[ICOM] 756PRO - let some smoke out

[Adam Farson]

Hi Don,

Kelly just sent me a photo. The burnt area on the CTRL board looks very much
like Q25 (the RX mute switch) and its surrounding circuitry. 

The RX antenna jack (RX-ANT) is connected to the RF board. There is a fuse
bulb in series with the RX-ANT line, which blows if excess RF power is
applied to RX-ANT.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Don Moman VE6JY
Sent: 03 January 2007 18:10
To: 'ICOM Reflector'
Subject: RE: [ICOM] 756PRO - let some smoke out

I think it's more likely R58  (2P-50-W1L301) that has melted, it's some kind
of protective device.  A friend has a similar issue with his PRO  -
R156 is burnt.  Hasn't done more than a visual inspection yet.  All in the
same area and fed from the RF-RX jack.  Maybe got RF back into the RX
antenna jack?? 

73 Don
VE6JY



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