[R-1051] CPS Problem with "B" Model

[Barry Hauser]

Hi Larry

Probably should wait for a more experienced 1051'er to chime in but while 
yer waitin'...

As I recall, the flashing light is only a warning - -maybe also due to 
legal/gov't contract considerations in view of the guaranteed specs on 
stability and frequency accuracy on the R-1051.  When you switch into 
vernier, you do not have the top stability/accuracy.  The flashing light is 
an add-on to warn you of that.  It probably should be labeled "Caution --  
YMMV, kiddo".

And, as I recall, it's just a simple flasher circuit -- an indicator of the 
vernier switch position, not anything integral to any other circuit.  I also 
seem to recall a post from Nolan way back or someone that there's a small 
capacitor in the vicinity of the light which when bad results in no 
flashing.  (Might just be what they used to call a "relaxation oscillator".)

It may or may not be on that board, but you might be able to eyeball it as 
it's not far from the vernier control and bulb.  Or may be that the bulb is 
burnt out if it doesn't light up at all.  Anyway, it's a fairly low-tech 
situation and fix.

Hope this helps.  I think someone has some R-1051 manuals on line.  I'll 
check where I think I saw some and get back to you if I find them.

Barry





Larry wrote:

>I was able to get the R-1051B working that had the stuck motor that turns 
>the crystal switch.  Now, I have another problem I need to deal with and 
>that is the CPS switch does not function.  The vernier works OK, but the 
>light doesn't flash.
> I don't have a schematic for this section of a "B" model.  I have a "D" 
> model book, which appears to be different, and the book I found on the 
> internet in .pdf format is for a "plain" model, which is also different.
>
> Can someone scan that portion of the "B" model book, or is anyone 
> interested in swapping a "B" book for a "D" book?  I think the part I need 
> is the schematic for the board mounted next to the vernier control and CPS 
> switch, and for the 100 CPS module.
>
> Thanks,
> Larry W4LK
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