Adrian,

Your were quite ambitious to take apart the motor and fix it, and what
you did was clean out the brush dust that was shorting the segments of
the commutator. Hopefully you also lubricated the bearings with a drop
of good quality (synthetic) oil. While the motor may now work for
years, you'll probably have to check the speed, as its likely to be off
after all of that. The standard way to check speed is with a reference
tape (usually 3KHz) and a frequency counter. Simply play the tape and
connect the output of the deck to the counter, and adjust the pot for a
reading that is the same as the frequency of the tape.

I think the motor is a Panasonic (Matsu****a), and can be replaced by a
Mabuchi, which is a common brand of replacement motors. They are
nominally 2200 RPM, you already know its 12V, and you can see if it
rotates Clockwise or Counter-clockwise (anti-clockwise). Here in the US
a motor like that costs around 3-6 pounds. The new motor is likely to
be quite a bit smaller overall, but should mount right up. You'll have
to transfer the pulley from the old motor to the new one. Don't forget
to measure the height of the pulley from the motor top before removing
it.

As you are doing recording, I'd suggest that the speed be checked as
soon as possible, so that the recording can be played on other machines.

Regards,
Tim Schwartz
Bristol Electronics


Adrian Brentnall wrote:

Hi All
My old (1980's) Marantz SD230 cassette deck 'died',,,,, suddenly !.
Symptoms - lights on - but no reponse to the 'play' button.

A quick check of the voltages shows that 'something' appears to be
pulling more current than it should, puling the main DC rail down from
19V to about 6V.

Disconnecting the multi-way connector that drives connects to the
drive motor and the play / record / pause switches restores the DC
rail to nominal.

12V dc applied direct to the motor results in a current of about 400mA
- but no rotation. Is it a fair assumption that the motor's at fault ?

If so - anybody know where I could find a replacement - motor is
marked MMI-6A2LK - or is it one of those things that won't be
economical to source / repair ?

Thanks in advance
Adrian
Suffolk UK
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