VT320 fault - flashing LED and no HT

From: Kevin Handy <kth_at_srv.net>
Date: Wed Dec 24 11:06:37 2003

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)
>
>
Received on Wed Dec 24 2003 - 11:06:37 GMT