IBM 6151 Manual

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IBM RT PC
6151
System Unit Hardware
Maintenance and Service
Personal Computer
Hardware Reference
Library

The following statement applies to this IBM product. The statement for other IBM products intended
for use with this product will appear in their accompanying manuals.
Federal Communications Commission (FCC) Statement
Warning: This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used in accordance with the instructions manual, may cause interference to radio
communications. It has been tested and found to comply with the limits for a Class A computing
device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in a commercial environment. Operation of this
equipment in a residential area is likely to cause interference in which case the user at his own
expense will be required to take whatever measures may be required to correct the interference.
Instructions to User: Properly shielded and grounded cables and connectors must be used for
connection to peripherals in order to meet FCC emission limits. Proper cables are available from
IBM authorized dealers. IBM is not responsible for any radio or television interference caused by
using other than recommended cables or by unauthorized modifications to this equipment. It is the
responsibility of the user to correct such interference.
CAUTION:
This product is equipped with a 3-wire power cord and plug for the user's safety. Use this
power cord in conjunction with a properly grounded electrical outlet to avoid electrical
shock.
Third Edition June 1988
This is a major revision of the second edition of the IBM RT PC 6151 System Unit Hardware Maintenance and Service manual
dated September 1986. This manual incorporates all maintenance information for the IBM 6151 up to the date of this edition.
Changes are made periodically to the information herein; these changes will be incorporated in new editions of this publication.
References in this publication to IBM products, programs, or services do not imply that IBM intends to make these available in
all countries in which IBM operates. Any reference to an IBM licensed products in this publication is not intended to state or
imply that only IBM's licensed product may be used. Any functionally equivalent program may be used instead.
International Business Machines Corporation provides this manual Has is," without a warranty of any kind, either
expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a
particular purpose. IBM may make improvements and/or changes in the product(s) and/or the program(s) described
in this manual at any time.
Products are not stocked at the address given below. Requests for copies of this product and for technical information about
the system should be made to your IBM authorized RT Personal Computer dealer.
A reader's comment form is provided at the back of this publication. If the form has been removed, address comments to IBM
Corporation, Department 998, 11400 Burnet Road, Austin, Texas 78758. IBM may use or distribute whatever information you
supply in any way it believes appropriate without incurring any obligation to you.
IBM is a registered trademark of International Business Machines Corporation.
RT PC is a registered trademark of International Business Machines Corporation.
© Copyright International Business Machines Corporation 1985, 1986, 1988. All rights reserved.

Safety
This manual contains a "Safety Inspection Guide" on the following
pages. The Safety Inspection Guide is used by the IBM Service
Representative.
The IBM 6151 System Unit contains no hazardous voltages or
safety grounds outside the power supply. The power supply is a
sealed unit and is not field serviceable.
This manual contains DANGER notices on pages 4-24 and 4-25.
The following pages contain translations of the DANGER notices
and the following caution notice.
CAUTION
Before removing any cover or disconnecting any signal
cable, set the power switches on the system unit and all
attached devices to Off; then unplug all external power
cables from the outlets.
(6/88) Safety iii

Safety Translations
DANISH
Section 4
IBM RT PC Udskiftning og erstatning af batterier -FARE. Fare for brand, eksplosion
og forbranding. Batteriet me ikke genoplades, skilles ad, udsattes for temperaturer over
100 grader; der me ikke loddes direkte pe e1ementet, e1ementet me ikke forbrandes eller
komme iforbindelse med vand.
Hold batteriet yak fra born. Me kun udskiftes med IBM reservedel nr. 6299201 eller et
batteri, der anbefales af Underwriters Laboratories, Inc. til brug iIBM 6151, og som er
klassificeret derfra. Brug
af et andet batteri kan medfore brandeller ekplosionsfare.
iv Service Manual

DUTCH
Waarschuwing
Schakel
de systeemeenheid en aile randapparatuur uit en haal de netspanningsstekkersvan de
systeemeenheid en van aile randapparatuur uit de stopcontacten, voordat ueen kap opent of
een signaalkabelloshaalt.
Section 4
"Verwijdering en vervanging van IBM RT PC - batterijen - LET OP! Gevaar voor
brand, ontploffing en ernstige brandwonden. Laad de batterijen niet opnieuw op, haa! ze
niet uit elkaar, verhit ze niet boven 100&degr.C, verbrand ze niet, stel de inhoud van de
batterij niet
bloot aan water en soldeer niets aan de batterijcel vast.
Houd de batterijen uit de buurt van kinderen. Gebruik bij vervanging IBM-batterijen
bestelnummer 6299201 of batterijen die speciaal voor gebruik met de IBM 6151 zijn
goedgekeurd
door de Underwriters Laboratoires Inc. en waarop dat ook staat
aangegeven. Als u andere batterijen gebruikt loopt uhet risico dat er brand ontstaat of
dat zich een ontploffing voordoet'.'
(6/88) Safety v

