Difference between revisions of "PCB Repair Logs Lethal Enforcers"
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<td colspan="2" class="" style="text-align:center;">[[Image:marquee_lethal_enforcers.jpg|200px]]</td> | <td colspan="2" class="" style="text-align:center;">[[Image:marquee_lethal_enforcers.jpg|200px]]</td> | ||
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<th scope="row" style="text-align:left; white-space: nowrap;">Manufacturer</th> | |||
<td class="" style="">[[PCB_Manufacturers_Konami|Konami]]</td> | |||
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<th scope="row" style="text-align:left; white-space: nowrap;">Year</th> | |||
<td class="" style="">1992</td> | |||
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<th scope="row" style="text-align:left; white-space: nowrap;">Pin Out</th> | <th scope="row" style="text-align:left; white-space: nowrap;">Pin Out</th> | ||
<td class="" style=""> | <td class="" style="">[[PCB_Pinouts_Jamma|Jamma]]</td> | ||
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'''Repairer:''' [http://www.aussiearcade.com.au/member.php/1-Arcade-King Arcade King]<br> | '''Repairer:''' [http://www.aussiearcade.com.au/member.php/1-Arcade-King Arcade King]<br> | ||
'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/ | '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/19950-Lethal-Enforcers Lethal Enforcers PCB Repair]<br> | ||
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Got this PCB in the freebie shooter cab. | Got this PCB in the freebie shooter cab. | ||
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[[ | [[File:Pcb repair 74ls138 F Chip.jpg|300px|]] | ||
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Latest revision as of 11:58, 6 February 2013
Lethal Enforcers
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| Manufacturer | Konami |
|---|---|
| Year | 1992 |
| PCB Image | Reserved |
| Pin Out | Jamma |
Repairer: Arcade King
Forum Thread: Lethal Enforcers PCB Repair
Got this PCB in the freebie shooter cab.
As always first thing I look for on any PCB im about to repair is the F branded Fujitsu logic chips. This brand is the devil! 95% of the problems on pcbs I've repaired over the years are due to these. Doesn't even matter what type of Fujitsu logic either, they are all dying.
Problem: Board constantly resetting, won't boot.
Fix: Dead 74ls138 @ J2 (F chip )
Problem: Games running but has graphics corruption and vertical lines through the graphics.
Fix: Very common problem I'm finding on any board with Mask roms. Doing a mask rom test revealed a bad rom @ V8. Put a 42 pin socket in and replaced it with another mask rom I had on a parts LE board. The equivalent EPROM for LE is 27C800 8 meg 16 bit rom.
Problem: Colours messed up.
Fix: Dead outputs on 74ls151's @ J8 and J10. Seen this issue before and the other pcb I looked at was loaded with all F branded 151's . I expect the rest of the 151's will die on this board soon enough.
Problem: Player 1 trigger not working.
Fix: Using the schematics I traced the problem back to a bad 74ls253 @ M3 (F chip)<Bbr>
Anyway game fixed, interesting that this game uses an 8 bit processor.
