[GreenKeys] ASR-33 going crazy in local mode

[Teletypeparts]

Seth,

A couple of possibilities.  

1.  When you replace the carriage, you didnt get the carriage levers on the correct codebars.  Check this first.  The rearmost slider goes on 
P
S
The print suppression codebar.  See pic #2.

2.  The three little levers under the carriage that control the typewheel's vertical movement (I sometimes refer to them as fingers hanging down) are sticking together.  See pic #1, circled in red and each is marked with a red dot.  They, and the shaft they are on need to be sprayed with solvent and freed up and then lightly lubed with 3 in 1 oil or the like.  About the only place to use 3 in 1 oil on a 33.  You dont have to remove the carriage to free the fingers up.  

Wayne






-----Original Message-----
From: Seth Morabito <lists at loomcom.com>
To: greenkeys <greenkeys at mailman.qth.net>
Cc: Teletypeparts <teletypeparts at aol.com>
Sent: Mon, Oct 7, 2013 1:05 am
Subject: Re: [GreenKeys] ASR-33 going crazy in local mode


Hello Wayne and the Group,
Well, you were absolutely right -- the answer-back drum was now too far back, 
nd the suppression contact was touching.
I aligned it according to the manual, but then I got the "constant 0's" problem 
gain! I almost gave up for the night, but then I figured out the real problem:

EBCAK. "Problem Exists Between Chair And Keyboard" :^)

 had very stupidly not aligned the brush holder when I put it back on, so it 
as completely out of alignment. It wasn't in the correct stop position, so ALL 
f the timing was completely off. Of course it wouldn't work. This is a reminder 
o myself to read the darn manual!
So, first, the GOOD NEWS: I aligned the brush holder, and it behaves almost 
erfectly in local mode now!
Now, the BAD NEWS: Some characters are not printing correctly. Here is my 
bservation of what happens:
When I press any of 0 1 2 3 4 5 6 7 8 9 0, the correct character is printed.
hen I press any of Q R S T U V W X Y Z, the correct character is printed.
BUT!
When I press any of A B C D E F G H I J, the characters Q R S T U V W X Y Z 
respectively) are printed in their place.
When I press any of L M N O, the characters \ ] ^ <- (respectively) are printed 
n their place.
If you're familiar with ASCII coding and the ASR-33 typewheel, you've probably 
lready noticed the same pattern that I did.
At first, I was sure that things were not being coded correctly. I thought that 
SCII bit 5 (corresponding to the No. 5 codebar) was stuck "on" somehow. But on 
loser examination, this is not the case.
When I type A B C D (etc...), those characters are being coded correctly. I even 
unched some tape to make sure I wasn't imagining it -- the correct bit pattern 
hows up on the tape. A and Q punch different, B and R punch different, and so 
n.
So, the problem must be in the carriage assembly. It is raising the typewheel to 
he 4th row when it should only be raising it to the 2nd row.
Visual inspection doesn't show anything out of whack. I guess I'll have to 
emove the carriage assembly and see if I can figure out what the problem is 
ithout actually taking it apart.
-Seth
On Oct 6, 2013, at 11:30 AM, Teletypeparts <teletypeparts at aol.com> wrote:
> Seth,
  
 Oh boy, the answer is almost surely in the AB positioning.  I never remove the 
B contact block because it is difficult to replace it perfectly.  There is a 
ontact wire in the AB in the middle that is called the suppression contact.  If 
ts touching the contact bar you will get nothing from the kybd.  Its the one 
ith the little rectangle brown phenolic insulator on it. 
  
 With the AB in home position adjust the AB block forward and backward till the 
uppression contact matches the other 8 contacts and has the same distance from 
he contact bar.  Sometimes the suppression contact is a little more away from 
he contact bar than the other 8.  Not touching the bar is important.  Make sure 
he contact block is squarely positioned in the base of the 33, not twisted in 
ither direction.  Unfortunatley, the position of the Here Is white tab also 
ffects the suppression contact, so maybe you should adjust the contact block 
lightly until it seems to rotate and fall into the home position correctly and 
hen the Here Is white tab adjustment to get the proper positioning of the 
uppression contact.  I am changing my suggestion midstream here as I think 
bout it.  The two adjustments affect each other so it will be a trial and error 
ffort.
  
 Wayne

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