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Old 29th January 2011, 06:57 AM   #131
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Orderd a new IC and new drivers for the amp once they come in ill see what happens
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Old 4th February 2011, 09:04 AM   #132
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Put the new ic in the amp. Now it just draws excessive current And sounds like it wants to blow up theres a loud clicking noise comming from somewhere on the board but its not the relays.
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Old 5th February 2011, 12:04 AM   #133
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Sometimes the inductors and transformers will make a clicking noise if high current is pulsed through them. Are any of the outputs heating up?
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Old 7th February 2011, 07:41 PM   #134
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Do i need the outputs in this amp to test voltages on pins 8.9,14 ? Im gonna go through this entire amp today.
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Old 7th February 2011, 08:06 PM   #135
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Ok with black probe on secondary center tap of the little transformer .

PIN8:0
PIN9:14.0
PIN14:18.6

RESISTOR

R18
1side:18.5

Other side 27.8

It appears that that circuit is working now Just wanna confirm this?
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Old 8th February 2011, 04:31 AM   #136
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That looks OK to me.
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Old 11th June 2011, 04:07 PM   #137
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Great thread, very informative. Perry, I have an xxx6500 that isn't feeling well, and I'm at a loss as to where to look to next. When I got the unit it had quite a few output fets blown as well as bad solder joints on the power supply transistors. I relaced all of the output fets with Fairchild equivelants and re-soldered all of the bad joints I found throughout the board. Now when I power it up, one of the bank of 7 fets immediately blows with a couple of them flaming up. I've gone through every diode, transistor, and fet that I can find on the board and they all check good. I did CRT repair for years but am fairly new to amplifier repair (trying to fix this for a friend) so I'm looking for a good starting point. I've read quite a few articles on theory of operation of class D amps, but have yet to find any schematics for this beast. Any ponters would be appreciated.
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Old 11th June 2011, 05:39 PM   #138
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Working with a large (50-100 watt) 2 ohm resistor in the B+ line and having the transistors clamped to the heatsink will virtually eliminate the possibility of blowing the power supply FETs.

Email me.
babin_perry@yahoo.com
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