On 2015-10-25 8:42 PM, Ian Finder wrote:
No- if it works with the standard display, the supply is fine.
Now that that's clear, I recall some cube supplies would do this without a load
for a display- I used to test them by triggering the power-on pin, and seem to
remember this behavior occurring if I didn't have a big-ass resistor attached
across the pins that normally supplied power to the CRT.
Try getting a dummy load on there, the circuitry you have may not be putting
enough load on the lines that usually run the CRT to keep the supply in a
steady state.
Even though I'm an electronics noob, that seems pretty logical. Can you
spell out what kind of resistor I'd need?
Is it the 20 Ohm 20W between pin 12 (-12V) and GND that is mentioned here:
http://www.nextcomputers.org/forums/viewtopic.php?t=1374&sid=80e5f0626eeb6a10eed066e21b61808d
Is 20W the right rating?
Thanks!
--Toby
Cheers,
- Ian
Sent from my iPhone
On Oct 25, 2015, at 16:37, Toby Thain <t...@telegraphics.com.au> wrote:
On 2015-10-25 7:21 PM, Ian Finder wrote:
I would replace the electrolytic capacitors in the power supply before going
further.
Well, the problem disappears with the standard setup. You still think caps
could be at issue with the splitter setup? What's your detailed thinking?
--Toby
Sent from my iPhone
On Oct 25, 2015, at 15:38, Toby Thain <t...@telegraphics.com.au> wrote:
On 2015-10-25 5:28 PM, Toby Thain wrote:
Hi,
After a few years I wanted to try my Cube with the soundbox/VGA splitter
configuration for the first time. (I have the fading phosphor N4000A so
have been keen to have an alternate video solution.)
However, all is not well. Using the keyboard power button, the machine
powers on for a couple of seconds, just long enough to see a NeXT logo
and grey desktop on the VGA (yay!) but then powers itself off again.
I did the obvious thing and tested it with a standard monitor and cable and
everything is okay. So the problem must exist with the splitter/soundbox setup.
Soft power signals?
Any suggestions welcome.
--Toby
Any clues?
Thanks in advance
--Toby
(not having a good classic computing week)
