[GreenKeys] Model 28 clean and lubricate

[John]

Probably is lubrication, at least I'd try that first.  

I discovered that my iPhone 6 can take slow motion videos.  This can be useful for troubled shooting if you can get a clear view of the area in question.

No letters shift could be a stunt box problem.  I had an occurrence of mouse droppings stick the CR function bar.  But since R doesn't print right I'd fix that first.  Is the R printing some other letter consistently, or just or just any random non R character.

Just random pre-morning coffee thoughts.



John, W9DDD


> On Sep 30, 2021, at 12:23 AM, Harold Hallikainen <harold at w6iwi.org> wrote:
> 
> I got my first look inside a model 28 yesterday as I try to help Mike (
> KD7VRG ) get his 28 running.
> 
> It looks like one or two bits on the receive side are stuck. It prints Y
> correctly, but not R. Also, it will not go to LTRS, just stuck in figs.
> 
> Looking at the right side of the printer, I see one code bar that seems to
> move into place late, like it's gummed up and moving more slowly than the
> others. Though the printer looks pretty clean, I suspect that it needs
> cleaning and lubrication.
> 
> On my model 15, I have been using Valvoline Full Synthetic Advanced SAE
> 0W-20 oil (UPC 7413000916) and Permatex White Lithium Grease # 80345. Do
> these seem appropriate for the 28?
> 
> I cleaned my 15 with Simple Green, largely soaking it and wiping the crud
> off but trying not go get the selector magnets wet. Is that appropriate
> for the 28?
> 
> Once the printer (especially the typing unit) is clean and dry, I find the
> lubrication instructions at
> https://www.navy-radio.com/manuals/tty/217B-5903.pdf#page=169 .
> 
> Does this sound about right? I think the machine is very close to
> operating properly but just has some sticky parts.
> 
> Thanks!
> 
> Harold
> https://w6iwi.org
> 
> 
> 
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