IBM THINKPAD 365E, THINKPAD 365ED Service Manual

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IBM Mobile				Systems	S82G-1503-05
Hardware		Maintenance		Manual
Volume	3:	ThinkPad		Computers
March	1997
We	Want	Your	Comments!
(Please		see	page	611)

This Manual Supports:
ThinkPad 365C/CD	(2625)
ThinkPad 365CS/CSD	(2625)
ThinkPad 365X/XD	(2625)
ThinkPad 380	(2635)
ThinkPad 385	(2635)
ThinkPad 560	(2640)
ThinkPad 760C/CD	(9546)
ThinkPad 760E/ED	(9546)
ThinkPad 760L/LD	(9546)
ThinkPad 760EL/ELD	(9547)
ThinkPad 760XL	(9546)
ThinkPad 760XD	(9547)
SelectaDock	(3547)

IBM Mobile				Systems	S82G-1503-05
Hardware		Maintenance		Manual
Volume	3:	ThinkPad		Computers
March	1997
We	Want	Your	Comments!
(Please		see	page	611)

IBM

Note

Before using this information and the product it supports, be sure to read the general information under “Notices” on page 616.


Sixth	Edition	(March		1997)
The	following	paragraph		does	not	apply	to	the	United
Kingdom or any country where						such provisions			are
inconsistent		with local law:				INTERNATIONAL
BUSINESS MACHINES CORPORATION PROVIDES THIS
PUBLICATION “AS IS” WITHOUT WARRANTY										OF ANY
KIND, EITHER			EXPRESS		OR	IMPLIED,		INCLUDING, BUT
NOT	LIMITED		TO,	THE	IMPLIED		WARRANTIES			OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE. Some states do not allow disclaimer of express or implied warranties in certain transactions,

therefore, this statement may		not apply	to you.
This publication could include technical inaccuracies or
typographical	errors. Changes are periodically made to
the information	herein; these	changes will	be incorporated

in new editions of the publication. IBM may make improvements and/or changes in the product(s) and/or the


program(s)	described in			this	publication at any			time.
This publication was developed for products and services
offered in the United States						of America. IBM		may	not offer
the products, services, or features discussed in this
document	in other		countries,		and	the	information	is	subject
to change without notice. Consult your local IBM
representative		for	information		on	the	products,	services,
and features		available		in your		area.

Requests for technical information about IBM products should be made to your IBM reseller or IBM marketing representative.

Copyright International Business Machines
Corporation 1997. All	rights	reserved.
Note to U.S. Government users–Documentation related to
Restricted rights–Use, duplication,			or disclosure is subject
to restrictions	set	forth in GSA ADP	Schedule Contract
with IBM Corp.

ii IBM Mobile Systems - ThinkPad HMM Volume 3

About	This Manual
This	manual	contains	service and	reference	information for
IBM ThinkPad 365, 380, 385, 560, 760, and SelectaDock
products. Use this manual along with the					advanced
diagnostic		tests to	troubleshoot	problems	effectively.

The manual is divided into sections as follows:

ŸThe Introduction section provides general information, guidelines, and safety information required to service computers.

ŸThe product-specific sections include service,

reference, and product-specific parts information.

ŸThe Common Devices Checkout section provides

procedures for testing the devices that are commonly

attached to ThinkPad computers.

ŸThe Miscellaneous Information section contains

information about	acronyms, abbreviations, terms,
and a telephone	number listing.

Important

This manual is intended for trained servicers who are familiar with ThinkPad products. Use this manual

along with the advanced diagnostic tests to troubleshoot problems effectively.

Before servicing an IBM		mobile product, be sure to
review the	safety information under “Safety Notices
(Multi-lingual	Translations)”	on page 8 and “Safety
Information” on page 15.

iii

Related Publications

The following mobile product publications are available through IBM or your IBM Authorized Dealer.

Publication

Part, Form

Number

Mobile

Systems

HMM

30H2356,

S82G-1501-01

Volume

1: Laptop,

Notebook,

Portable,

and

ThinkPad

Computers

(Models

L40,

CL57,

N45,

N51,

P70/P75,

ThinkPad

300,

350,

500,

510,

710T,

Expansion

Unit,

Dock

II)

Mobile

Systems

HMM

30H2357,

S82G-1502-03

Volume

2: ThinkPad

Computers

(Model

340,

355,

360, 370,

700,

701,

720,

750,

755)

ThinkPad

700

(9552)

HMS

42G2016,

S42G-2016

ThinkPad

700

(9552)

HMR

42G2015,

S42G-2015

ThinkPad

700C

(9552)

HMS

42G2022,

S42G-2022

ThinkPad

700C

(9552)

HMR

42G2021,

S42G-2021

ThinkPad

720/720C

(9552)

61G1193,

S61G-1193

HMS

ThinkPad

720/720C

(9552)

61G1187,

S61G-1187

HMR

ThinkPad

730T

(2524)

HMM

82G5497,

S82G-5497

ThinkPad

Exp.

Crtg.

(3550)

42G2338,

S42G-2338

HMS

ThinkPad

Exp.

Crtg.

(3550)

42G2339,

S42G-2339

HMR

PS/2

FaxConcentrator

HMS

15F2262,

S15F-2262

PS/2

FaxConcentrator

HMR

84F8541,

S84F-8541

PS/2

Comm.

Cartridge

10G5993,

S10G-5993

HMS

PS/2

Comm.

Cartridge

10G5992,

S10G-5992

HMR

IBM High Speed Internal,61G1556, S61G-1556

PCMCIA

Data/Fax

Modems

iv IBM Mobile Systems - ThinkPad HMM Volume 3

Diskettes

The

following

diskettes

are

available through IBM or your

IBM

Authorized

Dealer.

