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Arcam Delta 290 amp remote control

41 pin 4 wafer motorised function switch is driving me round the twist. Desoldered from the board and low voltage driving the motor to each of the six points where the first wafer switch , on in each of 6 positions, the one with narrow contact areas, is closed at dead centre of each 6 detents. Then each of the 3 corresponding wafers checks out ok. But solder the damn thing back in and the relative positions move. If the second wafer that sends 5V from the common via one of the 6 switch positions to the pic chip is not making, so not sending 5V to the processor, then both the function select and the volume control cease to function as both control lines to both motor drivers go down. Until you manually fiddle with the function switch and contact is made again.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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N Cook
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"N Cook" wrote in news:fs8ffr$gnm$ snipped-for-privacy@inews.gazeta.pl:

Have you checked for wear around the shaft, where it drives the rotor???

Do they break in different order when rotated back-wards than they make when rotated for-wards?

Perhaps an application of epoxy would 'fix' the rotors to the shaft so that they can not get out of alignment. Perhaps some 'shim stock' worked in, between the shaft and the rotors.

Good luck and 'watch out for the curve' when you 'go around the bend.'

--
bz

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an 
infinite set.

bz+spr@ch100-5.chem.lsu.edu   remove ch100-5 to avoid spam trap
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bz

One possible solution. Fix the whole switchbank rotated 90 degrees, with the motor uppermost, and bridge ribbon connect the 23 active lines. Leaving the original hidden underside of the wafers exposed so can add a bit of relative rotation if required. Its switching line level signals so stray signal pickup from extra wire should be no observable problem.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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N Cook

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