the power SCR is mounted. Also, note the positioning of the gate lead of the SCR. Failure to reinstall the new SCR in the same orientation as the original may result in subsequent damage to the new SCR and other components of the welder. See Figure F.43.
CAUTION
The unclamping and clamping procedure outlined below is critical for the prevention of internal SCR damage. Failure to follow this procedure may result in subsequent damage of the SCR. Handle all SCRs with care.
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