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Apple service tools and diagnostics

From RetroTechCollection
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The "Special Tools Index" page of Apple's 1990 Apple Service Guide for Macintosh Computers, with the Apple part number of each tool

Apple service tools and diagnostics are the special tools and test software Apple specified for servicing 68000-series Macintoshes: the long Torx driver and pull-apart tool for the compact Macs, the CRT discharge tool, chip and SIMM extractors, loopback plugs, and the MacTest, MacTest Pro and Apple Personal Diagnostics programs. Apple's 1990 pocket service guide gives the part numbers of the special tools on one page.[1] General workshop tools are on Recommended Tools; the CRT procedure is on CRT Discharge Procedure.

Apple's special tools

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Special tools in the 1990 Apple Service Guide[1]
Tool Apple part number Used for
Torx driver 076-8053 Case screws of the compact Macintoshes
Pull-apart tool 076-8059 Prising the rear housing off a compact Macintosh
CRT discharge tool 076-0381 Discharging the CRT of a compact Macintosh or any Macintosh monitor
SIMM removal tool 076-8354 Removing SIMMs, for example in the Macintosh Plus memory upgrade
IWM/SWIM IC extraction tool 076-0341 Pulling the IWM chip in the Macintosh II FDHD SuperDrive upgrade
DB9 serial port plug (set of 2) 077-8129 Loopbacks for MacTest on the 128K and 512K
SCSI loopback test card 077-8219 SCSI test in MacTest on the Macintosh Plus

The uses are those given in the guide's procedures and in Apple's 1987 Technical Procedures for the Macintosh and Macintosh Plus.[1][2]

Torx drivers

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Apple's take-apart procedure for the Macintosh and Macintosh Plus lists a "15-inch Torx screwdriver" among the materials needed to remove the back cover.[2] The case screws are Torx (Apple part 435-5002 for the Plus) and sit at the bottom of deep holes, so the shaft must be long. The size is T15; iFixit's answer for the SE and SE/30 recommends an extra-long T15 driver.[2][3]

The PowerBooks use smaller sizes. Apple's own list gives the drivers and Apple part numbers that service providers could supply:[4]

PowerBook screwdrivers[4]
Machines Drivers
PowerBook 100 Torx #8 and #10
PowerBook Duo 200 series and 2300 Torx #8, plus Torx #6 or Phillips for the floppy mechanism
PowerBook 500 series Torx #6 and #8
PowerBook 5300 series Torx #8
PowerBook 1400 series Metric Phillips 00 and 01

Apple's part numbers are 077-0064 for the Torx #6, 077-0677 for the #8 and 077-0676 for the #10.[4] The PowerBook 500 Series Service Source says all nine screw types in those machines are Torx and need a T-8 or T-6 driver,[5] and the 190/5300 Service Source adds a #6 Torx for the floppy drive, a #10 for the hard drive bracket and jeweller's screwdrivers of 2.3 mm and #00.[6]

Pull-apart tool

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The pull-apart tool (076-8059) is a spreader for prising the rear housing of a compact Macintosh away from the front bezel.[1][7] Apple's later Service Sources call it a case cracker.[8] Apple's procedure for the Macintosh and Macintosh Plus:[2]

  1. Switch off and unplug the computer, and disconnect the keyboard, mouse and other cables.
  2. Prise off the reset/interrupt switch, if fitted, with a small flat-blade screwdriver, and remove the battery compartment cover.
  3. Lay the computer face down on a soft cloth or foam pad.
  4. Remove the case screws with the Torx driver. Apple's 1987 procedure lists five for the Macintosh and Plus, one of them inside the battery compartment; the 128K/512K Service Source counts four.[2][7][9]
  5. Work the pull-apart tool into the seam and prise the cover loose, then lift it straight up; the picture tube inside is fragile.
  6. Take off any grounding wriststrap before discharging the CRT.

Collectors have used other tools for the same job. The JagWerks SE/30 page describes a "Pony 3201" spring clamp as a substitute, and a third-party "Mac opener kit" from APS that held a long Torx driver, a pull-apart tool and a grounding wrist strap.[10]

CRT discharge tool

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Apple's CRT discharge tool 076-0381 is the one listed in the 1990 guide, for compact Macintoshes and Macintosh monitors.[1] The JagWerks page describes an older Apple tool, 076-0243, with a built-in 100 MΩ resistor intended for the 128K, 512K and Plus, and says 076-0381 has no resistor.[10] The procedure, and why a wrist strap must not be worn, is on CRT Discharge Procedure.

