[ICOM] got the ptt fixed

[Fern]

Hi Ron:  Thanks for your reply. This radio has already had the cursed pll vco caps replaced already by a previous owner. I wasn't going to bed till I found the problem. One of the grounds at the mic connector was the culprit (it was broken off so it was intermittent) plus the manual xmit switch uses the same ground (which is what kind of threw me off for a bit). I did make one contact on 75 meters (at 2:00 am) when I finally put the 761 on the air and got good reports. I like the speed of the automatic antenna tuner. I just made some contacts this morning with some of the guys that I know (again on 75 meters) and the transmit audio is great. Initially, when using the processor, I was told that the audio was on the rough side but I see that one has to back off on the mic gain when the processor is switched on. I don't have to do that when using the old icom 745. I'll go back into the alignment of the 761 ( I did get a copy of the service manual with it) and see if I missed an adjustment to fix that problem. That radio will put out an easy 150 watts out if it's cranked up but best to leave at around the 100/110 watts level. It's a bit of a job to get at the second oscillator adjustment as it's buried underneath the switching power supply so one has to temporarily get the ps out to get a the reference trimmer as it was off enough to want to correct it. The hm-36 hand mic that came with it doesn't work as the previous owner's pussy cat had chewed up the cord but I may just have a replacement cord around. I've used an hm-12 which work ok but tried an hm-23(similar to hm-12 but has dtmf pad on the back of it) and it's an even better mic as the frequency response accentuates the high's a bit more.
    So all I have to worry about is why did the frequency disply show 77E instead of the frequency (hopefully it's just a bad connection somewhere's and not in the pll or vco circuitry).
    Where is this "knowledge base" site that you're referring to? I google for the 761 problems last night but didn't get anything.
     73 from Fen  VE7GZ


----- Original Message ----- 
From: <bonddaleena at aol.com>
To: <icom at mailman.qth.net>
Sent: Saturday, January 09, 2010 6:32 AM
Subject: Re: [ICOM] no ptt transmit on IC-761


> Hi Fern. Did you look on Icon's "knowledge base"? I bought a 761 years 
> ago, during a move. It had (has) a great receiver, but the transmit was 
> dead. I feared it was the finals, but a trip to Scott at MTS confirmed 
> it was the dreaded 'crummy trimmer syndrome". He replaced them all and 
> aligned it for a better than reasonable price and other than a dirty 
> T/R relay (easy fix), it has been perfect.
> I sure wish I had a buck for every problem those $%^&* caps have 
> caused!!
> 
> ron
> N4UE
> 
> 
> -----Original Message-----
> From: Fern <crc at cyberlink.bc.ca>
> To: ICOM Reflector <icom at mailman.qth.net>
> Sent: Sat, Jan 9, 2010 1:58 am
> Subject: [ICOM] no ptt transmit on IC-761
> 
> 
> I just acquired an Icom IC-761 today. At times, the radio will not 
> transmit with
> ptt (it's definitely not the microphone as I've tried 3 different mics) 
> but at
> times it will work using the VOX option. Also, the manual xmit key will 
> not
> key up the transmitter. I have done the cpu reset with no improvement. 
> It lost
> the frequency display at one point and then came up with 77E shown in 
> lieu of
> the frequency. Shutting the radio off and then back on will restore the
> frequency display but still no manual ptt for xmit. Has anyone seen 
> this
> problem? Any help with this would be greatly appreciated. 73 from Fern
> ----
> 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/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
> ----
> 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/
> To support QSL/QTH.net: http://www.qsl.net/donate.html


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