re: G05 issue

Sounds like R602 pot is misadjusted or broken. The input clamping circuit may be limiting Y.

Another possibility, check the positive and negative DC supply levels B+ and B-. One of those rails may be too low.
The one to check is indicated by which half of the screen has the problem. I forget off the top of my head which is
which or I'd just say.

Bill Boucher
http://www.biltronix.com

>
>
> I had a similar isse back in 2008 with a g05, but I don't have a clue what the solution was. Well fast forward to
> today and I have a new battlezone basketcase I just got. The deflection was in bad shape. I recapped everything, new
> side transistors, and went to work on verifying all else as the monitor just would not function in any respect. One of
> the connectors had the metal posts come off the pcb. So the guy soldered wire on the underside to join the bottom of
> the posts to positions on the pcb. The wiring is done correctly and should work. A couple of the posts were not
> completely through the pcb and had lost some contact so I melted the solder, and pushed the posts through the pcb so I
> could fasten them a lot better. After all of this, the monitor now finally works, but I have the same issue as below,
> only it is the bottom that is compressed. Its maybe 1/4 to 1/3 of the bottom of the screen that is compressed into a
> line that vibrates much like a
> loose connection would cause.. but I have verified all the connector posts for continuity. The top 3/4-2/3 of the
> screen is rendered absolutely fine. Is there anything other than a connector issue that could cause this?  
> ---------------------------------original post 2008------------------------------------
> This monitor was working fine, then a bunch of resistors in the Y section fried after a 3906 died. I replaced all the
> burnt resistors, the 3906 and tested every other transistor and diode..all were fine. Put deflection back in and only
> got a thin line across the center horizontally.. threw in another deflection and it worked, so HV and frame
> transistors were good.. Well after pulling out my hair, went through every resistor and found the large 2ohm wirewound
> one in the Y was in the meg-ohms.. something must have happened to it.. so swapped out with another one, and it looked
> like the monitor was working when I fired up Omega Race..until the text wrote out to full screen.. I still have an
> issue.. When something is displayed over the whole screen, I have about the top 1/3 compressed into a horizontal
> line..but the rest is fine. It is more than half the screen as the center box in Omega Race is complete..another inch
> or two above that box is where it  compresses... I've verified pretty well everything I can on that side of the
> deflection.. does this point to anything I can maybe re-check?
>
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Received on Tue Feb 21 19:07:38 2012