Static protection

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Apple's service guides tell technicians to work on a grounded conductive mat and wear a grounding wriststrap when handling boards, chips and SIMMs. Apple's list of materials for an ESD-safe workstation is a conductive workbench mat with a ground cord, a wriststrap with a built-in 1 MΩ resistor and its ground cord, an equipment ground cord with alligator clips, and a ground/polarity tester for checking the outlet.[1] The same guides set the limits: do not be grounded when working on plugged-in equipment, when discharging a CRT, or when working on an unplugged CRT that has not been discharged. The 1987 procedures say the straps and mats contain a one-megohm resistor and are meant only for "dead" equipment.[1][2] Apple named no product of its own for the strap or mat in these documents; see Recommended Tools for the resistor requirement in the current ESD standard.

Diagnostic software

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MacTest

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MacTest was Apple's service diagnostic diskette for the 128K, 512K and Plus. It is a pass/fail test that reports module failures of the logic board, keyboard, keypad and disk drives. Apple's instructions:[2]

  • Make a backup copy of the MacTest diskette first, with one of the two copy programs on it, because a defective machine can damage the diskette. Write-protect the original.
  • Fit the loopbacks for a complete test: two DB-9 serial port plugs on the Macintosh 128K and 512K; on the Plus, a DIN-8 to DIN-8 cable between the serial ports and the SCSI loopback test card.
  • Have a blank formatted 400K diskette ready for the external drive test.
  • Always use the most recent revision of MacTest.

If the diskette will not boot, check the power and internal cables, then work through the troubleshooting tables, swapping modules and retrying the boot after each one.[2] The 1990 guide's troubleshooting flowcharts call for MacTest in the same way.[1] Startup error codes are on Sad Mac Error Codes.

MacTest Pro

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MacTest Pro was Apple's later service diagnostic. Apple describes it as repair diagnostic software for logic boards, video cards, monitors, floppy drives, hard drives and CD-ROM drives, which also detects corrupted software and multiple System Folders on a volume. It was a subscription product for Apple service providers, updated with each new CPU, with test modules the technician could customise.[11][12] In February 1996 the 68K release was MacTest Pro 7.0 on two disks, with MTP Emergency boot disks in an 800K version (System 6.0.8) and a 1.4 MB version, and a MacTest Pro CD. The 1.4 MB emergency disks carry System 7.5 and the enablers for the machines they test.[13]

Apple Personal Diagnostics

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Apple Personal Diagnostics (order number M2800LL/B) was the end-user product. It tests the logic board, RAM, hard and floppy drives and monitors, checks for damaged System, Finder and Enabler files, repairs minor disk directory damage and runs benchmarks. It came on one 800K application disk with two emergency startup disks, and needs a Macintosh Plus or later with 2 MB of RAM and System 6.0.7 or later (System 7 for the automatic background tests).[14] Version 1.0 did not support Power Macintoshes. The last version, 1.1.3, covers over 140 models from the Plus to the Power Macintosh 9500/132, except the 7200, 7500 and 8500.[15] Apple's service department recommended MacTest Pro over it for technicians, because Personal Diagnostics has no CPU-specific tests and does not test modems, CD-ROM drives or NuBus cards.[11]

TechStep and the serial test console

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Apple's hand-held TechStep tester ran ROM-based tests through a machine's external ports. Its manual is hosted as Apple TechStep User Guide, and the ROM test interface it used is described on Diagnostic Serial Console.

Disk utilities

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The Disk Tools disk that came with System 7.0 and 7.0.1 holds Disk First Aid, which detects and repairs problems on a hard disk, and Apple HD SC Setup, which initialises Apple hard disks and updates their drivers. Apple's advice was not to use HD SC Setup on a disk formatted with third-party software.[16] Later versions of both, and Drive Setup, are on the archived Apple server described on Apple Macintosh system software.

