On Sat, 29 Jan 2005 16:06:57 -0500, larry wrote:

Greetings

Our local amateur radio club is trying to get onto irlp. And we have been
running into our share of problems... Two of them have been radio
oriented...

The first radio they tried was an 227... the second radio they tried was
an icom22s...

I have the icom 22s now on the bench... I was given a schematic, which upon
openning up the radio, about a hour ago, found that the schematic is for a
22 and we (I) have a 22s...

The audio output chips have different pins quantities...

The problem appears that there some wires, coming from the rear panel that,
I believe, should go to the circuit board but end of in mid air... not
connected... hence no sound...

Now what I believe is the audio output chip has the follow markings on it...
nec e72e ... and ... 575c2... does anyone recognise this chip... I need to
know what the pin out is... in particular what the audio output pin is.
from knowing that pin I should be able to trace it out and see where the
wire goes that goes to the speaker... make any sence?...

After that I may have more question...

If anyone knows where I can get, on the internet, the schematic of the
icom22s that would be appreciated...

Larry ve3fxq

Larry.

Go to Google and type: IC-22S manual

Near the bottom of the page you will see the following:

Manyals Download
.... 1,788KB) » IC-20 (4,441KB) » IC-22A (7,299KB) » IC-22S (4,357KB ...
Requesting an Instruction
Manual: If you cannot find the intended instruction manual you ...
www.icom.co.jp/world/support/download/menu.html - 80k - Cached - Similar
pages

It,s the right one,I am downloading it now..
73 Magazine had an extensive series of articles on modifications to
increase the amount of channels available.
Also a mod to get the thing going on the 145 Mhz packet frequencies.
Ask if you want to know more. But first look at ALL the Google hits to see
if there is more info available there.
73 de Eskay.