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Old 26th February 2009, 06:07 AM   #11
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You seem to have some more defective capacitors. C102, 103, 202 and 203 (guessing 202 and 203, they're not shown on the schematic) are the ones you need to check. Each cap should have the same voltage on each of its terminals. If it has 0v AC on one terminal, it should have 0v AC on the other terminal. If it has 0.5v AC on one terminal, it should have 0.5v AC on the other terminal.
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Old 26th February 2009, 10:36 PM   #12
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you were definately right on , c202, c203 had leaked on the board and replaced them and it works like new.

Thanks again for helping.
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Old 13th March 2009, 10:11 PM   #13
gsg529 is offline gsg529  United States
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Smile Resistor values for Punch 100??

Followed this thread because it is similar to the issue I am having with my Punch 100 DSM. In short R2, R17 and R231 are running very hot. (Interesting side note, R131 is the identical resistor to R231 on the right channel and it is running very cool.)

It appears that both R2 and R17 may have already failed. R2 returns an open short (infinity) when tested with a multimeter. I cannot read the banding because it has faded due to excessive heat. I can only make out Digit 1 and Multiplier values which appear to be Brown and Gold respectively.

R17 returns a value of 6.2K ohm when tested with the multimeter. This does not seem right because the banding is Brown, Black, Black, Gold, which suggests a 10ohm.

R231 tests OK, but is running quite hot compared to R131. This is a 220 ohm resistor.

Can anyone tell me what the values for R2 and R17 should be so I can replace them?

Without any speakers conntected to the amp or load of any sort, currently it turns on momentarily (with a very dim remote LED light) and trips my power supply's protection circuit within 10 seconds. The PS is rated for 3amp draw.

Any insights or shared schematics would be greatly appreciated. This amp has been great to me for over 15 years and I would love to resurrect it! Thanks in advance!
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Old 13th March 2009, 10:28 PM   #14
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R231 is probably running hot because you have DC on the speaker terminals.

R2 is 39 ohms.

R17 is 10 ohms.

You probably have shorted output transistors.

Email me if you want the schematic. It only shows ~20% of the components but it's better than nothing.

babin_perry@yahoo.com
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Old 19th March 2009, 03:41 PM   #15
gsg529 is offline gsg529  United States
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Thumbs up Gettin' there

Replaced R2 and R17 - amp is stable and no longer tripping circuit breaker.

R231 is still hot but checking OK when tested.

Tested DC voltage across left channel output and receiving 30 volts. Right channel has no DC reading.

I'm pretty certain Q206 and Q207 have failed. Receiving a short when tested. Q203 and Q204 are testing OK.

I suspect the next step is to replace the FETs and retest.

Have I missed anything? And is there anything I should keep in mind when replacing them? Thx.
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Old 19th March 2009, 05:34 PM   #16
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If 206/7 are shorted, measure the resistance between legs 1 and 2. The one with the lowest reading is likely shorted and the other is likely OK. Remove or cut out the shorted one and see if you still have DC on the output terminals.
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Old 19th March 2009, 06:31 PM   #17
gsg529 is offline gsg529  United States
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I undertstood you to mean Leg 1 as being the Gate of the FET and Leg 2 to be the Drain.

When tested, Q207 is 33.3 ohm, Q206 is 13.2 ohm

Just for kicks, I tested the resistance between the Drain and Source, and they both return 12.2 ohms.

I'll remove Q206 and test for DC.
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Old 20th March 2009, 02:09 AM   #18
gsg529 is offline gsg529  United States
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Perry,
Ran into a snag. Pulled Q206. Didn't get a chance to check for DC because when I went to bench test the power supply began tripping again? Tested it several times and each time R17 is red hot, to the point that I saw smoke from it just before the breaker tripped. The resistor is still checking out OK tho.

So, I took readings on all of the Power Supply FET's and I will forward the results to your private address. Sigh. Thx.
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