Diskette

Part, Form

Number

ThinkPad

300

(2615)

33G9361,

S33G-9361

Advanced

Diagnostics

Diskette

ThinkPad

350,

350C,

425,

A211000,

GA21-1000

425C (2618)

Advanced

Diagnostics

Diskette

ThinkPad

365

(2625)

76H7578,

S30H-2498

Advanced

Diagnostics

Diskette

ThinkPad

500

(2603)

71G3702,

S71G-3702

Advanced

Diagnostics

Diskette

ThinkPad

510

(2604)

83G8095,

S83G-8095

Advanced

Diagnostics

Diskette

ThinkPad

700

(9552)

42G2017,

S42G-2017

Reference

Diskette

ThinkPad

700C

(9552)

42G2023,

S42G-2023

Reference

Diskette

ThinkPad

720/720C

(9552)

61G1194,

S61G-1194

Reference

Diskette

ThinkPad

Hardware

78H5384,

S78H-5384

Maintenance

Diskette

(for

all Models

355, 360,

560,

750,

755,

760)

ThinkPad

Dock

(3545)

71G4140,

S71G-4140

Docking

Station

(3550)

42G2428,

S42G-2428

Data/Fax

Modem

61G1556,

S61G-1556

FaxConcentrator/A

84F8540,

S84F-8540

vi IBM Mobile Systems - ThinkPad HMM Volume 3

Contents

Introduction				. . . . . . . . . .								. .		.	. . .	. . .	1
Portable		Computer				Descriptions. . . . . . . . . .							2
Drive	and		Diskette				Compatibility. .Matrix. . . . .					5
Important			Service			Information. . . . . . . . . . .							6
Safety Notices (Multi-lingual										Translations). . . . .		8
Safety Information							. . . . . . . .					. . . . . . . . 15
Laser	Compliance				Statement . . . . . . . . . . .								20
Screw	Size Chart. . . . . . . . . . . . . . . . .													22
ThinkPad 365		(2625)					. . . . . . . .					. . . . . . 25
Read	This		First. . . . . . . . . . . . . . . . . .											27
General Checkout . . . . . . . . .												. . . . . . . . 30
Symptom-to-FRU Index							. . . . . . . .					. . . . . . 41
Related		Service				Procedures. . . . . . . . . . .						.	50
Diagnostic			Test		Programs. . . . . . . . . . . .							.	52
Using	the		Diagnostics					Test		Programs. . . . . . .		54
Product		Overview				(365C,		CD,	CS, CSD). . . . . .			58
Product Overview						(365E, ED) . . . . . .						. . . . . 59
FRU	Removals			and		Replacements. . . . . . . . .						60
Locations . . . . . . . . . . .												. . . . . . . . . . 81
Parts	Listing			365C,			CD,	CS,	CSD	(2625). . . . .	84
Parts	Listing			365E,			ED (2625). . . . . . . . . . .						87
ThinkPad	365X,		365XD	(2625)					. . . . . . . . . .			91
Read	This		First. . . . . . . . . . . . . . . . . .											93
Checkout Guide						. . . . . . . . .						.	. . . . . . . 96
Symptom-to-FRU Index							. . . . . . . .					. . . . . 106
Related		Service				Procedures. . . . . . . . . . .						117
Product Overview						(365X, 365XD)				. . . . .		.	.	.	126
FRU	Removals			and		Replacements. . . . . . . .						127
Locations . . . . . . . . . . .												. . . . . . . . . 164
Parts	Listing			365X,			365XD (2625). . . . . . . .					170
ThinkPad	380,	380D,		385,		385D (2635)				. . . . .	183
Read	This		First. . . . . . . . . . . . . . . . .											185
Checkout Guide						. . . . . . . . .						. . . . . . . 189
Symptom-to-FRU Index							. . . . . . . .					. . . . . 199
Related		Service				Procedures. . . . . . . . . . .						210
Product		Overview				(380,		380D,		385, 385D). . . .	215
FRU	Removals			and		Replacements. . . . . . . .						216
Locations . . . . . . . . . . .												. . . . . . . . . 249
Parts	Listing			380/385 (2635). . . . . . . . . .								252
ThinkPad 560		(2640)					. . . . . . . .					. . . . . 263
Read	This		First. . . . . . . . . . . . . . . . .											265
Checkout Guide						. . . . . . . . .						. . . . . . . 268
Symptom-to-FRU Index							. . . . . . . .					. . . . . 279
Related		Service				Procedures. . . . . . . . . . .						291
Product Overview						(560) . . . . . . . .							.	.	. . .	296
FRU	Removals			and		Replacements. . . . . . . .						297
Locations . . . . . . . . . . .												.	.	.	. . .	. . .	321
Copyright				IBM		Corp.		1997		vii


Parts		Listing				560		(2640). . . . . . . . . . . .						.	325
ThinkPad 760			(9546, 9547)									. . . . . .		. . . . 335
Read		This			First. . . . . . . . . . . . . . . . .										338
Checkout Guide								. . . . . . . . .						. . . . . . . 341
Symptom-to-FRU Index										. . . . . . . .				. . . . . 359
Related				Service				Procedures. . . . . . . . . . .						372
Product Overview								(760) . . . . . . .						. . . . . . 377
FRU		Removals				and		Replacements. . . . . . . .						382
LCD	Removal				and		Replacement. . . . . . . . .							427
LCD	Unit,			12.1				SVGA (P/N 29H9226, ASM P/N
29H9029) . . . . . . . . . . .														.	. . . .	.	.	.	428
LCD	Unit,			12.1				SVGA (P/N 29H9226, ASM P/N
73H6599) . . . . . . . . . . .														. . . . . . . . 433
LCD	Unit,			10.4			SVGA		(P/N			29H9227). . . . . .		439
LCD	Unit,			10.4			VGA		(P/N		46H5355). . . . . . .			444
LCD	Unit,			11.3				DSTN	(P/N			39H6232). . . . . .		449
LCD	Unit,			12.1				XGA. . . . . . . . . . . . . .							454
LCD	Unit,			12.1				SVGA		(P/N		82H8496). . . . . .		460
LCD Unit, 12.1 SVGA (P/N 11J8867, ASM P/N
11J8855)					. . . . . . . . . . . . . . . .												. .	.	466
LCD	Unit,			12.1				SVGA (P/N 46H5725, ASM P/N
46H5723) . . . . . . . . . . .														. . . . . . . . 472
Locations . . . . . . . . . . .														. . . . . . . . . 478
Parts		Listing				760	(9546,			9547). . . . . . . . .				483
LCD	Parts			List . . . . . . . . . . . . . . . . .											520
ThinkPad		SelectaDock			Docking			System				. . . .	547
Read		This			First. . . . . . . . . . . . . . . . .										548
General Preparation . . . . . . . .														.	. . . .	.	.	550
Checkout Guide								. . . . . . . . .						.	. . . . . . 551
Printer				. . . . . . . . . . .										.	. . . .	. . . . . 554
Running Diagnostics									. . . . . . . .					.	. . . .	.	559
Symptom-to-FRU Index										. . . . . . . .				.	. . . .	565
Undetermined Problems . . . . . . .														. . . . . . 573
FRU		Removals				and		Replacements. . . . . . . .						574
Locations . . . . . . . . . . .														. . . . . . . . . 583
Parts		Listing				SelectaDock					(3547). . . . . . . .			588
Common	Devices			Checkout							. . . . . . . . . .			591
External			Diskette					Drive .Test. . . . . . . . . .						592
External			Display					Self-Test. . . . . . . . . . . .							592
External Keyboard/Auxiliary Input Device Checkout															593
Fax/Modem Checkout . . . . . . . . . . . . . .																	594
Printer Checkout								. . . . . . . . .						. . . . . . . 596
Port		Replicator						Checkout. . . . . . . . . . . .							597
TrackPoint Checkout								. . . . . . . .						.	. . . . .		598
TV Tuner . . . . . . . . . . .														.	. . . .	.	.	.	. 599
Common	Parts			Listing					. . . . . . . . . . . .					.	605
Miscellaneous Information											. . . . . . .			. . . . 609
Acronyms,				Abbreviations						and		Terms. . . . . . .		609
Send		Us		Your		Comments!. . . . . . . . . . . .									611
viii		IBM		Mobile				Systems			-	ThinkPad HMM Volume	3

