Nintendo Famicom Troubleshooting Guide: Difference between revisions
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''Note: Disk System (FDS) and external accessories are '''not''' covered here.'' | ''Note: Disk System (FDS) and external accessories are '''not''' covered here.'' | ||
== | == Diagnostic Tools & Techniques == | ||
=== Visual Inspection === | === Visual Inspection === | ||
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* ROMs (PRG/CHR) – game data (test with known-good cartridge first) | * ROMs (PRG/CHR) – game data (test with known-good cartridge first) | ||
== | == Common Symptoms & Solutions == | ||
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== | == Notes on Board Revisions == | ||
* Early HVC-CPU boards use discrete VRAM (e.g. 2114, 6116); later models may use different RAM types or have minor layout changes. | * Early HVC-CPU boards use discrete VRAM (e.g. 2114, 6116); later models may use different RAM types or have minor layout changes. | ||
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* PAL Famicom (rare) uses 2A07 CPU and 2C07 PPU; most faults and procedures are similar, but clock and video signals differ. | * PAL Famicom (rare) uses 2A07 CPU and 2C07 PPU; most faults and procedures are similar, but clock and video signals differ. | ||
== | == Key Test Points == | ||
* '''+5 V DC''': Cartridge slot pin 14, CPU/PPU/RAM Vcc pins | * '''+5 V DC''': Cartridge slot pin 14, CPU/PPU/RAM Vcc pins | ||