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Author Topic: IC-725 No carrier output on AM, FM, CW, but SSB ok  (Read 681 times)
W0OPW
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Posts: 44




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« on: December 03, 2009, 12:45:25 PM »

This is weird. I am resurrecting my old IC-725 that has been in the closet for about 12 years, which worked fine when I last used it.
I am going to donate it to a new ham so thought I better fire it up first. I found this problem where I cannot get any power out except on SSB. No CW, nothing at all. It will work on SSB but there is no way to tune up into a SWR bridge(unless one whistles really long). I got on the air confirmation that SSB is ok, and power out shows up on the meter too.
 I went into the user manual and got all the way into checking the internal fuse(ok), and unsoldering two components to adjust the driver and PA currents in the PA section. I may have hurt it more than helped.
 So, does anyone have any ideas what next to do?
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N5VTU
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Posts: 367




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« Reply #1 on: December 03, 2009, 01:55:40 PM »

As I recall, AM & FM operation on the IC-725 required the installation of an optional board, UI-7.  You might check to see that it is installed correctly and hasn't been dislodged (or is missing).  I am not sure why the CW mode would not be functioning.

Good Luck getting it going.
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W0OPW
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Posts: 44




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« Reply #2 on: December 04, 2009, 07:50:02 AM »

Thanks for the update. I'll continue trying.
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KE3WD
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Posts: 5689




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« Reply #3 on: December 08, 2009, 10:28:30 AM »

First thing to do is clean and lube all switches and controls using Deoxit spray or equivalent.  

While inside, unplug any connectors one at a time, spritz of Deoxit into the female side, reconnect to clean any possible corrosion from them sitting.
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