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Old 28th October 2003, 07:26 PM   #1
mouse is offline mouse  United States
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Default Need help--powered sub just died

I have a Dahlquist PDQXV powered subwoofer (yes, the same one as peddled on Ubid and Ebay)which has just recently decided to die on me. I pulled the amp board and have diagnosed the problem as a fried capacitor. Replacing it should give the sub life again but I have one problem-I have no idea what value the capacitor was. I have emailed Regnar, Dahlquist and even called Canadian Loudspeaker Corporation at the advice of Dahlquist but keep striking out. Do any members have access to a schematic (the company who owned Dahlquist and designed/manufactured the sub have went belly-up) or have any idea how I may find out the value of the destroyed cap? Any help would be appreciated-I'd hate to have to "junk" this sub on account of a .50 part. Thanks.

mouse
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Old 29th October 2003, 02:09 PM   #2
rabbitz is offline rabbitz  Australia
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The cap normally should have the value and voltage on it. Could always look for an identical cap on the board and measure that one.

If it's marked with the IEC code it will have 3 numbers and a letter, the first 2 numbers being the significant number and 3rd number is the number of zeros following. The value is in picoFarads. The letter is the tolerance. So a 123K is a 12,000pF, 12nF, 0.012Uf with a 10% tolerance.

If you take a photo and put it on the solid state forum, they might be able to help as some of those guys are psychic.
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Old 29th October 2003, 02:15 PM   #3
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Join Date: May 2002
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Quote:
(the company who owned Dahlquist and designed/manufactured the sub have went belly-up)
Maybe you sub just followed ........... ?!?

The advantage of subs is that they don't need coffins since this is one of their intrinsic design features !

Sorry, couldn't resist !

Regards

Charles
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Old 29th October 2003, 02:18 PM   #4
mouse is offline mouse  United States
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Default Thanks for the info, however,

when I stated the cap fried, it really fried. Nearly all of the dielectric burned off making the cap unmeasureable and unreadable.
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