ASR33 linefeed solved! So here is the next ASR problem.......

From: Dwight K. Elvey <dwightk.elvey_at_amd.com>
Date: Mon Oct 21 13:29:01 2002

>From: "jos.mar" <jos.mar_at_bluewin.ch>
>
>
>
>The problem with my ASR33's linefeed has been traced to a disintegrated piece
>of plastic on the upstop bracket of the linefeed linkage. (item no. 18708)
>Without this plastic piece the upstop vertical adjustment range is too small
>for a reliable linefeed. A few windings of plastic tape did the trick.
>My ASR now prints out a sourcecode papertape quite nicely.
>
>Thanks for all the tips. As to WD40 : I never use the stuff...
>
>The next, and hopefull last problem of my ASR : the keyboard.
>It sometimes misses a bit ( B becomes A etc. ) This is more than likely
>curable by adjusting or replacing the contact wires.
>However the keyboard also quite often gives out 2 characters for each key
>pressed. I am at a loss as to what could cause this behavior. Tips anyone ?

Hi
 It is more likely that you just nees to clean the contact surfaces,
rather than replacing the wires. They are plated and should last
a lifetime.
 The double printing is most likely that the keyboard isn't getting
reset after a key is hit. There is a bell crank that connects the
printer to the keyboard that is to reset the keyboard and lock
out a double key. It is most likely that the travel on this isn't
enough. Check the manual, there is an adjustment someplace.
 Here is a trick that I used when I was in the service. Things
happen so fast in a teletype ( I worked on the older Klienshmit
type with the moving box ) that it is often hard to tell just what
is causing problems. I has a switch on with some wire that I could
use to shut the motor off, without turning off the rest of the power.
The motor power is on a screw strip, someplace.
 I could then turn on the main power with the motor on and lock
up all of the clutches. I could then turn the motor off and run
things from the keyboard manually by turning the fan on the motor.
One can't see everything this way because may things have an
interial effect but it was a lot of help.
 Make sure that if a clutch is tripped that you get it fully locked
again. When the motor is spinning fast this isn't a problem
but manually, they won't lockup and will drag. It is hard to
describe this in text but you squeeze the latch part that catches
on the clutches. Some time the clutches don't latch up on a powerup.
I always hit a key on each power up to make sure they are not
dragging. If they are dragging, you'll burn up a clutch in just
a few minutes.
 Manually, you should be able to stop things, while the keyboard
wires are making contact. You can then check each one for voltage
drop as the distributer selects each to the printer. You can
find an open, quickly, this way.
Dwight

 
>
>My ASR33 came with a reasonable number of original replacement parts. Should
> anybody be in dire need of a part to get her/his ASR running again...
>
>
>
>
> Jos Dreesen.
>
>
Received on Mon Oct 21 2002 - 13:29:01 BST

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