Another one Tek 2235 power supply problem

You should find the schematic and/or maintenance manual on-line for this scope. Maybe the Techtronix web-site will have one for free.
Tek usually mark their parts with their own numbering system, different from JEDEC.
There are cross references here in the 'Resources' section, and on-line to cross reference Tek numbers to JEDEC
industry standard parts numbers that you should be able to locate easily.
Those blinking LED's should be diagnosed in the manual, as to what they mean.

 

You shouldn't have a problem finding the manual online for this scope. I also own a 2235.
Tektronix doesn't make parts, they buy them from component manufacturers and install them in their equipment.
Tek usually just tells those component manufacturers to put Tek numbers on them.
(I wouldn't run that scope any more without at least replacing the parts you removed, or you may further damage
the scope).
I'm not online over weekends. If you post follow-up questions, someone here may help, or I'll be back online next week.

 

Sir georgegr79 . . . . . . . .

I think that you are grasping for straws and / or barking up the wrong tree, those 4 diodes of the +/- 8.6 volt supply needed testing with one lead each out of circuit . . . . which you did . . . .and they passed, with good junctions .

Tell me what test equipment you have, and if having another scope that we can measure rise time of DC voltage.

In the interim, I will prep up a marked up, and all encompassing block diagram and a specific marked up schema of just the power supply section.

73s de Edd

 

Sir georgegr79 . . . . . . . .

INITIAL INFO :

I was prepping up a list of all of that units electyrolytic filters, as I was expecting some to be bad in the respect of that power supply going into its burst mode intermittent operation. After all, that unit has YEARS of operation behind it, and that units switch mode power supply electrolytics take a banging.
To do proper, I personally would change out the whole cluster.

Above, was the listing on the diodes that you queried about.
Your original uits were UNITRODE 200V at 750 ma units with a fast switching time spec.
If you have two of the original diodes left on the board, I would expect their cases to be of my top picture, I used to pull those out of a small UNITRODE white box of 100s to be used . . . . usually by the sets of 4' s at a time.
I now see that Tejas Instrumentations is now Sugar Daddy of UNITRODE and they must have mainly wanted their UA3840 series of switchmode controller IC technology . . . . and as for their sideline diode business . . .be damned.

I was thinking of suggesting a later UF4007 . . . . thats a hot rodded 1N4007 on the switching spec . . . . to replace those 4 units, with with a better safety threshold spec of 1KV instead of the 200V and a current uppage to 1 A instead of the 750 ma. AND that unit ALSO having the fast switching spec. . . . . . that the inverter section operates at.
I do see now that UF4000 series are being degraded to a " not used in new design category " . . . . while you can still get new old stock.

When I can no longer can get the UF4007 I guess that I will move on to one of the Philips or Vishay BEAD cases such as:

http://www.alliedelec.com/vishay-small-signal-opto-products-ssp-byv26e-tr/70061680/

73s de Edd