Do You Need		Technical		References?. . . . . .	612
Problem	Determination		Tips. . . . . . . . . . .		613
Phone	Numbers,	U.S.	and	Canada. . . . . . . .	614
Notices . . . . . . . . . . .					. . . . . . . . . . 616

Contents ix

x IBM Mobile Systems - ThinkPad HMM Volume 3

Introduction

Portable Computer			Descriptions. . . . . . . . . .				2
Drive	and	Diskette		Compatibility. .Matrix. . . . .		5
Important		Service Information. . . . . . . . . . .					6
How	to	Use	Error Messages. . . . . . . . . .				7
How	to	Read	POST	Error	Messages. . . . . .	7
Safety Notices (Multi-lingual					Translations). . . . .	8
Safety Information				. . . . . . . . .			. . . . . . . 15
General Safety				. . . . . . . . .			. . . . . . . 15
Electrical Safety				. . . . . . . . .			. . . . . . . 16
Safety		Inspection		Guide. . . . . . . . . . . .			17
Handling Electrostatic Discharge-Sensitive Devices							19
Grounding Requirements . . . . . . . .							. . . . 19
Laser	Compliance		Statement . . . . . . . . . . .				20
Screw	Size Chart. . . . . . . . . . . . . . . . . 22

Portable Computer Descriptions

Models N51, CL57, and P70/75 and Thinkpads 700x and

720x are Micro Channel systems. All others are AT/ISA bus systems.

Model				Type	Processor		Memory	Hrd Dsk
Model	L40SX			8543-044		386SX-20		2M/18M	60M
Model	N45		SL	2614-065		386SL-25		2M/8M	80M
				2614-067 386SL-25				2M/8M	120M
Model	N51		SLC	8551-025		386SLC-16		2M/10M	80M
Model	N51		SX	8551-033		386SX-16		2M/10M	40M
Model	CL57		SX	8554-045		386SX-20		2M/16M	80M
Model	P70		386	8573-031		80386-16		2M/8M	30M
				8573-061 80386-20				2M/8M	60M
				8573-121 80386-20				2M/8M	120M
Model	P75		486	8573-161		80486-33		8M/16M	160M
				8573-401 80486-33				8M/16M	400M
ThinkPad		300		2615-065		386SL-25		4M/12M	80M
				2615-067 386SL-25				4M/12M	120M
ThinkPad		340		2610		486SLC2-50/25		4M/12M	125M
ThinkPad		340CSE		2610		486SLC2-50/25		4M/12M	200M
ThinkPad		340CSE		2610		486SLC2-66/33		4M/12M	360M
ThinkPad		345		2610		486DX4-75		4M/20M	360M
ThinkPad		345CS		2610		DX4-75		4M/20M	540M
ThinkPad		350		2618-AOE		486SL-25		4M/20M	85M
				2618-JOA 486SL-25				4M/20M	125M
				2618-LOA 486SL-25				4M/20M	250M
ThinkPad		350C		2618-NOA		486SL-25		4M/20M	125M
				2618-POA 486SL-25				4M/20M	250M
ThinkPad		355		2619		486SX-33		4M/16M	125M
ThinkPad		355C		2619		486SX-33		4M/16M	125M
				2619		486SX-33		4M/16M	250M
ThinkPad		355Cs		2619		486SX-33		2M/16M	170M
				2619		486SX-33		2M/16M	250M
ThinkPad		360		2620		486SX-33		4M/16M	170M
				2620		486SX-33		4M/16M	340M
ThinkPad		360C		2620		486SX-33		4M/16M	170M
				2620		486SX-33		4M/16M	340M
ThinkPad		360Cs		2620		486SX-33		4M/16M	170M
				2620		486SX-33		4M/16M	340M
ThinkPad		360Ce		2620		486DX2-50/25		4M/16M	170M
				2620		486DX2-50/25		4M/16M	340M
				2620		486DX2-50/25		4M/16M	540M
ThinkPad		360Cse		2620		486DX2-50/25		4M/16M	170M
				2620		486DX2-50/25		4M/16M	340M
				2620		486DX2-50/25		4M/16M	540M
ThinkPad		360P		2620		486SX-33		4M/16M	170M
				2620		486SX-33		4M/16M	340M
ThinkPad		365C		2625-205		486DX4-75		8M/24M	340M
				2625-x05 486DX4-75				8M/24M	540M
ThinkPad		365E		2625		5x86-100/33		8M/24M	540M
ThinkPad		365ED		2625		5x86-100/33		8M/24M	540M
ThinkPad		365X/XD		2625		Pentium-100		8M/24M	540M
				2625		Pentium-100		8M/24M	810M
				2625		Pentium-100		8M/24M	1.0G
ThinkPad		365X/XD		2625		Pentium-120		8M/24M	540M
				2625		Pentium-120		8M/24M	810M
				2625		Pentium-120		8M/24M	1.0G
ThinkPad		365X/XD		2625		Pentium-133		8M/40M	810M
				2625		Pentium-133		8M/40M	1.0G
				2625		Pentium-133		8M/40M	1.3G
ThinkPad		370C		9545		486DX4-75/25		4M/32M	340M
				9545		486DX4-75/25		4M/32M	540M
				9545		486DX4-75/33		4M/32M	810M
C			Color			T		Tablet
M			Megabyte			TPF		ThinkPad File
P			Pen

