Update
MIH turned up trumps :clapping: Manuals turned up, lots of head scratching ensued :confused: Some conversations with the Electrician at work lead to a systematic approach to tracking down where I lost the trigger signal.
On the PCB there are 2 timers. At this time it looks like...
Thanks for the leads :clapping:
MIH have a circuit diagram/parts list for this model and also a user manual but for the 180. Both copied from the original and posted for very reasonable price.
I'll get these and then do some more checks to confirm what I already suspect.
Just out of...
Yes the numbers on the wires are great (especially when your colour blind LOL) I can follow the wires and in the majority of cases understand what's happening at the ends. I'm creating a list of wire numbers and what each end connects to. I may then do the PCB as well if I cannot get a diagram...
No worries, about making sure the logic has been checked through. Ibelled through the Torch trigger using the multimeter on audible resistance setting.
No bell until trigger pulled.
Checked agian at the wiring between the europlug and the PCB. Seems ok.
Going to see about a...
If the relay is the big switch for the contactor and the gas etc would the signal from the trigger be the thing that gets the relay to operate? Looking at the PCB this could be possible!
If so then the voltage that goes through the trigger that could be the problem?
If this is correct...
Rubber gloves wellies and a healthy dose of panic helps keep my fingers away from anything that could give me a hair raising moment :o doesn't stop the worry that I'm gona fry something on the PCB though.
This is hopefully a better photo of the PCB. If there's a fuse on here I don't know where. All Items have locations labelled ie D108, R112, TR01 hence my guess earlier about diodes, resistors and triac's. Nothing with an F## or that to my mind looks fusey.
I'll strip the PCB back off and...
Thanks for the link to MIH - I'll try calling them tomorrow (Monday).
Checked the supply to the Semikron item - I have 24vac going onto the board and 24vdc coming out of the Semikron item.
Tried the suggestion of shorting the europlug trigger points - no response.
Thanks for the feedback so far and the link to potential manuals. Unfortunately when I've tried doing on-line searches for this it comes up with the 140-1 or 141 which are physically different. Seems a manual/circuit diagram are rarer than chickens lips :vsad:
Internet search fetches the...
I don't thinks there's either a fuse or a transformer on the PCB. Diodes, resistors, a relay, some triacs?
The only thing on the PCB (Between the Connector block) that may be a 24vac supply is the Semicron item. This looks like it's an ac to dc unit though.
Madkayaker:-
I have what looks like 4 transformers in the base of the welder. The 2 that are visible in the photo above, the one to the right has what I'm guessing are multiple tapping points. Any suggestions on where to look or is it a case of putting the meter on and see what I get?
There...
Yes there's A1 and A2 moulded into the cover next to the terminals.
Not getting a voltage across the coil.
Out of curiosity, pushing the contactor manually with the set on, doesn't do anything obvious other than a slight dip in the lights in the shed.
Resistance across the Transformer (middle, bottom of photo) 0.8 ohms
The contactor shows as open circuit on first 3 contacts from the left except when manually pushing the contactor closed.
4th from left has NC printed on so I'm guessing that this is normally closed as this bells both when...
Thanks for the quick reply.
Pulling the torch trigger doesn't activate anything. The contactor doesn't pull in as I'm expecting, no gas etc.
Could you point me to where I check the primary windings?
Hello,
I have an old Murex Tradesmig 140 which has been stored for about 20years and was working fine when it got stored.
Info on the label at the rear of the welder TM140, Pt No. 1198245, T301-0015
The welder now doesn't work. The fan runs but pulling the torch trigger doesn't...