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Old 26th November 2012, 09:05 AM   #1
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Default Polk Audio sub PSW111

Hi Everyone,

I had recently bought Polk Audio sub-woofer PSW 111, accidently i shorted it, now having a issue with the power supply board, would appreciate if some one could send me the schematic for this sub.

Thanks in advance ---- Mike
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Old 1st October 2013, 08:36 AM   #2
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Location: Mumbai, India
I am also look for the schematic for the SUB PSW 125. have the same power supply probem.
Somebody please assist us with the schematics.

thanks,
Hemant
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Old 27th September 2014, 01:00 PM   #3
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Hi guys, did you succeeded in repairing this subwoofer?
I'm trying to repair a PSW111 for an american friend here in France. The power supply died. I'd need to know the power voltage.
I removed the transformer and all components between it and the mains, and already did some test with external supplies, but I'd like to be sure.
For the preamp stage I use a single secondary coil of a 10VA 220/2*15Vac transformer which finely gives ~22Vdc at the inputs of the 7815/7915 regulators. Bonus, when the friend will be back in the USA, he can use the 2 coils to get 15Vac input again . I think the transformer will work the same with only 110 at primary.

I'd also need to know the voltage across J8 or 0.1 ohm R104 or her sister near J8 (can't see the part reference because of the glue around there) to check the amplifier idle current.
I already tested with two 150W 24V PWM supplies, but I find only 500V on the 0.1 ohm which gives 5mA idle current I feel too small.

Please can you help?
Thanks in advance

Last edited by HumNSmoke; 27th September 2014 at 01:07 PM.
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Old 27th September 2014, 01:53 PM   #4
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[EDIT]: belt & braces, I added 470F 35/50V parallel on C10 and his brother (+/- 15V regulators inputs) below the PCB to keep free of the hum an analog 50/60Hz supply would generate compare to a high frequency pwm supply.
Hope this help.
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