Difference between revisions of "PCB Repair Logs Black Dragon"
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<td class="" style=""> | <td class="" style="">[http://wiki.aussiearcade.com.au/index.php/File:Jamma_pinout.png Jamma Pinout]</td> | ||
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Revision as of 13:39, 4 February 2013
Black Dragon
| 200px | |
| PCB Image | Reserved |
|---|---|
| Pin Out | Jamma Pinout |
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.
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.
Fix: Faulty 74ls253 @ 2K. Both chips were TI (Texas Instruments) branded IC's
Board now 100%
