[GreenKeys] Strange CR problem M28

[John, W9DDD]

To report back and to thank those who sent direct suggestions, here's 
the results.

Took the dash pot off again.  Looked closer at the interior. It's black 
inside, but smooth. The XYL being out of plain acetone and not knowing 
what vitamin E in what she had might do,  I opted for plain old rubbing 
alcohol.  I kept scrubbing until no more back came off of the interior 
of the dashpot.  Put a real thin coat of oil inside.  Partial reassembly 
gave me a chance to check it.  It showed signs of being a major 
improvement.  Screw #2 of the go-back-together phase decided to drop 
into the selector area.  So I finished with #3 and flipped the printer 
back on it's feet expecting the #2 to fall out on the table.  No such 
luck.  Flipped back upside down and got out the heavy duty light.  
Eventually saw it and it was in needle nosed pliers reach.  Finished #2 
and then tried a manual CR without screw and ball.  Expected hard bang 
on left margin.  Put ball, spring and screw back it and it was so good I 
tightened the lock nut right away.

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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 10/29/2023 11:42 AM, John wrote:
> I thought I had the more often encountered problem of CR bounce.
> After some head scratching.  I examined print the out more closely.  QUICK is printed with the Q at the left margin.  THE is printed E H T where the E is overprinted on the Q.
>
> So it appear the last 1/2" inch or so of the return is slowed down.  That's about where the dashpot is engaged.  So at this point I've removed the ball and spring from the dashpot.  Still too much "braking" action.
>
> Removed dashpot, verified that all the ports are clear of any obstructions.  Cleaned the interior, but didn't use any solvent, maybe should have.  Replaced dashpot and nothing has changed.  I don't recall there's any lubricant indicated, but going to check those instructions.
>
> I have checked the typebox track motion with the dashpot out of the picture and it slams the left margin as expected.
>
> I need some ideas on what to check next.
>
> John, W9DDD
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