20 Jun
1999
20 Jun
'99
9:04 a.m.
Hmmm, now this doesn't look particularly good.
I manually pushed the carriage to the right and it worked. (ie the pawl
re-engaged.) Then I typed for a while and then it stopped spacing in the
middle of the page. Manually push it one character space and it works again.
By observing the mechanism, I can see that there is one position of the
spacing ratchet that doesn't seem to allow for spacing. It could be a
broken tooth but I can't tell from looking at it from the side. Another
interesting tidbit is that when I hit "return" the carraige _stops_ at that
tooth, even if this means stopping mid page!
Now a damaged tooth could be used to explain the first behavior but not the
second I don't believe. The cardboard/spacer thing is still in there and it
doesn't seem to harm anything so I still can't tell if it is supposed to be
there or not.
I have a complete (but dirty) typing unit available as an organ donor if I
can deduce the cause of the trouble.
--Chuck
Spacing Ratchet shown on page 75, part number is 181077 for the gear at the
bottom of the spacing ratchet, it apparently attaches with two bolts, the
carraige stops when the feed pawl is lined up with one of the two bolt
heads on the top.
20 Jun
20 Jun
12:07 p.m.
New subject: "Organ doners" was: Re: ASR-33 more on spacing
Upon the date 11:04 AM 6/20/99 -0700, Chuck McManis said something like:
Hmmm, now this doesn't look particularly good.
I manually pushed the carriage to the right and it worked. (ie the pawl
re-engaged.) Then I typed for a while and then it stopped spacing in the
middle of the page. Manually push it one character space and it works again.
By observing the mechanism, I can see that there is one position of the
spacing ratchet that doesn't seem to allow for spacing. It could be a
broken tooth but I can't tell from looking at it from the side. Another
interesting tidbit is that when I hit "return" the carraige _stops_ at that
tooth, even if this means stopping mid page!
Now a damaged tooth could be used to explain the first behavior but not the
second I don't believe. The cardboard/spacer thing is still in there and it
doesn't seem to harm anything so I still can't tell if it is supposed to be
there or not.
I have a complete (but dirty) typing unit available as an organ donor if I
can deduce the cause of the trouble.
Chuck and others:
I'm cleaning out some extra stuff I don't want as a result of moving out of
our old house. I have a couple of 33's which are only good for parts.
Anybody need parts for their typing unit, keyboard unit or UCC-6 CCU units?
Please let me know ASAP as they will be hitting the metal recycle bin next
week.
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
Check our redesigned website!
URL: http://www.antiquewireless.org/
1:16 p.m.
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2:48 p.m.
New subject: Success Re: ASR-33 more on spacing
(I wrote)
doesn't seem to harm anything so I still can't
tell if it is supposed to be
there or not.
At 11:16 PM 6/20/99 +0100, Tony wrote:
I am almost sure it shouldn't be...
Well, on the theory of fix the simple problems before moving on to the
harder problems. I removed this bit of floatsam and the carraige now
correctly traverses the platen without stopping!
I found the picture of the reader clutch control based on your reference.
Using those part numbers this is what I have going on the last "local mode"
problem (reader doesn't stop)
The arm #183098, doesn't come back far enough toward #185775 to
successfully disengage. I'm assuming that when it is correctly adjusted
that if I push it past into the leaf spring the next transmit should
disengage it again.
--Chuck
2:48 p.m.
New subject: Success Re: ASR-33 more on spacing
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3:58 p.m.
New subject: Success Re: ASR-33 more on spacing
At 12:48 AM 6/21/99 +0100, you wrote:
This I don't quite understand. The 185775 is at the
rear of the machine,
behind the 183098 link, right?
Yes.
In the idle position, the link should be far forwards.
The plastic tip
should be pressing on 183056 contact, keeping the leaf switch open. The
little 'step' on the underside of the link should be caught on the end of
the 185775 armature extension.
Hmmm, ok, the small step is pretty small and it doesn't "hold". That is to
say if I push the lever forward and engage the step, it holds until a
character is printed and then the vibration causes the arm to move off the
step and we're off to the races again.
When the solenoid is energised, it attracts the 180844
armature. This
releases the link. It moves backwards, allowing the contacts to close
(and thus energise the reader), and trips the clutch.
So the solenoid should pull the armature "down" correct? (thus freeing the
"latched" arm.)
While the reader is running, the solenoid remains
energised. The link
moves forwards at the end of each character (opening the leaf switch, and
thus stepping the reader), but the link does not latch. The armature
extension does not contact the link.
Hmm, it always seems to contact it, just it isn't "holding" it as well.
This BTW was the linkage that was disconnected originally. The 183098 arm
wasn't even in contact with the 185775 armature extension. Now on my
extension there are a couple of "pips" that I assume are guides to keep the
183098 arm aligned with the armature extension. (which is adjustable with a
couple of screws)
When the reader is stopped, the solenoid is
de-energised. The armature
moves upwards (spring 101386). This time, when the link moves forward,
the 'step' catches on the end of the 185775 armature extension. The link
is held in the forwards position. The leaf contacts are held open (reader
deenergised). The clutch is disengaged.
The edge of the step is pretty smooth, I wonder if it has worn down from use?
The other tidbit is that when the 183098 arm moves backward and then
returns forward it often hits the plastic cover over the leaf spring
labelled "high voltage". Sometimes, it gets stuck in that position (just
leaving the leaf spring closed and the reader energized.
My guess is that 187557 is too far forwards (towards
the front of the
machine) to allow the link to catch on it.
Very possibly. I'm locating the adjustment section for this linkage now to
see what the books say.
--Chuck
4:27 p.m.
New subject: Success Re: ASR-33 more on spacing
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3:07 p.m.
New subject: Parts Id ? Re: ASR-33 more on spacing
To follow up my success I pulled out this piece and I'm trying to ascertain
if it belongs in the unit or perhaps fell into the space between the
keyboard and the cover at some other time.
The piece I pulled out is pictured here:
http://www.home.mcmanis.com/asr33/part.jpg
It is rectangular at its base, made of that stiff paper/cardboard that is
used in teletypes to shield things, and is cut so that a portion can be
bent perpindicular to the main piece. There are score cuts to facilitate
bending.
I'm looking for it in the exploded parts pages but nothing yet.
--Chuck
9143
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9143
days old
7 comments
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