Pioneer vsx 5600 blown outputs

[r_electronic]

Hello,
I recently required an early 90s pioneer vsx 5600 receiver. The guy I got it from said it stopped working one day and the unit did not make a second click when powering on (speaker protection relay). I know he ran like 11 speakers on this poor 5 channel receiver. Main output transistors Q1 and Q3 are blown, along with several burn't resistors on the AWH1008 amp assembly board. The transistors are a 2sa1302 and 2sc3281, which are obsolete, and they are notorious for counterfits all over the place online. Any comparable replacements? Upon desoldering Q1 and Q3, the protection relay released and I had sound on the right channel (didn't test other channels but I know those 2 power transistors would render the left dead). I believe replacing these resistors and transistors will fix it, but I'm not sure if any other components went out with it (such as driver transistors). Would this be worth it to fix? Are those transistors expensive? I will try to yank the board with the burnt resistors to find out the values, they scorched the board itself pretty good.

It won't let me upload the service manual pdf because it's too big (8mb really? lol). The link to download it is here: http://elektrotanya.com/pioneer_vsx-5600_vsx-5700s_sm.pdf/download.html
If that doesn't work I can email it to anyone willing to help.

Thanks,
Ron

 

[redk9258]

DigiKey and Mouser sell original Toshiba 2SA1943 / 2SC5200. About $3 each. Should be perfect replacements.

What P/Ns are the drivers?

 

[r_electronic]

DigiKey and Mouser sell original Toshiba 2SA1943 / 2SC5200. About $3 each. Should be perfect replacements.

What P/Ns are the drivers?

Thanks for the information, that's good to know. I haven't checked the drivers, can I test them in the same way I tested the outputs? Would they most likely be blown of the outputs were blown? I'll check on that part number and let you know.

Thanks,
Ron

 

[r_electronic]

DigiKey and Mouser sell original Toshiba 2SA1943 / 2SC5200. About $3 each. Should be perfect replacements.

What P/Ns are the drivers?

Also should I replace just the bad pout puts or should I replace the other working channels too so they are matched?

 

[redk9258]

I don't think you would necessarily replace parts in the other channel. I would get it working first, then decide. I doubt it will sound different from channel to channel. Definitely check the drivers and on up the line until you find no more bad parts. BTW, I'm no tech, just a tinkerer.

 

[r_electronic]

I don't think you would necessarily replace parts in the other channel. I would get it working first, then decide. I doubt it will sound different from channel to channel. Definitely check the drivers and on up the line until you find no more bad parts. BTW, I'm no tech, just a tinkerer.

Ok I'll start ripping it apart and checking for other shorts. Thanks for the help.