2 IBM Mobile Systems - ThinkPad HMM Volume 3

Model		Type	Processor		Memory	Hrd Dsk
ThinkPad	380	2635		Pentium-150		16M/48M	1.08G
		2635		Pentium-150		16M/48M	1.35G
		2635		Pentium-150		16M/48M	2.10G
ThinkPad	385	2635		Pentium-150		16M/48M	1.08G
		2635		Pentium-150		16M/48M	1.35G
		2635		Pentium-150		16M/48M	2.10G
ThinkPad	500	2603-081		486SLC2-50/25		4M/12M	80M
		2603-171 486SLC2-50/25				4M/12M	170M
ThinkPad	560	2640		Pentium-100		8M/40M	540M
		2640		Pentium-100		8M/40M	810M
		2640		Pentium-100		8M/40M	1.0G
ThinkPad	560	2640		Pentium-120		8M/40M	540M
		2640		Pentium-120		8M/40M	810M
		2640		Pentium-120		8M/40M	1.0G
ThinkPad	560	2640		Pentium-130		8M/40M	540M
		2640		Pentium-130		8M/40M	810M
		2640		Pentium-130		8M/40M	1.0G
ThinkPad	700	9552-300		486SLC-25		4M/16M	80M
		9552-301 486SLC-25				4M/16M	120M
ThinkPad	700C	9552-30B		486SLC-25		4M/16M	120M
ThinkPad	701C	2630		486DX2-25/50		4M/32M	360MB
		2630		486DX2-25/50		4M/32M	540MB
		2630		486DX4-25/75		8M/32M	360MB
		2630		486DX4-25/75		8M/32M	540MB
ThinkPad	701Cs	2630		486DX2-25/50		4M/32M	360MB
		2630		486DX2-25/50		4M/32M	540MB
		2630		486DX4-25/75		8M/32M	360MB
		2630		486DX4-25/75		8M/32M	540MB
ThinkPad	710T	2523-09Y 486SLC2-25				4M/12M	TPF
		2523-302 486SLC2-25				4M/12M	60M
		2523-303 486SLC2-25				4M/12M	60M
ThinkPad	720	9552-307		486SLC-25/50		4M/16M	120M
		9552-308 486SLC-25/50				4M/16M	160M
ThinkPad	720C	9552-30J		486SLC-25/50		4M/16M	160M
ThinkPad	730T	2524		486SLC2-25		4M/12M	0M
		2524		486SLC2-25		4M/12M	60M
ThinkPad	750	9545-006		486SL-33		4M/20M	170M
		9545-008 486SL-33				4M/20M	340M
ThinkPad	750C	9545-306		486SL-33		4M/20M	170M
		9545-308 486SL-33				4M/20M	340M
ThinkPad	750Ce	9545		P24S-50/25		4M/20M	340M
ThinkPad	750Cs	9545		486SL-33		4M/20M	170M
		9545		486SL-33		4M/20M	340M
ThinkPad	750P	9545-40C		486SL-33		4M/20M	170M
		9545-40E 486SL-33				4M/20M	340M
ThinkPad	755C	9545		486DX4-50/25		4M/32M	170M
		9545		486DX4-50/25		4M/32M	340M
		9545		486DX4-50/25		4M/32M	540M
		9545		486DX4-75/25		4M/32M	170M
		9545		486DX4-75/25		4M/32M	340M
		9545		486DX4-75/25		4M/32M	540M
ThinkPad	755CD	9545		486DX4-100/33		8M/32M	540M
		9545		486DX4-100/33		8M/32M	810M
ThinkPad	755CDV	9545		486DX4-100/33		8M/32M	540M
		9545		486DX4-100/33		8M/32M	810M
ThinkPad	755Ce	9545		486DX4-100/33		8M/32M	340M
		9545		486DX4-100/33		8M/32M	540M
		9545		486DX4-100/33		8M/32M	810M
ThinkPad	755Cs	9545		486DX4-50/25		8M/32M	170M
		9545		486DX4-50/25		8M/32M	340M
		9545		486DX4-50/25		8M/32M	540M
		9545		486DX4-75/25		8M/32M	170M
		9545		486DX4-75/25		8M/32M	340M
		9545		486DX4-75/25		8M/32M	540M
ThinkPad	755Cse	9545		486DX4-100/33		8M/32M	340M
		9545		486DX4-100/33		8M/32M	540M
		9545		486DX4-100/33		8M/32M	810M
C	Color			T		Tablet
M	Megabyte			TPF		ThinkPad File
P	Pen

Introduction3

Model		Type	Processor	Memory	Hrd Dsk
ThinkPad	755CV	9545	486DX4-100/33		8M/32M	540M
		9545	486DX4-100/33		8M/32M	810M
ThinkPad	755CV	9545	486DX4-100/33		8M/32M	540M
		9545	486DX4-100/33		8M/32M	810M
ThinkPad	760C/CD	9546	Pentium-90		8M/40M	360M
		9546	Pentium-120		8M/40M	720M
		9546	Pentium-90		8M/40M	810M
		9546	Pentium-120		8M/40M	1.2G
ThinkPad	760E/ED	9546	Pentium-120		8M/80M	810M
		9546	Pentium-133		8M/80M	1.0G
		9546	Pentium-150		8M/80M	1.2G
		9546	Pentium-166		8M/80M	1.3G
		9546	Pentium-166		8M/80M	2.1G
ThinkPad	760EL/ELD	9547	Pentium-100		8M/80M	810M
		9547	Pentium-100		8M/80M	1.0G
		9547	Pentium-100		8M/80M	1.2G
		9547	Pentium-120		8M/80M	810M
		9547	Pentium-120		8M/80M	1.0G
		9547	Pentium-120		8M/80M	1.2G
		9547	Pentium-133		8M/80M	810M
		9547	Pentium-133		8M/80M	1.0G
		9547	Pentium-133		8M/80M	1.2G
ThinkPad	760L/LD	9547	Pentium-90		8M/40M	810M
		9547	Pentium-90		8M/40M	1.1G
		9547	Pentium-90		8M/40M	1.2G
		9547	Pentium-120		8M/40M	810M
		9547	Pentium-120		8M/40M	1.1G
		9547	Pentium-120		8M/40M	1.2G
ThinkPad	760X	9546	Pentium-150		32M/80M	3.0G
ThinkPad	760XD	9546	Pentium-166		32M/80M	3.0G
ThinkPad	760XL	9547	Pentium-166		16M/80M	2.1G
		9547	Pentium-166		16M/80M	3.0G

C	Color		T		Tablet
M	Megabyte		TPF		ThinkPad File
P	Pen

4 IBM Mobile Systems - ThinkPad HMM Volume 3

Drive and Diskette Compatibility Matrix

The following table provides identification information for 3.5-inch drives.

