Sequential circuits samplers

Hello Again,

OK - i got my disk drive swapped out (thanx to the info provided
here) via a Sony model 
from eBay ($3.50 - not bad), but I am now facing the daunting task of
diagnosing/fixing 
the lack of velocity on about 8 keys. 
Starting with D4 (D in the 4th octave - counting from left to right),
I am seeing no velocity 
response for the next 8 keys. Do I need to pick up the service manual
(is this even covered 
in the service manual?)? Or does somoen here have expereience with
this? 
Thanx again to the Prophet Community,
James

I had a similar problem on my p2k keyboard sometime before the kybd 
controller chip finally expired, forcing me to retire the instrument. I still use my 
2k2 though.

the keyboard uses rubber pads that each land on a trio of contacts on a pcb. 
as I recall, velocity is sensed by measuring the delay between the outer ring 
of the pad shorting it's contacts and the centre of the pad landing on a 
central contact. so beyond dismantling and carefully cleaning this arrangement, I 
can't offer any other diagnosis.... I think it would be an odd fault for the 
keyboard controller to lose velocity sensitivity for a specific area like this.

unless... (light bulb comes on over head) the non-responding range is like 
that because that area of your keyboard mapping has no velocity-affected 
parameters set up.... try firing the thing up with no disc (i.e. using the internal 
wave sounds and presets) and see if the same thing happens.

duncan/r.m.i.