[Jukebox-list] Ami I200 dosn't stop scanning

[David Breneman]

--- Kevin Ward <kevin at kevinward.freeserve.co.uk> wrote:

> Really desparate now.Where do the red and grey wires coming out of
> the scan switch go?I have a wireing diag but not in colour and I am
> a bit thick.Kev.

I never understood you original question.  Are you saying
that the push button in the control box that causes the
record rack to rotate has had its wires cut, or is there
some other issue?  I'll assume (I know, dangerous) that the
I mechanism is enough like the G that the scan switch that
automatically starts and stops the rotation is the same.
With that switch, a selecion causes a coil to pull a
bar, which allows a spring-loaded disk to rotate.  A
pin on the disk thereby releases the scan switch, causing
the contacts to close and the record rack to rotate.
This assembly is located under the popularity meter,
because the same shaft that turns the meter drum also...

When the coil releases, the spring-loaded disk moves back
in contact with the rotating shaft.  As the record rack and
this shaft rotate, the disk slowly rotates to its
rest position, at which point it opens the aforementioned
switch and the record rack stops rotating.  This switch
is wired in parallel with the manual scan button in the
control box.

The problem arises in that after decades of operation,
this disk, which originally had a knurled surface to
engage a splined surface on the shaft, wears smooth,
and loses its grip against the shaft.  Also, decades
of manually scanning the record rack at the end of 
travel ("off" position) of the disk cause the splines
on the shaft to wear an indentation in the edge of the
disk, and the combination of the two make it very
very difficult for the shaft to "climb out of this
rut" and rotate the disk the last couple degrees to the
scan switch cutoff point.  This may be what's causing
your machine to continuously scan.  I fixed one of these
pretty effectively by running a ribbon of JB-Weld along
the edge of the disk, filling in the rut, and shaping
the surface with a file after it dried.  There is no
easy way to access this assembly because of its location
under the popularity meter drum.  "Some dis-assembly
required."  Hope this helps.


David Breneman         david_breneman at yahoo.com

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