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. >
