Re: Delco AM/FM/Cassette, 1983 Buick (tape problems)

From: Mark D. Zacharias (mzacharias_at_yis.us)
Date: 10/10/04 

Date: Sun, 10 Oct 2004 06:46:49 -0500

Sound like the replacement motor you put in their is running backwards.
That's why the speed won't regulate. In other words, if it's a
clockwise-rotation motor you need, your unknown sub is a counterclockwise
model. You'll need to try a motor of the correct rotation direction. All DC
permanent magnet motors can be changed if you can change the orientation of
the bottom cap assembly 108 degrees. Many later ones are "keyed" to prevent
this.

Mark Z.

Mark Z.

"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0410092025.14dce772@posting.google.com...
>I have an old Delco radio which I salvaged from my 83 buick before it
> went to its final reward. The radio has been in and outlived 3 of my
> work vans but now it needs work on the cassette section. It started
> dragging very badly and tapes sounded awful. I replaced or resurfaced
> rubber parts as needed and it seemed to improve but not for long. I
> finally pulled the motor and although it seemed to run ok with no load
> as soon as I put a slight drag on it it stumbled and stalled a few
> times. I opened it up resurfaced the commutator and brushes,
> lubricated it and tried it out. It seemed much better under load and I
> reinstalled it into the transport only to have the same speed problems
> start up once again. I pulled the motor and it is once again stumbling
> under load so I don't want to mess with it any more. I subbed a motor
> from an unknown source to try the unit out. I had to power it from my
> bench supply and adjust the voltage down to 5.0 volts for proper
> speed. It seems to run decently this way but not knowing the motor's
> voltage rating I may not be driving it properly to achieve maximum
> torque and so I would not want to leave things this way. I would also
> have to build a little LM317 circuit to power the thing and I really
> don't want to do that if I don't have to either.
> Does anyone have any of these old Delco radios possibly kicking around
> and if so I was wondering if you might have a good motor or even a
> complete transport you would be willing to sell me.
>
> The radio information follows:
> Radio appears to be a Delco.
> Service Ref. # 30BCC31
> Part # 16008160
> Return # 996742
>
> The motor information follows:
> Motor is a Matsushita.
> Model # MMT-3RF2H
> Date: 05Nov82AA-1
> I don't know the RPM's of this thing but it is marked and runs on
> 13.2VDC
> If you need any further information please let me know. Thanks for any
> help you may be able to offer. Lenny Stein, Barlen Electronics

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