Guru's Reverse-Engineered Parts Page

#	Description	Schematic	Images
001	Konami 054986A Audio module used on several Konami arcade PCBs including Lethal Enforcers, GI Joe, Violent Storm, etc First schematic was done in 2017. Second schematic was done in 2022 and has more detail.
002	Konami 005273 Custom resistor array used on almost all 80's and 90's Konami arcade PCBs for the inputs
003	Taito 48CR-1 Custom resistor array used on several Taito arcade PCBs for the inputs
004	Seibu HB41 Audio module used on several Seibu/TAD arcade PCBs including Cabal, Raiden, Toki and some others like Operation Wolf, etc. The actual cost to make this was about $6.00
005	Seibu HB45A Audio module used on some Seibu arcade PCBs including Raiden II and *some* versions of Zero Team and Raiden DX. The actual cost to make this was about $6.00 and most of that cost was the tantalum capacitors. This was originally reversed by 'Pacman70' (old schematic shown to the right, with corrections) and was immediately targeted by the usual 'perp' as useless and incomplete. You can read it here (mirrored locally). This is quite funny. - Firstly the voltage on the module is completely irrelevant. The input power comes from the main board where this module is plugged in. It is of course +12V on pin 9 of the module so any voltage on the schematic doesn't affect it. - Secondly, the comment says there's no voltage on pin 8 of the NJM4560 op amp (it's just a LM358) and the 2x 2.2uF caps. Erm, they are *clearly* connected to pin 9 of the module so they are automatically connected to the power. - Thirdly, the comment says the resistors under the NJM2060 op amp (it's just a LM324) are missing. I suggest you get your eyes checked buddy, they are there at R4, R5, R6, R10 & R11 LOL!!!! So this proves the 'perp' didn't reverse it because if he did he would have known all of that and a lot more. He either paid someone to do it or a different person did the reversing and he just ripped it off LOL! I suggest next time someone posts a schematic for something you just keep your big mouth shut LOL! I reversed a module I have here and checked everything. Once the parts are removed it's actually not that complicated. I scanned the board and quickly cleaned it up in Photoshop and used that for verification when routing it. I found the only mistake on the other schematic was C6 value is missing (it's 10nF) and C5 is supposed to be wired to pin 12 of the op amp not to the center of the 2x 33k resistors. All things considered, the original published reversed schematic was a pretty good effort. Remember anything published is better than hoarding everything and publishing nothing ^_^ Of course I re-reversed everything the 'Guru way' so the schematic is now perfect and better than everything before it hehe! The footprint of the op amps covers both the 150mil and 200mil versions and the rest of the design mirrors the original (i.e. no vias). This is effectively a 1:1 identical copy but using modern technology so it is repairable now.	New Guru Schematic old schematic
006	Taito TC0070RGB 15-bit RGB DAC used on several Taito arcade PCBs including Chase HQ, SCI: Special Criminal Investigation, Operation Thunderbolt, Cadash, Ninja Warriors, Darius and many others. The legs often break off these or they get snapped in half by careless losers so it's better to just replace it with a proper solid PCB version. The actual cost to make this was about $5
007	DECO CPU-7 Custom potted CPU module used on a few Data East games such as Burger Time and Zoar
008	DD1718PA Boost Module Small module used to get higher voltages from a lower input voltage. This will output positive AND negative voltage. Simply change R1 to get a different output voltage.
009	IGS PGM Cave bootleg cart Full schematic for a simple IGS PGM board-set you can make that plays 3 Cave bullet-hell shoot'em-ups.... Espgaluda, Ketsui and Do Donpachi Dai-Ou-Jou.
010	Full schematic for a Sega SC3000 multi-cart with 4MB capacity. This holds basically every SG1000 and SC3000 game ever made.
011	Full schematic for Namco System 23 main board. This is an 8-layer board. This took around 12 hours per day full time for 8 weeks to reverse. As well as showing all the connections, all clock signals on all chips across the entire board have been measured and noted on the schematic and brief descriptions of what all the custom chips are doing, as well as some chip-related repair infos. The schematic is a single sheet approximately 2 meters square. To give you an idea how big this is, the NAMCO SYSTEM 23 text at the top is 100mm high. Yes, really.
	More coming soon.....