[GreenKeys] M28 motor for LXDB3 tape reader

[Duncan Brown]

Jerry,

Thanks for the info!  That gives me a better feeling about continuing 
with this project.

Have fun,

Duncan
K2OEQ

On 27-Jul-22 13:45, Jerry Murphy wrote:
>
> Hi Duncan:    Teletype called their standard 1/20th hp, 3600 RPM motor 
> the LMU3.  The
>
> Bell System called the same motor a 28A.  No difference at all.  The 
> motor leads on the
>
> LMU3 were adequate for almost all installations.  The most notable 
> exception was the
>
> dome mounted auxiliary reperf used in M28 ASR sets.  The motor leads 
> had to be fished
>
> out of their normal exit hole in the motor cradle and re-routed in 
> such a fashion so that they
>
> would barely make it to the terminals on the base.  Just adding some 
> additional length to
>
> the motor leads should solve the problem.
>
> Regards, Jerry Murphy
>
> -----Original Message-----
> From: Duncan Brown <duncanancy at earthlink.net>
> Sent: Jul 27, 2022 9:58 AM
> To: Green Keys <greenkeys at mailman.qth.net>
> Subject: [GreenKeys] M28 motor for LXDB3 tape reader
>
> I have a M28 stand alone tape reader (thanks, Bruce), LXD7 on LXDB3 
> base (with label TT-423/TSC-23) that I am checking out.
>
> It looks like the motor has been changed out, as the motor power wires 
> (with spade lugs) are at least 2-3" too short to reach the power 
> terminal strip.  The motor does run.  The only ID on the motor bracket 
> is " Motor unit 28A".  The motor casing says "Teletype Corp." on it 
> and "Motor No. 5SC18L08", which doesn't sound like a normal Teletype 
> corp. number. (motor manufactured by GE)
>
> I can't find anything that tells me what motor should be in this unit. 
> The parts bulletin for the LXDB (1161B) just says "for Motors refer to 
> Bulletin 295B".  But 295B does not mention the LXDB base. Just that 
> the LMU3 is the standard motor. Did all LMU3s have the same wire length?
>
> Its not a problem to extend the existing motor leads, just wondering 
> why the leads are not long enough and/or do I have the wrong motor for 
> this unit.
>
> This unit has undergone some mods as the external wiring (signal and 
> two remote control lines) was all done with zip cord.  Also, the is a 
> SPDT relay in the base that gives external control of the motor and it 
> is also wired with the same zip cord.
>
> If this is the correct motor, why is the cabling too short?
>
> Thanks,
>
> Duncan
>
> K2OEQ
>
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