Repairing Damaged PCB on CEMONT S1600 Welding Inverter: Missing Components

Hello.
The welder was standing in the garage and something heavy fell on it.
A printed circuit board is broken. There are also a few elements missing. I have not found the scheme for it although there are some similar solutions. Below photos.



As you can see, the LM339N is broken, the TL431C is damaged, some resistors are removed and some element together with the heat sink. Most likely, the voltage stabilizer - although I have not yet traced the diagram on the PCB so it's safe.
Would a good soul with this welder or scheme help me with the missing elements:
1. Missing stabilizer or power transistor.
2. Two missing resistors next to the broken LM339N. I also suspect that they will be some precise resistors.
3 Missing item over LM339N - most likely a capacitor because there was only one wire on the leg.
Here, in colorful ellipses, places after them


Will this welder require the oscilloscope to be started after inserting the missing elements? I have not dealt with the SG3525 so far, hence my doubts

Could you take a picture of the whole album? Or maybe the front panel? It seems to me based on the above that I probably never had such a welder.

Whole:
 

Rectifier block:


The rectifier bridge on the side wall has the inscription:
Facon BJ39 933

Sensor on the main rectifier bridge heatsink:


Motherboard:


In addition, there is also a potentiometer from the front panel and LED



If it's more accurate, I can give you something more.

Hello. I am a novice on the electrode - please be understanding. I will help with this electronics, I have two such PCB IGBT R2747 damaged in the device CEMONT TH 1600 and EUROTRONIC TIG 1501 (DCI) electronics the same plus HF, control from the front panel. I have a schematic pcb in the latest generation with a microcontroller.

Thank you very much for your answer.
I have found operating instructions for this welder. However, there is only a block diagram.
Link

A little bit like electronics is in this welding machine:
esquemas puma sx 35131
Link

This EUROTRONIC TIG 1501 (DCI) will probably be something like:
Link
or
Link
I have not checked yet whether the operational amplifiers work the same as in S16000

If I can, I would ask for a clear photo of the LM339N system and the surrounding elements.
There should be missing 4 elements that were lost after breaking the plate.
In the example photo of the whole CD I have marked the fragment in the yellow frame.

 

The biggest problem I have with missing 2 resistors
If there were any problems with uploading photos or files, please let me know.

Very similar electronics are also in the MAHE i-200 welding machine. Unfortunately, there are slight differences, especially in the upper part, which the author needs.

I have a problem how to send a photo PCB

According to this instruction.
https://www.elektroda.pl/rtvforum/topic2053101.html

https://obrazki.elektroda.pl/4690752200_1390592122.jpg

Thank you very much for your help. Now I will have resistors and dispelled doubts.
By the way, at first glance, this dark electronic capacitor next to 7815 is strangely swollen.
I do not close the subject yet, because maybe the welding machine will not start right away (which I would not want, of course)

Hi. This condenser over LM339N is 100nf / 63V. I put a drawing on the knee (photo) not fit with the photo PCB earlier. What some will laugh!?.

Because I was asked for a bit more information about this welder about it:

The front panel potentiometer has no additional elements mounted on it. What may give such an impression is a plastic mass. The middle leg is in the shirt. As you can see on the photo, the potentiometer is 10k and, according to my measurements, has a linear characteristic.

 

The output circuit is on five such transistors:
 

Transistors of the input circuit: (internal side)
 

(outer side)
 

I do not have a torque wrench to check the tightening torque (the force with which the bolts are screwed), but in all three radiators the screws were tightened loosely. I do not know if this is due to the operation of the system (heating-cooling of the heat sink) or whether it is the factory setting.

IREK21A Is a 1.58k-1 resistor % next to the stabilizer 7815 was read from the barcode or was it measured?

Added after 3 [hours] 53 [minutes]: < br />

 Edition:
I have looked at the Puma's SX35131 diagram and these "five output transistors" are double RURG3020 diodes.

Hello. The absence caused by damage to the router. The "idepopizze" elements were measured in the system. I checked today the resistor next to LM 7815 desoldered is 3.3k-1% next next to 10k-5% and the other two are 4.7k-1% .Z my photo is really hard to read! What is I surprised to see that they are loose!? As for professional equipment, the distance from PE is a frivolous solution. In the Polish ENEL 150 power transistors screwed to the radiator! In my cemont th 1600 probably this was the cause of the power level damage because one central igbt r4727 fired. The deformed laminate is known to have a temperature.

All screws on all heat sinks seemed to be screwed by hand (manually, that is, more tightly with fingers). When I finish it, it's more solid.

I had doubts about this 1.58k, because the colors did not match very well. 10k next to the colors looked ok. Probably soon I will throw here the scheme of this CD when I finish the patch.

Buying the original R4727 igbt can be a problem.

Hi everyone. My brother managed to get an Oerlikon / Citoarc 1600i
It switches on, but it makes a whistling sound, like an ultrasound when turning up the potentiometer of current. He opened it and could not see any defective part, nor any burnt part/area. He tried to weld but there seems to be no current coming out, only small sparks.
Any idea on where he should look on the boards?
Thanks,

Dodano po 1 [minuty]:

Hello, I have the same equipment and I need the values ​​of the 7 resistors at the bottom left of the diagram, the ones next to the triac bd138 , I think they are the only ones missing. In my computer they have all been burned and I cannot know the value. Thank you so much [quote="IREK21A"]Hi. This condenser over LM339N is 100nf / 63V. I put a drawing on the knee (photo) not fit with the photo PCB earlier. What some will laugh!?. [/quote]

It should help

thank you very much for your help. Now I'm going to buy all the components. although on my board the 6 transistors are different than those in your photos. mine are 12n60a4 but I suppose they will be equivalent to the R4727 that your board mounts.