planet audio bb2400.1 - Page 5

Perry Babin · 28th August 2011, 09:42 PM

What is U4?

Is it shorted?

bdgf2004 · 28th August 2011, 09:52 PM

U4 is KIA431.

it's not shorted

Perry Babin · 28th August 2011, 10:02 PM

Does R40 connect to one of the pins on the closest opto-coupler?

If so, which pin?

bdgf2004 · 28th August 2011, 10:12 PM

yes, it is directly connected to pin #5 of U5 (TLP521-2).

Perry Babin · 28th August 2011, 10:32 PM

Are you sure that it's pin 5?

I'm working off of a schematic of an amp that I believe is similar and it looks like it should go to either pin 1 or pin 3.

bdgf2004 · 28th August 2011, 10:53 PM

R40 is connected to the pin with the red dot.

Perry Babin · 28th August 2011, 11:03 PM

Did you follow the trace or did you find the connection with your meter?

bdgf2004 · 28th August 2011, 11:04 PM

both. first the meter. then i followed the trace and it leads directly to R40

Perry Babin · 28th August 2011, 11:10 PM

I'm assuming that the circuit is like the one below but the diodes of the opto-coupler are on the low side (pins 1-4). Can you find any resemblance between this circuit and the one in your amp?

bdgf2004 · 28th August 2011, 11:41 PM

yes, i believe they're similar.

pin #9 on SG3525 is connected to pin #8 (collector) of TLP521 and pin #7 (emitter) of TLP521 is 1k ohms from ground

28th August 2011, 09:42 PM	#41
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What is U4? Is it shorted? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

28th August 2011, 10:02 PM	#43
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does R40 connect to one of the pins on the closest opto-coupler? If so, which pin? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

28th August 2011, 10:32 PM	#45
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure that it's pin 5? I'm working off of a schematic of an amp that I believe is similar and it looks like it should go to either pin 1 or pin 3. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

28th August 2011, 11:03 PM	#47
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you follow the trace or did you find the connection with your meter? __________________ 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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28th August 2011, 11:04 PM	#48
bdgf2004 diyAudio Member Join Date: Oct 2010	both. first the meter. then i followed the trace and it leads directly to R40

28th August 2011, 11:41 PM	#50
bdgf2004 diyAudio Member Join Date: Oct 2010	yes, i believe they're similar. pin #9 on SG3525 is connected to pin #8 (collector) of TLP521 and pin #7 (emitter) of TLP521 is 1k ohms from ground

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