[ICOM] IC 725 Intermittant Transmit Failure

[Bruce]

Thats what we call the LPL loop.

At 03:11 PM 10/19/2006, you wrote:
>Lee, Bruce,
>
>Another possibility is that the LPL (DDS) is on the edge of unlocking. Try
>aligning the DDS as described in the service manual.
>
>You can download the service manual here:
>
>http://www.marcucci.it/english/download/index.htm
>
>Cheers for now, 73,
>Adam VA7OJ/AB4OJ
>
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
>Behalf Of Bruce
>Sent: 19 October 2006 09:24
>To: ICOM Reflector
>Subject: Re: [ICOM] IC 725 Intermittant Transmit Failure
>
>Lee,
>When you go to Tx does the light on the front panel turn red?
>If it doesn't you probably have a PLL unlock condition due to bad trimmer
>cap or cracked solder around the LPL loop circuit. To confirm LPL loop try
>going to 7.000 MHz freq and try and Tx then move up to say 7.150 MHz, do you
>get Tx then?
>Very hard to troubleshoot this way..
>Bruce
>At 07:43 AM 10/19/2006, you wrote:
> >I have an IC 725 that intermittently (at an increasing frequency) locks
> >up and will not transmit rf when the PTT on different microphones is
> >pressed.  Relays click and the receiver switches, but no rf appears at
> >the output.  This condition can be eliminated temporarily by cycling
> >the radio off and then on again.
> >
> >The radio has had little or no use in the past ten years until
> >recently.  The symptoms maintain despite changing antenna systems,
> >microphones, and even power supply cables.  Nothing regains operation
> >(switching bands, randomly punching every front panel control, etc.)
> >except cycling the power switch off and then on.
> >
> >Any one know what the cause might be?
> >
> >73 de Lee
> >KM4YY/8
> >
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