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Audiopipe AP 3000 1D
Audiopipe AP 3000 1D
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Old 20th April 2019, 03:37 AM   #71
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Here is a picture of the audio driverboard .

Do you know what ic controls the drive signal for the outputs ?

There is something defective on the driverboard which is causing 1 board to have no drive signal to the outputs .

I swapped audio driverboard a and the amp has drive signal on the outputs but this audioboard makes the amp have no drive signal
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Old 20th April 2019, 06:27 AM   #72
Perry Babin is offline Perry Babin  United States
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All of the components have to pass their respective signals. Start by posting the voltage on the header. A marginal voltage there may let one board work where the other won't.

Before pulling the working board, make a note of all pins of all ICs that have the 80kHz square or triangle waveform (no audio input).
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Old 1st May 2019, 03:58 AM   #73
caraudioguy2100 is offline caraudioguy2100
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Voltage on the header of both boards

Non working board

Pin 1:-4.61
Pin 2:0.00
Pin 3:0.00
Pin 4:-12.97
Pin 5:12.97
Pin 6:0.11
Pin 7:5.00
Pin 8:0.00
Pin 9:5.00
Pin 10:0.21
Pin 11:4.66

Working board

Pin 1:0.00
Pin 2:0.00
Pin 3:0.00
Pin 4:-13.10
Pin 5:12.86
Pin 6:0.11
Pin 7:0.11
Pin 8:0.00
Pin 9:4.99
Pin 10:0.21
Pin 11:0.19
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Old 1st May 2019, 04:38 AM   #74
Perry Babin is offline Perry Babin  United States
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It's likely U704 that's defective.
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Old 1st May 2019, 04:43 AM   #75
caraudioguy2100 is offline caraudioguy2100
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Do you know what part number U704 is ?

The ones in this amp are defaced
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Old 1st May 2019, 05:13 AM   #76
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
These should be right. You can't trust the build houses nowadays. They've been known to have the wrong numbers printed on the ICs and they look normal.
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Old 1st May 2019, 05:20 AM   #77
caraudioguy2100 is offline caraudioguy2100
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Thanks for the info I will order the 219 and see what I come up with

Also the small ic is a 4560 correct ?
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Old 1st May 2019, 05:41 AM   #78
Perry Babin is offline Perry Babin  United States
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Yes.
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Old 2nd May 2019, 03:50 PM   #79
caraudioguy2100 is offline caraudioguy2100
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I’m working on this amp again replacing the lm219.

I noticed that neither board has drive signal on the outputs again .

I ordered new optocouplers .

1 set of optocouplers says
Lite-on high speed optocoupler 10MBd

The other set says
10Mbd open collector high speed optocoupler.

Are these the same pretty much or wondering what one I should use in this amp
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Old 2nd May 2019, 07:47 PM   #80
Perry Babin is offline Perry Babin  United States
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If the optocouplers have the right part number and you purchased them from a reputable distributor (not ebay), either should be OK.

The drive starts with the 4560. Do you have a triangle waveform on pin 1 of that IC on the driver boards?
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