Has the wiring in the microphone been checked? Maybe it's simply a
broken PTT line inside the mic or at the connector end...

Scott



MerLin wrote:

Hello Greg,

Thanks for your reply. I have just downloaded the user and service
manual for the TS-780..i will give it a look later on. However as for
T/R switch...i don't think it is being activated on trasmit as i don't
hear any replay operation. So it seems that part of the control
circuit is not functioning. I still have to look at the schematics
though.

Thanks for you help

Mario

gb wrote:

"MerLin" wrote in message
groups.com...

Hello all,

I just got a Trio TS-780, however there is no RF power on Transmit. At
first i thought that PA stage was damaged however i also noticed that
the ON AIR Led and Antenna Switch are not energised in Transmit Mode.
Receiver is working perfrectly. Can anyone supply me with detailed
schematics for this Transciever and whether anyone has seen this fault
on similar transceivers?

Thanks

Mario


Mario -

Always have a 50 ohm dummy load attached for testing.

Check the T/R (Transmit/Receive) relay in the RF section of the radio.
Is it working?

Kenwood/Trio TS-870 Repair Notes (check for shorted capacitor)
http://www.mods.dk/view.php?ArticleId=3094

Kenwood/Trio TS-780 Owner and Service manuals are he
http://www.mods.dk/view.php?ListManuals=kenwood

Greg
w9gb