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Post by mastertech on Nov 20, 2014 16:10:44 GMT -5
What does 0 mean in your posts? I can take it as open or shorted. Example, with your DMM set to diode scale and both probes not on anything, what does your meter read. Then if you touch both probes together, what does your meter read?
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Post by erased99 on Nov 20, 2014 18:10:54 GMT -5
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Post by mastertech on Nov 20, 2014 23:00:29 GMT -5
Well at this point I do not see anything indicating bad but that does not mean there may not be. But I would say to try changing out the 1 bad mosfet and see what happens. BUT, after you install the new part do not reconnect the speaker to try. First connect to your DMM on DC voltage scale and see if that 43v DC is gone. Just be careful powering it up out it the open. Do not touch any parts with it powered up. You could get a nasty shock and DC voltage is not good for you.
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Post by erased99 on Nov 21, 2014 0:53:52 GMT -5
Well at this point I do not see anything indicating bad but that does not mean there may not be. But I would say to try changing out the 1 bad mosfet and see what happens. BUT, after you install the new part do not reconnect the speaker to try. First connect to your DMM on DC voltage scale and see if that 43v DC is gone. Just be careful powering it up out it the open. Do not touch any parts with it powered up. You could get a nasty shock and DC voltage is not good for you. OK will do, Thanks again for your help mastertech! I'll go to my local electronics shop tomorrow. Should I just get any irf520 or is there specific ones I should ask for? Also, can I put it all back together after I install the new mosfet and it tests ok? Thank you. |
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Post by mastertech on Nov 21, 2014 9:38:31 GMT -5
If you do not have any DC on the output I would then connect the speaker and send a signal through it and see if it works. Then I would put it back together.
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Post by erased99 on Nov 21, 2014 17:12:50 GMT -5
If you do not have any DC on the output I would then connect the speaker and send a signal through it and see if it works. Then I would put it back together. I got an irf530 as the store was sold out of the 520. The guy said it'll be good, just higher amps vs 520. Am I good to go? Thanks |
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Post by mastertech on Nov 21, 2014 17:54:46 GMT -5
Should be ok.
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Post by erased99 on Nov 21, 2014 20:44:08 GMT -5
If you do not have any DC on the output I would then connect the speaker and send a signal through it and see if it works. Then I would put it back together. Well, I got the 530 on the board, plugged the amp to power and tested the speaker wire. I'm still getting 43.5 V DC and 95.3 V AC Any ideas? |
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nashou
Unmoderated Off Topic
Tech in Training.....
Posts: 1,239 
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Post by nashou on Nov 21, 2014 20:58:17 GMT -5
Now recheck that IRF530 to make sure it din't blow as well. the we'll know if there is another faulty part.
Athanasios
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Post by erased99 on Nov 21, 2014 22:05:16 GMT -5
Now recheck that IRF530 to make sure it din't blow as well. the we'll know if there is another faulty part. Athanasios Hi OK, here's what I got: Amp unplugged. irf530 -probe to source +probe to drain 0 -probe to source +probe to gate 1206 +probe to drain -probe to gate 0 Thanks |
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nashou
Unmoderated Off Topic
Tech in Training.....
Posts: 1,239
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Post by nashou on Nov 21, 2014 22:13:54 GMT -5
Looks like thats ok. So there must be another part or parts that failed. We'll let Master tech follow up, hes the expert repair man here !
Nashou
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Post by mastertech on Nov 21, 2014 22:25:24 GMT -5
Without a schematic for me to look at it is hard to give a direction to test. If I had it in hand I would know where to look but looking at pictures is not helpful either. Give me some time to look over all these pics to see if I can give you a location to look for a problem.
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Post by erased99 on Nov 21, 2014 22:42:41 GMT -5
Looks like thats ok. So there must be another part or parts that failed. We'll let Master tech follow up, hes the expert repair man here ! Nashou Without a schematic for me to look at it is hard to give a direction to test. If I had it in hand I would know where to look but looking at pictures is not helpful either. Give me some time to look over all these pics to see if I can give you a location to look for a problem. OK, thank you guys, any help is greatly appreciated! If you need anything please let me know! |
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Post by craywm on Dec 27, 2014 23:09:20 GMT -5
Hey all,
Im a new member. Recently purchased a AS-P400 Woofer. stupid part was I had my brother in law buy it from california who did not test it properly (turned it on, saw a green light, but did not check the speaker). Good thing I didnt pay much... Anyway, Im getting no output from the speaker. I cant even hear a faint sound.. But whats funny is that if you give the speaker a signal, the indicator light will turn green from red meaning in "knows" its receiving a signal but is not outputting it. I began taking it apart but quickly put it back together noticing there are many parts on the board. I wanted to look up some pics of the inside to get to know the lay of the land. I am going to pull it apart and test it with my multimeter tomorrow more than likely.
I read through this topic and noticed that there is not much indication to the "correct" or "good" measurements of certain components. Obviously I will be checking the speaker to verify if it is blown or not, and from there test the amplifier. After this I will move onto the boards of smaller components (heat sink components as I find these always go out on receivers too).
Was there any further resolution with this issue? I have a full athena setup (very cheap) and really wanted this sub to work! I would appreciate any help and as always please give me direction by asking for further information! Thanks all!!
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Post by mastertech on Dec 28, 2014 0:08:56 GMT -5
Make sure you first check to see if there is any DC voltage on the speaker lines.
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