Breakerdown Appearances: Welding current of French SAF welding machine can’t shift higher;

Troubleshooting: After PCB Repair of key component we have found the current control circuit board is malfunctions, inspect this PCB and found a operational amplifier chip LF347 has failed, because we don’t have this chip in-stock, so use LM124 as substitute to maintain the machine can keep on working, after 15 days later LM124 fail and LF347 has been bought back not long later and assemble LF347, machine can working properly.

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