Yamaha CS80

Hey,

After some research what they meant by R51-52 was the boards and not resistors.
Found FH and FH points on the R2 ( in the CS-50 and maybe 60 ??) BOARD ;) ... Darn it why 
name boards after common shorts for electronic parts ... To much sake perhaps


-----Originalmeddelande-----
Från: "Robert Stewart" <bob@...>
Till: yamahacs80@yahoogroups.com
Datum: 2013-09-18 11:26
Ämne: Re: [yamahacs80] cs-50 vcf calibration

       
Sorry... Misread your Email.

On the CS50 the card you need to look at is R6 I believe.
Terminals FH, and FL

B


On 18/09/2013 10:02, rikard.latvala@... wrote:
 
  
Hey,

I am working on a CS-50 that had several problems with the trimpots on the M boards. I have installed new ones and replaced them all with multiturn one's. I have almost completed the calibration procedure but hit a problem when i got to the vcf calibration. The CS-80 calibration procedure states that i should get 4.0 Volts moving the cutoff lever on the front panel and measuring at R51 or R52. The only marked resistor i can find on the M boards is R6 and R7, others only have their resistance marked. Any one know witch ones they are talking about ?


At point (FH) F1 on cs-50 i only have 0.003 - 0.12 volts so i can not get the 4.0 volts there no matter how the cutoff lever or trimpot is set. Could it be before the 330 ohm resistor ? (actually a 230 ohm one in the cs-50).


Please help, I really want to close it up and get it back to its owner. I am thinking about gathering all the calibra tion data and make a much clearer procedure as much of the info in the calibration manual is wrong.