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 Yaesu FT-707S 
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Post Yaesu FT-707S
Hi all I have a Yaesu FT-707S 10W hf set that has no output power. Would anyone know
what the main power transistor and drive transistors it has. I can not find a service manual anywhere on the net for it.

If someone had a pdf of the service manual or a link where I could down load it from please let me know.
Mark 2w0jmk

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MARK 2W0JMK
LOC:- IO71PV WEST WALES

NO FT8 IN MY SHACK.

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Thu Apr 07, 2022 11:20 pm
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 Yaesu FT-707S 
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Post Re: Yaesu FT-707S
I have a funny feeling that the FT707 PA is the same as FT77 PA, but I could be wrong.

Bottom of this page.

https://pa0fri.home.xs4all.nl/Mods/FT77 ... modeng.htm

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Fri Apr 08, 2022 10:42 am
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 Yaesu FT-707S 
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Post Re: Yaesu FT-707S
Great thank you so much.

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MARK 2W0JMK
LOC:- IO71PV WEST WALES

NO FT8 IN MY SHACK.

__________________
.........._______
.....___/|__|__|\____
.=.( _---\__|___|_---_)
.........O..2W0JMK..O....


Fri Apr 08, 2022 1:08 pm
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 Yaesu FT-707S 
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Post Re: Yaesu FT-707S
FT-707 manual here:https://www.manualslib.com/manual/888223/Yaesu-Ft-707.html.The transmitter output is being generated by 2 multiple protected bipolar 2SC2290 and 2SC 2395 transistors.

Gerry G4NYC.


Fri Apr 08, 2022 1:17 pm
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 Yaesu FT-707S 
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Post Re: Yaesu FT-707S
Apologies if I'm trying to teach a granny to suck eggs but if the radio is new to you check that the link on the two 'spare' connectors on the power cable plug is there. I've heard of PA problems that were just down to that

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Fri Apr 08, 2022 1:44 pm
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 Yaesu FT-707S 
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Post Re: Yaesu FT-707S
GM0ONX thank you so much for the info. It worked the set was given to me and the old owner said it had not been used
for about 6 years and he had fitted a new cable to the power plug before putting it by.

So the wire link onto the two unused pins did the trick and now had a qso with S57DX on 20m.

Thank you once more. Mark 2w0jmk

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MARK 2W0JMK
LOC:- IO71PV WEST WALES

NO FT8 IN MY SHACK.

__________________
.........._______
.....___/|__|__|\____
.=.( _---\__|___|_---_)
.........O..2W0JMK..O....


Fri Apr 08, 2022 5:52 pm
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