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Ever been so mad at a project you wanted to just smash it into the concrete?
coppercone2:
Dynasty 200dx I have a useless service manual I need like component level lol, I replaced maybe 50 parts on it bc of various burns n stuff. Milled and glue charred pcb too. It’s why man invented the hammer like 2001 space odessey
Stuck with overtrmp error 5 . I replaced the big caps that were bulging a little (measure fine on lcr) and it booted once where I can control the panel. The thermistor readings are fine with dmm . Would like to test em with a mugger to earth though
coppercone2:
TO give better details
1) -5 and a stuck voltage/current value alternate on the front panel display (I assume this means error code #5, temperature error)
1a) the sensors measure OK on a DMM
2) the unit makes a buzzing noise that coincides with the display (the pitch of the film can inductor on the main board PCB whine changes when it shows -5 and when it shows the voltage/current value, so it alternates between say a 40 and 50 hz bzzzt
3) the unit had most of its semiconductors replaced, I suspect its the inverter controller card (including big IGBT and the rectifier). This one has alot of MOSFET cascodes or something, I had to repair burn damage here
4) I repaired other damage to the inverter power supply on main board (some how I think a small ceramic cap was causing a flyback diode to explode on a 20V rail?)
5) repaired damage to MCU board (tvs diode)
6) found one loose connector on the output
7) Replaced the main electrolytic caps (1400uF monster caps). They were swollen on top, but after I removed them, very painfully, I measured them OK at 100, 120Hz and 1KHz on DE-5000
7a) This is the last repair I did, last night. When I turned it on after the repair, it displayed error code and faintly smelled of burned semiconductors. I turned it off and turned it back on, and displayed the code but when I hit a button it actually responded and let me adjust the current, and all the switches worked and gave me front panel feedback. When I turned it off and waited and turned it back on, it was back to the -5 error. I think I am playing whack a mole with the inverter card.
I also I think I checked everything else, replaced some power resistors, and attempted to run it with a disconnected solenoid, fan, thermistor, etc. It appears its the thermistor on the rectifier that its complaining about, but when I measure that with a DMM on the input to the MCU board, it reads OK.
I think I am playing whack a mole with the fucking cascode on the inverter control board, that had severe damage, so I bought a replacement PCB for this today. Last gamble? There is like 20 4pin mosfets there (HV), and a bunch of op-amps and 74 series shit, that I all replaced multiple times, but I had it go up a few times in the last year (I think its only been a little over a year, not two years, its a blur) where my procedure is to replace all the fets before trying again. The only thing I noticed is that there is one 74 series gate running at 100F (the others are at 80), and its near the fets. I had the mill the PCB out near the fets and redo it with rivets and epoxy. I suspect there is something more going on here. I just wanna get rid of this compromised board.
I also have it running through a variac set to like 105V (20A variac) that is turned on, then the welder is turned on, so I don';t need to deal with a 800V rail.
But I also though this over a little, you know.. the board replacement sucks but its a tool that has high voltage in it and I need to hold it in my hands, its not the worst idea in the world to not use dodgy PCB (its like a fiberglass bumper repair).
RJSV:
Think of this self-control aspect, even though I'm sure you don't need a lecture.
Adults can maybe mitigate the aspects of losing control, for couple seconds,...but
I've watched an attentive MOM go ballistic on similar issues, when an upset kid tried pulling up nearly every (expensive) front yard decorative bush.
"Taking out your frustrations, on another living thing...",
but similar response, when kid was smashing broken toy, MOM pointing out that toys were a loving gift and so should be left out of some grief frenzy...
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(Unless it's some TV toss drama show-off)
thermistor-guy:
--- Quote from: Conrad Hoffman on May 23, 2023, 03:04:29 am ---Ever been so mad at a project you wanted to just smash it into the concrete?
--- End quote ---
No, but the closest I've been: glaring at an Epson inkjet printer that refused to scan to a remote PC, because one ink cartridge was empty.
And sitting nearby, was my neatly arranged storage tub of hammers and hand axes ...
TERRA Operative:
--- Quote from: coppercone2 on May 24, 2023, 05:09:11 pm ---Dynasty 200dx I have a useless service manual I need like component level lol, I replaced maybe 50 parts on it bc of various burns n stuff. Milled and glue charred pcb too. It’s why man invented the hammer like 2001 space odessey
--- End quote ---
I have this manual on my NAS, it might be what you have already though? Once I remember the Miller partner portal login (it's been 10 years...) I'll see if I can find more.
https://drive.google.com/drive/folders/1AbmCZZFmvnaZQ04w5Bh-TJpSg_JAkeDf?usp=sharing
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