Digital VT420 repair?

Bill Degnan billdegnan at
Wed May 23 08:04:08 CDT 2018

when you power it on, the keyboard light should activate, the screen should
display the initialization graphic pattern, print wait on the screen and
then beep.

My 420 is a little dimmer than I'd like it to be, I assume there is a fix
for that internally (read the manuals), but if you're not even getting the
beep nor the keyboard light  you have bigger issues than I.


On Wed, May 23, 2018 at 8:35 AM, Waldemar Brodkorb via cctech <
cctech at> wrote:

> Hi,
> after my Micro PDP11/83 boots up, I like to connect a Digital VT420
> to the console port. This worked approx. 10 years ago. Now when I
> poweron the VT420 I get no message on the screen. The f3 key doesn't
> give me the configuration menu.
> Is it broken? Does it have some invalid configuration in NVRAM and
> can be resetted?
> I tried changing brightness and contrast, no change.
> Is it normal that the right LED is always on? See the picture.
> I tried with and without serial connection to another system.
> Thanks for any advice,
>  Waldemar

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