On 05/09/2012 12:23 AM, [email protected] wrote:
Hi Bob,
The DB-9 looks fine even with magnifying glass.
The good one has a MAX232EWE IC, the faulty has a TC232EOE. I see
RS232-level coming in at pin 13 and going inside the Tbolt at pin 12 (ttl
level).So there should be no problem there.
Have also swapped PSU board, so the problem is inside the actual GPSDO board.
If you now have opened them up, try A/B check pins for clocks etc.
I'd check if the clock works, internal powers works and that the reset
has been released. The easy basic stuff.
The 232 level IC is a dual channel RX/TX translator. Anyone know what the
second 232 port is used for?
Trace the leads and see if there is hand-shake signal on the DB-9
(likely) or if it in fact is a second serial port (less likely).
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
