[Icom] IC751A Logic Unit

Tue, 2 Apr 2002 06:37:03 -0500

I too have a 751 (not A), Since you replaced the RAM battery 1 1/2 years
ago it is unlikely that the RAM has failed. It is possible - of course.

Your symptoms sound more like the problem of dried out tantalum capacitors
in the display unit and perhaps other places. I replaced mine some time
ago.

Go to the ICOM web site and download the information there on the
IC-751/751A. The instructions are there.

If you have a problem getting them downloaded let me know and I'll try to
help.

Good Luck - it is not too difficult and you can usually just bridge the
bad ones without removing - unless they are shorted.

Ed    WC4TT

----- Original Message -----
From: "Tomczak, Lech" <[email protected]>
To: <[email protected]>
Sent: Tuesday, April 02, 2002 3:59 AM
Subject: [Icom] IC751A Logic Unit

> I have a problem with the logic (and or display) unit of IC751A.
>
> My display suddendly started to show 77 in the leftmost position
(actually 7
> appeard in the
> position of a blank!) Some of the digits of display were also wrong.
>
> After reconnecting the cables between logic and display unit, it become
even
> worse,
> and now all frequencies start with EE! And now the radio seems to be
dead,
> except for frequencies 0.100-0.900MHz. Also CW and RTTY does not (do not
> dipslay), but Narrow CW and Narrow RTTY is OK.
>
> It is maybe a bad connection somewhere, since the problem disappeared
for
> a while later, and then came back. But how can I track it? Or, maybe
this is
> the
> problem with RAM. I have shifted the battery 1 1/2 years ago, so it
should
> be OK.
>
> It is not possible to repair this radio in Norway, so please help.
> I do not want to dump it yet. I love this radio!
>
> 73 de Lech, LA7MFA (ex. KK6HC)
>
>
>
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