Tek 485 Power Supply Problem

I have had this scope for years, and a few weeks ago I turned it on to
use it and it craped out. I was out of the corner of my eye the trace go
out on the scope. It was ticking.
I just got the cd with the manual so I could troubleshoot it without
"blinders on".
Are there any know "common" problems with this scope?

Thanks
Frank

 

[Sam Goldwasser]

items4sale@bellsouth-ANTISPAM-.net writes:

I have had this scope for years, and a few weeks ago I turned it on to
use it and it craped out. I was out of the corner of my eye the trace go
out on the scope. It was ticking.
I just got the cd with the manual so I could troubleshoot it without
"blinders on".
Are there any know "common" problems with this scope?

Check for shorted tantalum capacitors on the power supply (bottom) PCB.
An ohmmeter with a decent low ohms range should work for this.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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[Jim Yanik]

items4sale@bellsouth-ANTISPAM-.net wrote in
news:4037AD03.95836FC6@bellsouth.net:

I have had this scope for years, and a few weeks ago I turned it on to
use it and it craped out. I was out of the corner of my eye the trace go
out on the scope. It was ticking.
I just got the cd with the manual so I could troubleshoot it without
"blinders on".
Are there any know "common" problems with this scope?

Thanks
Frank

Read the circuit description so you understand how this supply works;it's
one of the most complex of any TEK scope. (series-resonant switching PS)

--
Jim Yanik
jyanik-at-kua.net