[Icom] Sick 761

Sat, 19 Apr 2003 11:29:11 -0600

Hi,
Band selection and mode selection is done by mux chips. Maybe chip 
control binary signal
is improper?  
73,
Tony, VE6CGX

wjdiamond wrote:

>Hi folks,
>
>It is essentially the same on all bands but as I go upwards from 20 M the
>power does increase to almost 10 watts.
>
>The test lead trick works the same.
>
>There is no CW, FM or AM at all, just RTTY and SSB. Turning the speech
>processor on will kill the SSB output.
>
>        William J. Diamond (Bill)
>        Rogers, Arkansas USA
>        [email protected]
>
>        Ham Radio Operator WR�T
>      Flying The Flag Long Before
>            It Was Popular
>
> Please Visit My Icom Radio Page At
>
> http://pages.sbcglobal.net/wjdiamond/index.html
>
>-----Original Message-----
>From: [email protected] [mailto:[email protected]]On
>Behalf Of Tony Hwang
>Sent: Saturday, April 19, 2003 2:44 AM
>To: [email protected]
>Subject: Re: [Icom] Sick 761
>
>
>Hi,
>Is the symptom same on any and all bands?
>Happy Easter,
>Tony, VE6CGX
>
>wjdiamond wrote:
>
>  
>
>>Hi Folks,
>>
>>Well, I have my new 756 PRO II for the shop now but I keep wondering about
>>the 761.  What am I missing on it?
>>
>>I spent an hour on the phone with Icom Tech support today and based on the
>>voltage readings, they said that is should be working but it is not.
>>
>>For those of you that are familiar with the 761, I am finding something
>>really strange. If I touch a metal screwdriver or test lead to either side
>>of Diode D 24,on the RF board, the radio will put out 135 watts to the
>>    
>>
>bird
>  
>
>>and dummy.
>>
>>All voltages at the diodes are within .2 volts of what the manual and Icom
>>says. When looking at the output of J8 with a scope loaded with 50 ohms,
>>the output is about .2 volts RMS. Icom says that it should be 2 V RMS.  If
>>I use the test lead it goes to 2.2 V RMS.
>>
>>I have replaced all the diodes and caps  and transistors in the Icom tech
>>info sheets and it still puts out about 4 watts.
>>
>>I am sure it is in the RF board and so is Icom. Short of replacing the RF
>>board, neither Icom or I know what else to do.
>>
>>I am sitting here looking at it now and it is just too nice to use as a
>>parts rig.
>>
>>Does anyone have any suggestions?
>>
>>Thanks
>>
>>
>>       William J. Diamond (Bill)
>>       Rogers, Arkansas USA
>>       [email protected]
>>
>>       Ham Radio Operator WR�T
>>     Flying The Flag Long Before
>>           It Was Popular
>>
>>Please Visit My Icom Radio Page At
>>
>>http://pages.sbcglobal.net/wjdiamond/index.html
>>
>>
>>----
>>Your Moderator: Dick Flanagan W6OLD, [email protected]
>>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>>
>>
>>
>>    
>>
>
>
>----
>Your Moderator: Dick Flanagan W6OLD, [email protected]
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>
>----
>Your Moderator: Dick Flanagan W6OLD, [email protected]
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>  
>

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