Sorry. That reply was full of jargon. :( Vee is a technical designation for one of the power options (rails) on the system.
The internal power supply on the M100 (in internal circuit on the logic board) takes the battery (Vbatt) or external power supply and creates several voltages used by the system. These are designated Vdd for the +5V and Vee for the -5V supply. The -5V supply is used by the LCD display and is generally associated with contrast issues. You can find a copy of the M100 service manual online in various places, including: https://archive.org/details/m100service/ This manual tells you where to check the voltage on Vee and which components to check if the voltage is off. -Josh On Tue, Apr 9, 2019 at 8:49 AM Thomas Morehouse <[email protected]> wrote: > > Thanks Josh. Sorry, but I don't know what "Vee power supply" means. > > Lost in the terminology I'm afraid. > Tom M. > > > On Tue, Apr 9, 2019 at 8:46 AM Josh Malone <[email protected]> wrote: >> >> Might indicate issues with your Vee power supply. This should be -5v. >> I don't see any connection between Vee and the RS-232 circuits in the >> service manual though. >> >> On Tue, Apr 9, 2019 at 8:33 AM Thomas Morehouse <[email protected]> >> wrote: >> > >> > Now that I've got my usb/serial link working (M102 to Dell laptop), I >> > notice the 102's screen get quite dim when the cable is in the 102's 25 >> > pin serial port. >> > >> > Doesn't need to be connected to the Dell. Just when you plug the >> > usb/serial cable into the 102. Unplug the cable, 102 screen returns to >> > normal visibility. >> > >> > Something to worry about? or just live with it? I wouldn't have thought >> > the usb/serial cable chip would put such a drain on the system. Happens >> > with battery power, or even with external 6 volt poweer. >> > >> > Thanks. >> > Tom M. >> >
