[ICOM] IC-751A has screwy 17 mtr band

[Gary Fiber]

This happen on any other band?
Almost sounds like its not open on the 17 meter band though it should 
tune RX wise through it. My guess is going to be a logic issue if all 
other bands tune ok. Could be a corrupt ram unit or cracker solder 
joints on the ram unit but I would also think other bands would be in trouble.

  There is a little 8 volt power supply circuit board under the 
bottom cover along the side where the internal power supply fits. A 
small resistor R1 likes to burn up. I think its either 2.7 or 4.7 
ohms at 1/8 watt. If the 8 volts is incorrect generally replacement 
of that resistor with a 1/4 or 1/2 watt same value fixes the trouble. 
Lots of times when the 751A and other rigs in that time frame do 
strange things its the 8 volt supply in trouble.

Take Mike's advice and drop Scott Malcom an email or Kuni Okuma. Both 
have continuing experience with Icom products. Mine is getting long 
in the tooth these days.

Gary K8IZ

At 02:02 PM 12/6/2009, you wrote:
>I just picked this real nice looking 751A up at a swap and it works 
>just fine EXCEPT 17mtrs.  I suspect a trimmer cap but 15 mtrs is 
>fine and so are all the other bands.  When you try to use 17, the 
>display always goes to around 18.047.  Then when you turn the VFO 
>knob it jumps way up to 18.650 all at once and stays there. At that 
>point one of the segments on the numeral 6 goes out.  That happens 
>at no other time.  If you turn it back the other way it jumps down 
>to 17.9xx and stays there.  It will not transmit on 17 at all.  I 
>don't know of any mods that were done and the rig works fine 
>everywhere else.  Any ideas would be appreciated.  73  Tom
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident