Help with American Bass XD3000

RJohns777 · 15th March 2011, 10:23 PM

Hi, can anyone tell me the numbers of the two 8 pin ICs used on the driver board of the American Bass XD3000? I'm getting a noise in the output. Tried the driver board in a known good XD3000. Same problem. Thanks!

Perry Babin · 16th March 2011, 09:26 PM

They are probably an LM211 and a TL072. Typically, the one with the lowest circuit board designation is the TL072. I think (not sure) that pins 1 and 4 are connected together on the LM211. This may help you confirm which one is the LM211.

Are they covered with epoxy?

RJohns777 · 17th March 2011, 01:02 AM

Thanks Perry. No they are not covered with epoxy. The numbers have been ground off. I have two of these with driver board problems. I'm needed the numbers to help with trouble shooting. The amps had output problems. I've replaced those. One board has no drive and the other is causing noise. I know it's on the board because I can put it in a known good amp and I have the samr problem. Thanks again!

Perry Babin · 17th March 2011, 07:07 AM

Check for poor solder connections on the transistors near the ends of the board. They often overheat and the solder oxidizes.

You should also confirm that the gates of ALL of the outputs are being driven. These amps will work even if several of the groups of outputs aren't being driven. If all aren't being driven properly, the amp won't be reliable.

RJohns777 · 17th March 2011, 12:13 PM

I'll be sure and check that. Thanks.

15th March 2011, 10:23 PM	#1
RJohns777 diyAudio Member Join Date: Mar 2011	Help with American Bass XD3000 Hi, can anyone tell me the numbers of the two 8 pin ICs used on the driver board of the American Bass XD3000? I'm getting a noise in the output. Tried the driver board in a known good XD3000. Same problem. Thanks!

16th March 2011, 09:26 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	They are probably an LM211 and a TL072. Typically, the one with the lowest circuit board designation is the TL072. I think (not sure) that pins 1 and 4 are connected together on the LM211. This may help you confirm which one is the LM211. Are they covered with epoxy? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th March 2011, 07:07 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check for poor solder connections on the transistors near the ends of the board. They often overheat and the solder oxidizes. You should also confirm that the gates of ALL of the outputs are being driven. These amps will work even if several of the groups of outputs aren't being driven. If all aren't being driven properly, the amp won't be reliable. __________________ 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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17th March 2011, 01:02 AM	#3
RJohns777 diyAudio Member Join Date: Mar 2011	Thanks Perry. No they are not covered with epoxy. The numbers have been ground off. I have two of these with driver board problems. I'm needed the numbers to help with trouble shooting. The amps had output problems. I've replaced those. One board has no drive and the other is causing noise. I know it's on the board because I can put it in a known good amp and I have the samr problem. Thanks again!

17th March 2011, 12:13 PM	#5
RJohns777 diyAudio Member Join Date: Mar 2011	I'll be sure and check that. Thanks.

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