On Wed, Oct 21, 2015 at 3:29 PM, tony duell <[email protected]> wrote:
> [VT100, etc, monitor PCB] > > > Is that true of the vt102 as well? > > I don't think I've ever worked on a VT102, but the same video monitor > boards turn up > in the VT100, VT105 and VT101 (at least). There are at least 3 different > types, at least > 2 made by Ball Brothers. From what I remember the 2 Ball Brothers ones > I've seen are > very similar, the main difference being the video amplifier. > > What is different between the terminals is the PSU. The VT100 and VT105 > use an SMPSU > that is actually quite friendly to work on (there is a separate linear > supply to start it up, > the pscillator and control circuits are on the output side of the > isolation barrier with > transformer coupling to the base of the chopper. The VT101 has a big mains > transformer > and a linear regualtor board. > > -tony > VT101 and VT102 are the same, the 01 and 02 pertain to options that come with the terminal. I would *assume* they have the same PSU. -- Bill
