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I measured the DC coming off the caps earlier and IIRC it was in the order of +85v 0v -85v Can the bridge still be defective?

Looking at the heatsink from the back, it would be the last unit # 24, bottom right hand

5 XPL 909 1 RCA 410 There was at least 1 faulty transistor in each bank. What's the next move?

I was considering that upgrade but not like this. I would sooner install a populated and tested board rather than dicking around with something beyond my comfort zone. It`s not looking too good with the output transistors either. Correct me if I`m wrong, but I was always of the impression...

I`ll check those Sunday. Are you saying that if outputs are blown, there would be no upstream damage but blown drivers are an indication of upstream (driver board) nasties? As you can probably tell, I don't do much component level troubleshooting or repair. The idea of that kind or work...

A big thanks to all who chimed in so far. I`ll post after my individual transistor test, looks to be labor intensive. Do I reinstall the ones that are good? Can grease and mica be reused?

OK, the transistors on bank 1 that measure 11R are fine then. I`ll now remove all remaining outputs and drivers for out of circuit measurements. Will the same Collector to Emitter test be sufficient or should I do B to C and B to E as well? While they are out, would that be a good time to...

Yes. Out of circuit measure good, check my most recent post:sad2:

Auto scaling Fluke 75. ready for this? *Left Bank 1 All outputs measure 11R, driver measures .8R *Left Bank 2 All outputs measure .5R, driver measures .5R *Right Bank 1 All outputs measure .7R, driver measures 11R *Right Bank 2 All outputs measure .7R driver measures 190R...

D13 measures like a normal diode out of circuit and not .79

I stand corrected, out of circuit they measure good

The diodes in question are visibly charred

OK, so unless specified to the contrary, the bulb shall remain in. I just discovered both channel D 14 diodes are shorted, do you still want me to put fuses in and measure DC on the output posts? You think it would be wise to disconnect the meters? I do not wish to ad to the casualty list.

Developement Both channels D14 1N4004 are shorted

Dumb question: should this be tested with the bulb in circuit? If you look back a few posts of my findings after replacing 5a fuses, all tests were made with bulb in place.

I`m not sure which schematic to use for my serial # Fuses are AGX

Hi JB, thanks for chiming in. I think I know which rail wire and TO3 mounting screw you are referring to: while close, there is no penetration, there is 1.3M between all XPL 909 and RCA 410 collectors to chassis. I`m not sure which diodes you are referring to, the 1N4004s?. I wish I had a...

One more. Second picture is a "before" shot Video link:' http://s70.photobucket.com/user/Michael_Fedenko/media/video-2013-08-03-14-44-57.mp4.html

Here you go, let me know if you need more. I did not change the cap or resistors btw.

First off, thank you kindly for your input so far, you`ve no idea how much it`s appreciated. Please note that the board has been removed. The wire that was terminated to the cap buss bar is still in place and tied in with the 2 negative speaker terminal, white wire going behind driver board and...