Diskette	Identifying
Drive	Mark

3.5-Inch - 1.44MB	1.44 on the eject	button
3.5-Inch - 2.88MB	2.88 on the eject button

The following	table	provides	compatibility information for
3.5-inch diskettes and 3.5-inch diskette drives.

Diskette	1.44MB		2.88MB
Capacity	Drive		Drive

1.0MB	Read/Write		Read/Write
2.0MB	Read/Write		Read/Write
4.0MB	Not	Compatible	Read/Write

The following table provides identification information for

5.25-inch diskette drives.

Diskette			Identifying
Drive			Mark

5.25-Inch	-	360KB	(External)Asterisk	on	bezel
5.25-Inch	-	1.2MB	(Internal)1.2 on	the	eject button

The	following	table	provides		compatibility	information	for
5.25-inch diskettes and 5.25-inch diskette drives.

Diskette		360KB			1.2MB
Capacity		Drive			Drive

360KB		Read/Write			Read/Write
1.2MB		Not	Compatible		Read/Write

Note:	A 360KB	diskette		written	to or formatted on a
	1.2MB	drive	can	be read reliably		only on a	1.2MB
	drive.

Introduction5

Important

Service

Information

Important

Diskette fixes are customer installable.

The diskette

fixes are located on the PC

Company

Bulletin Board

Service (BBS). The direct phone line for modem

connection is 919-557-0001 or tieline 255-0001.

Advise customers to contact the PC Company

HelpCenter at 800-772-2227 if they need assistance in

obtaining or installing any diskette fixes.

Customers

Canada

should

call

IBM

HelpPC at

800-565-3344

for

assistance

down-load

information.

The Canadian BBS phone numbers

are:

Montreal

514-938-3022

Toronto

905-316-4255

Vancouver

604-664-6464

Winnipeg

204-934-2735

FRU Replacement

Strategy

Before

Replacing

Parts

Ensure that all diskette fixes are installed prior to

replacing

any

FRUs

listed

this

manual.

Use the following strategy to prevent unnecessary FRU replacement and service expense:

Ÿ	If you		are instructed		to replace a FRU		and	that
	does	not	correct the		problem,	reinstall	the	original
	FRU	before	you	continue	.
Ÿ	Some	computers			have both a processor board and a
	system board. If you are						instructed to replace either
	the	processor			board	or the system board, and the first
	board that you replaced does not correct the problem,
	reinstall the original board, then replace the other
	(processor			or	system)	board.

Ÿ If	an	adapter or device consists of more	than	one
FRU,	an error code may be caused by any		of	the
FRUs. Before replacing the adapter or device,
remove		the FRUs, one by one, to see if the
symptoms change. Replace only the FRU that
changed		the symptoms.


	Attention

A customized setup configuration (other						than default
settings)		may	exist on the computer you			are servicing.
Running Automatic Configuration may alter those
settings. Note			the	current configuration	settings (using
the View Configuration option) and verify that the
settings		are	in place when service is complete.

6 IBM Mobile			Systems	- ThinkPad HMM Volume	3

The	advanced diagnostic tests are intendedonly	to test
IBM	products. Non-IBM products or modified options can
give	false errors and invalid responses.

Hard	Disk Drive			Replacement Strategy:
Always try		to		run a	low-level	format before replacing a hard
disk	drive.
	Attention
	Attention
The drive startup sequence in the computer you are
servicing might have been changed. Be extremely
careful during write operations such as copying,
saving, or formatting. Data or programs can be
overwritten			if you		select	an incorrect drive.

How	to	Use	Error	Messages
Use the error codes displayed on the screen to diagnose
failures. If			more	than one error code is displayed, begin
the	diagnosis		with	the first error code. The cause of the
first error code can result in false error codes being
displayed. If no				error code is displayed, see if the error
symptom is listed in the Symptom-to-FRU Index for the
computer		you	are	servicing.

How	to	Read	POST	Error	Messages
POST	error messages			are displayed on the screen as
three,		four,	five, or		eight digits. The error messages that
can	be	displayed		as	shorter POST messages are

highlighted in this index. Some digits will represent different information for SCSI errors versus non-SCSI errors.

The following example shows which digits display the shorter POST error messages and also defines the SCSI information in an eight-digit error message.

Shorter POST Messages *3333-3333-3333-33330

++ + + +

*3333-3333-3333-3333-3333-3333-3333-33330 + ð + ð + ð + ð + ð + ð + ð + ð + ,3333"3333"3333"3333"3333"3333"3333"33332

+	+	+	+	+	+	+	+
Reserved	+	+	+	+	+	+	Size (SCSI)
	,3333"33332			+	+	Slot	Number (SCSI)
		Device Code		+	Logical Unit Number (SCSI)
				ID (SCSI)

All SCSI devices are set to a different SCSI ID.

Duplicate SCSI ID settings can generate	a false	error
message. Use the SCSI ID to determine	whether	the error
message is coming from an internal or an	external	device.

Introduction7

Safety Notices (Multi-lingual

Translations)

In this manual, safety notices

appear in English with a

page number reference to the appropriate multi-lingual,

translated

safety

notice

found

this

section.

The

following

safety

notices

are provided

English,

French,

German,

Italian,

and

Spanish

languages.

Safety

Notice

Before the computer is powered-on after

FRU

replacement,

make

sure

all

screws,

springs,

other

small

parts

are

place

and

are not left loose inside

the

computer. Verify

this

shaking

the

computer

and

listening

for

rattling

sounds. Metallic

parts

metal flakes can cause electrical

shorts.

Avant de remettre l'ordinateur sous tension après

remplacement

d'une

unité

clientèle, vérifiez

que

tous les ressorts, vis et

autres pièces sont bien en

place et bien fixées. Pour ce faire, secouez l'unité et

assurez-vous qu'aucun bruit

suspect ne

produit.

Des pièces métalliques ou des copeaux de métal

pourraient causer un court-circuit.

