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Macintosh SE/30 Troubleshooting
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== "Simasimac" โ Horizontal Stripe Pattern == [[File:Simasimac issue.jpg|thumb|Macintosh SE/30 Simasimac pattern]] The infamous "Simasimac" pattern shows horizontal black-and-white lines with no startup chime. Causes include: * Leaking capacitors disrupting the reset circuit * Corroded traces or vias near RAM/ROM '''Solutions:''' * Clean and reseat ROM and RAM SIMMs * Replace PRAM battery if < 3V * Check for reset pulse at CPU * Test for 16 MHz clock at CPU * Inspect Apple Sound Chip ('''ASC''') at UB11 and filter RP2 * Use multimeter or oscilloscope to confirm continuity
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