MultiSonic220 MIG-Dead Drill

Drill Goal

• teach the trainee to keep MIG-only complaints out of shared power-source diagnosis until polarity and accessory paths are proven
• teach the correct order from measurement card to parts substitution to internal map

Starting Scenario

• Model: MultiSonic220
• Complaint: stick and TIG work, but MIG has no output and the operator reports flashing lights earlier in the week
• Arrival condition: a spool gun and a regular MIG torch are both in the case

Expected Document Sequence

1. MultiSonic220 measurement card
2. MultiSonic220 parts substitution card
3. MultiSonic220 board opening map only if the base machine still fails stripped down

Success Criteria

• the trainee says the first proof step is polarity connector and stripped-down base setup
• the trainee proves plain MIG before blaming the spool gun or main machine
• the trainee keeps flashing-panel evidence in mind without mixing it prematurely into the MIG-only complaint

Common Misses

• jumping to feeder or power-board failure while the polarity path is still unproven
• blaming the base machine for a spool-gun-only complaint
• opening the machine before base MIG and stripped-down process state are proven

Debrief

• The key lesson is that one healthy process is strong evidence. Use it.
• Internal opening is justified only after base MIG, polarity, and accessory paths are already bounded.