Rockford Fosgate 1501bd preview Repairing - Page 5

josesony68 · 03:39 PM

Well, here are some of my measurements:

U17
Pin 1: 0
pin 2: 0
pin 3: 0
pin 4: -9.91
pin 5: 0
pin 6: 7.90
pin 7: 9.76
pin 8: 0

U5
Pin 1: 0
pin 2: 7.90
Pin 3: 8.15
pin 4: -9.91
pin 5: -0.40
pin 6: 8.23
pin 7: 9.76
pin 8: -0.93 and this measure ranged

U5 can be wrong?

Perry Babin · 20th January 2012, 04:47 PM

Post the voltage on U11. You shouldn't have any significant DC on pin 3 of U5.

josesony68 · 20th January 2012, 06:06 PM

U11

pin 1: -8,04
pin 2: 0
pin 3: 1,67
pin 4: -9,90
pin 5: 0
pin 6: -7,15
pin 7: 8,16
pin 8: 9,76

Perry Babin · 20th January 2012, 06:53 PM

This IC appears to be defective.

josesony68 · 20th January 2012, 07:40 PM

Okay, but this IC, I have not, I will order more parts, take me to come, eight or ten days.
Thanks for everything, Perry, and when I get the parts, I will tell what happens ...

josesony68 · 14th February 2012, 06:01 PM

Well, today I arrived I was missing the IC (LM6172)
This is what happens when connected:
The first thing to say that the amplifier is stable, even when loaded in the output and input signal.
The speaker produces hissing, (0.7 v at terminals)
When I connect the audio signal at the entrance, distorted sound on the speaker, and bass, as if it ran only 15% of its performance.
When you turn the gain level, the hissing sound changes, there is even a point at which almost disappears.
When I switch the switch on the stage, the speaker cone gives a blow.
I think the amp works, but must have a fault in the previous section ...
What do you think Perry?

Perry Babin · 15th February 2012, 10:32 AM

What do you mean by "When I switch the switch on the stage"?

josesony68 · 15th February 2012, 10:46 AM

No, sorry, must be my translator
I refer to the phase switch (0-180) which when I move it, produces a thump sound from the speaker....

Perry Babin · 15th February 2012, 11:21 AM

Do any of the op-amps in the preamp section have more than 0.01v difference between the inverting and non-inverting inputs? For 2-channel op-amps, check both sections of the op-amp.

josesony68 · 15th February 2012, 12:27 PM

Okay, I'll check this afternoon.
This measure, I always do, with the black test negative ground of the amplifier, right?

O refers to a probe on pin 2 of the TL072, and the other probe on pin 3 of TL072?

20th January 2012, 03:37 PM	#41
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Well, here are some of my measurements: U17 Pin 1: 0 pin 2: 0 pin 3: 0 pin 4: -9.91 pin 5: 0 pin 6: 7.90 pin 7: 9.76 pin 8: 0 U5 Pin 1: 0 pin 2: 7.90 Pin 3: 8.15 pin 4: -9.91 pin 5: -0.40 pin 6: 8.23 pin 7: 9.76 pin 8: -0.93 and this measure ranged U5 can be wrong? Last edited by josesony68; 20th January 2012 at 03:39 PM.

20th January 2012, 04:47 PM	#42
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post the voltage on U11. You shouldn't have any significant DC on pin 3 of U5. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

20th January 2012, 06:53 PM	#44
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	This IC appears to be defective. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

15th February 2012, 10:32 AM	#47
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What do you mean by "When I switch the switch on the stage"? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

15th February 2012, 11:21 AM	#49
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do any of the op-amps in the preamp section have more than 0.01v difference between the inverting and non-inverting inputs? For 2-channel op-amps, check both sections of the op-amp. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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20th January 2012, 06:06 PM	#43
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	U11 pin 1: -8,04 pin 2: 0 pin 3: 1,67 pin 4: -9,90 pin 5: 0 pin 6: -7,15 pin 7: 8,16 pin 8: 9,76

20th January 2012, 07:40 PM	#45
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Okay, but this IC, I have not, I will order more parts, take me to come, eight or ten days. Thanks for everything, Perry, and when I get the parts, I will tell what happens ...

14th February 2012, 06:01 PM	#46
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Well, today I arrived I was missing the IC (LM6172) This is what happens when connected: The first thing to say that the amplifier is stable, even when loaded in the output and input signal. The speaker produces hissing, (0.7 v at terminals) When I connect the audio signal at the entrance, distorted sound on the speaker, and bass, as if it ran only 15% of its performance. When you turn the gain level, the hissing sound changes, there is even a point at which almost disappears. When I switch the switch on the stage, the speaker cone gives a blow. I think the amp works, but must have a fault in the previous section ... What do you think Perry?

15th February 2012, 10:46 AM	#48
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	No, sorry, must be my translator I refer to the phase switch (0-180) which when I move it, produces a thump sound from the speaker....

15th February 2012, 12:27 PM	#50
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Okay, I'll check this afternoon. This measure, I always do, with the black test negative ground of the amplifier, right? O refers to a probe on pin 2 of the TL072, and the other probe on pin 3 of TL072?

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