IFR COM-120B Real Time Clock Failure

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JRayfield
Posts: 44
Joined: Tue Jan 20, 2009 9:33 pm

IFR COM-120B Real Time Clock Failure

Post by JRayfield »

I've got a COM-120B in which the battery in the Real Time Clock (RTC) apparently went dead.

I replaced the RTC module (got several from China) but the Self Test still shows the RTC failure.

Of course, it's possible that the RTC modules that I from China are defective.

Or it's possible that I damaged the circuit board while getting the old RTC module out (the board looks ok, though, and I installed a low profile socket, so I didn't have to solder the new RTC module back in).

Has anyone replaced the RTC module in a COM-120B and had the monitor to continue to show an RTC failure?

Any suggestions?

John Rayfield, Jr.
Rayfield Communications
Springfield, MO
www.rayfield.net
jry
Posts: 448
Joined: Fri Feb 06, 2004 3:14 pm

Re: IFR COM-120B Real Time Clock Failure

Post by jry »

it has to be programmed
JRayfield
Posts: 44
Joined: Tue Jan 20, 2009 9:33 pm

Re: IFR COM-120B Real Time Clock Failure

Post by JRayfield »

Can someone tell me how this is programmed?

John
Rayfield Communications
Springfield, MO
www.rayfield.net
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AdrianH
Posts: 35
Joined: Fri Mar 16, 2018 12:03 pm
What radios do you own?: Yaesu FT-857, FT-902DM, FT70

Re: IFR COM-120B Real Time Clock Failure

Post by AdrianH »

Hello John

Can you tell me if you have anything to program the device with, out side of the IFR as a few bits need to be set. It may be possible to 'poke' some settings into the RTC in the IFR using serial but I have not discovered how to yet.

Adrian
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