Black Dragon Repair Logs

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Repairer: Arcade King
Forum Thread: Black Dragon PCB Repair

Brad's Original Black Dragon (Tiger) PCB

PCB was missing 2 roms a 27512 @ 9B and 27256 @ 2N

The rom at 2N is for all the in game foreground text and 9B is part of the background.

First things first replaced the 2 missing roms.

Problem: Foreground text is all messed up.

Pcb repair black dragon 1.jpg

Fix: Pin 23 (A11) on rom 2N was stuck High. Tracked back to pin 2 of a 74ls253 @ 3N. Replacing the chip fixed the problem.

Problem: Character Graphics have faint horizontal lines through them.

Pcb repair black dragon 2.jpg

Fix: Faulty 74ls253 @ 2K. Both chips were TI (Texas Instruments) branded IC's

Pcb repair black dragon 3.jpg

Board now 100%

Repair Logs converted to wiki format by Brad from Aussie Arcade.