For $3 at Goodwill,I got a Sanyo Radio/CD/Tape/2 speakers that
didn't work.Made in April.1955.It was a duplicate of one that I was
using and I might get some usable spare parts.
 
When I plugged it in,nothing happened.
  On opening it up,I saw a gray layer over part of the MB near
the 110 V.A.C. plug that looked like something vaporized.
My experience had been in tube circuit repair and I trying to learn
about what the new parts are.
  The 110 V. power socket ( symbol CN ) was unusual with 2 pins for 
the A.C. and 3 pins up to the MB (motherboard) where the center pin 
was partially  missing.It looked like that this pin had vaporized.
 
  The socket looked like the following:
 
               -------------
                           I
     110V.A.C. -----       I
                           I-----I
               ----              I \ 1    Pin 2 Partially missing 
                                 I \ 2
               ------------------I \ 3
        -------------------------------------------                          
                                 MB
 
Checking with an ohmmeter,there's no connection between the A.C.
and the 3 pins.The 3 pins terminate on the MB .What is this?
 
I started checking voltages.The 110 VAC goes to a transformer and 
steps down to 12.1 VAC. with a fuse in one leg,(still good) and 
goes to a circuit of 4 diodes and 4 Caps.Checking the diodes with 
the ohmeter,I get values from 1.0  to 2.2 megs,and nothing with 
the leads reversed.The Diodes are "D", the caps are "C" ,
resistors are "R" as expected.I see that "L" are
coils,"CN" are 
jacks.
 
I noticed that there are wires running between tie points in the
MB with the symbol of "J".What are these? I thought the printed
circuit took care of connections.
 
One side of the 12 VAC is also the B+ leg.?
 
 The radio has a connection for batteries (8 D cells= 12 volts).
I figured that if the power supply was bad,it could run on 
batteriesonly and would verify the internal circuits.
When I connected the 12 V.D.C.,I started to see smoke and quickly
diseconnected.I felt around for hot spots and found one hot area
in the middle of the MB.
 
I saw a L shaped metal separator,about 3 " long leg,3/4 " short 
leg,about 5/8 " deep that was hot.Attached to it ,by a screw,was 
a black piece,of several layers about 1 3/4 " by 3/4 " ,with the 
symbolsToshiba TA 822?K with 14 pins going to the MB.
On the other side of the metal separator,I see a 25 V, 2200 MFD 
cap.
 
What does the symbol TA mean and is there any table of 
descriptions on the Web? A look at the DIGIKEY catalog wasn't 
helpful.
 
If the B+ and one side of the 12 VAC are in the same leg,what 
kindof a rectifier circuit is that with 4 diodes and caps?
 
I also see another strange piece;
 
            bolt hole
             v
           --  ------------I metal support
           --  ------------I
                I          I \    The black item labeled "Q" was   
                I          I \    was held up by the 3 wires to the 
                -----------I \    MB.
            -----------------------------MB
 
Right now,my first inclination would be to replace the 25V,2200 MFD 
cap and repair the vaporized wire in the connector and see what 
happens.I still can't figure out where the current came from to 
vaporize the metal in the center wire.
If nothing else,I could still use the parts as spares for the 
good unit that I have.
 
 
 

--- Maximus 2.02