[Yaesu] FT290R PTT Fault

Sun, 17 Nov 2002 09:08:54 -0600

If the rcv mutes and the xmit relay or switch is on, (does the XMIT
light come on?) sounds like either =

1) VCO is unlocking
2) xtal in hetrodyne unit is going bad or not starting
3) bad relay contact in DC or RF switching
4) possibly leaky diode or xstr in a xmit ckt not conducting properly.

Rule #1....CHECK YOUR VOLTAGES! always! Not just the 12v external but
your INTERNAL xmt voltages...make sure there is 8V or whatever it
is getting to the xmit ckts...get a copy of the svc manual if you
dont have a schematic with the voltages on it...but it should be
an easy fix...

I had a FT227R 2mtr rig that had a similar problem...turned out the
8V xmit regulator had a cold solder joint on it.....had to remove
one of the PCBs to get to it but the rig worked fine after that
(I still own it! since 1978!)_

Bazza wrote:
> =

> Hi .....Wondering if anyone can help.
> =

> My FT290R on most occasions refuses to go into TX .........
> Perhaps 2 out of 20 attempts are successful.
> Receiver is muted on all attempts  when PTT is pressed but TX mostly do=
esn't
> activate.
> =

> Transmission ( when it does work ) is OK
> Output power normal.
> =

> Microphone is OK ..............
> =

> Any thoughts ...........
> =

> Thanks
> =

> Barry
> =

> [email protected]
> =

> Moderator: Ray Brown, KB=D8STN
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