[Icom] IC-735 Problem

Wed, 3 Jul 2002 00:34:59 -0000

I had a similar problem on my IC-765.  The problem was in the DC to DC
converter on the display board.  The solder on the pins in the module were
cracked making an intermittent connection and allowing the 5 VDC rail to
wander.  And this 5 VDC supplies the Voltage Controlled Oscillators for the
phase locked loops.  Don't know if the 735 has a similar module but if it
does...

The problem is/was that the holes for the pins on the module and the holes
for the pins on the display board may or may not be precisely aligned so
when you install the module on the display board you may have to bend the
pins for a fit.  And in a few years you have a cracked solder connection.

de Paul, W8AEF

----- Original Message -----
From: "Davies, Doug A FOR:EX" <[email protected]>
To: "'Icom'" <[email protected]>
Sent: Tuesday, July 02, 2002 4:36 PM
Subject: [Icom] IC-735 Problem

> The receive frequency in my 735 has drifted off about 2KHz compared to the
> transmit frequency.  Thinking it may be an alignment problem, I contacted
> Icom Canada to get instructions on how to fix it.  They told me it's
> probably not alignment but 4 plastic trimmer caps that have "dried out".
> They said the fix is to replace these caps with ceramic ones.  The guy
> couldn't give me part numbers so I have no idea where to look.  Has anyone
> ever heard of this as a fix for the rx drift?  If so, where do I find the
> offending parts?  Thanks for any and all replies.
>
> Doug  VA7DD
>
>
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