Disabling the CRT of an N4000A

[Martijn van Buul]

Hello.

I wonder whether it is possible to disable the CRT of an N4000A B/W
monitor. I have some plans with my NeXTstation, which involve quite a
bit compile time. The CRT is still crisp and bright, which I'm told
is not a very usual state for these beasts, so I'm a bit reluctant
to leave it on for a long period of time when there's absolutely no
need. So I was thinking of adding a small on/off switch to turn off the
CRT (And only the CRT), leaving the "soundbox module" as is.

A while ago, somebody posted a pinout of the internal header of this
soundbox board:
connector J8 (as seen from top): 1 2 3 4 5 6 7 8 9 |_ _| 1,2 +12V 3 GND 4,5 -12V 6 HSYNC 7 GND 8 VSYNC 9 GND

I suppose a double throw switch on the 12V and -12V would do just fine to
turn off the CRT, but will the rest of the circuitry respond nicely to
this, or do I need to add a dummy load? Will the parasitic load on the
HSYNC, VSYNC and video signals be a problem?

Kind regards,

Martijn

--
Martijn van Buul - Pino@dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov

[David Evans]

In article <slrnc2a1c8.15u4.pienjo@mud.stack.nl>,
Martijn van Buul <pino+comp_sys_next_hardware@dohd.org> wrote:So I was thinking of adding a small on/off switch to turn off theCRT (And only the CRT), leaving the "soundbox module" as is.

Do you need to switch the monitor on and off without rebooting? It
might be easier to just buy a sound box.

--
David Evans dfevans@bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo "Default is the value selected by the composer
Ontario, Canada overridden by your command." - Roland TR-707 Manual

[Martijn van Buul]

It occurred to me that David Evans wrote in comp.sys.next.hardware: In article <slrnc2a1c8.15u4.pienjo@mud.stack.nl>, Martijn van Buul <pino+comp_sys_next_hardware@dohd.org> wrote:So I was thinking of adding a small on/off switch to turn off theCRT (And only the CRT), leaving the "soundbox module" as is. Do you need to switch the monitor on and off without rebooting? It might be easier to just buy a sound box.

NeXT stuff isn't easy to come by over here in the Netherlands :(

--
Martijn van Buul - Pino@dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov

[David Evans]

In article <slrnc2aco2.1baf.pienjo@mud.stack.nl>,
Martijn van Buul <pino+comp_sys_next_hardware@dohd.org> wrote:It occurred to me that David Evans wrote in comp.sys.next.hardware: Do you need to switch the monitor on and off without rebooting? It might be easier to just buy a sound box.NeXT stuff isn't easy to come by over here in the Netherlands :(

Fair enough. However, a sound box is small and shipping from elsewhere
might not be too expensive.

--
David Evans dfevans@bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo "Default is the value selected by the composer
Ontario, Canada overridden by your command." - Roland TR-707 Manual