japanese transistors are usually marked without the two first markings...
For instance a 2sb824 will be marked as b824.
Fets are marked as 2sk or 3sk.
Diodes as 1s..., it is like the american notation 1n, diode, 2n transistor
etc....

"John Ferrell" schreef in bericht
...
When dealing with Yaesu (Vertex) it is worth the effort to contact
Vertex for special parts. There is a special regulator in the power
supply for the FT-301 that is no longer available. Contacting Vertex
led to a replacement subassembly for about $6. Not bad support for a
25 year old piece of equipment.



On Tue, 31 Jan 2006 23:56:11 -0600, Kerry Miller
wrote:

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
John Ferrell W8CCW