Macintosh 128K/512K Troubleshooting: Revision history

27 September 2026

• curprev 12:4012:40, 27 September 2026 Josh talk contribs 31,302 bytes −16 House rule: reword in-article correction narratives so they describe the claim in circulation and what the source says, rather than the page's own edit history. The corrections themselves are recorded in the edit summaries undo
• curprev 11:3311:33, 27 September 2026 Josh talk contribs 31,318 bytes −921 Verify against Apple's Macintosh 128K/512K Service Source (hosted): DELETED the fabricated component-level tables - a two-VIA table with designators U6D and U4D on a machine with ONE 6522, a '64KB ROM set (4 chips)' when the board takes two 32 KB devices, a PAL function table, a 74F244/245/258 buffer-location table, crystal load capacitor values, and the analogue-board feedback designators (optocoupler U3, SCR Q10, C24/C29 2200uF, CR20/CR21, Q3) which come from the DIFFERENT Macintosh Plus bo... undo

25 September 2026

• curprev 08:0108:01, 25 September 2026 Josh talk contribs 32,239 bytes +511 cite Apple's Service Source and Service Guide Volume 1 (P4 orphan fix) undo

16 July 2026

• curprev 13:0713:07, 16 July 2026 Josh talk contribs 31,728 bytes +107 Add representative photo (Wikimedia Commons, attributed on file page) undo

25 May 2025

• curprev 09:1109:11, 25 May 2025 Josh talk contribs 31,621 bytes +25,977 No edit summary undo

12 May 2025

• curprev 08:4608:46, 12 May 2025 Josh talk contribs 5,644 bytes −14 No edit summary undo Tag: Visual edit
• curprev 08:0908:09, 12 May 2025 Josh talk contribs 5,658 bytes −5 No edit summary undo
• curprev 08:0908:09, 12 May 2025 Josh talk contribs 5,663 bytes −58 No edit summary undo

19 April 2025

• curprev 13:1613:16, 19 April 2025 Josh talk contribs 5,721 bytes +350 No edit summary undo
• curprev 13:1613:16, 19 April 2025 Josh talk contribs 5,371 bytes +44 →🔌 No Power (Unit Dead or Ticking) undo

8 April 2025

• curprev 23:2923:29, 8 April 2025 Josh talk contribs 5,327 bytes +31 →📺 CRT or Video Artifacts undo Tag: Visual edit

4 April 2025

• curprev 17:5517:55, 4 April 2025 Josh talk contribs 5,296 bytes −955 No edit summary undo

18 March 2025

• curprev 22:5022:50, 18 March 2025 Josh talk contribs 6,251 bytes +42 No edit summary undo Tag: Visual edit
• curprev 20:4320:43, 18 March 2025 Josh talk contribs 6,209 bytes +2 No edit summary undo Tag: Visual edit
• curprev 20:4220:42, 18 March 2025 Josh talk contribs 6,207 bytes −69 No edit summary undo Tag: Visual edit
• curprev 20:3920:39, 18 March 2025 Josh talk contribs 6,276 bytes +6,276 Created page with "Comprehensive troubleshooting is crucial for diagnosing and resolving issues with your Macintosh 128K and 512K. Below is an extensive guide covering common problems and detailed solutions, presented in an easy-to-follow format. == No Power (Unit Dead or Ticking) == {| class="wikitable" style="width:100%;" |- ! Symptom !! Possible Cause !! Recommended Action |- | No signs of life (no chime, no CRT glow) || Blown fuse, failed power supply, PRAM battery leakage || Check a..."