"DaveM" wrote in
:

"David Wright" wrote in message
...
If you get some money send it in for repair and calibration. Cost on
good test equipment is out of site.

"giannibo" wrote in message

...
HELP! Someone know the mainframe oscilloscope Tektronix 7000 series?
I have some 7704 with power supply broken,with same defect: don't
start the oscillator.
Some suggestion??



You can download the manual for the 7704 from
http://bama.edebris.com/manuals/tek/7704/. It should help you figure
out the problem.
The usual suspects are aging electrolytic capacitors.

both in the power supply and the mainframe itself.



just make sure you have a 7704 and not a 7704A. There's a big difference.

although both have complex series-resonant switching power supplies.

usually,you hear a clicking or "chirping" from the PS;it's trying to
start,but something is loading a supply,or a diode is shorted.
Some failures blow a lot of parts....and then the line fuse afterwards.

--
Jim Yanik
jyanik
at
kua.net