[Yaesu] Yaesu FT-620B

[KBØNLY]

This is my first time posting so I hope it works!!

I have a FT-620B that has a curious problem, when I bought it half a year ago all the modes worked.  AM,CW,USB,LSB, this rig does not have FM.  Now the other day I decided to once again try it on CW but neither CW or AM seem to work any more.  On CW with key down I hear the relay click to transmit and I hear the sidetone but the meter isn't showing any power out on the radio, I also don't see any power out on a wattmeter.  However you can hear the relay click over to transmit and the receiver quiets.  On AM for this radio you are supposed to set the AM CARRIER control to the desired power out by the meter, I also no longer see any power out by the radios meter or by the wattmeter.  On USB and LSB however the radio works beautifully and I use it nearly everyday to chat with the locals.

I suspected the relay at first, but since it was working on CW about 5-6 months ago and so was the AM and now suddenly it doesn't leads me to believe that something went dead in the radio.  Is the AM and CW closely related in this radio that they would both be affected if one component gave up?  On AM when you push the PTT on the mic you can hear the relay click, but you can also hear a loud pop from the speaker when doing so.  On CW you hear the relay click on and hear the sidetone while sending then of course you hear the relay click off.

I can't find any mention of Yaesu ever publishing a service/maintenance manual for this radio, seems odd to me since the 101B I used to have had one, and the FT-221 that I recently resurrected from the dead had one that was easy to obtain.

So, does anyone have any suggestions?  Is there any other FT-620B owners out there or someone who knows what's wrong?  Is there indeed a service manual for this radio, that would be of significant help also.  You can email me at:

kb0nly@arrl.net

And check out my Web Page!  www.qsl.net/kb0nly

Thanks in Advance and 73,

Scott,  KBØNLY





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