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

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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Received on Fri Jan 7 07:44:28 2011