12 Jun
2008
12 Jun
'08
3:45 p.m.
I've started tracing back from the logic
controlling the
LINE and CTS indicators but haven't found anything obviously wrong as
yet. I have however read some funny-looking voltages off the 7406 in
this part of the circuit: 11.something volts while the datasheet says
30. Could of course be down to my test equipment as I'm limited to a
basic digital multimeter at the moment.
Before you start tracing things out, you might want to track down
the actual USER manual for the LA100.
(It's not on Manx or Bitsavers)
As far as I know, the LA100 logic circuitry performs a
SELF TEST on power-up, and will illuminate various LED's
above the keyboard, depending on the problem found.
The user manual may tell you what the various lights
are trying to tell you. (Paper jam, etc)
T