Hi to All, After long time waiting, I finally receive TMS370C256 controller, desolder old one from the keyboard PCB, solder new one, and /a miracle!/ see on the screen pf COM120B "Restoring the cals to the front panel". Next, trying to make calibration of Power meter, and again success! ....

I had a R2600 series that had the same problem, it turned out to be the power FETs (TO3) in the power supply module. It had loose screws and were shorting out the unit sending it into over current protection.

Thanks, it was a problem with the keypad as far as the beeping goes. It's working now but only at room temperature.

RFI

I got it working. I depressed the input buttons repeatedly and rebooted. It's now functioning well. I will dissasemble and clean the input board a later date.

RFI

Thanks, I will check it out this week. I changed the T/R port, battery on the processor board and fixed the power supply 2 month ago but it still had the boot-up problem when cold and it died during the last polar vortex. I found the screws that hold one of the power FETs loose to the point where it...

Hello, I have a R2670B that is giving me 1, 3 and 1 beeps when I power it up and there is nothing that shows on the screen. It previously had reboot symptom when I first tuned it on cold, then it would work fine after warming up. The power supply is good except for the 40 volts is out of tolerance a...

Help, I have a R2670 which had a symptom of morning sickness, it would reboot when cold and then it was okay after warming up. Now it does not boot and no screen. It gives me 1 beep, pause, 3 beeps, pause and 1 beep. Power supply is good except for 40 volt is giving 34 volts. I have a hard copy of t...