Cris Rowley
New Member
Hello to the group!
I inherited an SL-10 with original MC cart. from a friend that has a garbled distorted output when playing records. Doesn't sound like a cartridge issue as much as an electronics issue. I have been going through the unit extensively and replaced all caps in audio path and most other caps related to the preamp section. I get a good sine wave through the entire circuit until the negative side of C609 and C610. After that I get nothing. The only thing I can see when measuring voltages is that the supply voltage to the MCamp circuit is at 7.75V instead of the 8.9V stated in service manual. I am half tempted to put it all together to test out my repairs but the low voltage is concerning me that after the re-assembly, it may still be not work correctly. I have gone through the entire 12V supply side to the Q1 and Q2 transistors and even with all other paths verified good, I still can't get the voltage to come up. I replaced Q2, zener and related caps and resistor too.
I guess if there is a question in there, it would be has anyone dealt with this and if so what did you do about it?
Would really like to get this thing off my bench!
Thanks for any help or advice you can give.
I inherited an SL-10 with original MC cart. from a friend that has a garbled distorted output when playing records. Doesn't sound like a cartridge issue as much as an electronics issue. I have been going through the unit extensively and replaced all caps in audio path and most other caps related to the preamp section. I get a good sine wave through the entire circuit until the negative side of C609 and C610. After that I get nothing. The only thing I can see when measuring voltages is that the supply voltage to the MCamp circuit is at 7.75V instead of the 8.9V stated in service manual. I am half tempted to put it all together to test out my repairs but the low voltage is concerning me that after the re-assembly, it may still be not work correctly. I have gone through the entire 12V supply side to the Q1 and Q2 transistors and even with all other paths verified good, I still can't get the voltage to come up. I replaced Q2, zener and related caps and resistor too.
I guess if there is a question in there, it would be has anyone dealt with this and if so what did you do about it?
Would really like to get this thing off my bench!
Thanks for any help or advice you can give.