[Previous] [Next] [Hitlist] [Get Thread] [Author Profile] [Post] [Post] [Reply] ---------------------------------------------------------------------------- Article 10 of 15 Subject: Re: Upside down monitor From: ray@mayo.edu (Ray Ghanbari) Date: 1996/06/12 Message-Id: <4pmf9g$nn3@tribune.mayo.edu> Distribution: world References: Organization: Mayo Foundation Reply-To: ray@mayo.edu Newsgroups: rec.games.video.arcade.collecting In article jsvare@minn.net (Jim Svare) writes: > I have a robocop jamma cabinet that has always worked fine. Recently I > purchase some horizontal jamma games to use in it, unfortunately the new games > are upside down. I noticed the robocop board has a normal/reverse switch and > is in the reverse position. The monitor chassis seems to be mounted correctly, > what is the best way to flip the picture? This is an odd one. Usually people need to flip vertically mounted monitors, since "up" is ambiguous. Anyway, just follow the same procedure you would use to flip a vertically mounted monitor. Here is a post from Rick describing the procedure. Before you start, make sure that you are reversing the correct set of wires (!) and that you are comfortable risking your hide playing in high voltage area behind your monitor. -- Ray Ghanbari Mayo Foundation ray@mayo.edu ******************* Newsgroups: rec.games.video.arcade.collecting From: rls@intgp8.ih.att.com (-Schieve,R.L.) Subject: Re: Have 4PDT switch but can't figure out yoke wires.. Organization: AT&T Date: Mon, 28 Aug 1995 18:52:22 GMT In article <7964152743401@inferno.com>, wrote: > >> I want to be able to invert the picture on my vertically oriented >>JAMMA cab!!! >> >>I've got the 4 pole double throw switch and Rick's doc on how to >>wire it but I haven't bee able to figure out which yoke wires >>are what and I don't want to get this wrong. >> >>I saw a post on determining the pairs by resistance but I seem >>to have 5 wires going to the yoke with some resistors wired into >>them. I haven't seen any monitors with 5 wires to the yoke but then I haven't looked carefully at a K7000 but will try to remember to do so. >I would like to know how to do this too. I have a Wells Gardner >K7000 25" inch. I have red, yellow, blue, and another color >wires for yoke. > >-Jim Hernandez OK, this question has come to me 3 different ways now so I guess I should clarify. The switching is done on the wires to the yoke (not the neck board). The yoke has 2 sets of windings, one set for vertical deflection and one set for horizontal. So let's say standand configuration looks like (and the colors I choose are purposely random): orange---------------------) ) ) Horizontal winding ) ) pink-----------------------) violet---------------------) ) ) Vertical winding ) ) white----------------------) And to invert the screen they have to be connected like: orange--\ /--------) \ / ) \ / ) Horizontal winding / \ ) / \ ) pink-----/ \--------) violet--\ /--------) \ / ) \ / ) Vertical winding / \ ) / \ ) white----/ \--------) As I said the colors I picked are purposely meaningless. You have to determine what goes with what depending on the monitor. So either look at a schematic for the monitor to determine the colors of the wires to winding of the monitor or unplug the yoke from the monitor chassis and figure it out with an ohmeter. The following is a repeat of my previous posting for thoses that missed it: ----------------------------------------------------- I've had several people ask me how to reverse polarity with just a switch so I'm posting what I sent someone recently. Start by thinking about a double pole/double throw switch wired as below: ________ | | --------0 0 0 |---------- in out --------0 0 0 |---------- |______| The "0"s are the six poles. The only thing not shown due to ascii limitations is to connect the upper right 0 to the lower left 0. Then connect the lower right 0 to the upper left 0. With the switch in one direction in will equal out. In the other direction the polarity of the output leads is reversed. You need to do this to each of the pairs of wires to the deflection yoke. There are switches available that are equal to 2 double pole double throw switches and if you use one of these you only need one switch to completely invert the picture. I've used a switched wired like this on my vertical universal cabinet for years. Make sure the switch you use can handle at least a few amps of current and that the monitor is powerred off when you use the switch. I made sure the power is off when I switch mine by putting the switch just inside the coin door and using one of those power interlock switches behind the coin door so when the coin door is open power is off. Rick Schieve rls@intgp1.att.com ---------------------------------------------------------------------------- [Previous] [Next] [Hitlist] [Get Thread] [Author Profile] [Post] [Post] [Reply] ---------------------------------------------------------------------------- Home Ê Power Search Ê Post to Usenet Ê Ask DN Wizard Ê Help Why use DN? Ê | Ê Advertising Info Ê | Ê New Features! Ê | Ê Policy Stuff Copyright © 1996 Deja News, Inc. All rights reserved.