Punch 40 DSM

seankane · 05:09 AM

Punch 40 DSM PC-0001-A REV A

I have a punch 40 dsm I am working on and it has no output. It came in with a burned up power supply. I repaired the power supply and all is well with that.

The amp is producing 46.1 vdc rail voltage

The op-amps have positive and negative voltage of 11.61 vdc on pins 4 and 8.

The regulators are out putting fine.

There is no DC on the bridging terminals.

I have clean audio on pins 1 and 7 of the op-amps. The capacitors on the input board dont seem to be leaking or smell funny.

The output fets are getting rail voltage but no audio signal.

I have clean audio on both sides of C202.

I have no audio on either side of C102.

Pin 1 of HB1 has +12 vdc

Pin 2 of HB1 has -12 vdc

One thing I thought I would mention:

HB101 pin 9: -3.104 vdc
HB101 pin10: -7.26 vdc
HB101 pin11: -10.85 vdc

These pins should all have 0.000 vdc

HB101 pin25: 0.000 vdc should have 3 vdc
HB101 pin28: 0.000 vdc should have 3.6 vdc

HB201 pin25: 0.300 vdc should have 3 vdc
HB201 pin28: -0.200 vdc should have 3.6 vdc

I dont know if this helps any but I am just wondering where I should look next?

Perry Babin · 17th November 2011, 04:56 AM

Does the bias control allow you to bias the outputs on?

seankane · 17th November 2011, 05:01 AM

NO neither channel will bias nor will the bias turn on either output.

Perry Babin · 17th November 2011, 05:14 AM

Do you have the negative 12v on R102?

seankane · 17th November 2011, 05:25 AM

Yes -11.95 vdc on both sides

Perry Babin · 17th November 2011, 05:56 AM

Did you replace the driver boards?

seankane · 17th November 2011, 05:59 AM

No not yet should I do so?

Also not 100% sure on the orientation of the new boards as they are a different revision and dont look the same. Both new and old boards having writing on them wondering if I should install the new boards with the writing on the same side as the old boards. The ones I will be using are the same as I sent you. Any tips for that?

Perry Babin · 06:23 AM

On the driver board, pins 4 and 5 go directly to the base and emitter of a transistor. That should give you the reference you need.

Correction. That's pins 4 and 5.

seankane · 17th November 2011, 06:26 AM

Quote:

Originally Posted by Perry Babin

On the driver board, pins 4 and 5 go directly to the base and emitter of a transistor. That should give you the reference you need.

Correction. That's pins 4 and 5.

Ok I was just going to ask that, got it. Thanks Perry. From what I have described does it sound like a possiblr driver board issue? If so Why would both boards be affected? Could the power supply failure have something to do with it?

Perry Babin · 17th November 2011, 07:02 AM

Yes. I'm assuming that you've checked the various resistors between the board and the outputs. The supply voltages are all seem to be OK. I don't see anything else that could cause the symptoms you described. Replace one and recheck that channel before replacing the other.

17th November 2011, 04:45 AM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Punch 40 DSM Punch 40 DSM PC-0001-A REV A I have a punch 40 dsm I am working on and it has no output. It came in with a burned up power supply. I repaired the power supply and all is well with that. The amp is producing 46.1 vdc rail voltage The op-amps have positive and negative voltage of 11.61 vdc on pins 4 and 8. The regulators are out putting fine. There is no DC on the bridging terminals. I have clean audio on pins 1 and 7 of the op-amps. The capacitors on the input board dont seem to be leaking or smell funny. The output fets are getting rail voltage but no audio signal. I have clean audio on both sides of C202. I have no audio on either side of C102. Pin 1 of HB1 has +12 vdc Pin 2 of HB1 has -12 vdc One thing I thought I would mention: HB101 pin 9: -3.104 vdc HB101 pin10: -7.26 vdc HB101 pin11: -10.85 vdc These pins should all have 0.000 vdc HB101 pin25: 0.000 vdc should have 3 vdc HB101 pin28: 0.000 vdc should have 3.6 vdc HB201 pin25: 0.300 vdc should have 3 vdc HB201 pin28: -0.200 vdc should have 3.6 vdc I dont know if this helps any but I am just wondering where I should look next? __________________ 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 Last edited by seankane; 17th November 2011 at 05:09 AM.

17th November 2011, 04:56 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the bias control allow you to bias the outputs on? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th November 2011, 05:01 AM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	NO neither channel will bias nor will the bias turn on either output. __________________ 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

17th November 2011, 05:14 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have the negative 12v on R102? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th November 2011, 05:25 AM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Yes -11.95 vdc on both sides __________________ 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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

17th November 2011, 05:56 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you replace the driver boards? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th November 2011, 05:59 AM	#7
seankane diyAudio Member Join Date: May 2010 Location: Washington State	No not yet should I do so? Also not 100% sure on the orientation of the new boards as they are a different revision and dont look the same. Both new and old boards having writing on them wondering if I should install the new boards with the writing on the same side as the old boards. The ones I will be using are the same as I sent you. Any tips for that? __________________ 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

17th November 2011, 07:02 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. I'm assuming that you've checked the various resistors between the board and the outputs. The supply voltages are all seem to be OK. I don't see anything else that could cause the symptoms you described. Replace one and recheck that channel before replacing the other. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
PUNCH 4080 DSM	bdgf2004	Car Audio	4	21st March 2011 07:45 AM
punch 40 dsm	bdgf2004	Car Audio	10	11th January 2011 12:03 AM
Rockford punch 100 dsm	mike49504	Car Audio	1	13th December 2009 12:41 AM
punch 100 dsm question	ben04srt	Car Audio	32	7th December 2009 12:38 AM
punch 60 dsm getting warm	ben04srt	Car Audio	5	3rd June 2009 10:37 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read