Re: Tempest twisting images...

Does it have the little satellite board that sits parallel with the main
PCB? If so, that may be causing the collapse as it is sort of a
clampdown circuit. Make your screen smaller and see if the collapse
stops. If so, you might want to take off the protection PCB.

John Robertson wrote:
> Additional info.
>
> This has a LV2000 voltage regulator kit installed, and this is a
> monitor effect as the problem does not show up when using a scope set
> on XY with the monitor disconnected. the monitor works just fine on
> the XY convergence generator by the way, and all images are good
> except for the unbalanced ones (more image on the top than the bottom)
> for TEMPEST name and between player screens. All the tubes, etc. work
> fine, the game is totally playable - it is an irritating video artifact.
>
> John :-#)#
>
> At 1:16 PM -0700 7/26/07, John Robertson wrote:
>> OK, now have another Tempest c/t in the shop, with the same !@#$!@#$
>> twisting of the image between players and when the "TEMPEST" name
>> comes up. I HAVE installed the H1 Eprom (.318) version that displays
>> the copyright info, but the picture still twists the left side of the
>> word "TEMPEST" once it is full size and in white.
>>
>> Heck, the game works fine, and I do not have enough hours to
>> troubleshoot something the customer is not complaining about.
>>
>> Oh, the machine does have the rev 2 ROMs (2716s) installed and the
>> checksums match the notes on this problem. The monitor does not have
>> the input protection board either.
>>
>> John :-#(#
>>
>> At 12:25 PM -0700 6/14/06, John Robertson wrote:
>>> 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* <pinball@telus.net
>>>> <mailto: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
>>>>
>>>>
>>>> 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:* John Robertson <mailto:pinball@telus.net>
>>>>
>>>> *To:* vectorlist@vectorlist.org
>>>> <mailto: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)
>>>> www.flippers.com
>>>> <http://www.flippers.com>
>>>> "Old pinballers never die, they just flip out"
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> No virus found in this incoming message.
>>>> Checked by AVG Free Edition.
>>>> Version: 7.1.394 / Virus Database: 268.8.3/361 -
>>>> Release Date: 11/06/2006
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> 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 <http://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 <http://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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Received on Thu Jul 26 21:10:22 2007