FINNISH
Huomlo
Ennen minkaan yhteyskaapelin tai kannen irroittamista. katkaise villa sySleemiyksikOsta ja
kaikista siihen Iiitetyista laitteista; irroita sitten kaikki ver1<kojohdot pistorasioistaan.
Sivu 4-24
IBM RT PC:n pariston poisto ja vaihto -VAARA
Tulipalon, rajahdyksen
ja vakavien palovammojen vaara. Ala lataa paristoa uudelleen,
pura sita, kuumenna sitalampotilaan yli 100odeg. C, juota paristoa kiinni, havita sita
polttmalla tai anna sen kastua. Pida paristo poissa lasten ulottuvilta. Vaihda kaytetyn
pariston tilaile vain paristo, jonka IBM-tilausnumero on 6299201 tai joka on hyvaksytty
kaytettavaksi IBM
6151 -koneen kansaa. Muunlaisten paristojen kaytto saattaa
aiheuttaa tulipalon tai rajahdyksen vaaran.
vi Service Manual

FRENCH
Attention!
Avant de retirer Ie carter de protection ou de debrancher les cAbles de signalisation:
Mettre en position hors tension tous les interrupteurs
de I'unite et des peripheriques.
-Debrancher tous les cordons d'aiimentation de leur prise murale.
Page 4-24, 4-25
Retrait et remplacement de la pile de I'IBM RT PC - DANGER -Tenir hors de portee
des cnfants.
Ne pas recharger,
demonter ou souder. Ne pas exposer la pile it une temperature
excedant 100 C. Ne pas la mettre au feu ni it ['cau.
Risques d'incendie,
d'explosion ou de brulure grave.
N'utiliser
sur l'IBM RT PC que les piles IBM Nr. 6299201 ou celles dont la classification
"pour IBM 6151" est clairement specifiee par des laboratoires agrees.
L'utilisation de toute autre pile presente un risque d'inccndie ou d'explosion.
(6/88) Safety vii

GERMAN ACHTUNG
Achtung
Vor dem Entfernen von Verkleidungen oderdem Trennen von Signalkabeln Netzschalter
der
Systemeinheit und aller angeschlossenen Gerate ausschalten. Dann aile Netzkabel aus den
Netzsteckdosen ziehen.
Seiten 4-24 nnd 4-25
Ausbau und Einbau der Batterie beim IBM RT PC -Gefahr.
Feuer-, Explosions- und Verbrennungsgefahr. Zelle nicht laden, zerrlegen, ueber
100
Grad Cerhitzen, keine Loetstelle direkt an der Zelle anbringen, Zelle nicht verbrennen
oder den Inhalt mit Wasser in Beruehrung bringen.
Kindersicher aufbewahren. Als Ersatz ausschliesslich IBM
Original-Batterien verwenden.
Bei Verwendung
anderer Batterien besteht Feuer- und Explosionsgefahr.
viii Service Manual

ITALIAN
Attenzlone
Prima di togliere qualsiasi coperchio 0scollegare qualsiasi cavo di segnale, spegnere gli
interruttori di alimentazione dell'unitadi sistema edi tutti idispositivi collegati; scollegare poi
dalle prese di corrente tutti icavi di alimentazione estemi.
pagg. 4-24 e4-25
Rimozione esostituzione della batteria del PC RT IBM - PERICOLO.
Rischio di gravi ustioni, esplosione ed incendio. Non caricare, disassemblare 0riscaldare
ad una temperatura superiore ai 100 gradi, non effettuare saldature direttamente
sull'elemento, incenerire 0metterne il contenuto adiretto contatto con l'acqua. Tenere
lontano dalla
portata dei bambini. Usare un ricambio IBM (numero parte 6299201),
oppure
una batteria specificatamente consigliata dalla Underwriters Laboratories, Inc.
per il 6151 IBM everificare che tale classificazione sia espressamente indicata. L'utilizzo
di
una qualsiasi altra batteria pun rappresentare un rischio di incendio 0esplosione.
(6/88) Safety ix

