3x Super Pac-Man PCB Repair - Easy 1-2-3? Yep, Sort of, Nope - FPGA CAT Box
Автор: Jacklick’s Arcade and Tech Repair Journey
Загружено: 2022-09-03
Просмотров: 683
Описание:
@delsarcade asked if I would take a look at these 3 Super Pac-Man boards so I do my best to get them working.
Summary:
Ram Speed at 2D Matters (300ns or faster)
CPU Rev. D Boards have 47pf filter cap at 3F-7,8 for line noise suppression
Bad / Flaky Sockets totally mess up your troubleshooting
Frozen at test screen? Check dip switch and related resistor network
00:00 Intro
01:00 PCB #1 Symptom (RAM 7)
02:40 PCB #1 Fixed / Testing
06:00 PCB #2 Symptom (Coin / Input Issues)
07:00 Figure out Cocktail (Table) Mode
10:00 PCB #2 Symptom Demo
11:00 Troubleshoot inputs
12:35 Sound Sidetrack
14:25 New Clue?
15:40 RAM at 2D
18:50 Sidetracked on Sound Again
20:24 RAM Access Time Matters
21:55 Back2Sound, PCB diff
27:24 PCB #3 Overview
29:45 RAM 5/6 (3k & 3L) Errors
30:35 3K & 3L Enable incorrect?
35:10 Progress w/ Main CPU to RAM
37:00 New Symptom Stuck Test Screen
39:25 FPGA Catbox more RAM errors
44:20 New Error ROM 3 Bad Socket
50:00 Logic Probe too slow (rabbit hole)
55:48 Back to Stuck Test Screen
1:00:07 Wrap-Up Test
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