Hello,
I have a Temex RMO 10MHz rubidium osci but no lock signal comes out.
Checking the RS232 diag code I have the flwng hex code:
7D 04 39 8B 41 4A 48 CB
where the second HEX code indicating the Rb signal level which is in my case
is almost zero and it should be 1,0 to 3,3 Volt.
Opening up the unit/case I found that the 20MHz xtal osci signal level is low,
it stops oscillating when I put very close to my finger-tip....and has to be a
power reset in order to get it oscillating again...??????.......touching other
pars on the PCB found also that it locks to a freq and
the Lock detect level is OK / TTL / but the 10MHz freq is almost 180 Hz
LOW......
playing around with cooling spray on different spot on the PCB sometimes is
stops 10MHz and the lock detect voltage is OK but only a few sec and then
drops out again...... the unit prefer to lock to the lower freq and just
sometimes locks for a few sec to 10MHz exactly ....
I have no manual ie. circuit diagram and looking any good advise if somebody
had some hands-on experience to repair this unit. I assume it has problem with
the 90MHz VCO circuit........?????
Please help.
Many thanks and rgds,
Ernie.
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