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Old 3rd October 2011, 04:44 PM   #1
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Default Punch 200ix

Hello everyone.

I have a punch 200ix that had a fried power supply and a channel with 2 shorted outputs. I repaired the power supply and the channel.

The amp plays great and sounds great for hours on the bench with no issues.............but

When you power up the amp with no RCA signal it draws current and the repaired channels starts to get warm, especially R157.

Why would the amp be fine with a signal hooked up and not fine without a signal hooked up?
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Old 3rd October 2011, 06:38 PM   #2
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Do you see any oscillation on the speaker output terminal for the channel heating up?

What's the board number? I think there are at least 3 different versions.
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Old 3rd October 2011, 07:59 PM   #3
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Quote:
Originally Posted by Perry Babin View Post
Do you see any oscillation on the speaker output terminal for the channel heating up?

What's the board number? I think there are at least 3 different versions.
Board number PC-0776-C

Do you mean view the channel through the scope? I dont think I have viewed oscillation before and not sure what I am looking for. What settings do you reccomend on the scope?
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Old 3rd October 2011, 08:11 PM   #4
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2ms and 10v/div. Look at the drain of the power supply FETs at that setting. It will be nothing more than a rectangular haze. If the amp begins to oscillate, it should look similar.

I have photos of a 766 but not the schematic diagram.
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Old 3rd October 2011, 08:17 PM   #5
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Assuming you want me to do this with no signal or load present?

If so then there is no ocsillation.
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Old 3rd October 2011, 08:26 PM   #6
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Do it whenever it draws current and the repaired channels starts to get warm.
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Old 5th October 2011, 02:27 AM   #7
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Found a few bad BJT's the amp is running like a champ so far keep you posted. Thanks Perry.
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Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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