slimecity
Super Member
I have a problem all of a sudden with my much-loved C200s - audible distortion in both channels. I would describe it as "subtle" rather than "gross" distortion - ie: like the signal is perhaps 1/3rd, rather than completely distorted. Some questions -
I have a SM for the C200 - how similar is the C200s to the C200? If its not very similar then Im in trouble I suspect. I also suspect that getting hold of a SM for the C200s could be very wishful thinking.....
I am currently working to try to diagnose the issue by placing each board in one by one and testing voltages as per the schematics that I have - will this method work, or will it not give me accurate voltage readings? So far I have inserted PCB's 1 and 2 (the powersupply and headphone amp) and voltages have been to-spec on those PCBs, however on inserting the 3rd PCB (one of the filter output amp assemblies) I am getting crazy voltage readings on sections of that PCB.
Do I alternatively re-insert all of the PCBs and try to get voltages in the very small space that I have to work on there?
What is the best way to try to diagnose in this case? By signal probing? By using freeze spray, or keep going the way that I am going?
Are there FET's in this preamp? I see some 2SK97's in the phono boards. This is also a bit of a worry....
This will be a massive challenge I know, but Im willing to be patient.
Thanks
I have a SM for the C200 - how similar is the C200s to the C200? If its not very similar then Im in trouble I suspect. I also suspect that getting hold of a SM for the C200s could be very wishful thinking.....
I am currently working to try to diagnose the issue by placing each board in one by one and testing voltages as per the schematics that I have - will this method work, or will it not give me accurate voltage readings? So far I have inserted PCB's 1 and 2 (the powersupply and headphone amp) and voltages have been to-spec on those PCBs, however on inserting the 3rd PCB (one of the filter output amp assemblies) I am getting crazy voltage readings on sections of that PCB.
Do I alternatively re-insert all of the PCBs and try to get voltages in the very small space that I have to work on there?
What is the best way to try to diagnose in this case? By signal probing? By using freeze spray, or keep going the way that I am going?
Are there FET's in this preamp? I see some 2SK97's in the phono boards. This is also a bit of a worry....
This will be a massive challenge I know, but Im willing to be patient.
Thanks
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