14 Nov
2002
14 Nov
'02
1:54 p.m.
I consolidated Tony's and Dwight's comments onto one
post... thanks to both for your comments so far.
Ah... Do you hapeen to know if the original position
of the brush holder
was way out? If so, then it's possible the previous
owner tried to
compensate for that using the 'rangefinder'
adjustment on the RX module
(the slider + scale near the receiving magnet). Have
you treid the affect
of this adjustment?
I tweaked this last night to see what would happen,
but there was no improvement. But it was an
interesting exercise anyway.
You can elminiate the keyboard by trying the reader.
If the reader works
perdectly, then the keyboard must be the problem. My
guess is that it
won't, though. You can open the tope of the
rrrreader
and hold the tape
sensor down by hand. That will read continual
Rubouts. Or hold down some
the pins too to get different characters. Of course
if you have some
correctly punched tape, use that.
Good idea - I re-connected the reader and tried it.
The codebars track exactly what the sense pins read,
so that would point to a keyboard problem.
Hang on... What happens if you press a (printing) key
-- say 'A' and
REPT. Do you get consistently correct punching? What
is printed? Always
the same (incorrect) chaaracter? (if so, which, and
where is it on the
cylinder). A few different characters (again, where
are they on the
cylinder)?
Considerable improvement after working over the
carriage again. Many of the characters now print
correctly using the REPT workaround. Some examples
that don't:
Prints
Typed As
----- ------
Q S (consistently)
8 : (consistently)
9 ; (consistently)
X P,Z
E E occasionally C
W W occasionally G
A C
Haven't had time to analyze these yet in terms of
where they lie on the typewheel.
Besides checking the clearence, it might be a good
idea
to remove the keyboard and watch things while hitting
a key. You might see something a little sluggish.
You'll need to manually reset it after each
keystroke.
It is a lot easier to see things when the machine
isn't
jumping everytime you hit a key.
Dwight
I'll try this again. I am sure that this is keyboard
related.
List of other things to fix:
dashpot - carriage always sticks at l/h side.
reader doesn't advance tape - presumably it should.
Regards,
Dave
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