"Kerry Miller" wrote in message
news:84YDf.148864$WH.136453@dukeread01...
Since I'm going to have to order a chip for that Astron PS I was working
on, I dug out another old PS that died a few years back. If I have to pay
shipping, I might as well order enough parts to at least make up for the
shipping costs...

Does any of you guys know where to find a schematic for a Yaesu FP-757HD
power supply? It has a 3-terminal regulator in it, it looks like a 317,
but it has funky markings on it which say B824, then down and to the right
it says Q5D. It might be an O or 0 (zero) 5D. Do you guys know if you
can replace this B824 thing with an LM317? The transistors are oddballs
too but I haven't gotten the number for them. If I have to, I can just
start from scratch on it, there's not much to it and there were a couple
of caps with the legs corroded off. I can probably just come up with my
own regulator as easy as I can fix this one unless I can find a schematic.

Do you guys know where to find a schematic for this thing?

Tnx,
Kerry, WD5ABC

Here we go:

3 - Pass (NPN) transistors Q1 - Q3: 2SD717-Y
on heat sink

These 3 should be on PC board (AVR Unit PB-2156
Q101 - 2SK192-BL (looks like FET)
Q102 - 2SA1012Y (looks like PNP bipolar)
Q103 - 2SA950Y (looks like PNP bipolar)

Q102 drives the pass transistors
Q103 Base connected to VR101 for adjustment (voltage adjust?)

w9gb