Icom ICR7100 Slight Problem
Ian Wiseman
Any tech bods out there know if it's fairly easy to re-tune an Icom
IC-R7100?
I've noticed that signals are a little off-frequency recently , not by
much but enough to be annoying when scanning around.
I used to have this problem with AOR scanners years ago (Both my
AR2002 base scanner and my AR1000 hand-held scanner used to drift off
frequency with the seasonal weather changes) and I was told by an AOR
engineer where to find a small trimmer that I could tweak to get it
back on frequency again.
My Icom has been fine for at least 6 years so it's nothing too drastic
but if there's an easy way to persuade it to go back on frequency then
brilliant!!
I've tried the set on several VHF and UHF channels that used to be OK
and still appear fine on my trusty Yupi 7200 so any help would be
appreciated.
Thanks for your help,
Brian Reay
news:gknncvgi9nh3d1u8b...@4ax.com...
> Hi there,
> Any tech bods out there know if it's fairly easy to re-tune an Icom
> IC-R7100?
>
> I've noticed that signals are a little off-frequency recently , not by
> much but enough to be annoying when scanning around.
>
You really need to get a copy of the service manual, you can get it from
here for free: http://www.marcucci.it/english/download/
The files big (28MB) and the site slow and not always up. As the manuals are
expensive it is worth being persistent.
If you have the kit and experience just run through the procedure- I've not
done a 7100 but the 7000 is similar (I believe) and that is straight
forward.
As a general rule, if you have a fixed offset error across the whole
spectrum look for a crystal that is used as to generate a mix signal
everywhere.
If it is just a fixed offset on one or more parts of the spectrum, you are
probably looking for a crystal that is used just there.
If the error varies across the spectrum in one direction (ie always
increasing as you go up or down in frequency) suspect the reference crystal
that feeds the phase detector.
Of course, you may see a mixed pattern- in which case a full run through is
required.
Without being funny, if you are not that familiar with this sort of thing I
suggest you get someone to give you a hand- this isn't the sort of receiver
to start learning on.
--
73
Brian
G8OSN
www.g8osn.org.uk
and
www.qsl.net/g8osn for FREE training material for the UK Foundation and
Intermediate Licences
John
I have owned one for some time now with the only problem being a
blown dial light but one quick fix would be to have the NB/AFC button on so
that when the radio stops on a freq it will auto tune to the centre
frequency ?