Perq 2T1 display fault

From: Jules Richardson <julesrichardsonuk_at_yahoo.co.uk>
Date: Sun Feb 22 11:28:35 2004

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
Received on Sun Feb 22 2004 - 11:28:35 GMT