Re: Tek 2235 power supply

"bico959 via ElectronicsKB.com" <u37735@uwe> wrote in
795b06ab63e76@uwe:">news:795b06ab63e76@uwe:

Thanks Jim. I did replace it, but with a GP 100. Do you think that
might be it? Should it be low ESR to work?

it definitely should be low ESR.
It gets supplied by the HF switched current from the inductor T906.


Also, do you know of a
common cross for Q930 and Q928?

http://www.sphere.bc.ca/test/tekequiv.html didn't list any for those.
I suspect gen purpose xstrs would work for them.

Thanks... BTW I also have a tek 2215 with power problems (go figure).


BTW,the 2215 PS is essentially the same circuit as the 2235/36.
the part designations are different however,and the 2215 pre-reg limits at
~0.9A instead of 1.3A.

you can isolate the pre-reg by lifting the .51 ohm res R949,disabling the
inverter section.
You should cook up some load R for the pre-reg.
I don't know what value a minimum load would be.
I used a bunch of parallel 7W W-W resistors I had on bench stock. 45-
100ohms should work,but pay attention to their wattage.

--
Jim Yanik
jyanik
at
kua.net
.

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