1 Feb
2008
1 Feb
'08
6:35 a.m.
At 12:27 AM 2/1/2008, Paul Anderson wrote:
My books are still in storage,( basement wall are up!
), but I seem to
recall the LA36 had adjustments on the servo. Could the LA180?
Yes, it's basically the same mechanism.
I've sent the maintenance manual to der Mouse for scanning.
-Rick
1 Feb
1 Feb
9:37 a.m.
On Feb 1, 2008, at 6:35 AM, Rick Murphy wrote:
LA36 and LA180 are the same mechanism? Are you sure? I don't
recall much similarity there, especially in terms of speed.
-Dave
--
Dave McGuire
Port Charlotte, FL
My books are
still in storage,( basement wall are up! ), but I
seem to
recall the LA36 had adjustments on the servo. Could the LA180?
Yes, it's basically the same mechanism.
I've sent the maintenance manual to der Mouse for scanning.
1:18 p.m.
At 09:37 AM 2/1/2008, Dave McGuire wrote:
On Feb 1, 2008, at 6:35 AM, Rick Murphy wrote:
LA36 and LA180 are the same mechanism? Are you sure? I don't
recall much similarity there, especially in terms of speed.
That's what I meant by "basically". :-) It's quite similar.
Unidirectional, belt-driven. Motor has a sensor disc on the back for
position pickup. I doubt there's any parts that are interchangable,
though, so you're correct.
-Rick
My books
are still in storage,( basement wall are up! ), but I
seem to
recall the LA36 had adjustments on the servo. Could the LA180?
Yes, it's basically the same mechanism.
I've sent the maintenance manual to der Mouse for scanning. 
4 Feb
4 Feb
3:50 p.m.
In message <200802011819.m11IJ3ch015535 at mail.itm-inst.com> you wrote:
At 09:37 AM 2/1/2008, Dave McGuire wrote:
I just managed to fix the problem with the init-sequence.
There was a faulty IC "9601PC" by which the controller senses that the
servo-motor isn't able to turn (paper jam).
The LA180 has the same sensors on the back of its servo-motor as the LA36
to count the dot colums and to determine the direction of carriage movement.
It took me one hour to adjust the sensors mechanical and electrical (and i have
a oscilloscope to watch the signals against each other).
Now on power-up the carriage moves slowly to the left side where it stucks for
a short while and then moves a litte (a few mm) right - no error bell!
On setting the selftest switch to the ON position (paper loaded) an putting the
machine ON-LINE, the paper ist continiously feeded but no character is printed.
Any idea?
Axel Harten.
On Feb 1, 2008, at 6:35 AM, Rick Murphy wrote:
LA36 and LA180 are the same mechanism? Are you sure? I don't
recall much similarity there, especially in terms of speed.
That's what I meant by "basically". :-) It's quite similar.
Unidirectional, belt-driven. Motor has a sensor disc on the back for
position pickup. I doubt there's any parts that are interchangable,
though, so you're correct.
-Rick
My books
are still in storage,( basement wall are up! ), but I
seem to
recall the LA36 had adjustments on the servo. Could the LA180?
Yes, it's basically the same mechanism.
I've sent the maintenance manual to der Mouse for scanning. 
5 Feb
5 Feb
6 p.m.
I just managed to fix the problem with the
init-sequence.
There was a faulty IC "9601PC" by which the controller senses that the
servo-motor isn't able to turn (paper jam).
I don't know how similar it is to the LA36, but on the latter printer
there is no 'home sensor' to dtect when the printhead has got to the left
side. Instead, at power on, it tuns the motor and bangs the head into the
left side plate, then detects that the motor has stalled (much as you've
described), and thne running the mtoor fowardsfro a few pulses. That's
the home position.
There's a nasty failure mode of this, though. The plastic key in the belt
sprocket breaks and the sprocket slips on the motor spindle. As a result
the motor never really stalls, it keeps on turning against a rather heavy
load. Since hte logic board doesn't detect the stall, the motor keeps
running, gets very hot, and in the ned the insulation burns off the windings.
This happend to an LA36 at Bristol University when I was there. A friend
and I spent an afternoon rewinding the motor (a replacement motor was
excessively overpriced!0.
-tony
6008
days inactive
6012
days old
4 comments
4 participants
participants (4)
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ard＠p850ug1.demon.co.uk -
harten＠injectstar.de -
mcguire＠neurotica.com -
rick＠rickmurphy.net