Fender Champion 110, upc1188

[drummer_Dave]

Hello all,

So here's my dilemma, hope someone can help

I recently acquired a Fender Champion 110 guitar amp, that didn't turn on. After i tore it apart and couldn't see any burnt components i needed to isolate the power supply from the rest of the components so i removed all 5 op amps and put dip sockets in. now the only thing connected to the power supply was the upc1188 20watt power amp chip i powered the unit up and the transformer started buzzing (from what ive found this usually happens when you ground a tranny output) so i shut of the amp and found that one of the 1n4003 bridge diodes was conducting both ways, so i replaced it and the unit powered up fine. Great, or so i thought

I still dont get an output signal, i found a copy of a Fender champion 30 schematic ( http://www.manualnguide.com/dl/10166/ )which is almost the exact same (except for the power out chip which id a tda1514). so basically I am sort of at a point were i think i need a upc1188 chip (or the proper schematic). Does anyone know where i can get one or 2 of these chips? or i also have a second option. I could always build a kludge board (26v rails) with a lm3886 chip i have lying around and interface that with the existing circuit.

Any help in sourcing parts or schematic would be greatly appreciated.

Dave

[drummer_Dave]

well after i reverse engineered the power amp section and figured out what was wrong I ended up finding s an electrolytic cap in the signal path was dried up. Who uses electrolytic in audio signal path??? urg) i then found the schematic of the whole amp tucked inside the amp. so if anyone need the schematic email me and i will scan and email it.


Dave

[Nigel Goodwin]

Originally posted by drummer_Dave
Who uses electrolytic in audio signal path??? urg)

Almost every solid state amplifier ever made?

[Geek]

Hi Dave,

Originally posted by drummer_Dave
...an electrolytic cap in the signal path was dried up. Who uses electrolytic in audio signal path???...

Sounds to me like you need to join the tube amp crowd

Cheers!

[drummer_Dave]

I agree geek, once i finish off my digital matrix mixer i plan to do a nice 15 - 20 watt tube amp (never dealt with tubes before so im sure there will be a lot of searching in this site) fortunately a guy i work with (who is 70+) has a whole pile of tubes and transformers i can have, i just have to sort through them, but thats a whole nother thing for another day

Dave

[head_spaz]

Does anyone know where i can get one or 2 of these chips?

I see that you've already fixed your amp, but if you still want to pickup
a few spare ICs, tubesandmore.com stocks them.

Look under the Solid-State-Devices / ICs / Fender category.

IC - ORIGINAL FENDER, POWER AMP PC1188H
Part Number = P-QPC1188H
2007 Catalog / page 68
Price USD = $10.25

[drummer_Dave]

thanks for the heads up head_spaz


Dave

[Kenda47]

Hi Dave

It looks like you solved your problem. I have been asked to see if I can repair my friend's son's Champion 110 but the amp is pretty fried in the output stage area and with no schematic I am struggling to know what the components should be.
You mentioned that you can e-mail a schematic for the Champion 110. If you still have one I would be very grateful.

Thanks for your help.

Cheers

Keith

[drummer_Dave]

yep i got the schematic at home, Ill try to scan it and email it within the next day or so if you can be patient...

Dave

[Kenda47]

Cheers Dave that would be great. Thanks alot. I notice you are thinking opf buildiong a valve amp. This is my forte so if I can help let me know.

Keith