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PowerBook 140 Documentation
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== Daughterboard schematic, 050-0410 == ''Schematic, Daughter Board, Mac PowerBook'', Apple Computer drawing 050-0410, revision 01 (engineering release), 11 sheets, scanned as 11 PDF pages without a text layer. Sheet 1 shows the RAM expansion connector J1, the interconnect connector J2 to the top-case interconnect board, and the stacking connector J3 to the motherboard; the ROMs are U6 and U7. The drawing does not say which of the three daughterboards (661-0707 for the 140, 661-0788 for the 145, 661-0709 for the 170) it shows. Download: [[:File:PowerBook 140 daughterboard schematic (050-0410).pdf|PowerBook 140 daughterboard schematic (050-0410).pdf]] Both schematics were found on bitsavers (pdf/apple/mac/powerbook/140/) and are byte-identical to the copies on MacDat. Owners cite them in repair threads on 68kMLA.<ref>68kMLA forum threads [https://68kmla.org/bb/threads/powerbook-145-shuts-down-during-startup.45699/ "PowerBook 145 shuts down during startup"] (desertrout, November 2023: "for 140, but 145 is the same for the most part") and [https://68kmla.org/bb/threads/powerbook-140-issues-no-bootup-chime-display-corruption.44153/ "PowerBook 140 issues; no bootup chime, display corruption"] (Dogmander, April 2023: ROMs U6 and U7).</ref>
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