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IFR FM/AM 1200 memory problem

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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crash
Posts: 25
Joined: Sun Oct 19, 2014 11:21 am
What radios do you own?: R2001C

IFR FM/AM 1200 memory problem

Postby crash » Sun Feb 01, 2015 1:30 pm

Hi All!
Recently, my 1200 has started to show a CRC error and it clears the stored info in the memory before starting.
My question is, is it the backup battery, or the memory? Any Ideas, anyone?
It sure was a pain loosing the stored setups, now, I have to do everything manually!
Jeff
Jeff 'crash' Young N8CMQ

bh7juo
New User
Posts: 32
Joined: Mon Sep 15, 2014 3:04 am

Re: IFR FM/AM 1200 memory problem

Postby bh7juo » Sun Feb 01, 2015 9:40 pm

If battery has rated voltage,maybe it's memory fault.But most of time I found old machine lost their battery votage.
BH7JUO Mark
HF DX,test set repair,PCB design,MCU coding,DIY......still have not enough time

jry
Posts: 320
Joined: Fri Feb 06, 2004 3:14 pm

Re: IFR FM/AM 1200 memory problem

Postby jry » Mon Feb 02, 2015 4:37 am

battery dead .... just about all of the 1200 series are over 20 years old now.

You can measure from the side of the card cage without pulling the uP card but chances are it needs to be replaced anyway

crash
Posts: 25
Joined: Sun Oct 19, 2014 11:21 am
What radios do you own?: R2001C

Re: IFR FM/AM 1200 memory problem

Postby crash » Fri Feb 13, 2015 12:18 am

The battery is dead.
Thanks!
Jeff 'crash' Young N8CMQ

crash
Posts: 25
Joined: Sun Oct 19, 2014 11:21 am
What radios do you own?: R2001C

Re: IFR FM/AM 1200 memory problem

Postby crash » Sat Feb 14, 2015 5:04 pm

Hi All!

It was the coin battery.
The new battery took care of the crc error, and I reprogrammed my most used frequencies and tones.

I am also replacing the lead acid batteries, so it can be portable once again.

Thanks again!
Jeff 'crash' Young N8CMQ

wcripley
New User
Posts: 1
Joined: Wed Oct 04, 2017 1:51 pm

Re: IFR FM/AM 1200 memory problem

Postby wcripley » Sat Oct 07, 2017 11:01 am

Just in case someone else runs into this problem, I have an IFR FM/AM-1200 that had the same problem.

I bought 3x (1 to use, 2 spares) from a major USA electronic parts distributor. I guess I should have checked all the batteries that I bought from them. I picked one of the 3 out of the box, tested it to make sure it was the right voltage, and it was. I put it back in the box, then the next day de-soldered the old coin-cell and replaced it with one of the 3 new ones, and (because I am stupid) assumed that all were good. It turns out that 2 out of the 3 were bad from the supplier. I swapped out the battery, tested it this time, and now the unit is much better behaved and seems to work correctly. I chased my tail for a week or two thinking I had a bad EPROM since I still saw the check-sum error. Now all is good.

Moral of the story is to check these old solder-in Coin Cells. They may have been sitting on a shelf for decades.


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