Re: More fun with Star Trek

I think the problem is that the manufacturers simply believed MOLEX when
they said their plugs would handle hundreds of pulls with no deterioration
of contact resistance.

If someone in the Vancouver, BC region would like to bring their Star Trek
U/R into my shop (phone for an appointment first!) I would be happy to show
them how to do the upgrade and I shall photograph the steps for my web
site. They would do the actual work (bring some 18 gauge wire), but I am
not going to charge for my time.

John :-#)#

At 11:16 AM 15/04/2003 -0400, Mark Jenison wrote:

>The grounding path of the G08 monitor is not visually obvious; in fact, you
>have to look hard to find where the monitor electronics are grounding to the
>chassis.
>
>The video "common" (gnd) goes into the input protection board, to the
>deflection board, and meets up with the center tap (CT) from the isolation
>transformer on deflection board, then then goes to pins 5and6 on the HV unit
>to provide the HV unit with ground. Then, a *single screw* in the upper
>corner of the HV unit board connects circuit ground to the metal case, which
>is then screwed to the chassis, thus providing ground to the chassis.
>
>The deflection board has a ground wire running the neck board (same pin that
>is connected to the DAG).
>
>Other than the ground at the power supply, broken solder joints at the input
>protection board, the deflection board where the input protection board
>plugs in, and the 10 pin connector on the HV unit all provide single points
>of failure, and broken solder joints are extremely common for this monitor.
>John's recommendations are basically providing a level of redundancy in the
>event that one of the existing paths fails. Other than CT and Video GND, I
>haven't seen the Sega XY games do any other grounding to the monitor than
>that. Maybe there was a reason for not adding additional grounding?
>
>---- Original Message -----
>From: "Christopher X. Candreva" <chris@westnet.com>
>To: <vectorlist@synthcom.com>
>Sent: Tuesday, April 15, 2003 11:04 AM
>Subject: Re: VECTOR: More fun with Star Trek
>
>
> > On Mon, 14 Apr 2003, John Robertson wrote:
> >
> > > I am now adding a jumper wire from the monitor mother board that will go
>to
> > > the monitor chassis, and then ground the chassis to the power supply
>with a
> > > heavy wire, and run a separate wire from the same point to the logic
>board
> > > ground plane (solder to the board if the logic boards are not connected
>to
> > > the cage).
> >
> > When I added a gound wire from my monitor chassis to the card cage
>chassis,
> > I started getting incredible distorion on my monitor. Are there specific
> > points that it is good to pick up the ground ?
> >
> > I had to build a complete new power cable from the power supply to the
>card
> > cage, so I have brand new connectors on both sides. Is this sufficent for
>a
> > 'fresh' ground from the PS to the cards ?
> >
> > -Chris
> >
> >
> > ==========================================================
> > Chris Candreva -- chris@westnet.com -- (914) 967-7816
> > WestNet Internet Services of Westchester
> > http://www.westnet.com/
> > --------------------------------------------------------------------------
>-
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Received on Tue Apr 15 10:28:50 2003