Bevor nach einem FRU-Austausch der Computer

wieder angeschlossen wird, muß sichergestellt

werden, daß keine Schrauben, Federn oder andere

Kleinteile

fehlen

oder

Gehäuse

vergessen

wurden.

Der Computer muß geschüttelt und auf

Klappergeräusche

geprüft

werden. Metallteile

oder

-splitter können Kurzschlüsse erzeugen.

Prima di accendere l'elaboratore dopo che é stata

effettuata la sostituzione di una FRU, accertarsi

che

tutte le viti, le molle e

tutte le altri parti di piccole

dimensioni

siano

nella

corretta

posizione

non

siano

sparse all'interno dell'elaboratore. Verificare ciò

scuotendo l'elaboratore e prestando attenzione ad

eventuali rumori; eventuali parti o pezzetti metallici

possono

provocare

cortocircuiti

pericolosi.

Antes

encender

sistema

despues

sustituir

una

FRU,

compruebe

que

todos

los

tornillos,

muelles

demás piezas

pequeñas

encuentran

sitio

no se encuentran sueltas dentro del sistema.

Compruébelo agitando el sistema y escuchando los

posibles ruidos que provocarían. Las piezas metálicas

pueden

causar

cortocircuitos

eléctricos.

8 IBM Mobile Systems - ThinkPad HMM Volume 3

IBM THINKPAD 365E, THINKPAD 365ED Service Manual

Safety

Notice

Some

standby

batteries

contain a small amount of

nickel

and

cadmium. Do

not disassemble

it,

recharge

it, throw

into

fire

water,

short-circuit

it. Dispose

of the battery as required by local ordinances or

regulations. Use only the battery in the appropriate

parts

listing. Use

an incorrect battery can result in

ignition or explosion of the battery.

Certaines

batteries

secours

contiennent

nickel

et du cadmium. Ne les démontez pas, ne les

rechargez

pas,

les

exposez

feu

l'eau.

Ne les mettez pas en

court-circuit. Pour les mettre au

rebut, conformez-vous à la réglementation en vigueur.

Lorsque

vous

remplacez

la pile de sauvegarde ou

celle de l'horloge temps réel, veillez

n'utiliser

que les

modèles cités dans la liste de pièces détachées

adéquate. Une batterie ou une pile inappropriée

risque de prendre feu ou

d'exploser.

Die Bereitschaftsbatterie, die sich unter dem

Diskettenlaufwerk befindet, kann geringe Mengen

Nickel und Cadmium enthalten. Sie darf nur durch die

Verkaufsstelle oder den IBM Kundendienst

ausgetauscht werden. Sie darf nicht zerlegt,

wiederaufgeladen, kurzgeschlossen, oder Feuer oder

Wasser ausgesetzt werden. Die Batterie kann

schwere

Verbrennungen

oder

Verätzungen

verursachen. Bei der Entsorgung die örtlichen

Bestimmungen

für

Sondermüll

beachten. Beim

Ersetzen der Bereitschaftsoder Systembatterie nur

Batterien des Typs verwenden, der in der

Ersatzteilliste aufgeführt ist. Der Einsatz falscher

Batterien

kann

Entzündung

oder

Explosion

führen.

Alcune batterie di riserva contengono una piccola

quantità di nichel e cadmio. Non smontarle, ricaricarle,

gettarle nel fuoco o nell'acqua né cortocircuitarle.

Smaltirle secondo la normativa in vigore (DPR 915/82,

successive

disposizioni

e disposizioni locali). Quando

si sostituisce la batteria dell'RTC (real time clock) o la

batteria di supporto, utilizzare soltanto i tipi inseriti

nell'appropriato Catalogo parti. L'impiego di una

batteria non adatta potrebbe determinare l'incendio o

l'esplosione

della

batteria

stessa.

Algunas baterías de reserva contienen una pequeña cantidad de níquel y cadmio. No las desmonte, ni recargue, ni las eche al fuego o al agua ni las cortocircuite. Deséchelas tal como dispone la normativa local. Utilice sólo baterías que se

encuentren en la lista de piezas. La utilización de una batería no apropiada puede provocar la ignición o explosión de la misma.

Introduction9

Safety Notice

The

battery

pack

contains small

amounts

nickel.

not

disassemble

it,

throw

into

fire

water,

short-circuit it. Dispose of the battery pack as

required

local

ordinances or regulations. Use only

the battery in the appropriate parts listing when

replacing

the

battery pack. Use of an incorrect battery

can

result

ignition or explosion of the battery.

batterie

contient

nickel. Ne

démontez

pas,

l'exposez

feu

à l'eau. Ne

mettez

pas

court-circuit. Pour

mettre

rebut,

conformez-vous

à la réglementation en vigueur. Lorsque vous

remplacez la batterie, veillez à n'utiliser que les

modèles cités dans la liste de pièces détachées

adéquate. En

effet,

une

batterie

inappropriée

risque

de prendre feu ou d'exploser.

Akkus enthalten geringe Mengen von Nickel. Sie

dürfen

nicht

zerlegt,

wiederaufgeladen,

kurzgeschlossen, oder Feuer oder Wasser ausgesetzt

werden. Bei der Entsorgung die örtlichen

Bestimmungen für

Sondermüll

beachten. Beim

Ersetzen der Batterie nur Batterien des Typs

verwenden,

der

Ersatzteilliste

aufgeführt

ist.

Der Einsatz falscher Batterien kann zu

Entzündung

oder

Explosion

führen.

La batteria contiene piccole quantità di nichel. Non smontarla, gettarla nel fuoco o nell'acqua né cortocircuitarla. Smaltirla secondo la normativa in vigore (DPR 915/82, successive disposizioni e

disposizioni locali). Quando si sostituisce la batteria, utilizzare soltanto i tipi inseriti nell'appropriato Catalogo parti. L'impiego di una batteria non adatta potrebbe determinare l'incendio o l'esplosione della batteria stessa.

Las baterías contienen pequeñas cantidades de
níquel. No las desmonte, ni recargue, ni						las	eche	al
fuego	o al	agua		ni las	cortocircuite.	Deséchelas		tal
como dispone		la	normativa		local. Utilice	sólo	baterías
que se encuentren en la lista de piezas al sustituir la
batería. La utilización de una batería no apropiada
puede	provocar		la	ignición o explosión		de	la misma.

