SX-780 Darlington testing

[Luissx780]

Hello all,

I've been searching for a while and can't seem to find a detailed enough guide on how to test the Darlingtons on my sx 780. I blew a fuse (4A) in it a while ago, when I replaced the fuses, there are no longer the start up clicks. Are the darlingtons fried? or it is the protection relay?

I heard that it's very hard to find replacement darlingtons, so I'd like to be able to troubleshoot them first before doing anything else. I have a multimeter, where do i place the multi meter probes in order to see if the darligntons aren't fried?

Thank you all for your help!

 

[tsd71]

I use my Fluke multimeter in diode mode for continuity between pins 2&3, and pins 8&9, if there is continuity (beep) on either side the module is fried

 

[Luissx780]

Thanks!
Just checked, the one on the right (when unit is right side up) is beeping between pins 2 and 3. IS the whole unit junk? Do i have a hope in hell in finding the darlington replacement?

 

[jerrycpor]

You can find all you need about the replacement STK-0050s here

http://audiokarma.org/forums/index.php?threads/stk-0050-replacement-for-sx-780-and-others.721181/