Curseur

Thank you all for your kind and useful replies. @NEO-GEO Man: I'll try to remove the yoke and clean the inside up. Some magnet residue may lie in there and could cause some of the troubles. I'll get a replacement yoke as a last resort ;) @namastepat: Yep, this is the usual 15khz NeoGeo crosshatch. The thing is this chassis is entirely OSD. I know there is a jumper of some kind on the manual MS-2930 chassis, or the MS-9 chassis you're reffering to. Unfortunately, no such thing on the MS-2931. Even looking deeper in the factory settings. I will check the ground cable that hooks up the neckboard. Thanks !!! @soyl: By YCH trimmer do you mean the convergence rings at the back of the tube ? Cheers

Hi there, My MS-2931 Chasssis suffers several issues. First, It has H-Linearity problems : the image is compressed on the right side of the picture. I suspect this is something wrong on the chassis, but not sure at all. Do you have an idea of where to start looking ? Then, geometry issues. As you can see on the test grid, both the left and bottom sides of the pictures shows wavy lines. The lines drawn on these extremities are not straight. Finally, convergence issues which can be addressed with magnetic /ferrite strips. I guess. Any insight would be welcome :) Cheers

Hi Jomac, Many thanks for your reply. As a matter of fact, I was offered an opportunity to purchase a MS2931 chassis with both the choke and one BU transistor missing. With your info in mind, I shall probably not get this chassis, even for spares. Thanks, C.

Hi Guys, Does anyone know what replacement would be suitable for a coil on the MS-2931 chassis, the one that has the black goop of death issue? This component is located @L512 and described as ETS75. Cheers, C.

Hi there, I'm looking for the Taito System B schematics, more specifically for Violence Fight ... Thanks for your help, Cheers, C.

Hi Guys, Finally solved this one. I came accross a bootleg board from a friend of mine, and it appears that the ceramic component was replaced by a daughterboard on exactly the same connector. It is composed of two LS245, one LS04 and one LS32 : Cheers :) -- C:\>

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Hi there This is my Repair Log for a Bootleg Rygar Board. I bought this board as Untested on eBay from a French seller. This is the 44 edge connector which is interesting because it carries out the RGB signals without having to use an extra adapter (as for the original board). 1. Symptoms : No image Diagnostic : Ripped oscillator. Solution : Resolder the oscillator. Image back and PCB now booting to the TECMO welcome screen :) 2. Symptoms : the image looks like duplicated in four parts, sprites and title displayed incorrectly Diagnostic : This Rygar bootleg board is made of two main PCBs (one main CPU and sound PCB, another one in charge of display) and two daughter boards which replaces the custom Mitsubishi chips on the original. Luckily, I have another Rygar bootleg board. Swapping the video board from my another board shows the same problems. I therefore must investigate on the main CPU. ROMs were tested OK as per MAME. Thanks to the schematics, my investigations led me to the 6116 Video RAM, where several outputs were tested KO. Piggybacked a valid 6116, sprites and title were displayed much better but not perfect. I think I have a suspect at this stage ! Solution : Replaced the 6116 RAM @J2, title and sprites displays perfectly. 3. Symptoms : No sound. Diagnostic : Touching the solder side of the amp makes static noise. Main sound amp does work. Sound Z80 is also tested OK (I swapped the two Z80s present socketed on the board). Sound ROM is also ok and matches the CRC in MAME. YM3812 sound chip is also OK. Capacitors looks fine and not ripped at all. This leads me to the last element in the sound circuit which is *also* a 6116 RAM. Piggybacked a valid 6116, sound is back :) Solution : Replaced the 6116 RAM @D6, both music and samples plays perfectly. Board repaired :)

I must say I am most impressed ChannelManiac, you are a true genius. On the bootleg boards (I have 3 of them), there is a 74LS245 instead of the epoxy component. I'll check the Z80 inputs on my boards to find out what where the replacements used in the boots.

@channelmaniac : I myself took the image from an eBay auction here : http://www.ebay.com/itm/152058380506 ^^

@Gemini2544: Introduction done ^^ According to the MAME source code, this is a Mitsubishi MA7053 ceramic module and it looks from a couple of bootleg boards that a LS245 is a direct replacement, but it might be more than that. Most of the Rygar bootlegs shares the same program roms as the originals listed in MAME. - - - Updated - - - This is a pic of the usual suspect

It was about time to register to AA. I've been following the board for several months now finding an incredible amount of technical information specially when it comes to repair logs. In a nutshell, I was born sometime in the mid 70s making me an arcade enthusiast for decades now and I do live in Paris. I was fortunate enough to visit an arcade manufacturer warehouse in the early 2000s, PVG Semco that used to build the Hanaho Hotrod for PCs (I wrote a little report of my visit here : http://www.neo-arcadia.com/forum/viewtopic.php?t=49903). Glad to be here :) Cheers !!

Hi there, I am looking for a substitute to the red epoxy custom chip on the original Rygar PCB. On bootlegs boards, this seems to have been replaced by a 74LS245 .... Thanks for your help :) C.