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i am working on a BG4002 with speed fluctuations at 33 & 45 rpm !
Martin pointed the finger straight to the DC platter motor and its worn bearings.
fair point !!
After comparing my spare motor with the sick motor I could instantly
feel the difference by finger-spinning its axle .
so far so good – I swapped over the two motors but now I can not sufficiently slowing
down the spare motor ?
new 25-turn trimmer pots – 33 & 45 – were fitted and the speed-change relay replaced by a modern version.
I asked if by any chance the speed controlling IC 1003C may be faulty but was ruled
out as a likely cause ?
i have to mention that all inputs at the speed controlling IC 1003C show 1 V higher than specified in the circuit diagram !!
as no other suspicious component was found would the spare motor also be in need of new bearings I wonder ??
if indeed its bearings are also worn would that case not rather having a “breaking effect” in the motor with higher friction to be expected and running slower and with speed fluctuations ?
anyone care to share some advice ???
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