There's bound to be some hi-fi guru here to help me (I hope!)

The deck was bought in the late '60's when I worked for Plessey and I could get it on discount.

It doesn't get used all that much these days, but SWMBO occasionally likes to put an LP on - and there's the rub, it doesn't work reliably.

I've taken it to pieces a couple of times to try and find out why and initially blamed the motor microswitch, which I managed to get a replacement for.. And of course that's not the problem I've now found.

It seems that when the arm is moved to start the motor the catch on to the linkage to the microswitch jumps over itself and the linkage arm is not operated. And of course every time I get any where trying to see the fault in action, it works perfectly, because I've turned the table upside down or something.

The question really is has anyone met this problem and if so did they find a solution?

Rob

Rob Graham wrote:
There's bound to be some hi-fi guru here to help me (I hope!)

The deck was bought in the late '60's when I worked for Plessey and I could get it on discount.

It doesn't get used all that much these days, but SWMBO occasionally likes to put an LP on - and there's the rub, it doesn't work reliably.

I've taken it to pieces a couple of times to try and find out why and initially blamed the motor microswitch, which I managed to get a replacement for. And of course that's not the problem I've now found.

It seems that when the arm is moved to start the motor the catch on to the linkage to the microswitch jumps over itself and the linkage arm is not operated. And of course every time I get any where trying to see the fault in action, it works perfectly, because I've turned the table upside down or something.

The question really is has anyone met this problem and if so did they find a solution?

Rob

Why not bypass the microswitch and have a manual switch somewhere nearby
to switch it on and off?

On 17/12/2015 12:57, Rob Graham wrote:
There's bound to be some hi-fi guru here to help me (I hope!)

The deck was bought in the late '60's when I worked for Plessey and I could get it on discount.

It doesn't get used all that much these days, but SWMBO occasionally likes to put an LP on - and there's the rub, it doesn't work reliably.

I've taken it to pieces a couple of times to try and find out why and initially blamed the motor microswitch, which I managed to get a replacement for. And of course that's not the problem I've now found.

It seems that when the arm is moved to start the motor the catch on to the linkage to the microswitch jumps over itself and the linkage arm is not operated. And of course every time I get any where trying to see the fault in action, it works perfectly, because I've turned the table upside down or something.

The question really is has anyone met this problem and if so did they find a solution?

Rob



https://www.youtube.com/watch?v=Qi7Sbcda6L4 any help?

Well on a Technics deck of similar vintage, in the end it seemed to be that
the lubrication was sticky. IE the oil itself seemed to have a consistancy
of treacle. Removing as much as possible and using sewing machine oil, an
old product but still usable, it seems to work again. It still sometimes
sticks on the run out groove when its supposed to pick the thing up though,
but I understand this was a known issue with the deck I have.

Brian

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"Rob Graham" wrote in message
...
There's bound to be some hi-fi guru here to help me (I hope!)

The deck was bought in the late '60's when I worked for Plessey and I could
get it on discount.

It doesn't get used all that much these days, but SWMBO occasionally likes
to put an LP on - and there's the rub, it doesn't work reliably.

I've taken it to pieces a couple of times to try and find out why and
initially blamed the motor microswitch, which I managed to get a replacement
for. And of course that's not the problem I've now found.

It seems that when the arm is moved to start the motor the catch on to the
linkage to the microswitch jumps over itself and the linkage arm is not
operated. And of course every time I get any where trying to see the fault
in action, it works perfectly, because I've turned the table upside down or
something.

The question really is has anyone met this problem and if so did they find a
solution?

Rob