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Need Com 120A help .....

This forum exists for the purposes for discussing service monitors (This includes but is not limited to Motorola, HP, Aeroflex, GD, etc). Additional topics allowed include test procedures, interpretation of test results, where to find information about specific tests, antenna VSWR, return loss testing, duplexer and filter alignment, etc.

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Darel
New User
Posts: 8
Joined: Tue Jan 03, 2017 7:19 pm

Need Com 120A help .....

Postby Darel » Tue Jan 03, 2017 7:29 pm

Hello all ...

I was recently given a IFR Com 120A that seems to be in very nice shape but the power button up front will not turn the unit on or off ( I need to use the rear switch ). Also, after the self test it gives the message "rf term overheat, reduce rf input" although I have no rf going into it. If I hold the front power button down while I turn on the unit from the rear I can get it going and it seems to work ok but if the front power button is pressed it will freeze up.

Has anyone else had a similar problem with one ...looking for some guidance!

Thanks,

Darrell

lc4600
New User
Posts: 9
Joined: Mon Aug 03, 2009 7:29 am

Re: Need Com 120A help .....

Postby lc4600 » Mon Jan 30, 2017 6:30 pm

The metallized plastic switch has lost its ability to go low enough to toggle the on/off circuit in the power supply.
IFR just replaced the overlay to repair this.

Base Band PCBD needs washed and all the surface mount electrolyte capacitors replaced.
What am I saying- all the surface mount electrolyte capacitors replaced on all the PCBDs.
I use multilayer ceramics instead -rocks don’t leak
Carl N0PXJ


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