Hello community,
hoping everybody had a good week and is ready to attack the weekend projects. Speaking of, I got this Pioneer SA-9800 from a friend that is acting up. One channel sounds more or less OK (with a little Hum), the other one is completely distorted. I think the problem is the power supply as the screen is also acting up (low dim and I can see the bars moving with no audio input). There is probably a thread somewhere addressing a power issue on AK, and I would appreciate if someone can please point me in that direction so we don't start a new thread.
By the way, the relay clicks and there is distorted sound. Here are the voltages I measured:
Pin # Current Values
Pin 1 = -53.7
Pin 2 = -53.7
Pin 3 = 70.2
Pin 4 = 70.2
Pin 5 = 32.64
Pin 6 = 32.64
Pin 7 = 19.36
Pin 8 = 0
Pin 9 = -52.6
Pin 10 = -32.42
Pin 11 = -32.42
Pin 12 = 50.5
Pin 13 = 70.3
Pin 14 = 0
Pin 15 = -72.4
Pin 16 = -0.03
Pin 17 = -0.03
Pin 18 = -0.47
Pin 19 = 0
Pin 20 = 0
Pin 21 = -0.02
22 = -0.02
23 = -0.03
24 = -0.03
25 = 0.19
26 = 0.03
27 = 0.025
28 = -0.03
29 = 0.03
30 = 62.5
31 = 62.5
Could any of you please verify or validate the voltages above? I might have messed up with some negative or positive values but the values are what comes out of the MM. Again, I apologize if this information in on another thread. Thanks immensely to the community in advance.
PS: I am concerned about Pins# 3&4. I think I read somewhere here that it should be another value. Also, the power supply has not been worked on yet. I might end up recapping it, but the problem seems to be on one or more of the transistors in it. so far I have identified" A9004, C1914, K3404. etc. Any advise on replacement and where to get them?
hoping everybody had a good week and is ready to attack the weekend projects. Speaking of, I got this Pioneer SA-9800 from a friend that is acting up. One channel sounds more or less OK (with a little Hum), the other one is completely distorted. I think the problem is the power supply as the screen is also acting up (low dim and I can see the bars moving with no audio input). There is probably a thread somewhere addressing a power issue on AK, and I would appreciate if someone can please point me in that direction so we don't start a new thread.
By the way, the relay clicks and there is distorted sound. Here are the voltages I measured:
Pin # Current Values
Pin 1 = -53.7
Pin 2 = -53.7
Pin 3 = 70.2
Pin 4 = 70.2
Pin 5 = 32.64
Pin 6 = 32.64
Pin 7 = 19.36
Pin 8 = 0
Pin 9 = -52.6
Pin 10 = -32.42
Pin 11 = -32.42
Pin 12 = 50.5
Pin 13 = 70.3
Pin 14 = 0
Pin 15 = -72.4
Pin 16 = -0.03
Pin 17 = -0.03
Pin 18 = -0.47
Pin 19 = 0
Pin 20 = 0
Pin 21 = -0.02
22 = -0.02
23 = -0.03
24 = -0.03
25 = 0.19
26 = 0.03
27 = 0.025
28 = -0.03
29 = 0.03
30 = 62.5
31 = 62.5
Could any of you please verify or validate the voltages above? I might have messed up with some negative or positive values but the values are what comes out of the MM. Again, I apologize if this information in on another thread. Thanks immensely to the community in advance.
PS: I am concerned about Pins# 3&4. I think I read somewhere here that it should be another value. Also, the power supply has not been worked on yet. I might end up recapping it, but the problem seems to be on one or more of the transistors in it. so far I have identified" A9004, C1914, K3404. etc. Any advise on replacement and where to get them?
