[GreenKeys] Figures characters printing lightly

[Steve Garrison]

Found the issue!  But will be unable to repair on site.

The ribbon-guide mounting bracket (Ref. #10 on Fig, 90 of the TT-4 service manual) is loose but to retighten the two mounting screws (Ref. #9 on Fig. 90) at least the platen assembly will need to be removed.  Fig. 90 is on page 110 of the TT-4 manual on Nick England's Navy Radio web site.
Here: http://www.navy-radio.com/manuals/tty/kleinschmidt/tt4ab-11-5815-206-35-5908.pdf


Steve G./N4TTY

-----Original Message-----
From: Duncan Brown <duncanancy at earthlink.net> 
Sent: Monday, July 8, 2019 9:20 AM
To: Steve Garrison <steve.n4tty at gmail.com>
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Figures characters printing lightly

Steve,

Yes, it could be the ribbon lift - I was going to mention that, but the thought never got as far as my fingers!
I don't remember the details of the adjustment, just that there is one.

Let us know how the texting works - I'd like to do something like that at the AWA museum.

Have fun,

Duncan
K2OEQ

On 7/8/2019 04:58, Steve Garrison wrote:
> Duncan the characters are in line OK (figures characters are just faint) so I'm not going to mess with platen for the moment. I'm now thinking it is the ribbon lift that isn't lifting quit high enough when the platen shifts to its upper position causing the character on the top of the pallet not to have the ribbon between it and the paper.  Therefore all I'm getting on the paper is some residual ink on the type face.
>
> This is a TT-4A, so the adjustment is a small star wheel that shortens or lengthens the linkage when rotated.  I'll have to experiment with it after getting my demo set up later today as I have never adjusted this before.  Clockwise or counterclockwise that is the question!
>
> I'll be demoing the TTY texting setup I have based on John Nagle's work at the ARRL booth at an IEEE conference in Atlanta this week.  I decided to use the TT-4 as we are limited on space and it is the smallest of my stash of TTYs.
>
> Steve G./N4TTY
> Sent from my iPhone
>
>> On Jul 7, 2019, at 9:13 PM, Duncan Brown <duncanancy at earthlink.net> wrote:
>>
>> Steve,
>>
>> Adjustment of the the platen is basically the same on TT-4 & TT-98.  You type alternate "T" & "5" and the tops should be in line.  As I remember, there are 2-3 adjustments that affect this and you may have to repeat them &/or do them in a certain order for best results.
>>
>> Good luck & have fun,
>>
>> Duncan
>> K2OEQ
>>
>>
>>> On 7/7/2019 13:03, Steve Garrison wrote:
>>>
>>> But almost all letters characters seem OK.
>>>
>>> This is on a TT-4.
>>>
>>> Duncan are you around?  You appear to be the TT-4 guru.
>>>
>>> Never had this issue on a TT-98, or other variant, unless it also appeared that the characters weren’t striking the platen in the same plane.
>>>
>>> Steve G./N4TTY
>>>
>>>
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