I have a Waveteck model 3100 service monitor. I got this unit from a guy about 15 years ago and I think that I used it a couple of times and then put it away for awhile. I recently tried to use it and the keyboard is locked up and the LCD display reads:

"A1 Low

0 Drive"

I have the complete service manual, and although this error message is mentioned as an important one it does not elaborate on what it might be. It says to call the factory for tech assistance. I'm afraid that ship sailed long ago though. I don't know who might, or even if this unit is still supported anymore. This is admittedly an old unit but a nice one, and I'd really like to get it going. I have some old PRC77 military radios to repair and I could really use this thing. I know that there is a lithium battery inside that could be bad but the book mentions a different code for that fault. Can anyone please help me with this? Thanks, Lenny.