Punch 200ix

seankane · 3rd October 2011, 04:44 PM

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?

Perry Babin · 3rd October 2011, 06:38 PM

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.

seankane · 3rd October 2011, 07:59 PM

Quote:

Originally Posted by Perry Babin

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?

Perry Babin · 3rd October 2011, 08:11 PM

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.

seankane · 3rd October 2011, 08:17 PM

Assuming you want me to do this with no signal or load present?

If so then there is no ocsillation.

Perry Babin · 3rd October 2011, 08:26 PM

Do it whenever it draws current and the repaired channels starts to get warm.

seankane · 5th October 2011, 02:27 AM

Found a few bad BJT's the amp is running like a champ so far keep you posted. Thanks Perry.

3rd October 2011, 04:44 PM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	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? __________________ Pyramid 46 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

3rd October 2011, 06:38 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

3rd October 2011, 08:11 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

3rd October 2011, 08:17 PM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Assuming you want me to do this with no signal or load present? If so then there is no ocsillation. __________________ Pyramid 46 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

3rd October 2011, 08:26 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do it whenever it draws current and the repaired channels starts to get warm. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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5th October 2011, 02:27 AM	#7
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Found a few bad BJT's the amp is running like a champ so far keep you posted. Thanks Perry. __________________ Pyramid 46 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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