Yamaha CS80

the pitch bend is a ribbon on the CS80....totaly different then the wheel on the 70m....
I used to have one and still have my magneto's....
On the Cs80...there is no center detent.....where ever you touch the ribbon becoms zero......
you can pitch down from 0 to subhz(less than one hz), but only bend up from 0 an octave....and that is using the same lenght of ribbon...
-----Original message-----
From: "Anders Eriksson" aliaswavefront@...
Date: Tue, 17 Feb 2009 16:05:20 -0700
To: yamahacs80@yahoogroups.com
Subject: [yamahacs80] Yamaha CS70M Pitch bend problem

Hello everyone!

I have a problem with the Yamaha CS70M, it's the pitch bend on the 
last 6 highest notes G - C6, they wount go up a hole octave instead 
stops at G6 on all last 6 keys.

All ref.voltages from the service manual are correct (from keyboard, 
to the 12 voice cards), and when pitch bending a hole octave the key 
voltage doubles, for the highest key you have 4volt CV in on leg2 
(key voltage input) IG00153 and when pitch bend full upp: 8volt, but 
when the CV reaches 5.7volt the pitchbend stops. 

This is for all voice cards there is 12 of them, and i cant belive 
that all VCO IC's are faulty. Can it be a design fault from Yamaha?

How is it with the CS-80? when pitchbend fully up, have anyone 
measured the CV voltage on the IG00153 IC?

Would be greatful for all help!

/Anders