Re: Amplifone Pincushion Problem

Look at the yoke on the tube. It may be a WG and not an Amplifone. My 25" has
a WG on it and does pincusshion.

JB

Chris Starr wrote:

> Make sure if any resistors were replaced that the ones that are supposed
> to be "non-inductive" in fact are.
>
> My .02
>
> c-starr
>
> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com] On Behalf Of Dave Langley
> Sent: Saturday, January 18, 2003 3:41 PM
> To: Vector List
> Subject: VECTOR: Amplifone Pincushion Problem
>
> Hi ...
>
> The Amplifone 25" fitted to my Star Wars Cockpit has a pincushion
> problem
> with it that almost 'feels' like it's a WG. There's a picture of it
> problem here:
> http://homepage.ntlworld.com/sally.langley/temp/Amplifone_Pincushion.jpg
> (39Kb)
>
> This is the games original monitor with both boards being green, it has
> been recapped, 0ohm resistors replaced with wire, a new WINTRON fitted
> and
> most of the semis on the boards (especially the X and Y deflection
> stages
> where all but a few of the diodes have been done) yet the problem
> persists. It's definitely the monitor as the fault is not apparent when
>
> using my 'scope in XY mode. Any ideas?
>
> Another problem I had with it the other day was the X axis was 'tearing'
> by
> up to an inch. After I spent ages fault finding I traced it to the X
> size
> pot on the Amplifone Deflection PCB. Since you also have an X Size on
> the
> game PCB, can I just remove this pot or do I need to replace it. I've
> got
> it adjusted to a place on the pot where I don't get the fault for now
> but
> that's not really a proper solution is it.
> http://homepage.ntlworld.com/sally.langley/temp/Amplifone_Tearing.jpg
> (37Kb).
>
> Lastly, does anyone have a Positor for an Amplifone Deflection PCB
> they's
> sell me (or a whole PCB suitable for refurbishment will be fine) since
> I'm
> running my game with the degaussing coil disconnected.
>
> Dave Langley
> www.robotron-2084.co.uk
>
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Received on Sun Jan 19 13:17:46 2003