[Icom] 756PROII hum on external audio

Wed, 28 May 2003 22:41:56 -0400

Terry, sounds like you have AC ripple on the DC Pwr Supply of the
controller.  This would mean you have a bad cap in that pwr supply.  You can
bridge another across the existing one and see if it helps.   f so replace
it!  If  you can get  a meter  or scope  you can check the AC component
riding on the DC which should be small.   On the other hand if you move the
box away from everything else and don't get the hum then I am all wet.  I
remember my Ham IV box had this problem years ago and replacing the PS cap
took care of it.  Good luck!  Jacqui

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of TLW
Sent: Tuesday, May 27, 2003 9:53 PM
To: [email protected]
Subject: [Icom] 756PROII hum on external audio

I'm having hum on the external spkr jack when I pull the brake on the
antenna rotor; the control box is about 4" above the rig. Has anyone
else seen such a problem or know how to fix it? The internal spkr and
headphones to front jack are clean: the external spkr or headphones to
jack on ext. spkr have humm w/brake pulled.
Terry Wells

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