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Old 3rd March 2014, 03:27 AM   #31
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Quote:
Originally Posted by Itsme View Post
Probe 1 was connected to the drain or collecter of the irfb31n20dpbf and probe 2 was connected to the gate. I'm not really sure where to find rail + and -, everywhere I test I get AC voltage of around 60 volts.
Also probably a dumb question but should all the output transistors be the same kind or should they be half pnp and half npn types?
Drain and collector are not the same. FET and BJT transistors. IRFB31n20 is FET. Yes half may N or P channel depends.

If not written as "-rail" or "+rail", you may found the rail voltages across the big capacitors, one leg of the capacitor is connected either the drain or source of the output FET depending to topology.

Please start reading this website
http://www.bcae1.com/ , this is easy to learn and very very nice reference. Everything you will found here.

Please send me an email armand_jr2001@yahoo.com if you have any questions, ill try to assist you as I can but I still have limited knowledge in repairing amps.
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Old 3rd March 2014, 07:48 AM   #32
Itsme is offline Itsme  United States
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Ok, I did some research and found my rail voltages. I also found another issue, my voltages aren't matched. -74 vdc on one and +64 on the other rail, about a 10 volt difference. So here are the oscilloscope pictures hooked up correctly, probe 1 connected to neg. rail and probe 2 connected to pos. rail. Also that ground wire would not work for rails, had to connect to B- to get voltage. One of the pictures is AC and one is DC on oscilloscope. If you have any idea's please let me know, this is driving me nut's. With the different voltages I am wondering now if I do have toroidal winding problem.?
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File Type: jpg IMG_1441.jpg (537.9 KB, 21 views)
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Old 3rd March 2014, 08:28 AM   #33
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Join Date: Jun 2011
Location: Manila
Quote:
Originally Posted by Itsme View Post
Ok, I did some research and found my rail voltages. I also found another issue, my voltages aren't matched. -74 vdc on one and +64 on the other rail, about a 10 volt difference. So here are the oscilloscope pictures hooked up correctly, probe 1 connected to neg. rail and probe 2 connected to pos. rail. Also that ground wire would not work for rails, had to connect to B- to get voltage. One of the pictures is AC and one is DC on oscilloscope. If you have any idea's please let me know, this is driving me nut's. With the different voltages I am wondering now if I do have toroidal winding problem.?
Please connect the black probe to negative speaker terminal or at the VSS of the secondary windings. It will correct the reading.
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Old 3rd March 2014, 09:01 AM   #34
Itsme is offline Itsme  United States
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Originally Posted by nonprof View Post
Please connect the black probe to negative speaker terminal or at the VSS of the secondary windings. It will correct the reading.
Thank you! I found a good ground by neg speaker close to where that ground to chassis was, that ground had a small cap connected to it and I think that is why it wouldnt work. Anyways here are some more photos correctly hooked up. The first ones are high pitch tone with static after amp is on a minute static goes away and leaves just high pitch tone and then I took the last two pics.
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File Type: jpg IMG_1457 (1280x960).jpg (652.4 KB, 12 views)
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File Type: jpg IMG_1459 (1280x960).jpg (628.6 KB, 11 views)
File Type: jpg IMG_1460 (1280x960).jpg (623.9 KB, 12 views)
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Old 3rd March 2014, 10:36 PM   #35
Itsme is offline Itsme  United States
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Perry? You out there?
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Old 4th March 2014, 05:29 PM   #36
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Check your email. I replied to the email you sent me.
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