Zimmers.NET Files (formerly ftp.funet.fi)


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.


1540-1541_Disk_Drive_Service_Manual_314002-01_(1985_Nov).pdf 2015-06-22 793022

1540-1541_Disk_Drive_Service_Manual_Preliminary_314002-01_(1985_Apr).pdf 2015-06-22 3944978

1540-1541_Service_Manual_Preliminary_314002-01_(1985_Jan).pdf 2015-06-22 2815192

1541-II-powersupply.gif 2009-08-18 66389
Reverse-engineered schematic diagram of the 110-volt 1581 and 1541-II
power supply. Created and uploaded by William Levak <wlevak@sdf.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 2009-08-18 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 2009-08-18 112882
1541-II.readme 1997-01-17 1286
1541-II schematic diagram. Drawn and uploaded by
Levente Hársfalvi (Levente@Mi.Stud.PMMFK.JPTE.HU).

1541-II_Service_Manual_Addendum_314862-01_(1988_Mar).pdf 2015-06-22 557750

boards.txt 1999-12-02 1334
Information about different 1541 board versions, composed by William Levak.
Commodore_Diskette_Diagnostic_Manual_Version_2_PN_3140451-01.pdf 2015-06-22 2297312

parts.txt 2015-07-08 2200
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.

Transit_card_251171-02_(300_dpi).pdf 2015-06-22 927756
Transit_card_251171-03_(300_dpi).pdf 2015-06-22 928514
Transit card images for buffering head vibration during movement

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