[R-1051] New Member Help on R-1051B

[Larry]

Paul mentioned that the motor windings are shorted causing the motor to 
brake when the relay is de-energized.  This brings up a question I have 
with a 1051B that I gave up on several years ago.

The module in this receiver that has the band crystals has a selector 
switch that is turned by a motor.  The problem with the receiver is that 
when the crystal switch is rotated to select the correct crystal and the 
power is de-energized to the motor, it coasts until the switch passes 
over the contact before it stops. I don't have the schematic in front of 
me, but my question is that - should this motor be "breaking" after 
power is removed?

By fiddling with it, I can sometimes get the crystal selected and the 
receiver works perfectly.

Has anyone seen this type of fault before?

Larry W4LK



On 02/01/2013 09:19 PM, paul swed wrote:
> Charlie as they mentioned the relays that drive the motor. If they don't
> engage it won't go. The relays are driven by the coding wheels.
> So the frozen grease and such are real possibilities. Its been a while but
> you can pull the motor, disconnect 1 lead to the motor and see if you can
> move it freely by hand. Its not that easy because it is geared. But should
> not be frozen. The reason to remove 1 lead is that in the de-energized
> position the relay shorts the winding to act like a break. Also you could
> hook a 24 V supply up just to the motor to see if that works or stalls.
> Understand that polarity of the supply is very important the wafers only go
> in 1 direction and after years of going in that direction you could damage
> something if you went backwards.
> Paul
> WB8TSL
>
> On Fri, Feb 1, 2013 at 8:35 PM, Charlie Hugg <k5mbx at hug-a-bug.com> wrote:
>
>> It looks like all the chains that I see are metal.  I don't get any
>> indication that the turret is moving when I change Mhz. It only works on
>> the
>> 3 Mhz band.
>>
>> Thanks for all the suggestions. Is there anything that could cause the
>> turret motor not to work other than a bad motor and does anyone have a
>> motor
>> for sale?
>>
>> Thanks, Charlie
>>
>> ______________________________________________________________
>> R-1051 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-1051
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-1051 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> R-1051 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-1051
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-1051 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>