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'''IBM Mobile Systems Hardware Maintenance Manual, Volume 1: Laptop, Notebook, Portable and ThinkPad Computers''', form number '''S82G-1501-01''', part number '''30H2356''', '''Second Edition (May 1995)'''. 503 pages.
The '''IBM Mobile Systems Hardware Maintenance Manual, Volume 1: Laptop, Notebook, Portable and ThinkPad Computers''' is IBM's 503-page service manual for its early portables, form number S82G-1501-01, part number 30H2356, Second Edition (May 1995). It replaced the earlier ''IBM Laptop, Notebook, and Portable Computers Vol. 1'' (82G1501).


This is the first of the four-volume Mobile Systems set and the one that covers IBM's '''pre-ThinkPad''' portables alongside the earliest ThinkPads. Its title page lists: '''Laptop L40SX (8543)''', '''Laptop CL57 (8554)''', '''Notebook N45SL (2614)''', '''Notebook N51XX (8551)''', '''Portable P70/P75 (8573)''', '''ThinkPad 300 (2615)''', '''350 (2618)''', '''500 (2603)''', '''510 (2604)''', '''710T (2523)''', the '''Expansion Unit (3550)''' and '''Dock Station I (3545)''' and '''II (3546)'''.
The title page lists the machines it supports: the Laptop L40 SX (8543), Laptop CL57 SX (8554), Notebook N45SL (2614), Notebook N51 SX/SLC (8551), Portable P70/P75 (8573), ThinkPad 300 (2615), ThinkPad 350 and PS/Note 425 (2618), ThinkPad 500 (2603), ThinkPad 510 (2604), ThinkPad 710T (2523), the Expansion Unit (3550) and Dock Stations I (3545) and II (3546). The later ThinkPads (340, 355, 360, 370, 700, 701, 720, 750, 755) are in Volume 2.


== What it contains ==
== Contents ==


IBM's ThinkPad hardware maintenance manuals all follow the same plan, and knowing it saves hunting:
The Introduction (pp. 1-20) applies to the whole volume. It has a table of every portable by type-model with processor, memory and disk (pp. 2-3), the FRU replacement strategy (p. 4), the hard disk replacement strategy and how to read POST error messages (p. 5), the diskette drive compatibility matrix (p. 6), multilingual safety notices (p. 7), safety information including the safety inspection guide and ESD handling (pp. 14-18), and a screw size chart that identifies each screw by letter and colour (pp. 19-20).


* '''About this manual''' and '''Introduction''' — the '''strategy for replacing FRUs''' (reinstall the original part if the replacement does not fix the fault; if a machine has both a processor board and a system board, put the first one back before trying the second; remove multi-FRU assemblies one part at a time), how to use error messages, and the diskette compatibility matrix.
Each machine then has its own section in the same order: General Checkout, Symptom-to-FRU Index, Related Service Procedures, Product Overview, FRU Removals and Replacements, Locations and Parts Listing.
* '''Safety information''' — general and electrical safety, the safety inspection guide, ESD handling, grounding requirements and the laser compliance statement, with the safety notices repeated in every supported language.
* '''General descriptions''' and '''Related service information''' — restoring the preloaded system, '''passwords''' (including what can and cannot be cleared), and '''power management'''.
* '''Checkout guide''' — testing the computer, detecting system information with PC-Doctor, and the '''power system checkout''': checking the AC adapter, operational charging, the main battery pack and the '''backup battery''', each with its own measurement.
* '''Product overview''' — specifications, status indicators, FRU tests and the Fn key combinations.
* '''Symptom-to-FRU index''' — numeric error codes, error messages, beep symptoms, '''LCD-related symptoms''', intermittent problems and undetermined problems.
* '''FRU replacement notices''' — the '''screw notices''' (torque and thread-lock rules, which matter on magnesium frames) and retaining serial numbers.
* '''Removing and replacing a FRU''' — the numbered 10xx sequence, which must be followed in order because later steps assume earlier ones.
* '''Locations''' — front, rear and bottom views by machine type.
* '''Parts list''' — FRU part numbers, including the keyboard and LCD part numbers by country and panel supplier.


In this volume the per-machine sections follow the older IBM pamphlet order — General Checkout, Symptom-to-FRU Index, Related Service Procedures, Product Overview, FRU Removals and Replacements, Locations, Parts Listing — and each machine gets a complete set.
{| class="wikitable"
! Section !! Starts on page
|-
| Model L40 SX (8543) || 23
|-
| Model N45SL (2614) || 47
|-
| Model N51 (8551) || 73
|-
| Model CL57 (8554) || 111
|-
| Model P70 and P75 (8573) || 145
|-
| ThinkPad 300 (2615) || 183
|-
| ThinkPad 350, PS/Note 425 (2618) || 205
|-
| ThinkPad 500 (2603) || 231
|-
| ThinkPad 510 (2604) || 257
|-
| ThinkPad 710T (2523) || 285
|-
| Expansion Unit (3550) || 315
|-
| Dock I (3545) || 339
|-
| Dock II (3546) || 389
|-
| Common Devices Checkout (external diskette drive, display, keyboard, fax/modem, printer, port replicator, TrackPoint II, TV tuner) || 463
|-
| Common Parts Listing || 477
|-
| Miscellaneous Information (acronyms, problem determination tips, US and Canada phone numbers) || 483
|-
| Notices || 489
|}


The introduction also carries the '''portable computer descriptions''', the '''drive and diskette compatibility matrix''' and a '''screw size chart''', which apply across the whole volume.
The front matter lists the separate Hardware Maintenance Reference and Service pamphlets for each of these machines, with part and form numbers, and the reference and diagnostic diskettes (pp. iv-v).


