Yamaha CS80

I've had some bad luck too in getting the exact voltages. After 
replacing all dual opamps, things got a bit better but still not 
100% according to spec. On my CS80 I didn't get some of the voltages 
(pin13 ic2; pin6 ic3, pin38 ic2) to spec even when I checked the 
power supply and had the TU at exactly 4.000V. However, ignoring 
this and after performing all the following steps (S/H + M-boards)I 
had my CS80 perfectly in tune on all ranges. I didn't realise pin 13 
and 38 interact with eachother, maybe I should try again and see if 
I can get everything according to spec then. Still I guess it will 
not help. Especially pin 6 ic3 was way off spec. Maybe some aged 
components are causing this ?

--- In yamahacs80@yahoogroups.com, "kent_spong" <kent_spong@...> 
wrote:
>
> Hi,
> 
> In my book that would be step 4.
> 
> Before you do anything make sure the tune pot is centered trim the 
> power supply, then check the TU pin on the KAS for 4.00 volts.
> 
> Then pin 6 of the lm310 for 0.125 volts holding down bottom C.
> 
> You need to check pin 38 as well as pin 13 on the YM2700 as one 
will 
> effect the other.
> 
> If you still get no luck let me know.
> 
> Kent
> 
>