Klipsch KSW15 plate amp repair. - diyAudio
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Old 22nd July 2014, 08:55 PM   #1
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Default Klipsch KSW15 plate amp repair.

Amp has some sort of problem.

When the amp is in the off position it will thump at random intervals. Maybe every 30 seconds or so. When the amp is turned on the thumping stops but does not play audio.

Can anyone offer any help and/or troubleshooting for this amp?

Fuse is missing in photo, but yes, it was installed when testing.
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Much higher res photos are available if they will help.
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Old 24th July 2014, 01:21 AM   #2
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Man I would not trust that amp plugged in for very long. I don't know off hand what the problem is. I would check parts for excess heat while plugged in, on or off. Check DC voltage on the output of the board that the power cord comes into. Anything? Move on to the three big black wires on the outs of the other boards. What year is this amp from?
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Old 24th July 2014, 01:55 AM   #3
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Looks like a couple burnt resistors in the bottom picture. Fourth to the left of the right trim pot and top left,second one in. Rust isn't a great sign either. I see some 99 date codes on one of the circuit boards. Those were the days of the counterfeit capacitors. You should likely go through all the resistors and see if they are still close to spec and check all electrolytic caps to start. Almost sounds like some kind of RC circuit happening when it's off. There may be corrosion on the wipers on all the trim pots too.
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Old 24th July 2014, 02:17 AM   #4
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That supply looks an awful lot like a car amp. Looks like rectified 120VAC. Seems kind of scary to have on uninsulated 1/4" blade connectors.
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Old 24th July 2014, 03:29 AM   #5
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Wow, good eye.

There appear to actually be 3 burnt resistors on that board. One was hiding in the corner.
Probably no way to know what value they were without a service manual, right?

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Old 24th July 2014, 04:39 AM   #6
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I can check resistor values but for the capacitors i would need to remove them from the board and check with an ESR meter right? Which i dont have.

Would it be advisable to replace the burn resistors and try it out? If i can somehow find out what value they are/were.
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Old 24th July 2014, 11:21 AM   #7
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There are many cheap ESR Cap checkers that can be used in circuit. They work fairly well unless something low resistance or another cap is paralleled with the cap. Usually you can figure out what the resistors used to be by looking at the other channel. No such luck here obviously. The burnt ones will likely be fairly low resistance.
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Old 24th July 2014, 03:15 PM   #8
Vostro is offline Vostro  South Africa
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Cheap ESR meter is not something I can find in my country..
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Old 24th July 2014, 04:08 PM   #9
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Quote:
Originally Posted by Vostro View Post
Cheap ESR meter is not something I can find in my country..
I found a home brew schematic for one. Building an ESR Meter
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File Type: jpg 555-esr-meter.jpg (53.3 KB, 18 views)
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Old 24th July 2014, 04:16 PM   #10
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wow, just checked ebay. they have homebrew looking prebuilt ones for less than $20. i hate when there are so many options, i have no idea which one to pickup!
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