help rockford bd15001

stoke · 4th May 2011, 11:04 PM

hi, i got this amp this morning and when i power up i got 20volts on the speaker terminal and when i plug the remote out the amp looks like is still on but the protection led turns on. its only turn off after remove the battery cable. i checked all output transistor and all look fine.

Perry Babin · 4th May 2011, 11:08 PM

Do you have positive or negative 20v on the positive speaker terminal?

What is the DC voltage on all pins of U17?

What is the DC voltage measured directly across the red and black twisted wires?

stoke · 5th May 2011, 12:51 AM

there is 28.5v positive speaker terminal

u17
1;0
2;8.3
3;0
4;-9.7
5;0
6;1.1
7;9.8
8;0

there is 71volt across the red and black twisted wires

Perry Babin · 5th May 2011, 01:12 AM

That op-amp appears to be defective.

stoke · 04:37 AM

u17 replaced, now when i turn on, there isn't any voltage on speaker terminal but the amp gets on protected mode and stay on after remove the remote cable

Perry Babin · 5th May 2011, 04:45 AM

Post the DC voltage on U21.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

stoke · 5th May 2011, 05:08 AM

Pin 1: 8.2
Pin 2: 0
Pin 3: 7.1
Pin 4: -9.8
Pin 5: 5
Pin 6: 6.9
Pin 7: -8.5
Pin 8:9.8

Perry Babin · 5th May 2011, 12:45 PM

It appears to be in over-current protection. Are you sure that there are no shorted output transistors?

Do you read 0 ohms across R160 (large SMD resistor on the corner of the board)?

If yes to both of these, post the voltage on U18.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

stoke · 5th May 2011, 03:28 PM

yes i read 0ohms on r160

U18.

Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: -9.7
Pin 5: -0.5
Pin 6: 0.5
Pin 7: 8.5
Pin 8:9.8

Perry Babin · 5th May 2011, 05:58 PM

That op-amp appears to be defective.

4th May 2011, 11:04 PM	#1
stoke diyAudio Member Join Date: Mar 2010	help rockford bd15001 hi, i got this amp this morning and when i power up i got 20volts on the speaker terminal and when i plug the remote out the amp looks like is still on but the protection led turns on. its only turn off after remove the battery cable. i checked all output transistor and all look fine.

4th May 2011, 11:08 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have positive or negative 20v on the positive speaker terminal? What is the DC voltage on all pins of U17? What is the DC voltage measured directly across the red and black twisted wires? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 01:12 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That op-amp appears to be defective. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 04:33 AM	#5
stoke diyAudio Member Join Date: Mar 2010	u17 replaced, now when i turn on, there isn't any voltage on speaker terminal but the amp gets on protected mode and stay on after remove the remote cable Last edited by stoke; 5th May 2011 at 04:37 AM.

5th May 2011, 04:45 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post the DC voltage on U21. Pin 1: Pin 2: Pin 3: Pin 4: Pin 5: Pin 6: Pin 7: Pin 8: __________________ 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 May 2011, 12:51 AM	#3
stoke diyAudio Member Join Date: Mar 2010	there is 28.5v positive speaker terminal u17 1;0 2;8.3 3;0 4;-9.7 5;0 6;1.1 7;9.8 8;0 there is 71volt across the red and black twisted wires

5th May 2011, 05:08 AM	#7
stoke diyAudio Member Join Date: Mar 2010	Pin 1: 8.2 Pin 2: 0 Pin 3: 7.1 Pin 4: -9.8 Pin 5: 5 Pin 6: 6.9 Pin 7: -8.5 Pin 8:9.8

5th May 2011, 12:45 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It appears to be in over-current protection. Are you sure that there are no shorted output transistors? Do you read 0 ohms across R160 (large SMD resistor on the corner of the board)? If yes to both of these, post the voltage on U18. Pin 1: Pin 2: Pin 3: Pin 4: Pin 5: Pin 6: Pin 7: Pin 8: __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 03:28 PM	#9
stoke diyAudio Member Join Date: Mar 2010	yes i read 0ohms on r160 U18. Pin 1: 0 Pin 2: 0 Pin 3: 0 Pin 4: -9.7 Pin 5: -0.5 Pin 6: 0.5 Pin 7: 8.5 Pin 8:9.8

5th May 2011, 05:58 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That op-amp appears to be defective. __________________ 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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