cassette motor RPM

M

Marko

Guest
I have a Fisher cassette deck here with everything fixed and the head
aligned, but it runs a little fast.

Is there an adjustment potentiometer in a cassette deck to lower the voltage
to the motor a little? I found plenty of adj pots, but they are all in
pairs so they probably are not for the motor.

I see no pots on the board with the motor circuitry. Thanks, Mark
 
Most such motors have a small hole at the rear for access to a small
adjustment potentiometer inside. A very small adjustment screwdriver is
required, of course, and a gentle touch.


Mark Z.



"Marko" <marko@vonl.com> wrote in message
news:1s-cnbbjo-wAZYGiXTWJiQ@nstci.com...
I have a Fisher cassette deck here with everything fixed and the head
aligned, but it runs a little fast.

Is there an adjustment potentiometer in a cassette deck to lower the
voltage
to the motor a little? I found plenty of adj pots, but they are all in
pairs so they probably are not for the motor.

I see no pots on the board with the motor circuitry. Thanks, Mark
Click to expand...
 
On Tue, 22 Jul 2003 10:20:31, "Mark D. Zacharias"
<mzacharias@nospam.earthlink.net> wrote:

:> Most such motors have a small hole at the rear for access to a small
:> adjustment potentiometer inside. A very small adjustment screwdriver is
:> required, of course, and a gentle touch.

Mark is 100% correct, but I'll add, use a plastic tool for adjusting
the pot, as the pot will be at some other potential than the case
of the motor. Probing around with a steel screwdriver could easily
distroy the regulating circuit inside the motor (been there, done
that!).

--
Tedd Doda VE3TJD

remove: lose.this. to reply directly.
 
Just ask the experts. Thanks for the info. guys. Mark (top post)
"Marko" <marko@vonl.com> wrote in message
news:1s-cnbbjo-wAZYGiXTWJiQ@nstci.com...
I have a Fisher cassette deck here with everything fixed and the head
aligned, but it runs a little fast.

Is there an adjustment potentiometer in a cassette deck to lower the
voltage
to the motor a little? I found plenty of adj pots, but they are all in
pairs so they probably are not for the motor.

I see no pots on the board with the motor circuitry. Thanks, Mark
Click to expand...
 
Actually, I've never seen a motor damaged touching the metal of the
screwdriver momentarily to the motor case while adjusting. Just makes the
speed go bonkers for a moment.

Mark Z.


"Tedd Doda" <tdoda21@lose.this.rogers.com> wrote in message
news:nurR1rKS7zEK-pn2-9biPFdEHwbsu@lazer...
On Tue, 22 Jul 2003 10:20:31, "Mark D. Zacharias"
mzacharias@nospam.earthlink.net> wrote:

:> Most such motors have a small hole at the rear for access to a small
:> adjustment potentiometer inside. A very small adjustment screwdriver is
:> required, of course, and a gentle touch.

Mark is 100% correct, but I'll add, use a plastic tool for adjusting
the pot, as the pot will be at some other potential than the case
of the motor. Probing around with a steel screwdriver could easily
distroy the regulating circuit inside the motor (been there, done
that!).

--
Tedd Doda VE3TJD

remove: lose.this. to reply directly.
Click to expand...
 
On Wed, 23 Jul 2003 10:53:05, "Mark D. Zacharias"
<mzacharias@nospam.earthlink.net> wrote:

:> Actually, I've never seen a motor damaged touching the metal of the
:> screwdriver momentarily to the motor case while adjusting. Just makes the
:> speed go bonkers for a moment.

Wait till you find one where the "pot" isn't centred in the adjusting
hole :)

I did many, many car audio repairs over the years and have only
damaged one. Not bad odds, but for the sake of a plastic tool,
why not use it.

--
Tedd Doda VE3TJD

remove: lose.this. to reply directly.
 
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