27 May
2008
27 May
'08
8:26 a.m.
A list member emailed me saying there appeared to be a problem with the list. When I
looked at the server
I saw the usual problem, fixed it, and neglected to check further (this is a reoccuring
problem that I have
to "fix" every month or so). I assumed as usual this would fix the problem and
was in a hurry to get out the
door.
Turns out, this time there was also something else amiss, so I went through a day or two
of "it's already fixed"
emails, only to find out it wasn't.
My apologies, all should be well now.
Jay West
27 May
27 May
6:49 p.m.
New subject: Apple B&W monitor schematic needed G090S
Anyone have this schematic for the Apple B&W 9" monitor? I have one that
I am using, but the screen bias is way off so the screen is overdriven
(horizontal retrace lines showing). Need to find if it is an adjustment
or a bad/leaky capacitor.
Thanks,
John :-#)#
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
28 May
28 May
1:17 p.m.
New subject: Apple B&W monitor schematic needed G090S
On Tuesday 27 May 2008 21:49, John Robertson wrote:
Anyone have this schematic for the Apple B&W
9" monitor? I have one that
I am using, but the screen bias is way off so the screen is overdriven
(horizontal retrace lines showing). Need to find if it is an adjustment
or a bad/leaky capacitor.
No schematic, but look and see if there's a small board on the base of the
CRT. Usually is on most stuff of relatively recent manufacture, and that's
where they'd put the adjustment, or at least they do with color stuff.
You'll also find the pins of the CRT labeled in many cases, which makes it
easy to determine the bias of the tube -- cathode voltage and g1 voltage
should be very different, at least 20-25V for a mono monitor, maybe even
more, depending on the HV. Measure those and post back and we'll see what
it looks like from there...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
1:21 p.m.
New subject: Apple B&W monitor schematic needed G090S
Anyone have this schematic for the Apple B&W 9" monitor? I have one that
I am using, but the screen bias is way off so the screen is overdriven
(horizontal retrace lines showing). Need to find if it is an adjustment
or a bad/leaky capacitor.
Well, unless somebody has been inside there with a screwdriver, the
adjustments are not going to have moved. Which means if there's a now a
fault then something has failed...
-tony
14 Jun
14 Jun
12:04 p.m.
New subject: Apple B&W monitor schematic needed G090S
On Tue, 2008-05-27 at 18:49 -0700, John Robertson wrote:
Anyone have this schematic for the Apple B&W
9" monitor? I have one that
I am using, but the screen bias is way off so the screen is overdriven
(horizontal retrace lines showing). Need to find if it is an adjustment
or a bad/leaky capacitor.
A1 resistor going high?
Gordon
5809
days inactive
5827
days old
4 comments
5 participants
participants (5)
-
ard＠p850ug1.demon.co.uk -
gordonjcp＠gjcp.net -
jrr＠flippers.com -
jwest＠dewey.classiccmp.org -
rtellason＠verizon.net