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2235 Transformer

bktheking

bktheking

Gitter Done!
Well my known dead 2235 purchase came in. Confirmed power switch it working, throwing a full 120V to the transformer, ZILCH coming out the other side. I ohmed it out and I get nothing. I suspect there is a fuse inside the transformer, diagram for a 2235b shows one. Anyone ever replace the fuse inside? I've removed the transformer and got it apart on the bench. Advice?
Thanks
 
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I pulled apart a 2245 transformer once. The fuse was so buried, that I had to destroy the transformer to get to it. It was blown any ways.

You would probably have to have the transformer rewound to repair it.
With a fuse on the outside.:yes:

Looking for a unit being parted out is your best bet.

Rob
 
Ya I just had it apart, it's cooked and everything is so brittle only a pro could repair it.
Now to find a used one, hmmm.
 
Tell me something EW, you must run into this. There are companies like toroid that manufacturer replacement tranny's for amp and my issue is i don't know the specs for a 2235 secondary output. How would one purchase a replacement without knowing the voltages?
 
There is a guy selling a faceplate on e-bay, and he says he has other parts. You may want to ask him if he has the transformer.

Rob
 
bktheking said:
Tell me something EW, you must run into this. There are companies like toroid that manufacturer replacement tranny's for amp and my issue is i don't know the specs for a 2235 secondary output. How would one purchase a replacement without knowing the voltages?
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Not gonna happen. If you had some rare, very valuable amp or receiver, then it would be worth what I call 'heroic efforts' to find some way to bring it back to life. But with a 2235 (which is nice, but nothing earthshaking), your options are pretty much limited to finding someone parting one out, or removing the transformer and seeing if someone like Gary can get it working. Shoehorning some third-party unit into that receiver is the maximum effort solution, and I'd not consider it.
 
So essentially if you can't find someone to fix a transformer or a good replacement you're screwed, doesn't sound like a good start to a fun hobby. :banana:
 
where the wires go into the primary side are there 3 connections under tape ? if so 2 of them might the legs of the fuse . i just fixed a transformer like that the fuse was well buried in there but the wires were easy to get to .dont get confused if its a centre tapped primary though
 
So is this a 2235 or 2235B? Got any pics? Is this the one from Georgia or New York?

Any evidence of other mayhem on the power supply or amp PC boards, or anything else like bulging or damaged caps, or fluids that fell into the receiver?

As stated above, something caused the transformer to fail, and before you start digging for a tranny, you need to at least have a good visual inspection to see if there's going to be more troubleshooting and $$$ spent. Then you have to decide if its worth it.
 
mech986 said:
So is this a 2235 or 2235B? Got any pics? Is this the one from Georgia or New York?

Any evidence of other mayhem on the power supply or amp PC boards, or anything else like bulging or damaged caps, or fluids that fell into the receiver?

As stated above, something caused the transformer to fail, and before you start digging for a tranny, you need to at least have a good visual inspection to see if there's going to be more troubleshooting and $$$ spent. Then you have to decide if its worth it.
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2235 from Georgia- I have pics, the seller said it was clean, just didn't power up, it's filthy, looks like a smoker owned it. It's definetly the fuse in the tranny, I dug it out, it's open. Some of caps on the power board are toast. Just making dinner now, will post after. Not sure why the fuse went or what caused it, I can only suspect overheading but there are no signs of burning up, thermal fuses can fail from age. I temp soldered a wire to test, it now has continuity through the primary. I so want to replace it and clean up the amp and fire it up.
 
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petehall347 said:
where the wires go into the primary side are there 3 connections under tape ? if so 2 of them might the legs of the fuse . i just fixed a transformer like that the fuse was well buried in there but the wires were easy to get to .dont get confused if its a centre tapped primary though
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The experts say don't replace the fuse, I put a thermal fuse in a hair straightener and it worked for 2 more years. I guess it could be weak from age, did the one you replace survive?
 
bktheking said:
The experts say don't replace the fuse, I put a thermal fuse in a hair straightener and it worked for 2 more years. I guess it could be weak from age, did the one you replace survive?
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i have done a few now i just wire without it i know its wrong and a fire risk but only on my own equipment if i do it for anyone else i will change the thermal fuse or let them be aware .i always test the current draw to see if there might be a fault that caused it .i think they wear out i have come across lots that have gone in car battery chargers and a few in amps
 
Your picture looks a lot like the 2245 I repaired that had a bad transformer. Someone spilled a mud slide into it. Looks like liquid got in yours as well.

Rob
 
Yuppers, that's what i'm thinking. I just tested the rectifier, it passed. Looking at the fm if board it looks like a resistor is gone right off the board, I can see the leads on the backside but it's gone.
 
My previous post about t-former replacement was predicated on the internal fuse being buried so deep that it was inaccessible (most are buried so deep that there's about no way to get to them without destroying the transformer...or allowing it to be repaired by someone with the proper equipment). Back when this unit was made, US and European units did not require the thermal fuse in the transformer, but CSA requirements were tougher than everyone else's, thus units sold in Canada had to have the thermal fuse installed in the transformer.

Why it blew is another matter... nuisance blowing of these fuses is about unheard of because of the way they are constructed. I'd double-check the value of the regular mains fuse, and power it up on a dim bulb tester at a minimum.
 
I just bit the bullet and downloaded the proper 2235 manual, I sent it to AK for the database. R278 is a blank, so no resistor fell off :)
 
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