Have you tried a loop back connection, short pins 2 and 3 and a terminal
program? You may have to disable hardware handshaking in hardware
manager for that USB device or possibly a baud rate problem.
Mike
On Fri, Nov 04, 2016 at 08:23 PM, Dave Hallidy wrote:
Hal-
I took your suggestion and sure enough, I can see on the scope that it
puts
out a string on power up. I'm sure that's why SatStat gives me a
"Communications established- please wait" then "Checking echo". But
then it
all seems to fall apart, because after that, it drops back to "Trying
to
establish communications" and "No response..." until I power down then
back
up, and it repeats the cycle.
I don't have any real info on power supply voltages, so I don't know
what
they should be. On power up, it goes through the cycle of briefly
lighting
the LEDs on the main board red, ending with the green blinking one on
the
main board at the same time cycling through the front panel LEDs and
ending
with just the power LED lit. I can pull it apart and check for caps
needing
replacement if you think that might be a cause of this.
Dave
-----Original Message-----
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal
Murray
Sent: Friday, November 04, 2016 6:56 PM
To: Discussion of precise time and frequency measurement
Cc: hmur...@megapathdsl.net
Subject: Re: [time-nuts] Newbie With a Z3801 Problem
I would put a scope on the TX line from the Z3801A and power cycle it.
I'm pretty sure it prints out the version string on power up.
Have you checked the power supplies? Or looked for old electrolytics?
--
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