[GreenKeys] Odd Print problems on ASR 33
Lester Veenstra
lester at veenstras.com
Wed Jul 24 21:19:12 EDT 2013
One of the very nice things about the 32/33 is that you can trouble shoot,
in slow motion, with AC removed from motor, by releasing a key and cranking
the motor (by the fan) around while the TD and the typing mechanism are
moving in sync, from the common motor. It allows you to see exactly why
the motions, you expect to see, leading from the selector magnet up to the
type wheel position, are correct or “fouled” up.
On a 28 you had to run it at 100 wpm with the dam GR strobe (at ~ 99 wpm)
trying to see the same thing. No FUN!
Lester B Veenstra MØYCM K1YCM W8YCM
lester at veenstras.com
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From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Clay Archer
Sent: Wednesday, July 24, 2013 1:51 AM
To: Teletypeparts; asekely at hotmail.com; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Odd Print problems on ASR 33
Thanks everyone for your replies. I believe I have narrowed down the
problem. I found a linkage that was sticking when the problem occurred.
I followed the linkage which connects to the “Rotary Drive Arm” through the
“Third Pulse Lever”. The drive arm is sticking under the right “rack” that
rotates the print head. The “rack” is extended farthest on characters like
the letter “O” that is causing the problem and allows the “Rotary Drive Arm)
to get under the right “rack”. It will dislodge by itself with some
characters like “line feed”. I can pull back slightly on the left “rack”
and it will pop back up where it belongs. I have included page 4-48 of the
manual (273B_Mod32_33_TechMan_Jan63.pdf from Bitsavers). I’m not sure if
it needs adjustment or a part is worn. I don’t want to start bending
linkages without knowing what I’m doing.
I appreciate any help you can provide.
Clay
_____
From: Teletypeparts [mailto:teletypeparts at aol.com]
Sent: Tuesday, July 23, 2013 1:30 PM
To: asekely at hotmail.com; Clay Archer; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Odd Print problems on ASR 33
Clay,
Andy has given you good advice, but dont make any adjusments until you check
for debris in the typewheel area, missing springs and broken or loose
carriage bearings as I mentioned before.
Wayne
-----Original Message-----
From: zeke440 . <asekely at hotmail.com>
To: Clay Archer <clay at archerservices.com>; greenkeys
<greenkeys at mailman.qth.net>
Sent: Tue, Jul 23, 2013 4:08 pm
Subject: Re: [GreenKeys] Odd Print problems on ASR 33
Clay
If the tape punches correctly the keyboard and TD are good.... at least the
indication points to a printer problem. You seem to be spot on with "Home
position" of the Typewheel" (Head) being the problem.
The the problem your explaining here is a TypeWheel Rotational problem.
Your prob apears to be a reversed motion of the type wheel after a failed
reset.
Spring tension may explain the intermittent problems or a pry adjustment may
be slipping due to wear or a loose screw ? Although you may find other
problems along the way ...?... its mainly happening to the one incorrect
character and intermittently others
Find Bul 310B Vol 2 Sec 574-122-700TC (Not sure which site I found it
before)
look at the "Carriage area" (pages 50 - 69)
Several "pry point adjustments and Spring tension's that could be the
gremlin here.
2nd row of the type wheel: (movement direction of the type wheel from home.)
G F E D C B A @ H I J K L M N O
|......................| |.....................|
( clock wise counter clockwise)
The type wheel layout can be found in Bul 310B Vol 1 Pg 22 ( I have Iss 3)
and the operation of the rotary positioning mechanism are on pg's 22 - 26.
Does anyone know if they are available on-line anywhere yet?
I can attempt to copy these pages for you if they arn't...
(I have the 310B vol 1 & 2 ASR/KSR/RO principles of operation and
adjustments also Bul 1184B parts.)
Andy
_____
Date: Mon, 22 Jul 2013 01:31:14 -0600
From: clay at ArcherServices.com
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Odd Print problems on ASR 33
I have a model 33 with an intermittent printing problem. Actually, it
seems to be getting worse. I believe it’s in the print head lift / rotate
area and not an ASCII decoding problem. It only happens to a few
characters and not related to a particular bit. It will also punch the
correct bit pattern while printing the wrong character. It will print
correctly all characters except the letter “O” which will print the letter
“N”, then other characters will begin to print wrong like “A” will print an
“I” (but only after trying to print an “O”). Things will go back to normal
after a carriage return. The letter “O” will print correctly at the
beginning of the line a couple times and then start printing “N”, like
OONNNNNNN (all letters should be “O”) but it will punch all “O”’s correctly
on the paper tape. Another example: if I type “AAAAAAAOOOOOOAAAAAA” it
will print “AAAAAAANNNNNNIIIIII” Other characters will print wrong, but
only after you try to print an “O”. It’s like the letter “O” is confusing
the positioning on the head. I think other characters will also cause the
problem intermittently.
Any ideas?
Clay
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