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Yes, again this is about my JA-S11 JVC Amp like in my previos thread. Now I was trying to repair it, and I was going to test the output pins on the Sanken s-40w, but before I could, resistor 629 started to release the magic smoke.
Also the nearby transistor, a 2SB560, gets pretty warm too.
This is all in the attachment called schematic. I've circled the smoking resistor and warming transistor. I've also included a photo with the same parts circled, but the schematic should be of most help. The full service manual, including a PCB layout, is available here. (Note: You may need an account to view it - the account is worth it, though (free))
Okay, so obviously the amp is stereo, one chanel has a fault, so lets look at the component pairs. I tested all the main parts of each of the chanels (in the faulty area only) and found that the problem chanel's values matched the OK chanel - so I assume there is probably not a fault here.
What I do believe, though is that the problematic chanel's darlington chipset (a SanKen S-40, shematic included) is at cause. The problematic chaels S-40W was also the one that heated up a lot (with no input) like I described in my previous thread.
I have found a seller of S-40W's but I want to be sure, as, well, they're expensive
Thanks a lot
Also the nearby transistor, a 2SB560, gets pretty warm too.
This is all in the attachment called schematic. I've circled the smoking resistor and warming transistor. I've also included a photo with the same parts circled, but the schematic should be of most help. The full service manual, including a PCB layout, is available here. (Note: You may need an account to view it - the account is worth it, though (free))
Okay, so obviously the amp is stereo, one chanel has a fault, so lets look at the component pairs. I tested all the main parts of each of the chanels (in the faulty area only) and found that the problem chanel's values matched the OK chanel - so I assume there is probably not a fault here.
What I do believe, though is that the problematic chanel's darlington chipset (a SanKen S-40, shematic included) is at cause. The problematic chaels S-40W was also the one that heated up a lot (with no input) like I described in my previous thread.
I have found a seller of S-40W's but I want to be sure, as, well, they're expensive
Thanks a lot
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