I'll try again. Have a Com120b with some keyboard issues.
Has anyone been able to repair these? So far just a couple of keys Like power.

I heard the circuit works 2 part solution flakes off and may cause shorts.

Anyone?

Anyone have replacement keypads for the 120b?

I have a couple of buttons working very poorly.
I think these are the carbon impregnated type.

I have heard some have fixed with the circuit works 2 part brush on.
Some say it does not last long, flakes and shorts out.

Anyone have a fix?

TIA

Found the problem today with the COM120B, was getting rec level error, distortion meter error. Swapped the baseband and the receive boards. Replaced the rtc Dallas IC. Still had the problem. Tried a cal, same problem. Then checked the functions to find the generator output was 30db low. I thought it...

That problem went away after I replaced the dallas ic.

Anyone have a source for the 120b extender cards?

Yes, ok Carl, That's what I have discovered, the 14v is applied when hot.

Trouble is no fresh 1286 ICs around.
They have not made them for years.
The ones with recent code dates are possible counterfeit..

I found normally only one fan runs. When it gets hot the 2nd fan runs, noticeable sound difference.

I had the same problem last year. Moto sent me new firmware for the power supply.
They also had me beta test new firmware for months before release.
Make sure you have the latest firmware.

I have 3 8000 units that work correctly now.

So I have noted there are 2 cooling fans in the 120b/c series. Some thermal sensor triggers the 2nd fan as needed. My 120c second fan came on and the room was not that warm. The fan continued to run after I shut down the ifr. I am experimenting by using an external 12v supply. According to the temp ...

I have Com120b with Distortion meter and RX level errors.
Does this sound like caps on the baseband unit?
What else has caused these failures.

I was lucky tonight. I removed the Dallas IC, Installed socket. Did not lose the memory.
When my new Ic's come I will read the chip and try the newly programmed DS1284.

Learned a lot here. Hope it works, I have 4 of my own to do and 4 for my friend.

I have 4 COm120b units. When running hyper terminal connected to Com120B serial port some units display boot messages.
Other IFR units Don't Same comm settings on all.

Anyone else ever seen this.

Did a cal on my 120c, after the cal run time went to 0 Anyone else ever see this? I think my RTC is about to go, since the hour and date show the last day and time it was turned off. Waiting for a programmer to capture the nvram Did the id and options but since wowbangor has not been around I am on ...

Anyone who has lost the NVRAM RTC DS1286, been able to enter their serial number?

Do you use the whole number or just the last 4 digits?

Does it work on an external 12v supply?
Also be careful you use a large conductor cable from the 12v supply. The initial current draw is like 10 amps, then settles down to about 4-5 amps.

So if you managed to pull the ic, read it, program a newer one. You say it worked for you?

When in receive, zoomed on the receive level screen there is an option to set level. Whenever I follow the prompt to put a jumper from TR to antenna, I see the calibration happening, BUT After, the receive bar graph shows full, even with no signal. Restoring to defaults from the main menu clears thi...

Continuing to work on my 120B and to figure things out. As like many others the main concern in the RTC, so a while ago I ordered a couple of RTC's from Ebay and was wondering if one would really consider these being made in 2016? Is the DS 1286 the part that is the original RTC? If so from the dat...