Re: Building SWCP Amplifone monitor - need some help debugging issue!

the spot killer will shut the beam off, but you can crank the brightness up and see everything with retrace lines. the spot killer is going off, so you should have good X and Y, if Z is faulty from the game pcb (a rare problem, but nothings impossible) you might get whats happening.

So, do you get an orange glow in the neck of the tube when its on and running? and what happens if you crank the screen voltage up, do you see everything but with retrace lines? (you should)

--
Andrew Welburn
http://www.andys-arcade.com
  ----- Original Message ----- 
  From: Scott McGovern 
  To: vectorlist@vectorlist.org 
  Sent: Friday, January 07, 2011 1:21 PM
  Subject: Re: VECTOR: Building SWCP Amplifone monitor - need some help debugging issue!
        Edward-
        Thanks for the reply.  Can you be more specific?  I would think that a problem in the game pcb would result in the spot killer being on.  I guess I could have two issues...a game board problem and a problem with the spot killer on the deflection board....perhaps my judgment is colored by the fact that the game pcb was pulled working from the same upright that my working Amp HV pcb came from.  I will try scoping the game pcb to make sure the game pcb is still working.  Also, though I didn't mention it, I did install a cinelabs HV flyback when I rebuilt the HV pcb 18 mos ago.
        Thanks,
        Scott
        --- On Fri, 1/7/11, EDWARD LUTZ <edward.lutz@insightbb.com> wrote:
          From: EDWARD LUTZ <edward.lutz@insightbb.com>
          Subject: Re: VECTOR: Building SWCP Amplifone monitor - need some help debugging issue!
          To: vectorlist@vectorlist.org
          Date: Friday, January 7, 2011, 7:44 AM
          Just because a vector game plays blind, does not mean the gameboard is "good". An issue in the video output circuit can cause a monitor to not work, and the game will still play blind.
          Edward
          ----- Original Message -----
          From: Scott McGovern <m_mcgover@yahoo.com>
          Date: Thursday, January 6, 2011 22:59
          Subject: VECTOR: Building SWCP Amplifone monitor - need some help debugging issue!
          To: vectorlist@vectorlist.org
          > I am restoring a Star Wars cockpit and I am at the stage where I 
          > am building the monitor, but I am running into a problem.  
          > I have nothing at all on the screen.  Here is what I 
          > know/done so far...
          > 
          > 1) The game plays blind, so the boardset is good.
          > 2) I had the monitor working very briefly when it was out of the 
          > cabinet.  When it was working, red and blue were not as 
          > bright as green
          > 3) Once the monitor got put into the cabinet, I never really had 
          > it working again.
          > 4) Deflection board - unknown, but behaves properly.  Spot 
          > killer comes on briefly, then goes out.  I hear deflection 
          > chatter.5) HV PCB was rebuilt and should be good...at least it 
          > was good when last tested in a SW upright I no longer 
          > have...since this issue started:
          >    a) I've re-soldered the focus and intensity wires
          >    b) I get ~19.5kV measuring anode with a HV probe
          >    c) I get ~180V measuring B+ on the one leg of CR3, 
          > the HV diode on the HV PCB next to the flyback
          >    d) I took the tube connector apart and tightened up 
          > the pins with needle-nose pliers.  I also measured 
          > resistance of all wires from tube connector to other end, all 
          > were < 0.4 ohms
          >    e) I measure ~ 2.5ohms across pins 9 and 10 of the 
          > tube connector, so the tube heater element should be good.
          > 6) The monitor is built from a 25" 100 degree tube, WG6100 
          > yoke.  I had to extend the yoke wires, the DAG ground, and 
          > the degauss wires.  I made sure the DAG ground is connected 
          > to both pins into the harness.
          > 
          > I do not see any neck glow.  This seems to be the big clue, 
          > but I cannot figure out why?  
          > 
          > I assume yoke and convergence magnet position would have no 
          > impact on my problem.
          > 
          > Please help!  I assumed that trying to converge the tube 
          > was going to be the biggest problem...
          > 
          > Thanks,
          > Scott
          > 
          > 
          > 
          >       
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