[ICOM] 751A Plastic Trimmer Capacitors

[Gary Nichols]

Eddy, with my 751A when I first turned  it on it was very raspy sounding on
CW but that went away after some time on.  I didn't notice any problem on
transmit.  I replaced the VCO caps in both my 735 and 751A at the same time.
Parts are available from Icom parts and not very expensive but getting the
old ones out is quite a chore...especially on the 735 and the hardest part
is getting the cover off the VCO box...both top and bottom side of the PC
board.  Some disassembly is required but if you take your time and make
notes so you can get all the cables back where they belong you can do it.
Just be very careful with your soldering...de gary, kd9sv

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of EP Swynar
Sent: Monday, November 05, 2007 12:05 PM
To: ICOM Reflector
Subject: [ICOM] 751A Plastic Trimmer Capacitors

Good Morning All,

Can anyone who has ever had to replace the VCO plastic trimmers in their
751A, please tell me just how, exactly, the problem manifests itself in
terms of transceiver operation...?

Does it affect transmitting only...? Receiving only...? Both...?

Also, is the issue limited to a specific band, or is all of the range
normally covered by the transceiver affected...?

I'm beginning to wonder if the issue here with mine of "no transmit" might
be directly related to these capacitors, which I understand are notorious
for expiring after awhile (my 751A was purchased new some 18 years ago, or
so --- it resides in the basement).

Lastly, is there a definative web site that specifically addresses just this
one problem with these transceivers...?

Many thanks in advance, & my vy

~73~ Eddy VE3CUI - VE3XZ
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