NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. > Channelmaniac's Arcadecomponents' Old School Repair Logs

Capcom - Older Boards (Pre CPS 1)

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channelmaniac:
Model: 1943:
Symptom: Garbled player/enemy sprites

Problem would come and go with tapping/flexing of the board set. Flipped set over and isolated the problem down (by light tapping) to a custom surface mount chip on the ROM board. A closer inspection revealed 3 pins on the chip that were barely soldered at the factory. The connection broke loose resulting in the corruption. Repaired 3 bad solder connections on surface mount chip to fix the game.

channelmaniac:
Model: Super Buster Bros
Symptom: Dead. Solid white screen

This board uses the Kabuki CPU, a modified Z80 with a decode table kept in internal RAM. If the battery dies, the board will suicide.

Revived the board by removing R33 and jumpering the right side pad from R33 to ground to make the Kabuki act like a standard Z80. Replaced the ROMs at 11H, 13H, and 14H with ones programmed with suicide free code. Jumpered pin 30 on each 27C020 and pin 1 on the 27C512 replacement ROMs to pin 27 of the Kabuki CPU to finish the repair.

Suicide free code and instructions are both available off the Dead Battery Society website.

channelmaniac:
Model: Super Pang
Symptom: Dead. Solid white screen

Like Super Buster Bros., this board uses the Kabuki CPU, a modified Z80 with a decode table kept in internal RAM. If the battery dies, the board will suicide.

Revived the board by removing R33 and jumpering the right side pad from R33 to ground to make the Kabuki act like a standard Z80. Replaced the ROMs at 11H, 13H, and 14H with ones programmed with suicide free code. Jumpered pin 30 on each 27C020 and pin 1 on the 27C512 replacement ROMs to pin 27 of the Kabuki CPU. Removed the battery to finish the repair.

Suicide free code and instructions are both available off the Dead Battery Society website.

channelmaniac:
Model: Super Buster Bros
Symptom: Dead

This game had the same problem of a dead suicide battery. It needed new ROMs programmed and a slight reconfiguration to make the Kabuki CPU act like a normal Z80.

On these games, the first thing to test is the NiCD battery. If it's low then the game will have suicided. There's no way to reprogram the codes into the Kabuki so using the "Phoenix" code and board modifications listed at the Dead Battery Society website is the only way to bring these pre-CPS1 suicided games back to life.

Be sure to remove the battery to keep it from leaking on the board. Many of these old batteries will have started leaking. This is evidenced by a blue or blue-green crystalline growth on the ends of the battery. In bad cases it will creep along the traces and corrode them and any components it comes into contact with.

channelmaniac:
Model: Super Buster Bros
Symptom: Dead - Suicided

Removed 1 resistor and jumpered one pin to ground on the Kabuki CPU. Programmed 2 2Mb EPROMs and 1 512K EPROM with Phoenixed code. Jumpered pin 1 of the 512K EPROM to pin 30 on both 2Mb EPROMs and to pin 27 of the Kabuki CPU. Tested board.

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