I doubt that Jameco would be selling fakes ( knowingly) but you never know anymore
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
sanyo is not a cpmapny anymore and hasnt been for many many years..the last sanyo real stk was made about 20 years ago
anybody or any company who sells a new stock stk that is stamped sanyo or marked with a sanyo part# on it is just a fake knockoff period and are junk compared to the original sanyo made stk....go to youtube and search fake sanyo stk and you will see a guy who took them apart and see the difference.
U1 LM338T with R3 and R2 make up a 5V regulator no way it can do 5A with such a tiny heatsink, even 1A would cook it.
U2 7812CT makes up a 12V 1A regulator
U3 not in pics
I think there is no 42V reg, it was just the raw DC off the big filter cap?
Looks like a wire is missing if there is no big fat take off wire from the filter cap(+). There's two black wires (bridge rect. and load) but only one red wire (bridge rect.) musta been a copper thief lol
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
Looks like around a 44 volt regular based on what I can see. It should not be dropping much voltage and thus not dissipating that much power either. Nothing wrong with this regulator, except that the circuit prohibits it from self preservation if things go awry. LM338/LM317's usually can protect themselves from certain death - this circuit cannot.
Regulator will be damaged if it's only 1.4 volts on its output.
You still need to make sure that it's still not shorted.
Tried swapping the board with one of your other ones and kill those too? Then you'll know if it's shorted or not at least ...
yes there is only 1.4v at output connectors that should be 42v as was last time machine was used by me
i guess i will replace the tm338 and see what happens
i dont want to swap boards from my other machines and create a worse situation since they are both running fine..
im sure it can be fixed and im sure its a simple issue ..as long as the big cap has 45v then i know everyhting before it is working fine and there isnt much after it ..its possible when i was messing with the new potentiometer on the other board the new potentiometer was bad and created an issue / surge with electronics elsewere
yes there is only 1.4v at output connectors that should be 42v as was last time machine was used by me
i guess i will replace the tm338 and see what happens
i dont want to swap boards from my other machines and create a worse situation since they are both running fine..
im sure it can be fixed and im sure its a simple issue ..as long as the big cap has 45v then i know everyhting before it is working fine and there isnt much after it ..its possible when i was messing with the new potentiometer on the other board the new potentiometer was bad and created an issue / surge with electronics elsewere
thanks
I am going ask you something and do not want you to take this the wrong way but where did you get the information about hooking the potentiometer to this board and was it made to be done the way you want to hook it up
The other thing you can not run the LM338 at 45 volts ( maximum voltage is 40 volts) it is not designed to run at this voltage for very long you will fry it after a short period of time and if you heat sink is not big enough that is going to be a problem as well
Here is an example of what can go wrong with something that you have bought for a purpose and find out there are issues and it will not last very long because of the issue it has
Right now I have a battery charger for a tool that the charger has a design issue the switching transformer ( over heating ) is not big enough to push 3 amp like the manufacturer claimed it supposedly to be able to do so I have to decide how and what I am going to do to be able to use this battery operated air compressor that I just bought
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
I put board bsck on to test voltage regulstor voltages and within 1minute the lsrge blue cap exploded .
Power supply is trash
Im not sure what i dod wrong as this machine is same as other 2 but i really messed it up and now its going to be a huge expense..i may just scrap the machine.
as it's just a line frequency filter and a burned out lm338 you'll likely just damage the capacitor and nothing else. Maybe the rectifier or fuse. Much less damage than APFC SMPS primary capacitors blowing.
pics for "what not to do"?
BTW makes me sad when I see caps and equipment blown up this way Also makes me mad when people screw up equipment like this, including myself. I hooked up a 8mm video camera backwards by mistake and fried stuff. *sigh*
Also a quick search on mouser: a 75V 7800uF capacitor (1.75" diameter) costs $25 ... Others around that can cost up to $50 a piece or so. But yeah not cheap...
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