Troubleshoot subwoofer amplifier SMPS board with laboratory PSU - diyAudio
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Old 22nd September 2014, 01:24 AM   #1
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Default Troubleshoot subwoofer amplifier SMPS board with laboratory PSU

Hello all,
I have an issue with a Bash amplifier of a subwoofer (ENERGY ESW-V8 which is another brand of Klipsch and similar as Klipsch RPW-10 or Synergy Sub-10). I have a fault on the primary side i think. I'd like to be sure that the secondary side of the SMPS is working as expected. Thus i could also check the remaining part of the sub, i mean all what is beyond, the speaker itself....I could know if all is working except the primary side of the power supply. Now that i explained you a bit. I have a laboratory power supply 3 output with 0-30v 2.5A each. My question is simple:
Where should i plug my lab PSU + and - on the amplifier SMPS. I know it has to be just after the transformer, i think its near the secondary rectifier diodes. But i need to know exactly. Also i think i need to have 1 lab PSU output with 15V on the 7815 and 7915 regulators and the other output to 25V on the secondary output diodes.
Here a picture of the SMPS board:
http://i.imgur.com/L14Q8.jpg
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Old 26th September 2014, 01:08 PM   #2
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Nobody inspired I see
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Old 9th December 2014, 03:06 PM   #3
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Howdy Bug,
I'm sure you could do as you suggest, bypass the internal SMPS with external supplies. I believe you'll need bipolar 15v for the preamp and 60 volt for the power section. You might get away with +40, but I wouldn't expect much with 30v. It's worth a try! If it works at all you'll be ready to attack the actual issue of repairing the SMPS.
I'm about to attack a SUB 10 with failed SMPS. Like so many, the glue applied to the parts around the daughter board to keep it from vibrating had turned conductive. An explosion resulted, blowing a chunk of copper off the circuit board. As soon as I figure out where the copper is supposed to be, I may have a working unit again.
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Old 9th December 2014, 04:30 PM   #4
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by bugmenotbugmenot View Post
Hello all,
I have an issue with a Bash amplifier of a subwoofer (ENERGY ESW-V8 which is another brand of Klipsch and similar as Klipsch RPW-10 or Synergy Sub-10). I have a fault on the primary side i think. I'd like to be sure that the secondary side of the SMPS is working as expected. Thus i could also check the remaining part of the sub, i mean all what is beyond, the speaker itself....I could know if all is working except the primary side of the power supply. Now that i explained you a bit. I have a laboratory power supply 3 output with 0-30v 2.5A each. My question is simple:
Where should i plug my lab PSU + and - on the amplifier SMPS. I know it has to be just after the transformer, i think its near the secondary rectifier diodes. But i need to know exactly. Also i think i need to have 1 lab PSU output with 15V on the 7815 and 7915 regulators and the other output to 25V on the secondary output diodes.
Here a picture of the SMPS board:
Click the image to open in full size.
Quote:
Originally Posted by bugmenotbugmenot View Post
Nobody inspired I see
Not "lack of inspiration" but that what you want to do is impossible, period.

Won't call it "nonsense" just out of courtesy.

Sorry.
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Old 9th December 2014, 04:48 PM   #5
rayma is offline rayma  United States
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Location: Upper midwest
Quote:
Originally Posted by bugmenotbugmenot View Post
Where should i plug my lab PSU + and - on the amplifier SMPS. I know it has to be just after the transformer, i think its near the secondary rectifier diodes.
If the SMPS output circuits are windings with rectifier diodes, you should be able to connect your lab supplies just after the diodes, with the appropriate voltages and polarities.
The SMPS output diodes will block the external voltages from affecting the SMPS circuit. Do you have a schematic?
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