24 Dec
2003
24 Dec
'03
3:06 a.m.
Jules Richardson wrote:
I just unearthed a VT320 terminal at the very back
corner of one of my
store rooms.
Before I go any further... should it work with a VT220 keyboard? There
was no keyboard when I found it years ago, but I do have a couple of
VT220 keyboards lying around.
Secondly - it doesn't seem to be getting any HT output to the tube. The
green LED D509 is pulsing about once every second.
Is there a common failure mode for these things?
90%+ The flyback transformer. They used really cheezy ones in these
terminals. Often takes out the horizontal transister too. If you replace
those two components, it will likely come back to life.
I'm not too fussed about fixing it as I have a
couple of VT220s that I
can use as 'real' terminals anyway. If anyone wants it for spares
they're welcome to it (I'm in Cambridge, UK)