Nope. I don't
own a rejuvinator. Anyone out there have one for sale
that works with amplifone's for a reasonably price?
Any chance this would actually help fix it or at least
diagnose the problem?
---
Hey John, I am by no means a
guru here, but do you have access to a
rejuvinator? They can tell you a few things about
the condition of the tube. Shorts being one of
them.
Jordan B
On Sun,
Jul 24, 2011 at 8:38 PM, John Huie <jehuie@sbcglobal.net>
wrote:
John said, "I suspect
that signal is your problem though.
Either it is not coming from the
board or it is not amplified by the
monitor chassis or possibly the
picture tube has a cathode short and
this negates the Z-axis level
completely. Not sure about that last
hypothesis though..."
Thank you John. I'm focusing on
that last part you said now because
it makes sense to me. I'm thinking
that you mean if I measure the
voltages on either of the 3 color
signals from the SW CPU board that
will indicated my Z signal,
correct? Which is why I really need
a scope.
However, since both my SW boards do
the same thing and work fine in my
other SW game, they are clearly
generating the Z signal. Which
leaves the other two options.
It seems unlikely that all 3 colors
would be having problems amplifying
by the monitor chassis. And since
the dot in the middle is pure white,
I think we can negate that
possibility. I'm not sure this is
true but I'm not getting a lot of
feedback so that's my best guess.
So that leaves me with a short in
the monitor as being my most likely
culprit. I tested for a short at
the pins and only found a short
going from the heater pins to pin
4. I'm still not sure if that is ok
or not though. And if it's a
problem, whether there is a work
around or if it means I'm screwed
and need a new tube.
Help. Pretty please!
John Huie wrote:
Just
to refresh...this
monitor on this
Star Wars works
good and the
graphics are all
there and
everything but
there's a constant
bright dot in the
middle. If I turn
the brightness
down enough for
the dot to go away
then I can't see
the other graphics
at all.
Here's what I've
tried so far:
- Bought a whole
slew of components
from Bob Roberts
to rebuild the
deflection board
and HV board
- HV is good.
- B+ is good.
- Adjusting color
drives doesn't
help. Brightness
down and the color
drives up still
won't let me turn
down dot enough to
see graphics well.
- I don't have any
spare parts to
swap in. I only
have 6100 vectors
other than this.
- double checked
continuity from
focus block
wiring, all
connections under
boots are good.
Good continuity
back to HV board
and color drives
on deflection
board are good.
- Pins on neck not
shorted to heater
pins. (Except pin
4 which isn't used
- could this be a
problem?)
- W jumpers are
all long gone.
- Resistors in
neck board/ring
are good.
- Does same thing
with known working
PCB set.
- Reflowed J103
and tested
continuity along
wires.
- Ground to neck
board/ring is
good.
Still not sure how
to check Z signal.
What components
should I be
looking at that
are common to all
3 colors that
could be causing
this?
Any other idea?
Thanks everyone.
I'm working on
this for a friend
of mine and just
about at the end
of my rope. |
Z-Signal is the brightness.
What sort of test equipment
do you have? A 'scope would
be best - you could check
that the signal is varying.
An AC setting on your
multimeter will give you an
idea if there is change on
that signal, but I do not
know what the result should
be for your meter or
situation. If someone here
has a voltmeter and can see
what reading they get on the
Z-level when the board is on
a set screen test that would
help you figure out if yours
is working properly.
I suspect that signal is
your problem though. Either
it is not coming from the
board or it is not amplified
by the monitor chassis or
possibly the picture tube
has a cathode short and this
negates the Z-axis level
completely. Not sure about
that last hypothesis
though...
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"
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