Alankesaussie
New Member
- Messages
- 7
- Location
- East Gippsland Australia
Seasons greetings all
I am hoping for some diagnostic direction with an issue or two.
My old MIG which is a Transmig 180SE single phase 240Volt has just started acting up.
Scenario as follows it first started tripping the 25Amp circuit breaker in the garage this proved to be a dead short in the machine in one of the main copper coils the flash was visible to the naked eye when cycling the torch trigger after removing this component I found where it was arcing and I discovered the insulation had disappeared from this point on the connection I slid on two layers of heat shrink onto this part of the coil and re-installed, this immediately rectified the problem however then after a short while it stopped feeding wire I tested the feed motor on 12Volts DC and no problems there all good the contactor appears OK there is 27Volts to the PCB but no DC power to the wire feed motor (tested at the feed plug) with a multimeter
I removed the PCB and cleaned with contact cleaner and gently blew it out with comp air a close inspection with magnifiers did not reveal any bulged capacitors or any evidence of corroded or loose soldered joints there is a bit of heat discolouration on what I believe to be a ceramic looking resistor
Note the PCB on this machine was replaced maybe 10 years ago
Where to from here? any help appreciated I know basic circuitry but no really how to run diagnostics on a PCB
Best Regards
Alan
I am hoping for some diagnostic direction with an issue or two.
My old MIG which is a Transmig 180SE single phase 240Volt has just started acting up.
Scenario as follows it first started tripping the 25Amp circuit breaker in the garage this proved to be a dead short in the machine in one of the main copper coils the flash was visible to the naked eye when cycling the torch trigger after removing this component I found where it was arcing and I discovered the insulation had disappeared from this point on the connection I slid on two layers of heat shrink onto this part of the coil and re-installed, this immediately rectified the problem however then after a short while it stopped feeding wire I tested the feed motor on 12Volts DC and no problems there all good the contactor appears OK there is 27Volts to the PCB but no DC power to the wire feed motor (tested at the feed plug) with a multimeter
I removed the PCB and cleaned with contact cleaner and gently blew it out with comp air a close inspection with magnifiers did not reveal any bulged capacitors or any evidence of corroded or loose soldered joints there is a bit of heat discolouration on what I believe to be a ceramic looking resistor
Note the PCB on this machine was replaced maybe 10 years ago
Where to from here? any help appreciated I know basic circuitry but no really how to run diagnostics on a PCB
Best Regards
Alan
