22 Feb
2004
22 Feb
'04
11:28 a.m.
On Sat, 2004-02-21 at 23:07, Tony Duell wrote:
Jules mentioned to me by e-mail that the blanking
pattern is not stable,
and that there's a lot of ripple on the output of the 48V regulator in
the monitor.
bleh - I meant to send that to the list and it went only to Tony. What
happens when posting whilst half asleep :)
These 2 observations must be connected :-) -- it
sounds like
excessive power ripple is upsetting the monitor's video circuity.
I would therefore check :
The 2 capactiors -- particularly the 0.1uF one -- on the regulator PCB
(on the back of the heatsink).
The following capacitors on the monitor main PCB :
C11 (47uF)
C10 (10uF)
C2 (1000uF)
C19 (47uF)
C3 (1000uF)
And
C3 (47uF) on the CRT base PCB
Nice one! Thanks, will take a look when I'm up there next (probably
Saturday, or possibly sooner if the enormous Marconi system we're
expecting delivery of turns up mid-week. Getting that through the door
is going to be a major challenge :-)
cheers
Jules