Crunch GP 3000

mike49504 · 27th April 2011, 03:51 PM

Ok im working on this amp again after putting new + - 5 volt regulators in it.

Im running into the same problem again Amp powers up for a sec then goes straight into protection mode.

Heres what i have done to the amp.

I replaced both 5 volt regulators ( L7805 L7905) I put in a new KA78T12 regulator. I tested output driverboard in another amp and it seem to work fine.

Any ideas on where to start on this amp??

Perry Babin · 27th April 2011, 05:29 PM

Is there any DC on the output filter inductor when it powers up?

mike49504 · 27th April 2011, 06:17 PM

I get -104.8 volts on both output filter inductors when powering it up

Perry Babin · 27th April 2011, 08:04 PM

It would appear that you have leaking or shorted outputs if the driver board is OK.

Without the driver board, do you have DC on the inductors?

mike49504 · 28th April 2011, 02:25 AM

With no driverboard I have 0 volts on the output filter inductors

Perry Babin · 28th April 2011, 02:31 AM

You stated that the driver board seemed to work right in the other amp. Did the other amp produce clean audio with this driver board installed?

mike49504 · 28th April 2011, 02:35 AM

Not sure didnt get that far. All i know is the amp didnt go into protection mode.

I have another driverboard here that should be in 100% working conditon since its brand new

mike49504 · 28th April 2011, 03:21 AM

Ok right now im in the process of testing all of the outputs I removed them from the board and im checking all of them ill post back with my results

mike49504 · 28th April 2011, 03:38 AM

Ok i tested all of the outputs and all test the same here are the readings.

1-2:OL
1-3:OL
2-3:0.451

Probes reversed
1-2:OL
1-3:OL
2-3:OL

Do you need me to post the voltages on the pads for the output driver board?

Perry Babin · 28th April 2011, 03:55 AM

Please post a photo of the inside of the amp showing the component side of the driver board.

27th April 2011, 03:51 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Crunch GP 3000 Ok im working on this amp again after putting new + - 5 volt regulators in it. Im running into the same problem again Amp powers up for a sec then goes straight into protection mode. Heres what i have done to the amp. I replaced both 5 volt regulators ( L7805 L7905) I put in a new KA78T12 regulator. I tested output driverboard in another amp and it seem to work fine. Any ideas on where to start on this amp??

27th April 2011, 05:29 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is there any DC on the output filter inductor when it powers up? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th April 2011, 08:04 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It would appear that you have leaking or shorted outputs if the driver board is OK. Without the driver board, do you have DC on the inductors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th April 2011, 02:31 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You stated that the driver board seemed to work right in the other amp. Did the other amp produce clean audio with this driver board installed? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th April 2011, 03:55 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Please post a photo of the inside of the amp showing the component side of the driver board. __________________ 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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27th April 2011, 06:17 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	I get -104.8 volts on both output filter inductors when powering it up

28th April 2011, 02:25 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	With no driverboard I have 0 volts on the output filter inductors

28th April 2011, 02:35 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Not sure didnt get that far. All i know is the amp didnt go into protection mode. I have another driverboard here that should be in 100% working conditon since its brand new

28th April 2011, 03:21 AM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Ok right now im in the process of testing all of the outputs I removed them from the board and im checking all of them ill post back with my results

28th April 2011, 03:38 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	Ok i tested all of the outputs and all test the same here are the readings. 1-2:OL 1-3:OL 2-3:0.451 Probes reversed 1-2:OL 1-3:OL 2-3:OL Do you need me to post the voltages on the pads for the output driver board?

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