fluke 343a -15V power failure for help

[daisizhou]

A fluke 343a is being repaired and found that the -15V power supply has disappeared
Found that Q21-SM 4144 transistor is damaged.This is a transistor made by Motorola.Can't buy now

I want to know what should I do? Is there a replacement model

Thanks for help. thanks
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[wn1fju]

The -15V is an auxiliary supply whose components do not seem terribly crucial.  The reference for the 343a, fortunately for you, is in the +15V supply.  I would think you could get by with just about any medium power general purpose PNP transistor for Q21.  Something like 50V C-E, a couple of hundred mA current and a 1 watt power dissipation.

[daisizhou]

Thanks for the successful repair