Corby,
well, the OP Amp was shot.
When I pulled it out, I saw a marking 'BAD 7-8-97' on the side cover.
I was hoping to get it fixed because the 1uF ceramic cap at +15V was
shorted and had burned the 75R resistor.
But, after some serious investigation, I'm realizing that it is
incompatible with the unit I have.
The OP Amp module is marked 05061-6134 Ser. 2136. On the chassis under
the module it says 05061-6092. The 5061A SN prefix is 1540A.
It has an Intech A-240 and 1826-0471 (OP07CJ). The inverting input of
the OP07 is connected to J2/9 by a white wire, as on the schematic.
However, the plug has pins 8 and 9 bridged internally, so the inv. input
is hard wired to -16V. J2/3 is n.c. inside the plug. And, the 8uF cap is
connected between the amp input and output (J1 and J2/5).
I had the OP07 removed and the output of U1 bridged to J2/5 and it was
locking. However, the response to fine adjust changes was very slow.
So, at least the basics are there and I should be able to get it running
if I find the correct OPamp.
Adrian
[email protected] schrieb:
Adrian,
You say it does not lock.
When you put in operate and push the logic reset button does the green
light come on?
What is the 2nd harmonic meter reading?
If too low the logic will not turn on the green light. Raise the reading
via the A7 gain adjust thru the front panel hole.
Is the green light burnt out?
In operate and looking at the control voltage on the meter does the
control voltage "follow" a slow adjustment back and forth of the fine
Quartz adjust?
Corby
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