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Old 7th June 2009, 02:16 PM   #1
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Default punch 100 dsm question

I replaced the outputs on this amp and I am still getting about 7 volts dc on the left channel output.

My question is would anything on the driver board cause this?
If so where on driver boards should I test?
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Old 7th June 2009, 05:01 PM   #2
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Do your driver boards have all of the resistors on one side and the transistors on the other side or are they mixed?

Is it drawing excessive current?
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Old 7th June 2009, 09:49 PM   #3
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resistors on one side transistors on other.

it draws a good bit of current .
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Old 7th June 2009, 10:55 PM   #4
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Turn the bias pots fully counter-clockwise to see if the current draw decreases.

Check the parts highlighted on the following images.
http://www.bcae1.com/temp/db1.jpg
http://www.bcae1.com/temp/db2.jpg
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Old 12th June 2009, 04:11 PM   #5
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Replaced the transistors on the driver board along with the resistors.
Pots are turned all the way down.
The dc voltage in not 7 volts anymore it is less than 1 volt.
The amp still draws excessive current.
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Old 12th June 2009, 05:26 PM   #6
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Clamp the transistors and power up the amp for just long enough to measure the DC voltage across the large 0.1 ohm source resistors. Which ones have more than 0.000v across them?

Do this with no audio. If you have a 2 ohm current limiting resistor, insert it in the B+ line.
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Old 12th June 2009, 06:53 PM   #7
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Dc voltage is gone on left channel.
None of the source resistors have more than 0.000 on them.

amp still draws lots of current when remote voltage is applied
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Old 12th June 2009, 06:57 PM   #8
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How much current?
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Old 12th June 2009, 07:41 PM   #9
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My multimeter is not letting me check amperage.

If I turn the power supply of and on a few times it turns the amp on, If I turn it off then back on only a few seconds after it was working it turns right on.

When I wait a few minutes to turn it back on is when I have to toggle it of and on.
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Old 12th June 2009, 08:04 PM   #10
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What are you using for a power supply?

If it's an AC-DC converter, what's it's amp rating?

How do you know it's pulling excessive current?
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