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IBM Hardware Maintenance Service (March 1986)

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The Hardware Maintenance Service manual, IBM part number 6280087, Revised Edition (March 1986), is IBM's service manual for the IBM Personal Computer (5150), Personal Computer XT (5160), Portable Personal Computer (5155) and Personal Computer AT (5170). It replaced the machine-by-machine service manuals with one manual in two parts: system-specific sections for each machine, and a common set of numbered diagnostic maintenance analysis procedures (MAPs). The four sections listed below are hosted as PDFs. Minuszerodegrees.net, which supplied them, has the whole manual section by section.[1]

The preface describes the structure: for each system, "Start" (the entry point for all diagnostic procedures), "Jumpers and switch settings" and "Parts catalog", followed by the diagnostic MAPs. Removal and replacement procedures are not in this manual; IBM put them in the companion Hardware Maintenance Reference. The manual expects a Triplett Model 310 multimeter or equivalent.[2] Minuszerodegrees records that the manual was supplied with Advanced Diagnostics version 2.20 and Advanced Diagnostics for the AT version 2.03, and that its copy incorporates the Model 339 supplement for the last AT model (document 6280139, March 18, 1986).[1]

Contents

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  • Start
  • PC, XT, Portable PC: MAP 0000 Start, jumpers and switch settings, switch supplements, parts catalogue, parts supplements
  • AT: MAP 0000 Start, jumpers and switch settings, switch supplements, parts catalogue, parts supplements
  • Diagnostic MAPs: 0020 Power, 0100 System board, 0200 Memory, 0300 Keyboard, 0400 Monochrome Display and Printer Adapter, 0500 Color Graphics Monitor Adapter, 0600 Diskette drive, 0700 Math coprocessor, 0900 to 1300 parallel, serial and game ports, 1400 Graphics Printer, 1500 SDLC adapter, 1700 Fixed disk, 1800 Expansion unit, 2000 to 2200 BSC and cluster adapters, 2400 Enhanced Graphics Adapter, 2900 Color Printer, 3000 and 3100 PC Network, 3300 Compact Printer, 3600 GPIB adapter, 3800 Data Acquisition and Control adapter, 3900 Professional Graphics Adapter, 7100 Voice Communications adapter[1]

Sections hosted here

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Hosted sections of 6280087
File PDF pages Contents
Parts (PC, XT, Portable PC) 56 FRU part numbers for the 5150, 5160 and 5155: system unit exterior (Assemblies 1 to 3, pp. 7 to 9) and interior (Assemblies 4 to 6; 5150 interior pp. 10-11, with the two system boards, both power supplies and the miscellaneous parts kit), full-height diskette drive types 1, 2 and 3 (Assemblies 7 to 12, pp. 16 to 27, each with its drive belt), the Portable PC drive, fixed disk, internal options and adapters (p. 30), the 5161 Expansion Unit (pp. 33 to 35), the 5151, 5153, 5154 and 5175 displays, the 83-key keyboards and keybuttons (pp. 44 to 49), power cords and miscellaneous parts
Parts (AT) 34 FRU part numbers for the 5170, pages dated March 18, 1986: system unit exterior (Assembly 1, p. 7) and interior (Assembly 2, pp. 8-9: system boards type 1 256KB-512KB 6480170, type 2 512KB 6480072 and type 3 512KB 6489922; battery 8286121; power supply 8286122; power supply load resistor 8286123), 5.25-inch diskette drives (p. 10), fixed disk drives (p. 11), internal options and adapters (pp. 12-13), displays, the 84-key and 101/102-key keyboards (pp. 22 to 29), power cords and miscellaneous parts
MAP 0000: Start (AT) 18 The AT entry procedure: checks before starting, including the 115/230 V selector switch and the Setup program (p. 0000-1); the Advanced Diagnostics sequence; the table of POST errors and beep patterns with the MAP each leads to (p. 0000-13); other failure symptoms (p. 0000-14)
MAP 0020: Power 22 Power (PC) for the 5150, 5160 and 5155: device and adapter isolation, Power Good, system board and drive connector voltage limits (p. 0020-3), speaker continuity, minimum system board resistances (p. 0020-9), expansion unit. Power (AT) for the 5170: voltage selector check, Power Good at P8, system board and drive connector limits with the load resistor note (p. 0020-3), drive, adapter and coprocessor isolation

What this manual does not contain

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  • No schematics, component values or capacitor lists. Every MAP ends at a replaceable unit: a power supply, a system board, an adapter, a drive.
  • No removal and replacement procedures; those are in the Hardware Maintenance Reference.[2]
  • The Advanced Diagnostics diskettes are not part of the scan.
  • The other MAPs and the jumper and switch sections are on minuszerodegrees.net only.[1]

What it settles

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  • IBM's 1986 supply limits for the PC and XT (MAP 0020 Power (PC), p. 0020-3) and the AT (MAP 0020 Power (AT), p. 0020-3), and the minimum system board resistances for the PC and XT (p. 0020-9).
  • That an AT with no fixed disk needs the power supply load resistor, FRU 8286123, on P10 or P11 (MAP 0020, p. 0020-3; Parts (AT), p. 9).
  • The FRU part numbers for the 5150 and 5170 power supplies, system boards, AT battery and drive belts.

Pages that cite this document

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MAP 0000, Start (AT):

Parts (AT):

Parts (PC, XT, Portable PC):

Downloads:

References

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  1. ↑ 1.0 1.1 1.2 1.3 IBM Hardware Maintenance Service, manual part number 6280087, minuszerodegrees.net. Lists the sections, the Advanced Diagnostics versions supplied with the manual and the incorporated AT Model 339 supplement.
  2. ↑ 2.0 2.1 IBM, Hardware Maintenance Service, 6280087, Revised Edition (March 1986), front matter: safety inspection guide (pp. iii to v), "How to Use this Maintenance Library" (p. vi) and preface (p. vii).
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