RE: Amplifone Pincushion Problem

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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