Ed Heath wrote:
>
> I have a TO220 transistor marked "69-526" it has a Motorola
> stamp. I have searched the web to the to the place where it
> says "YOU HAVE REACHED THE END GOBACK - NOW!"
> and can find no reference or cross for this part.
> The transistor is in the drive circuit for a 12VDC to 115VAC
> inverter from TRIPP LITE model PV1000FC about 10 years
> old. They were no help at all! They thought it might cross
> to a SJE2909 which does not come up anywhere???
>
> HELP!


Hi Ed, "secret repairman tip" following, ha ha! ;o)
When in doubt, just replace it with your best TO-220
pack device, always works. Well, 99% of cases anyway.
I have often been called upon to replace power
tranny's when the type was not known, including many
that were so fried the bulk of the part could not be
found, no plastic etc, just one or two melted legs
hanging out the board!

My favorite for TO-220 "guessing" is the 2SC-2335
which at 500v 7A 40w (and quite fast) got put in
many of our jobs, even when we knew the correct
tranny the 2335 was $1 compared to often $3 for
the "correct" part which had a much lower spec.

If the inverter has one main power tranny you can
bet it is NPN, even some with bridge type power
stages they usually use 2x NPN as they are cheaper,
more common, better specs etc. Same pin connections,
(repairers love TO-220 packs!) just stick one in
and see how it goes. Unless you re about to tell us
that this inverter is 500w and there is only one power
tranny or something! :o)
-Roman

PS. If the tranny is shorted replace the driver
optocoupler if there is one, and you may need to
replace the small driver trannys in the base circuit.

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