Millermatic 35 Repair Manual
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This is my first post, so forgive me if I make a mistake or two. I am generally very good at locating problems in things and fixing them. That is, in most things that are not electronically based. Here is my current problem.
I have a Millermatic 35 and a Millermatic 35s both of which I have been able to fix, mostly because the problems they had were mechanical in nature, old mechanical relays and contactor switches, etc. I have five buddies that own non-functioning Millermatic 35's. I have found several mechanical problems with them, and now believe the rest are electronically related. I have located schematics for them, and feel that with a little help from an electronics hobbiest can locate test points on the schematics to allow me to compare readings to my machines and keep all our machines functioning. I have basic knowledge of electronics (very basic) and have a digital multimeter. I can recognize schematic components, but have little knowledge as to following the flow thru the circuits.
Is there anybody willing to help identify test points (as many as possible to narrow down the problems) on my schemetics for touble shooting these machines? The Millermatic 35 was made in the early 70's. They were rated at 150 amps. Built like tanks and a lot are still in service. They were the first mig to contain the wire feed drive and the power supply in the same box.
I have uploaded (if i did it right) the MM35 and the MM35s. The 's' had the spot weld option, which only means that you can adjust the time trigger is energised before it shuts off automatically. I think the idea is to obtain a consistent burn rate.
Millermatic 35 and 35s welder. I have a Millermatic 35 and a Millermatic 35s both of which I have been able. Built like tanks and a lot are still in service.
Millermatic 35 Repair
Each trigger pull gives you one burn pulse. On the schematic for MM35s the spot weld board is at the top, fed by the bridge circuit of diodes D51, D52, D53, and D54. Click to expand.What we usually do is to walk you through the process a step or two at a time. If you just want general guidelines to fix 5 at once here are a few things to check. Power to the unit, per dwg the fan should be running. Power out of the transformer, looks like 3 sets of windings. There are circuit breakers on 2 of these, the third is the welding winding, no breaker, but goes to rectifier diodes.
I've seen the trigger circuits go bad in the liners. If you come back for help, let's keep the questions confined to 1 machine at a time, way less confusing for everyone involved.And to those trying to follow. Thanks guys for the comments.
Yea, guess I was asking for 'The Idiots Guide To Welders' LOL. It didn't occur to me that it might be impractical to try to do it that way. I guess i had better get one of the machines over to my place, and then start over with your help. I'll clean circuit board as suggested by shortbus and see what happens. I will post again once I get a chance to pick up a unit and do some symptom checking and a little basic troubleshooting (power problems, circuit breakers, etc.). Thanks again for setting me straight on the proper path to follow.
I will be back with a little more reasonable request for help.