Disklavier

i have found that it is some times possible in cases of chewing or other 
form of destruction of wires to examine the ends of the cut wires with a 
microscope and match cut patterns. of course if the little buggers 
removed sections of wire, you can not do this. it is only useful if you 
have just a couple of cut wires of the same color that you need to match.

On 8/13/2014 9:16 AM, freddismuke@... [disklavier] wrote:
>
> I've followed this group since I purchased my (used) MX80 Disklavier 
> years ago. It has been a valuable resource for me. It has a problem, 
> now I am truly stumped. After years of reading I now post and would be 
> very appreciative if someone could give me some direction.About a 
> 1-1/2 years ago after a "transistor error" appeared on the controller 
> display I discovered that mice had chewed through several wires on the 
> key solenoid driver wiring harness. I am quite handy and was able to 
> reconstruct the missing wire sections (a dozen or so) and voila! 
> Fortunately only a couple of those wires were of the same color 
> insulation so the possibilities for error were limited. I again 
> enjoyed my piano until "transistor error" reappeared 
> recently.Disassembly revealed real devastation, primarily on the same 
> harness but in 3 separate places along its run under the keys. 15-25 
> wires per site with many wires in each gnaw site sharing the same 
> color. A call to Yamaha Tech Supt and I found that the harness is now 
> unavailable, as well as the entire solenoid assembly. The main board 
> has been discontinued too. My console is now 20 years old, it's not 
> looking too good in the electronics department..Maybe a tech member of 
> this group has such a part. I feel that the permutations of wire 
> connections (not to mention the chance of board damage) is too great 
> to proceed with a "brute force" repair. If I can find a wiring diagram 
> (schematic) it could give me the ability to accurately trace back to 
> the plugs on the main board, but it would be ideal if a donor piano 
> existed for a complete harness.My old upright has given me many years 
> of enjoyment but is very limited in capability. I've added a DSR1 and 
> the CD unit and though I have a limited selection of music (no pitch 
> change) I can take this platform no further and though I lust after a 
> MK4 or E3 it's not a great time for that jump. I just hate those nasty 
> little %4*@&'s! Thanks for any assistance. Fred.
>
> 

-- 

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...
http://www.spencerserolls.com
(425) 791-0309