10 IBM Mobile Systems - ThinkPad HMM Volume 3

Safety

Notice

The

lithium

battery can cause a fire,

explosion, or

severe burn. Do not recharge it, remove

its polarized

connector, disassemble it, heat it above

100°C

(212°F),

incinerate

it, or expose its cell contents to

water. Dispose of the battery as required by local

ordinances or regulations. Use only the battery in the

appropriate

parts

listing. Use

incorrect

battery

can

result

ignition

explosion

the

battery.

La pile de sauvegarde contient du lithium. Elle

présente des risques d'incendie, d'explosion ou de

brûlures

graves. Ne

rechargez

pas,

retirez

pas

son connecteur polarisé et ne la démontez pas. Ne

l'exposez

pas

une

temperature

supérieure

100°C,

faites

pas

brûler et

n'en

exposez

pas

contenu

à l'eau. Mettez la pile au rebut conformément à la

réglementation en vigueur. Une pile inappropriée

risque

prendre

feu

d'exploser.

Die

Systembatterie

ist eine Lithiumbatterie. Sie kann

sich entzünden, explodieren oder schwere

Verbrennungen hervorrufen. Batterien dieses Typs

dürfen

nicht

aufgeladen,

zerlegt,

über

100

erhitzt

oder verbrannt werden. Auch darf ihr Inhalt nicht mit

Wasser

Verbindung gebracht oder der zur richtigen

Polung

angebrachte

Verbindungsstecker

entfernt

werden. Bei der Entsorgung die örtlichen

Bestimmungen

für

Sondermüll

beachten. Beim

Ersetzen der Batterie nur Batterien des Typs

verwenden,

der in der Ersatzteilliste aufgeführt ist.

Der

Einsatz

falscher Batterien kann zu Entzündung

oder

Explosion

führen.

La batteria di supporto e una batteria al litio e puo

incendiarsi, esplodere o procurare gravi ustioni.

Evitare di ricaricarla, smontarne il connettore

polarizzato, smontarla, riscaldarla ad una temperatura

superiore

100

gradi

centigradi,

incendiarla

gettarla

acqua.

Smaltirla

secondo la normativa in vigore

(DPR 915/82, successive disposizioni e disposizioni

locali). L'impiego di una batteria non adatta potrebbe

determinare l'incendio o l'esplosione della batteria

stessa.

bateria

de repuesto es una bateria de litio y puede

provocar incendios, explosiones o quemaduras

graves. No la recargue, ni quite el conector

polarizado,

desmonte,

caliente

por

encima

los 100°C (212°F), ni la incinere ni exponga el

contenido de sus celdas al agua. Deséchela tal como

dispone

normativa

local.

Introduction11

Safety

Notice

the

LCD

breaks

and

the

fluid

from

inside

the

LCD

gets into your eyes or

on your

hands,

immediately

wash the affected areas with water for at least 15

minutes. Seek

medical

care

any

symptoms

from

the

fluid

are

present

after

washing.

panneau

d'affichage

cristaux

liquides

brise

que

vous

recevez

dans

les

yeux

sur

les mains

une

partie

du fluide, rincez-les

abondamment

pendant

au moins quinze minutes. Consultez

médecin

des symptômes

persistent

après

lavage.

Die Leuchtstoffröhre im LCD-Bildschirm enthält

Quecksilber. Bei der Entsorgung die örtlichen

Bestimmungen

für

Sondermüll

beachten. Der

LCD-Bildschirm besteht aus Glas und kann

zerbrechen, wenn er unsachgemäß behandelt wird

oder der Computer auf den Boden fällt. Wenn der

Bildschirm beschädigt ist und die darin befindliche

Flüssigkeit

Kontakt mit Haut und Augen gerät,

sollten

die

betroffenen

Stellen mindestens

Minuten

mit Wasser abgespült und bei Beschwerden

anschließend

ein

Arzt

aufgesucht

werden.

Nel caso che caso l'LCD

si dovesse rompere ed il

liquido

esso

contenuto

entrasse in contatto con gli

occhi o le mani, lavare immediatamente le parti

interessate

con

acqua

corrente

per

almeno

minuti;

poi consultare un medico se i sintomi dovessero

permanere.

LCD

rompe y el fluido de su interior entra en

contacto con sus ojos o sus manos, lave

inmediatamente

las áreas

afectadas

con

agua

durante

minutos

como

mínimo. Obtenga

atención

medica

si se presenta algún síntoma del fluido despues de

lavarse.

12 IBM Mobile Systems - ThinkPad HMM Volume 3

Safety Notice

To avoid shock, do not remove the plastic

cover that

surrounds

the

lower

portion

the

inverter

card.

Afin

d'éviter

tout

risque

choc

électrique, ne

retirez

pas le cache en plastique protégeant la partie

inférieure

de la

carte

d'alimentation.

Aus Sicherheitsgründen

die

Kunststoffabdeckung,

die

den

unteren Teil der Spannungswandlerplatine umgibt,

nicht

entfernen.

Per evitare scosse elettriche, non rimuovere la

copertura

plastica

che

avvolge

parte

inferiore

della

scheda

invertitore.

Para

evitar

descargas,

quite

cubierta

plástico

que

rodea

parte

baja

tarjeta

invertida.

Safety Notice 7

Though main batteries have low voltage, a shorted or grounded battery can produce enough current to burn combustible materials or personnel.

Bien que		le voltage des batteries principales soit peu
élevé, le court-circuit ou la mise à la masse d'une
batterie peut produire suffisamment de courant pour
brûler des matériaux combustibles ou causer des
brûlures		corporelles	graves.
Obwohl Hauptbatterien eine niedrige Spannung
haben,	können sie doch bei Kurzschluß			oder Erdung
genug Strom abgeben, um brennbare Materialien zu
entzünden oder Verletzungen bei Personen
hervorzurufen.
Sebbene le batterie di alimentazione siano a basso
voltaggio,		una batteria in corto circuito o a massa può
fornire corrente sufficiente da bruciare materiali
combustibili o provocare ustioni ai tecnici di
manutenzione.
Aunque	las	baterías	principales tienen	un voltaje bajo,
una batería cortocircuitada o con contacto a tierra
puede producir la corriente suficiente como para
quemar	material combustible o provocar quemaduras
en el	personal.

