"Angus Thomson" wrote in
:

Hi

I recently aquired an old(ish) Tektronix digital scope which is faulty
and does not start up; instead, the power turns on for 1/2 of a second
then off for 1/2 a second and a 'clicking' noise comes from the unit
(this process repeats). I take it this is a faulty power supply,
possibly tripping out due to excessive current being drawn. I have
heard this problem has occured on other Tektronix scopes; has anyone
had any experince of this fault, and if so, where exactly does the
problem lie?!

Thanks!

Angus Thomson




Bad news here;TEK did not make service manuals with real schematics and
component parts lists for the TDS series scopes,and the PS were purchased
units.The TDS scopes are intended to be module-exchange service only,and
you will have to check the LTPS( long term product support) list at
www.tek.com to see if your particular scope model is still supported.But
TEK support will be expensive.

I would begin by using a DMM to check the rectifier diodes in the PS,and an
ESR meter to check electrolytic caps.

--
Jim Yanik,NRA member