Commodore 128D Keyboard problem

[eebuckeye]

I was lucky enough to find a Commodore 128D in great condition. I tested everything and it works great EXCEPT four keys on the keyboard do not work. I believe they are 5, 6, R and T. UGH!?

 

Any idea how I might fix this?

 

Thank you!

[RobertB]

Send it to Ray Carlsen for his expert repair.

 

Truly,

Robert Bernardo

Fresno Commodore User Group

http://videocam.net.au/fcug

July 26-27 Commodore Vegas Expo v10 -

http://www.portcommodore.com/commvex

[Uzumaki]

Looking at the keyboard schematic, column 18 deals with 4 of those keys. If C, F, and X are working, I'd guess there's a break in the circuit trace between F and R/T key. If the C, F, and X are not working, I'd look at the wire connecting to the keyboard circuit.

 

http://personalpages.tds.net/~rcarlsen/cbm/c128dcr/keyboard%20open.jpg shows what it looks like.

 

Maybe something got spilled in at one time and the spilled fluid has eaten through the trace? Taking it apart is a whole lotta screws though.

Edited June 10, 2014 by Uzumaki

[eebuckeye]

Thank you!

[JamesD]

I need a new key (the mechanism, not the cap) for one of the keys on my 128D.
Any source for these?