[70cm] FT-736R Power supply

[Richard Seal]

  Replace the electrolytic capacitors near the two large resistors in 
the power supply. It's 3 or 4
caps. Its been so long since I did mine I have forgotten .You will see 
them near the resistors and
its the heat from those resistors that have dried them out. I would 
sugest you replace them as soon
as possible before the power supply is permanently damaged . Some will 
pop like a firecracker
and blow the AC fuse. That is terminal many times. Not all parts are 
identifyable, as whoever
built the power supply for Yaesu used their proprietory system to 
identify them. I have repaired
several for friends so its easy.
 "IF" I remember correctly you need a 470 mfd, 220 mfd, 56 mfd, and a 1 
mfd. . Pay attention
to the working voltage marked on them and if size permits go a little 
larger. Try to bend the
leads on the two large power resistors and move them as far away from 
other components and
above the circuit board as possible.
 I do have a schematic (poor one from Yaesu) and a partial parts list. I 
can send copies to you
if necessary.  Good Luck

Richard Seal / K4RTS


Michael Urich wrote:

>I have developed a problem with my FT-736 that I suspect is a power
>supply problem.
>
>First
>Sometimes when I go to turn the rig on nothing happens but if I leave
>the switch depressed and unplug the internal power supply and plug it
>back it it comes on.
>
>Second
>Again sometimes, if I turn the transmit power up it will transmit just
>fine but when I unkey the mic the radio goes off for about 1-2 seconds
>and then comes back on.
>
>Has anyone else experienced or know of similar occurances?
>
>Tnx
>
>  
>