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References

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  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Apple Computer, Apple Service Guide for Macintosh Computers, 1990. Hosted as File:APPLE MACINTOSH SERVICE GUIDE VOL1 1990.pdf; see Apple Macintosh Service Guide Volume 1 1990. Safety: CRT discharge, p. 3 (PDF p. 8); ESD prevention rules and ESD-safe workstation, pp. 5-6 (PDF pp. 10-11). Tab 1, Macintosh Plus memory upgrade, p. 15 (PDF p. 25). Tab 4, Macintosh II FDHD SuperDrive upgrade, p. 15 (PDF p. 79). Tab 6, Special Tools Index, p. 31 (PDF p. 125).
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Apple Computer, Apple Technical Procedures: Macintosh and Macintosh Plus, sections revised February 1987. Hosted as File:Apple Technical Procedures Macintosh and Macintosh Plus 1987.pdf; see Apple Technical Procedures: Macintosh and Macintosh Plus. Safety rules on grounding straps and mats (PDF p. 6); ESD prevention, Take-Apart 2.1-2.3 (PDF pp. 19-21); Cover, materials required and procedure (PDF p. 22); MacTest, Diagnostics 3.1 onwards (PDF pp. 36-45); case screw 435-5002 in the parts list (PDF p. 94).
  3. ↑ iFixit Answers, "Tool kit for Macintosh SE", 14 April 2017 (retrieved 2026-10-04). Community answer: an extra-long Torx T15 for the two screws in the handle well; comments from a former Apple-trained technician on the Apple tool kit and spreader.
  4. ↑ 4.0 4.1 4.2 Apple Computer, Tech Info Library article 17471, "PowerBook: Sizes and Suppliers for Torx Drivers (1/97)", savagetaylor.com mirror (retrieved 2026-10-04).
  5. ↑ Apple Computer, PowerBook 500 Series Service Source, Basics, PowerBook Screw Matrix, p. 7 (PDF p. 9). Hosted as File:PowerBook 500 Series Service Source.pdf.
  6. ↑ Apple Computer, PowerBook 190 and 5300 Series Service Source, Take Apart, Before You Begin, Tools (PDF p. 74). Hosted as File:PowerBook 190 and 5300 Series Service Source.pdf.
  7. ↑ 7.0 7.1 Apple Computer, Macintosh Plus Service Source, Take Apart, Cover. Hosted as File:Macintosh_Plus.pdf; see Macintosh Plus Service Source.
  8. ↑ Apple Computer, Macintosh LC 580/Performa 580CD Service Source, Take Apart, Rear Housing, p. 16 (PDF p. 62). Hosted as File:Lc_580.performa_580cd.pdf.
  9. ↑ Apple Computer, Macintosh (128K/512K) Service Source, Take Apart, Cover, step 3. Hosted as File:Macintosh 128k.512k.pdf; see Macintosh 128K/512K Service Source.
  10. ↑ 10.0 10.1 JagWerks Media, "Classic Mac Repair Resources", section I.2 "Take apart SE/30" and I.4 "Discharge Tool" (retrieved 2026-10-04). Community page: long Torx T-15 screwdriver, pull-apart tool alternatives, Apple CRT discharge tools 076-0381 and 076-0243.
  11. ↑ 11.0 11.1 Apple Computer, Tech Info Library article 14415, "Apple Personal Diagnostics and MacTest Pro Compared (8/94)", created 11 January 1994, savagetaylor.com mirror (retrieved 2026-10-04).
  12. ↑ Apple Computer, Tech Info Library article 13165, "MacTest Pro: Description (3/94)", savagetaylor.com mirror (retrieved 2026-10-04).
  13. ↑ Apple Computer, Tech Info Library, "MacTest Pro: 68k Macintosh Computers Version Info", effective 21 February 1996, savagetaylor.com mirror (retrieved 2026-10-04).
  14. ↑ Apple Computer, Tech Info Library article 14376, "Apple Personal Diagnostics: Description and Specs (2/95)", savagetaylor.com mirror (retrieved 2026-10-04).
  15. ↑ Apple Computer, Tech Info Library article 18396, "Apple Personal Diagnostics: Which Models Supported", savagetaylor.com mirror (retrieved 2026-10-04).
  16. ↑ Apple Computer, Tech Info Library article 14033, "System 7.0 or 7.0.1: Installation Requirements", savagetaylor.com mirror (retrieved 2026-10-04).


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