Tims Retro Corner | Commodore 1571 Disk Drive Repair Part 2 @TimsRetroCorner | Uploaded March 2022 | Updated October 2024, 7 hours ago.
In which I descend further into the miasma that is "51 Overflow In Record" error, and try once more to fix my 1571 disk drive.

Resources:
Ray Carlsen's diagnostics site: portcommodore.com/rcarlsen/cbm/1571
Zimmers.Net technical service manuals and schematics: zimmers.net/anonftp/pub/cbm/schematics/drives/new/1571/index.html
Sams 1571 Computerfacts Guide: datassette.nyc3.cdn.digitaloceanspaces.com/tech/sams_computerfacts_1571.pdf

00:00 - Introduction
00:34 - Revisiting the problem
02:11 - Chips and Solutions…
06:40 - SAMS Troubleshooting Guide
07:51 - 51 Overflow In Record
09:01 - Troubleshooting the read circuit
11:15 - A week later… still doesn’t work!
15:14 - Schematics
17:15 - Same Diagnostic; Different Result
21:16 - Desoldering
23:30 - A test with chips in sockets
24:49 - WD1772 Replacement

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