Re: Tektronix TDS350 PSU

From: Jim Yanik (jyanik_at_abuse.gov.)
Date: 12/02/04 

Date: 2 Dec 2004 01:09:19 GMT

"Payman Habibelahi" <spam@payman.com> wrote in
news:315lagF35efprU1@individual.net:

> Hi Group
>
> My Tektronix TDS350 Scope will not respond to the front panel power
> switch, it clicks but the scope does not power up. The scope was
> working fine less than a year ago when last switched on. I suspect the
> front panel switch is not really a power switch but a start-up switch
> like on a PC i.e. mains power is permanently connected. I have not
> attempted to diagnose the problem beyond checking externally
> accessible fuses.
>
> Is this a known failure mode? Can someone point me at what to check
> next please, a particular problem with these scopes is no circuit
> diagrams in the service manuals.
>
>
> thanks
>
> Payman
>
>
>
>

Bad electrolytics(ESR)? Then shorted rectifier diodes.
The TDS series uses purchased power supplies,and even TEK had no schematics
for them.Strictly replace if bad.
It could also be a dirty front panel switch(membrane sw,the whole front
panel is one big one,IIRC)

You could find the PS control IC(switchmode regulator IC),and download the
datasheet for it from the IC manufacturer,that would give you a good start. 

-- 
Jim Yanik
jyanik-at-kua.net

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