17 DAYS AGO
zapzap 5 pts
mweasner Thanks for your link. I have carefully read all the discussions and learned that
the "Press press" script runs when the Rx and Tx lines of the RS232 port are shorted. However
why it runs also if the RS232 cable is not present?
In this case the Tx/Rx shortening would'nt trigger the script, is it right?
17 DAYS AGO
mweasner 6 pts
zapzap Connector pins in the jack shorting out (dirt, debris, bent) or some internal short
inside the AutoStar itself. Or perhaps a component failure.
15 DAYS AGO
zapzap 5 pts
mweasner the press press problem continues to appear randomly so I have decided to
open the handbox to check the circuit board under the RS232 connector. My multimeter
continuity buzzer has revealed a short between the pins 1 and 2 (Rx and Tx wires) either on the
soldering side of the cb and in the RJ connector. Before to proceed to desolder the RS232
connector I'ld like to know how is possible that sometimes the Autostar starts correctly and
sometimes not if the short circuit is always present. I have noted that the Autostar stops to go in
error if I chill the hbx by an air compressor. Maybe there is a component on the cb that warms up
and shortens Rx and Tx? Could me help the AS circuitry schematics if available somewhere?
15 DAYS AGO
mweasner 6 pts
zapzap There are two articles on schematics on the Helpful Information: AutoStar Info
page. Random component failures can be heat related or just random. If a solder joint is loose or
bad, even moving the handset could affect it.
zapzap 5 pts
mweasner Unfortunately the articles have'nt been usefull for me but I have finally got a
repeatable (not random) behaviour, but you need to know what's happened in the meantime. To be
sure the press press script triggers only when the Rx and Tx lines are shortened, I have wired a
flying RS232 connector with the 1 and 2 wires soldered to a 4 pin peripheral power cable where I
insert the probes of the multimeter. With the scope turned off, I have plugged the connector in the
RJ socket of the handbox and heard to play the buzzer of my multimeter. So I have detached the
multimeter and its probes, but left the connector inserted in the RJ socket, powered the scope and,
with my surprise, the Autostar has performed correctly, then I have simulated alignments, scope
parkings, turned off and on and repeated many tasks without the press press error. Lastly I have
parked and turned off the scope and unplugged the connector from the RJ socket. In this case the
press press error appears randomly. It seems that the RJ inserted in the RS232 socket prevents the
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