Macintosh SE/30 Troubleshooting: Revision history

23 September 2026

• curprev 00:2200:22, 23 September 2026 Josh talk contribs 20,802 bytes +183 Cite the SE/30 schematic as the now-hosted internal file rather than a GitHub URL; link the new schematic documentation page undo
• curprev 00:1700:17, 23 September 2026 Josh talk contribs 20,619 bytes +8,009 Verification drive: the page called a single HORIZONTAL line "horizontal collapse" and blamed C15/R19 - those are horizontal-sweep parts and produce a single VERTICAL line; the page contradicted itself on this two sections later. Corrected and sourced to Pina. CPU clock corrected 16 MHz -> 15.667 MHz (Apple). R22 moved to its real symptom. "Egret" removed - the SE/30 ADB transceiver is UL11, Egret is a later machine. J12 pinout verified pin by pin against Apple drawing 050-0253-01 and publish... undo

21 September 2026

• curprev 21:5221:52, 21 September 2026 Josh talk contribs 12,610 bytes +20 Verification drive: flag unverified component data pending check against a primary source undo

3 July 2026

• curprev 16:5516:55, 3 July 2026 Josh talk contribs 12,590 bytes +1,285 →Video Display Issues undo Tag: Visual edit

15 June 2025

• curprev 17:0317:03, 15 June 2025 Josh talk contribs 11,305 bytes +245 →Preliminary Checks and Power Supply Basics undo Tag: Visual edit

8 June 2025

• curprev 00:2500:25, 8 June 2025 Josh talk contribs 11,060 bytes +84 →Related Pages undo Tag: Visual edit
• curprev 00:2400:24, 8 June 2025 Josh talk contribs 10,976 bytes +1,107 No edit summary undo Tag: Visual edit
• curprev 00:2200:22, 8 June 2025 Josh talk contribs 9,869 bytes +713 No edit summary undo Tag: Visual edit
• curprev 00:1400:14, 8 June 2025 Josh talk contribs 9,156 bytes +5,356 →"Simasimac" – Horizontal Stripe Pattern undo Tag: Visual edit

12 May 2025

• curprev 08:5608:56, 12 May 2025 Josh talk contribs 3,800 bytes −88 No edit summary undo Tag: Visual edit

4 April 2025

• curprev 17:5117:51, 4 April 2025 Josh talk contribs 3,888 bytes −1,283 No edit summary undo

29 March 2025

• curprev 18:2318:23, 29 March 2025 Josh talk contribs 5,171 bytes +80 No edit summary undo Tag: Visual edit: Switched
• curprev 18:2218:22, 29 March 2025 Josh talk contribs 5,091 bytes +132 No edit summary undo Tag: Visual edit
• curprev 18:1818:18, 29 March 2025 Josh talk contribs 4,959 bytes +222 →Chimes of Death and Sad Mac Codes undo Tag: Visual edit
• curprev 17:4817:48, 29 March 2025 Josh talk contribs 4,737 bytes +4,737 Created page with "=== Preliminary Checks and Power Supply Basics === Begin troubleshooting by confirming the analog board provides correct voltages: ideally, +5 V DC (within 4.90–5.10 V) and +12 V DC at drive connectors. If the SE/30 appears completely dead (no fan, CRT glow, or startup chime), inspect analog power components, including fuses, rectifiers CR2 and CR3, transistor Q2, and resistor R22. Verify no external peripherals or expansion cards are causing boot issues. Ensure reset..."