Arfa Daily wrote in message
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"Tim Schwartz" wrote in message
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On 2/18/2011 7:32 AM, N_Cook wrote:
Arfa wrote in message
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wrote in message
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Arfa wrote in message
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Anyone by any chance got schematics for an Arcam Alpha 10 amplifier
?


P.S. These switches were used in the Arcam Delta 290, Xeta 1 and Alpha
9
integrated amps, along with the Creek 5350 and some Yamaha products. I'd
guess along with many others I don't know about.

Yes, that's exactly what I did. You remove the switch from the board, and
unbend the three tags on the front. that allows you to withdraw the shaft
from the wafers. There are index marks on the wafer rotors, and the shaft
is
flattened on two sides, so you can't get the indexing wrong, if you pay
attention in the first place. The only one that you have to watch a bit,
is
the front-most wafer that controls the motor stop, because that one is
driven differently via two tabs. The wafers themselves are easily 'sprung'
from the frames, and the rotors easily unclip from the bodies - like a VCR
mode switch. I have some very very fine wet and dry paper - something like
1000 grade - and I use a tiny piece held in needle point tweezers to
burnish
the contact pads and central ring back to bright metal. I clean the
rotating
contacts with a pencil rubber, and re-tension them. Finally, I add in a
drop
of high quality switch cleaner / lubricant, before clipping the rotor back
in. The individual wafers can then be clipped back into the frame, and the
index marks used to realign them, before refitting the shaft. They run
like
silk after they have been thus refurbished, and are electrically silent. I
have never had any mechanical problems caused as a result of doing this,
nor
have I ever had one bounce. I haven't done as many as Tim, but probably
still twenty or more, over the years.

Arfa


While on contact cleaning, not Arcam. This week a problem with an awkward
to replace, odd footprint, relay. Clear plastic outer. Needle heated with
soldering iron to melt, not drill, into the cover over the contact gap and
another on the side. Then .45mm (wire core) diameter TeePee interdental
toothbrush will pass through the needle hole. The miniature "bootle brush"
bristles open out inside the contact gap and a side entry needle forces
against the to-fro and sideways cleaning of the brush. Neat Blob of hotmelt
glue over the holes after