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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