klipsch/Bash rw-10d amp broken. need guidance

senate · 09:36 PM

Hello, I would like some help tracking down the issue with this amp. Got it from a friend for free. He doesn't know how it stopped working. hehe. So I opened it up and visibly tracked down two torched resistors and one torched transistor on the Linear Board. The fuse is intact and not blown. I managed to find the schematics for the rw-10 (10d has a digital display for functions). The torched resistors are next to the linear board CD- And according to the schematics this should be recieving 4.5 vdc without a signal, but is getting around 65 vdc.

I'm a newbie at this. Anyone want to lend a helping hand and offer some guidance as to what could be causing the crazy voltage ? i have the full schematic on hand but file size is too large to upload.

senate · 3rd August 2011, 09:35 PM

Better pic of the linear board schematic.

senate · 3rd August 2011, 11:19 PM

bump. guess i'm looking for the electronic component that would bring vdc down on the power supply board.

senate · 4th August 2011, 01:21 PM

actually i don't know what i'm lookin for hehe. I had a hunch it was something not bringing down the DCv after the power transformer, but now i'm thinking it could also be something not bringing ACv down before the transformer. Hope that makes sense.

senate · 8th August 2011, 09:30 PM

Okay so i've narrowed it down to the power transformer. Now i need to replace it. I've tried searching but i cannot for the love of me find this transformer anywhere. it's in the picture above with the name Indigo on it. Schematic description is "XFMR, POWER EER35L 100V". No clue what the EER35L means... Anyone know where I can purchase this ? i've tried digikey but i don't think i have the correct keywords.

leadcoma · 10th August 2011, 01:54 AM

The problem isn't the transformer. This is a Class D amp powering a Class AB amp. CD+/- is the output of the Class D amp. The Class D MOSFET usually shorts from D-S and that tops out the CD+\- voltage and burns the centering resistors as you've described.

Find the Class D MOSFET and replace it. It is not in the schematic you posted. The Class D driver circuit may also be damaged so you'll to check that before you fire up the amp.

Good luck!

senate · 10:14 AM

Thanks for the reply leadcoma, but I made the wrong move and disassembled the transformer already :O . So beside the mosfets any idea who might sell such a transformer ? I tried Klipsche and they only offer replacement amps. Thanks again

leadcoma · 10th August 2011, 02:38 PM

I hate to be the barer of bad news but you won't find that transformer in any store. 99% of switching transformers are custom designed for the application and your transformer is definitely in the custom designed/manufactured category. It's not stocked as a service part either because they rarely fail.

If you made note of the transformer winding specs when you disassembled it, you could rebuild the transformer.

senate · 10th August 2011, 03:19 PM

any news is good news. I'll keep an eye out for any similer broken amps to salvage

. Thanks again for you help.

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3rd August 2011, 11:19 PM	#3
senate diyAudio Member Join Date: Jul 2011	bump. guess i'm looking for the electronic component that would bring vdc down on the power supply board.

4th August 2011, 01:21 PM	#4
senate diyAudio Member Join Date: Jul 2011	actually i don't know what i'm lookin for hehe. I had a hunch it was something not bringing down the DCv after the power transformer, but now i'm thinking it could also be something not bringing ACv down before the transformer. Hope that makes sense.

8th August 2011, 09:30 PM	#5
senate diyAudio Member Join Date: Jul 2011	Okay so i've narrowed it down to the power transformer. Now i need to replace it. I've tried searching but i cannot for the love of me find this transformer anywhere. it's in the picture above with the name Indigo on it. Schematic description is "XFMR, POWER EER35L 100V". No clue what the EER35L means... Anyone know where I can purchase this ? i've tried digikey but i don't think i have the correct keywords.

10th August 2011, 01:54 AM	#6
leadcoma diyAudio Member Join Date: Jan 2009	The problem isn't the transformer. This is a Class D amp powering a Class AB amp. CD+/- is the output of the Class D amp. The Class D MOSFET usually shorts from D-S and that tops out the CD+\- voltage and burns the centering resistors as you've described. Find the Class D MOSFET and replace it. It is not in the schematic you posted. The Class D driver circuit may also be damaged so you'll to check that before you fire up the amp. Good luck!

10th August 2011, 02:38 PM	#8
leadcoma diyAudio Member Join Date: Jan 2009	I hate to be the barer of bad news but you won't find that transformer in any store. 99% of switching transformers are custom designed for the application and your transformer is definitely in the custom designed/manufactured category. It's not stocked as a service part either because they rarely fail. If you made note of the transformer winding specs when you disassembled it, you could rebuild the transformer.

10th August 2011, 03:19 PM	#9
senate diyAudio Member Join Date: Jul 2011	any news is good news. I'll keep an eye out for any similer broken amps to salvage . Thanks again for you help.

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