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It looks like some attachments didnt get posted with the main post. On the silk screening on the underside you can also see KTM 901213

Fixing arcade games all the time.

Hi all, Currently I have a Kortek KTM monitor I pulled from a bubble bobble sitting on my workbench. Unfortunately it does not have schematics identifying labeling silk screened anywhere on the board. I am wondering if anyone here can help me source an accurate schematic for this device. I have...

Would anyone be able to link a source to this diagram? I have been unable to find one online. Additionally would I be able to boot up the sinistar in another machine by simply replacing the ROM board(Joust or Robotron are my options i believe both have the same MPU revision with decoder roms...

Much appreciated, thank you for your explanation!!!

It was not allowing me to post a video. The below photo is consistent with the black bar scanning from left to right but dependent on V-Hold. Some rug pattern can be seen briefly every once in a while. Additionally, why should I not test the 12V directly on the ram, just curious. In addition...

Looking again at the Sinistar today. I ran both Sinistar and Robotron in the sinistar cabinet. Robotron was run with its own ROM board as well and I was able to get robotron to launch in the existing machine using the same harness as Sinistar. During this time I was also able to verify the video...

My mistake, I returned all components to the robotron main board and was able to successfully launch the game. I was also able to launch the game with the video decoder proms and the CPU from the sinistar cabinet when transplanted into Robotron.

Same error code In this case represented by 1-3-1 instead of 0-3-1 using MPU and Decoder roms from Robotron with Sinistar IO board disconnected. No Rug pattern.

After swapping both decoder roms and the MPU I still have error 0-3-1 with no rug pattern. I also replaced the 74153 chip at location 4F with no change in board operation.

Hi Brad, I have two quick questions for you, First off, I have a Robotron in good working condition with original video decoder proms. The CPU board revision is the same and the robotron and sinistar decoder roms have the same numbers. Am I correct in assuming that these are interchangeable...

Hi yall, Currently doing my best to troubleshoot and repair a sinister that has recently failed. While operational, I did notice high score corruption occurring. I have already gone through and checked all voltages, which are good, and removed and replaced the Ram at position 3-1 as well, this...

Hi all, Currently I have a Kortek monitor silkscreened as a Kortek KTM that I am unable to find accurate schematics for. It has a strange layout with some fuses and power being delivered outside a housing for the flyback, something that makes it appear distinct from the kortek ktm-F or the...

I would additionally recommend replacing the CMOS battery on your motherboard. The 3dfx card can only display game-play and if your CMOS battery is causing your PC to fail to boot you would not see any text indicating what is occurring.

Hi all, I recently came into possession of a freshly recapped k7000 25" monitor screened p538. After throwing it into a sunset riders cabinet (with a composite sync daisy changed through the last two pins of p1.) I encountered the issue that can be seen in the screen image attached. The tearing...

Ok results of troubleshooting are in and its most probably a bad graphics card

Follow up question, If you leave the main power running, and then turn off your PC, does your force feedback motor run continuously. I know at least one of my attached graphics cards is bad. The motor will run if PC is off no matter good or bad card

Hi Billybob, I have an offroad thunder machine with a similar error presentation. It is unfortunate as I have two machines and both of which follow the same error message beep pattern (which is very similar to hydrothunder's startup pattern and in fact is probably not an error code) but only one...