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Macintosh II/IIx/IIfx Service Source

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The Macintosh II/IIx/IIfx Service Source is Apple's 87-page service manual for the Macintosh II, Macintosh IIx and Macintosh IIfx. The PDF was produced on 1 December 1995. Like other Service Source volumes it works at module level: specifications, symptom charts, take-apart and upgrade procedures, and module part numbers, with no schematics or component values. Page numbers below are the PDF's.

Specifications as printed

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Specifications (pp. 5-12)
Item Macintosh II Macintosh IIx Macintosh IIfx
CPU 68020, 15.6772 MHz, optional PMMU 68030, 15.6772 MHz, built-in PMMU 68030, 40 MHz, built-in PMMU
Coprocessor 68881 68882 68882
RAM 1 MB, expandable to 8 MB 1 MB, expandable to 8 MB 4 MB, expandable to 8 MB
ROM 256K 256K 512K
Floppy 800K; optional second 800K; optional 1.4 MB upgrade 1.4 MB; optional second 1.4 MB
Hard drive Optional internal 40, 80 or 160 MB
I/O SCSI 5 MB/s, eight devices maximum; two ADB; two RS-232/RS-422 serial (mini DIN-8); six NuBus slots; processor-direct slot listed under Expansion
Sound Apple sound chip, 8-bit stereo sampling at 44.1 kHz, four-voice wavetable synthesis
Power 100-240 V AC auto-configured, 48-62 Hz, 220 W maximum excluding monitor 230 W maximum excluding monitor
Size and weight 5.5 × 18.7 × 14.4 in (14.0 × 47.4 × 36.5 cm); 24 lb (10.9 kg) without hard drive

Contents

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  • Basics: Overview (p. 3)
  • Specifications: Processor, Memory, Disk Storage, I/O Interfaces, Sound and Video, Electrical, Physical (pp. 5-12)
  • Troubleshooting: General (p. 14); symptom charts for Error Chord, System, Video, Floppy Drive, Hard Drive, Peripherals and Miscellaneous (pp. 15-31)
  • Take Apart: Cover (p. 33), Power Supply (p. 36), Floppy Drive (p. 38), Hard Drive (p. 40), Drive Mount (p. 44), Hard Drive Data Cable (p. 47), Logic Board (p. 49)
  • Upgrades: Mac IIx Logic Board Upgrade (p. 54), Mac IIfx Logic Board Upgrade (p. 56), PMMU Upgrade for Macintosh II (p. 58), 1.4 MB Floppy Drive Upgrade for Macintosh II (p. 61)
  • Additional Procedures: Battery Verification (p. 69), Battery Replacement (p. 71), Battery Holder Board (p. 74), Macintosh IIfx SCSI Termination (p. 80)
  • Exploded View (p. 87)

What it settles

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  • Batteries: two lithium cells on the logic board; replace any that reads below 3.2 V on the 10 V DC range (p. 70). A Macintosh II or IIx with soldered batteries gets a battery holder board before new cells are fitted: cut the old leads, desolder with an iron of 50 W or less, and fit the holder with its positive side in the holes marked positive (pp. 74-79).
  • NEC SIMMs: Apple-labelled SIMMs made by NEC with a date code of 9052 or earlier cause the error chord, failure to boot, ghosting or lost video, hangs and ID errors; Apple's cure is to replace them (pp. 15-31).
  • Thermal shutdown: with blocked vents the thermal protection circuit shuts the system down; it recovers after 30-40 minutes (p. 17).
  • PMMU upgrade for the Macintosh II: prise out the HMMU and fit a PMMU in the same socket, dot to dot (pp. 58-60).
  • 1.4 MB floppy upgrade for the Macintosh II: replace the four ROMs with 342-0639 (HI, C13), 342-0640 (MED HI, C12), 342-0641 (MED LO, E13) and 342-0642 (LO, E12), replace the IWM with a SWIM, and use system software 6.0.2 or later. Apple notes the kit is no longer available and that a IIx or IIfx logic board is the alternative (pp. 61-67).
  • IIfx SCSI termination: external chains end in one SCSI Cable Terminator II, never more than one; an internal SCSI filter supplies termination capacitance for third-party drives and Apple drives shipped before 19 March 1990; a IIfx shipped without a hard drive has a termination block and filter on the logic board connector, and the filter moves to the drive when one is fitted (pp. 80-85).
  • Exploded-view part numbers: logic boards 661-0528 (II), 661-0529 (IIx), 661-0522 (IIfx); power supply 661-0375 (II, IIx), 661-0542 (IIfx); floppy drives 661-0345 (800K) and 661-0474 (1.4 MB); 40 MB hard drive 661-0216 (p. 87).

What this manual does not contain

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No schematic, no component values and no parts list below module level. There are no power-supply voltages, tolerances or adjustments, and no per-slot NuBus power figures.

Pages that cite this document

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Download: Macintosh_ii.iix.iifx.pdf (605 KB)

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