There are several versions of the Commodore 1541 disk drive. Some are covered by the technical manual, other schematics were scanned from later documents. There is even a reverse engineered diagram of the 1541-II drive.


Commodore 1540/1541 Service Manual in HTML format.
1540/1541 technical manual. Schematics and other information for drives up to 1541 B.


1541-II-powersupply.gif@ 2002-09-22 66389
Reverse-engineered schematic diagram of the 110-volt 1581 and 1541-II power supply. Created and uploaded by William Levak <wlevak@cyberspace.org>. According to him, you have to break the case open to get inside. Jameco sells a case that can be used to replace it.
1541-II.340503.gif 1996-10-31 190045
1541-II schematic diagram, by Commodore. According to the 1571 Service Manual, the Gate Array (251828 or 64H156) has some different revisions (-01, -02 and -03). Revisions -01 and -03 have only 40 pins, but -02 has 42 pins. Frank Kontros (jeno@kontr.uzhgorod.ua) reports that the (chinese) 1541-II boards he has seen only carry the assy no. 340503, although there are some differences. Also, his boards have the latest (-03) Gate Array, with some wiring on the pin 21 (OSC).
1541-II.gif 1997-01-17 112882
1541-II.readme 1997-01-17 1286
1541-II schematic diagram. Drawn and uploaded by Levente Hársfalvi (Levente@Mi.Stud.PMMFK.JPTE.HU).
boards.txt 1999-12-02 1334
Information about different 1541 board versions, composed by William Levak.
parts.txt 2002-12-05 2000
1540/1541/1541A/1541B/SX-64 drive parts list, composed by William Levak.
pla.txt 1999-12-02 2883
1541/1571 40/42 Pin Gate Arrays, composed by William Levak.
short-251748-rev.E-left.gif 1996-05-08 202102
short-251748-rev.E-right.gif 1996-05-08 191735
Short board 1541, assy no. 251748, rev.E, sheet 3 of 4. On this board, a 40-pin custom chip replaces some 74xx logic.

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