MultiSonic220 MIG-Dead Live Case

Case Setup

Model: MultiSonic220
Incoming complaint: "MIG is dead, but stick seemed okay last time."
Arrival condition: the machine arrives with a spool gun, standard MIG torch, loose polarity connection, and no clear report of which setup was last used
Hidden trap: the trainee must not let flashing-light stories or accessory clutter pull the case into internal repair too early

Trainer Prompt

Use this intake statement:

"Customer says stick still ran, but MIG would not do anything. They also mention the panel flashed earlier in the week, so they think the machine is dying."

Only reveal these if the trainee asks:

the spool gun was installed for an aluminum job before the complaint
the standard torch was packed loose in the case
nobody documented the actual polarity or trigger setup when the complaint happened

Allowed Document Flow

MultiSonic220 fault workflow router
MultiSonic220 measurement card
MultiSonic220 parts substitution card
MultiSonic220 board opening map only if base MIG still fails stripped down
MultiSonic220 guide

Trainer Injects

If the trainee goes after the flashing lights first, remind them the complaint is MIG-only.
If the trainee strips the setup correctly, reveal that the spool gun trigger was left connected earlier.
If the trainee wants internal access before proving base MIG, ask what the healthy stick result already proved.

Pass Markers

keeps the case in the MIG-only branch first
proves polarity, process selection, plain torch path, and accessory separation before internal escalation
treats flashing-panel history as secondary evidence until the base process is bounded
uses another healthy process as evidence without over-reading it

Automatic Fail Conditions

opening the machine before proving base MIG stripped down
blaming the base machine for a spool-gun or setup-path complaint
mixing panel-history evidence into the first branch before process isolation

Debrief Focus

a mixed-accessory arrival is designed to tempt premature complexity
the right move is to simplify to base MIG and prove what the healthy process already tells you
process isolation is not optional on multiprocess units

Companion Docs