Introduction13

	Safety		Notice	8

Before			removing		any FRU, power-off the		computer,
unplug		all power			cords from electrical	outlets, remove
the battery pack, then disconnect any interconnecting
cables.
Avant de retirer une unité remplaçable en clientèle,
mettez le système hors tension, débranchez tous les
cordons d'alimentation des socles de prise de courant,
retirez la batterie et déconnectez tous les cordons
d'interface.
Die		Stromzufuhr			muß abgeschaltet, alle	Stromkabel
aus		der Steckdose gezogen, der Akku entfernt und
alle		Verbindungskabel abgenommen sein, bevor eine
FRU		entfernt		wird.
Prima di rimuovere qualsiasi FRU, spegnere il
sistema, scollegare dalle prese elettriche tutti i cavi di
alimentazione, rimuovere la batteria e						poi scollegare i
cavi		di	interconnessione.
Antes de quitar una FRU, apague el sistema,
desenchufe todos los cables de las tomas de corriente
eléctrica, quite la batería y, a continuación,
desconecte cualquier cable de conexión entre
dispositivos.

14 IBM Mobile Systems - ThinkPad HMM Volume 3

Safety Information

The following section contains the safety information that you need to be familiar with before servicing an IBM mobile computer.

General Safety

Follow these rules to ensure general safety:

ŸObserve good housekeeping in the area of the

machines

during

and

after

maintenance.

Ÿ When

lifting

any

heavy

object:

Ensure

you

can

stand

safely

without

slipping.

Distribute the weight of the object equally

between

your

feet.

Use

slow lifting force. Never move suddenly

twist

when you attempt to lift.

Lift

standing or by pushing up with your leg

muscles; this action removes the strain from the

muscles in your backDo .not attempt to lift any

objects

that

weigh

more than

(35 lb)

objects

that

you think

are too

heavy for

you.

ŸDo not perform any action that causes hazards to the

customer, or that makes the equipment unsafe.

ŸBefore you start the machine, ensure that other

service		representatives		and the	customer's	personnel
are	not	in a	hazardous	position.
Ÿ Place	removed		covers and	other	parts in a	safe

place, away from all personnel, while you are

servicing

the

machine.

Ÿ Keep

your tool case away

from walk areas so that

other

people

will

not

trip

over it.

not

wear

loose

clothing

that can be trapped in the

moving

parts

machine. Ensure

that

your

sleeves

are fastened or rolled up

above

your

elbows. If

your

hair

long,

fasten

it.

Insert

the

ends

your

necktie

scarf

inside

clothing

or fasten it with a nonconductive clip, approximately 8

centimeters

inches) from

the

end.

not

wear

jewelry,

chains, metal-frame

eyeglasses,

or metal fasteners for your clothing.

Attention: Metal objects are good electrical conductors.

ŸWear safety glasses when you are: hammering,

drilling soldering, cutting wire, attaching springs, using

solvents, or working	in	any other conditions that might
be hazardous to	your	eyes.

ŸAfter service, reinstall all safety shields, guards,

labels, and ground wires. Replace any safety device that is worn or defective.

ŸReinstall all covers correctly before returning the machine to the customer.

Introduction15

Electrical Safety

Observe the following rules when working on electrical equipment.

	Important
	Important
Use		only	approved tools and test equipment. Some
hand		tools		have	handles	covered	with a		soft material
that does not insulate you when working with live
electrical			currents.
Many customers have, near their							equipment, rubber
floor mats that contain small conductive fibers to
decrease electrostatic discharges. Do not use this
type		of	mat to		protect	yourself from		electrical shock.

ŸFind the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the

switch

unplug

the

power

cord

quickly.

not

work

alone under hazardous conditions or

near equipment

that

has

hazardous

voltages.

Disconnect

all power

before:

–

Performing

mechanical inspection

–

Working

near

power

supplies

–

Removing

installing

main

units

Before

you

start

work

on the machine, unplug the

power

cord.

you

cannot

unplug it, ask the customer

power-off

the

wall

box

that

supplies

power

to the

machine

and

lock

the

wall box

the

off

position.

ŸIf you need to work on a machineexposedthat has

electrical circuits, observe the following precautions:

–Ensure that another person, familiar with the power-off controls, is near you.

Attention: Another person must be there to switch off the power, if necessary.

–Use only one hand when working with

powered-on electrical equipment; keep

the

other

hand in your pocket or behind your back.

Attention:

There

must

complete

circuit

cause electrical shock. By observing the above

rule, you may prevent a current from passing

through your

body.

–

When

using

testers,

set

the

controls

correctly

and use the approved probe leads and

accessories

for

that

tester.

–

Stand

suitable

rubber

mats

(obtained

locally,

if necessary)

insulate

you from

grounds

such

as metal floor strips and machine frames.

Observe

the

special

safety

precautions

when

you

work

with

very

high

voltages;

these instructions

are in

the safety sections of maintenance information. Use

extreme

care

when

measuring

high

voltages.

16 IBM Mobile

Systems

ThinkPad

HMM

Volume

Ÿ	Regularly inspect and maintain your						electrical	hand
	tools	for safe		operational		condition.
Ÿ	Do not	use	worn	or	broken	tools and testers.
Ÿ	Never	assume that		power has		been	disconnected
	from a circuit.checkFirst,that it has been
	powered-off.
Ÿ	Always	look	carefully		for possible		hazards in	your
	work area. Examples of these hazards are moist
	floors, nongrounded power extension cables, power
	surges, and		missing		safety	grounds.

ŸDo not touch live electrical circuits with the reflective

surface of a plastic dental mirror. The surface is


conductive;				such touching can cause personal injury
and	machine			damage.
Ÿ Do	not	service			the followingth partsthe power on
when	they are removed from their normal operating
places		in	a	machine:
–	Power		supply		units

–Pumps

– Blowers and fans

–Motor generators

and similar units. (This practice ensures correct
grounding			of	the	units.)
Ÿ If	an		electrical			accident		occurs:
–	Use	caution;		do not		become	a victim
	yourself.
–	Switch		off	power.
–	Send	another		person	to	get	medical	aid.

Safety Inspection Guide

The intent of this inspection guide is to assist you in

identifying potentially	unsafe conditions	on these		products.
Each machine, as it was designed and built,			had	required
safety items installed	to protect users	and	service

personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of non-IBM

features		or	options not		covered by this inspection guide.
If	any	unsafe		conditions	are present, you must determine
how	serious		the	apparent	hazard could be and whether
you	can	continue		without	first correcting the problem.

Consider these conditions and the safety hazards they present:

ŸElectrical hazards, especially primary power (primary

voltage on the frame can cause serious or fatal electrical shock).

Ÿ Explosive hazards, such as a damaged CRT face or bulging capacitor

ŸMechanical hazards, such as loose or missing hardware

Introduction17

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