== What it does not contain ==
== What this manual does not contain ==


'''Module level, and firmly so.''' These manuals name FRU part numbers, not component values. Across a typical ThinkPad maintenance manual the word "capacitor" appears '''once''', in the ESD handling note. There is '''no schematic, no board layout, no parts list below FRU level and no component data of any kind'''. A system board is one line item with one part number.
The manual works at FRU level. The parts listings give IBM part numbers for boards, drives, covers, cables and screws, and a system board is a single part. There are no schematics and no component values; the only capacitor mentioned is the "bulging capacitor" hazard in the safety inspection guide. The diagnostic diskettes it refers to are not part of the scan.


That is IBM's service model, not a gap in the scan, and it is why no ThinkPad on this wiki has a component-level capacitor list. If you need a board-level repair on a ThinkPad, this manual will tell you which board and how to get it out; it will not tell you what is on it.
== What it settles ==


== What it settles ==
The power system checkouts give measured limits. For the L40 SX (pp. 29-31): AC adapter output +14.3 to +15.8 V dc; rechargeable battery +8.5 to +12.6 V dc, with 4 to 30 kΩ between the thermistor terminal and ground; backup battery +2.8 to +3.2 V dc; standby battery +3.0 to +4.5 V dc after a 48-hour charge. For the P70 and P75 (p. 149), which run from mains, the supply limits are +4.8 to +5.2 V and +11.5 to +12.6 V.
 
The FRU replacement strategy (p. 4) is IBM's own rule for all of these machines: if a replacement FRU does not cure the fault, refit the original before going on; where a machine has both a processor board and a system board, put the first board back before trying the other; and where an adapter is made of several FRUs, remove them one at a time and replace only the one that changes the symptom.


'''This is where the PS/2 P70 and P75 (8573) are serviced as mobile machines.''' The [[IBM PS2 Model P70 386 Hardware Maintenance Reference|P70 386 HMR]] and [[IBM PS2 Model P70 386 Hardware Maintenance Service|HMS]] pamphlets cover the same hardware from the PS/2 side; this volume is the later and fuller treatment. The same applies to the '''N45 SL (2614)''', which also has its own pamphlet as [[IBM PS2 N45 SL Hardware Maintenance Reference]].
The P70 386 and P75 486 also have their own pamphlets, listed in this volume's related publications: the [[IBM PS2 Model P70 386 Hardware Maintenance Reference|P70 386 HMR]] (64F3994) and [[IBM PS2 Model P70 386 Hardware Maintenance Service|HMS]] (15F2198), and for the P75 the HMR 84F8525 and HMS 84F7593. The N45SL has [[IBM PS2 N45 SL Hardware Maintenance Reference]] (42G0485).


<pdf> File:IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf </pdf>
<pdf> File:IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf </pdf>


Download it here: [[:File:IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf|IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf]]
Download: [[:File:IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf|IBM Mobile Systems Hardware Maintenance Manual Volume 1.pdf]]


== Related pages ==
== Related pages ==


* [[IBM ThinkPad HMM Volume 2 (340/355/360/370/700/701/720/750/755)]] &middot; [[IBM ThinkPad HMM Volume 3 (365C/CD/CS/CSD)]] &middot; [[IBM ThinkPad HMM Volume 4 (380/385/560/560E/760)]]
* [[IBM ThinkPad HMM Volume 2 (340/355/360/370/700/701/720/750/755)]]
* [[IBM PS2 N45 SL Hardware Maintenance Reference]] &middot; [[IBM PS2 Model P70 386 Hardware Maintenance Reference]] &middot; [[IBM PS2 Model P75 486 Quick Reference]]
* [[IBM ThinkPad HMM Volume 3 (365C/CD/CS/CSD)]]
* [[IBM ThinkPad Notebooks - Personal Systems Reference]] &middot; [[IBM ThinkPad Notebooks (A/G/R/T/X) - Personal Systems Reference]] &mdash; for identifying a machine from its type-model number
* [[IBM ThinkPad HMM Volume 4 (380/385/560/560E/760)]]
* [[IBM PS2 Model P75 486 Quick Reference]]
* [[IBM ThinkPad Notebooks - Personal Systems Reference]] and [[IBM ThinkPad Notebooks (A/G/R/T/X) - Personal Systems Reference]], for identifying a machine from its type-model number


[[Category:IBM Service Manuals]]
[[Category:IBM Service Manuals]]
[[Category:Service Manuals]]
[[Category:Service Manuals]]
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