Victor 9000/Sirius 1 restoration questions
ard at p850ug1.demon.co.uk
Wed Jul 11 15:22:09 CDT 2007
> A thorough cleaning is in order before you replace
> all that. I bathe my keyboards in a 10-15% solution of
> ammonia and water. I haven't yet disassembled a V9K
> keyboard, but I imagine it's typical as far as
> keyboards go. Remove the plastic and toss it in. If
> you need more details, I'll provide. It works well.
The notes I made when I repaired my Sirius don't say how the keyboard is
made, but from the schemaitcs, I'll bet it's a Keytronics. There are the
sadnard pair of Keytronics ASICs linked to a microcontroller (in this
case an 8021).
The outer casing will come off easily, screws on the bottom I think. Then
take out all the tiny screws ont he bottom of the PCB and seprate it from
Personally, I take the whole lot apart and clean the bits separately. It
takes longer, but if you get liquid into the foam pads of a Keytroncis,
it'll squish for a long time....
There are 2 common failure modes of the Keytronics 'swtich'. The foam pad
between the 2 mylar disks breaks up, or the metalisation on the lower
mylar disk vanishes. Eary to repair if you can find some spaee assemblies.
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