Re: Tempest twisting images...

Thanks Jeff, that helps! Version 3 is just one ROM image change,
isn't it? I currently have RV2 and Tubes installed...

John :-#)#

At 12:43 PM -0600 6/14/06, Jeff Hendrix wrote:
>Version 3 of the ROMs fixes this problem.
>What happens is the input protection board only see deflection in
>one direction and shuts down the inputs.
>Version 3 puts a copyright at the bottom of the screen and keeps the
>picture balanced, preventing the collapse.
>
>On 6/14/06, John Robertson
><<mailto:pinball@telus.net>pinball@telus.net> wrote:
>
>Found the problem. Turns out the replacement XY driver board I had
>left (from my parts stock) is a version P327 with the input
>protection circuit. I found that this circuit was the cause of the
>twisting by hooking my scope to the inputs of Q600 and Q700 and
>getting the same twisting, but not at the X & Y outputs on the
>motherboard. Hence something was a problem in this circuit. Replaced
>the two transistors Q804 & Q805, plus two of the diodes D806 & D808
>(Germanium I think) with 1N914s.
>
>Same problem. Poked around for another 1/2 hour...
>
>Gave up and clipped R810 & R811 - inputs to the protection circuit -
>and now the picture is fine.
>
>As Tempest originally worked without the protection circuit I am
>going to leave it disabled here - I suspect this circuit simply
>can't handle the patterns that Tempest throws up, or the capacitors
>are too low (88ufd instead of 100ufd, within spec +10/-20% for
>caps.). Still it looks great and I have to move on...
>
>I made a MPEG of the twisting image, if anyone wants a copy let me know.
>
>John :-#)#
>
>At 2:13 PM -0700 6/12/06, John Robertson wrote:
>
>>Yes, I tried tightening the pins on the sockets. Now that I think
>>of it the plug feels a little un-tight. I'll check stock to see if
>>I have a plug assembly with better bite. I did do the exchange
>>power transistor plug with the X transistors - the Y group won't
>>reach - to make sure the problem wasn't on those two. Forgot to
>>fully test the Y plug!
>>
>
>Will come back with part two tomorrow when I get back to the shop -
>currently I'm in the warehouse digging around:
><http://flippers.com/TimeTravelWarehouse.htm>http://flippers.com/TimeTravelWarehouse.htm
>
>
>There are a number of vector games there folks, good time to get
>good deals...bulk buys encouraged!
>
>
>John :-#)#
>
>
>At 9:58 PM +0100 6/12/06, simon wrote:
>
>>John
>>
>I had some strange image problems with bad Deflection transistor
>sockets, check they are good.
>
>Cheers
>
>Simon
>
>----- Original Message -----
>
>From: <mailto:pinball@telus.net>John Robertson
>
>To: <mailto:vectorlist@vectorlist.org>vectorlist@vectorlist.org
>
>Sent: Monday, June 12, 2006 8:39 PM
>
>Subject: VECTOR: Tempest twisting images...
>
>
>Ok, I'm lazy enough, but has anyone seen a situation with a Tempest
>monitor where the picture twists (+ Y axis) upon the display of the
>TEMPEST name for a second? Rather interesting distortion, I
>originally thought it was Q606 (2N3716) that was having life issues,
>but no, replacing it didn't change this distortion, then I tried the
>driver - MPUSU57 - again not the problem.
>
>
>Understand that I've re-capped the HV (stable voltages) and
>installed the LV2000 kit - stable +/- B voltages. Grounds are
>excellent, tried jumper wires to double check. Game seems happy
>otherwise, no smoke...connectors all inspected and solder built up
>on the monitor driver board pins as usual.
>
>
>There is also a twisting wave that appears in the picture on various
>levels - only during play, not in the attract mode - curiouser and
>curiouser.
>
>
>
>I thought it had to do with the speakers as it seemed to be most
>prominent when the sounds were very active (lots of shots,
>explosions), so I unplugged the speakers - no change.
>
>
>Yeah, pictures will be nice, but I'm off the warehouse right now to
>deal with other issues. Perhaps I can get them tomorrow and post
>them somewhere.
>
>
>Archives have nothing under twist or distortion that I can find
>relating to this...closest I found was "Tempest Boardset Barreling"
>by Dave Langley back a few years.
>
>
>John :-#(#
>
>--
>
>John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
>Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> <http://www.flippers.com>www.flippers.com
>"Old pinballers never die, they just flip out"
>
>
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>
>
>
>--
>
>John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
>Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> <http://www.flippers.com>www.flippers.com
>
>"Old pinballers never die, they just flip out"
>
>
>
>--
>John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
>Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> <http://www.flippers.com>www.flippers.com
>"Old pinballers never die, they just flip out"

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                  www.flippers.com
"Old pinballers never die, they just flip out"
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