Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old July 24th 03, 09:25 PM
seamus
 
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Hello everyone.
I am an electrician in Ireland, and came across a problem a few days
ago.
I was investigating why a motor of a washing machine in a commercial
laundry would not spin correctly and found the cables going from the
tacho generator to the control electronic were causing the problem, I
rerouted the cables and found all worked ok.

I suspect some form of mutual inductance, the tacho cables only carry
a small voltage, but was in a loom with many main voltage cables, Did
anyone ever come across a similar problem ? If so what is the best way
of identifying the problem, would an oscilloscope be required. Even
though I know I sorted out the problem I would like to know the best
way of testing for this problem .

Thank you for all your help
Seamus

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Old July 25th 03, 02:50 AM
Clifton T. Sharp Jr.
 
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seamus wrote:
I am an electrician in Ireland, and came across a problem a few days
ago.
I was investigating why a motor of a washing machine in a commercial
laundry would not spin correctly and found the cables going from the
tacho generator to the control electronic were causing the problem, I
rerouted the cables and found all worked ok.

I suspect some form of mutual inductance, the tacho cables only carry
a small voltage, but was in a loom with many main voltage cables, Did
anyone ever come across a similar problem ? If so what is the best way
of identifying the problem, would an oscilloscope be required. Even
though I know I sorted out the problem I would like to know the best
way of testing for this problem .


Sounds to me like your experience, which made you suspicious of lead
dress as a possibility, was the best troubleshooting tool for that job.
A 'scope might have shown you noise on the tach wires, but might not
have helped you determine its source.

--
All relevant people are pertinent.
All rude people are impertinent.
Therefore, no rude people are relevant.
-- Solomon W. Golomb


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