[ICOM] Problem with my 765

[Bert]

Hi Rick,

Thanks for your reply. Yes, I should have checked the ICOM site first. This
sounds exactly like what happened with my 765.

I'll remember to check here next time anything happens before I send out
emergency messages on the reflector.

However, the temporary remedy in this case (see my reply to Mike) was to
turn the AF control back and forth a couple of times. Don't ask me why, it
just came alive!!

Again, thanks to all who responded.

73 Bert, VE3OBU

 

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Rick Robinson
Sent: Tuesday, September 20, 2005 7:37 PM
To: ICOM Reflector
Subject: Re: [ICOM] Problem with my 765

Does this  sound familiar? Please bookmark this page and study it when you
have time. It is a valuable resource for 765 owners.

http://www.icomamerica.com/support/troubleshooting/ic-765.asp


Your symptom is listed here first with the previous listed problem
underneath it.



*Symptom:* 	No RX/TX when unit is first turned on, but will return if 
VFO knob is spun or if power is cycled on and off a few times.
*Probable Cause:* 	LPL problem, probably C226 trimmer capacitor has 
drifted out of adjustment. See cure for previous listed problem.




	Dead spots in the bottom 250 kHz (or so) range of each band when
radio 
is cold. Dead spots may eventually get smaller then disappear as radio 
warms up.
*Probable Cause:* 	DDS LPL trimmer capacitor C226 on PLL unit has 
drifted out of adjustment.
*Cure:* 	Readjust C226 trimmer capacitor to specs. If C226 is
difficult 
to adjust or won't hold its adjustment, it has probably become unstable 
and should be replaced. When replacing C226 trimmer capacitor, inspect 
solder in LPL VCO section and remove excessive wax from around 
replacement capacitor to prevent contamination of the new part.
*Remarks:* 	On older units, there is no address hole in the LPL shield 
cover to facilitate adjustment of C226 trimmer capacitor. On these 
units, you will have to unsolder and remove the shield cover to make 
adjustments. While you have the cover off, you may wish to drill a small 
access hole in the cover to allow easier (and more accurate) adjustment 
of C226 trimmer capacitor.



Bert wrote:

>Last night when switching on my 765 I got a real surprise. I have never
seen
>this before and I'll try to explain what happened.
>
>When pushing the "power on" button everything lights up as ususual but
there
>is no audio. Absolutely dead silence and the meter is pegged in the most
>right position. No output. No smell of  anything warm or burnt.
>
>It seems that most functions are OK - I can switch bands, display is OK,
>etc.
>
>I know it's not much to go on but ideas and tips would be much appreciated.
>Thanks.
>
>73 Bert, VE3OBU
>
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>
>  
>
----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/