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Old 10th May 2015, 08:32 PM   #1
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Default Help with PROEL powered speaker repair

Hi There.
See attached schematic.
This speaker came in with no sound problem.
The only sound I hear is a ticking sound every 2 seconds from the woofer.
I checked the lines labeled CSD on the schematic. These are the mute lines that go to the TDA7294 and the IRS2092.
According to the TDA7294 datasheet, it needs a positive voltage over here to get it out of mute.
I confirmed this by removing D17 and feeding a +5V here. This takes the TDA out of mute, and the tweeter works without any ticking sounds like the woofer.
Weird thing is a can see a shift of DC level along with the ticking sound on my scope at pin 5 of IRS2092 woofer amp chip. I replaced this IC, no change.
My first question is, where does the TDA get the positive voltage from to take it out of mute? Q12 sinks to a negative -5,6V. Weird....
Maybe the IRS2092 sends a positive voltage out of its pin 5?? I don't understand...
Secondly, If I can get the tweeter amp to work, surely the power supply is fine?
I also replaced C51 and C56. I double checked all the voltages indicated on the schematic. The supply rails 5,6V for the IRS2092 are there and clean.
Any suggestions .
Attached Files
File Type: pdf 96PCAAWD1215-WD12A-15A-Supply&Amplifier_PCBA-revA.pdf (410.6 KB, 45 views)

Last edited by diy didi; 10th May 2015 at 08:36 PM.
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Old 16th May 2015, 07:33 AM   #2
Cresnet is offline Cresnet  Germany
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check the power supply lines

if all good, check mosfets. if good

replace IRS

enjoy
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Old 16th May 2015, 08:59 AM   #3
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The trebble amp uses a different supply to the main amp. Is the IRS oscillating?
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Old 16th May 2015, 09:05 AM   #4
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This may help with the pin outs
http://www.irf.com/product-info/data...ta/irs2092.pdf
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