JAPANESE
'kX. )','Ji'.. :-:; J: Uffi~'"\"'lt C (l)Ji)J51;/); tJ 'J ~ -, 0 }~ ';! T I) -0 jl}1c~~-' '",. 7Hr-r'S,
1 00
0C
~J..tI::1.~'r:;:,. }{ ':. T I) -rlr,,;:~~ '"' *1:: t: G T'Ji(l) -::. I:: ~;l:ij; L.l 1]'1J b1,):,;
l(t'-:<~'o 'f{~I;l:i'I-jlt1';~'l(t'-~~'o I BM£B,§i,fu~}629920 1;/)', il?:;:'~'I:t.
U n d e r writ c r s Lab a rat a r ie s. Inc. I:: J: '0 l .
I BM6151ml::{:VlJ~h:::'I::Rmfl::miE~h. '<:0)J:?1Jm;t;/)q ... :::,~t1.l~';';'
}~ ':J T I) -(I),,," I:: ::Zl;:'!'r:::, J: 71:: L. '[ <. t: ~"o {t!lo)}\ ,;! T I) - ~ (f~' J: -, 1::. 'AX"\'"
PI)€ 0) h2: f{:! h; 0:> 'J ;!: -r 0
x Service Manual

NORWEGIAN
Adyarsel
Fardu tar aydekselet eller trekker ut signalkabler, m~ du sl~ ay nettbryterne p~ systemenheten
og aile tilkoplede enheter (AV, Offeller 0) og trekke ut aile nellkableneIra stikkontaktene.
Kapite114: "Bytte av batterier -FARE. Pa grunn av brann- og
eksplosjonsfare rna batteriene ikke lades opp, las fra hverandre, brennes eller ulsettes for
slerk varrne.
Oppbevar batteriene ulilgjengelig forn barn. Bruk bare IBMs batterier rned
delnurnrner 6299201. Bruk av feil lype
batteri kan forarsake brann eller ekplosjon':
(6/88) Safety xi

PORTUGUESE
Cuidado
Antes de remover qualquertampaou dedesligarqualquercabo de sinal coloque os interruptores
de corrente elo~ctrica da unidade do sistema ede todos os dispositivos aela ligados na posi9ao
de desligado (off) edesligue das tomadas todos os cabos externos de corrente electrica.
Seccao 4
Faginas 4 a 24
PERIGO - AD retirar e substituir a bateria IBM RT PC pode haver perigo de incendio
explosao e queimaduras graves. Nao recarregue, desmonte, aqueca amais de 100 graus-
C, solde directamente acClula, incinere ou deite 0contetido na agua. Mantenha afastada
das criancas. Substitua apenas por uma bateria IBM PIN 6299201 ou par uma bateria
especificamente designada pelos Underwriters Laboratories, Inc. para ser usada com a
IBM 6151.
Autilizacao de outro tipo de bateria pode representar risco de fogo au explosao.
xii Service Manual

SPANISH
Precaucion
Antes de quitar cualquier cubierta 0desconectarcualquier cable de se6al, coloque los
interruptores
de alimentacion en la unidad del sistema y en todos los dispositivos conectados
en posicion de APAGADO; desenchufe entoncestodos los cables externos de alimentacion de
las tomas de corriente.
Pag. 4-24, 4-25
PELlGRO
Riesgo de fuego, explosi6n y quemaduras graves. No recargue, ni desmonte, ni exponga
a temperaturas superiores a 100" C, ni suelde directamente en la bateria, ni queme, ni
ponga en contacto con el agua el contenido de la bateria. Mantengala fuera del alcance
de los niiios. Sustituyala unicamente
por la pieza IBM N6299201 0 por una bateria
especificamente clasificada
por Underwriters Laboratoires, I nco para utilizarse en cl IBM
6151 yque este marcada indicando dicha clasificaci6n. La utilizaci6n de otra bateria
puede presentar riesgo de fuego 0de explosi6n.
(6/88) Safety xiii

SWEDISH
Varnlng
Innan du tar bart n~gon k~pa eller lossar n~gon signalkabel mAste du sl~ fr~n strOmbrytama pA
systemenheten och alia anslutna enheter sam! lossa alia niitkablar fr~n sina uttag.
Pa sidorna 4-24 och 4-25
YARNING -Brand- och explosionsrisk. Batteriet far cj laddas. tas isar. utsatts for
temperatur over 100 grader eller brannas. Lodning direkt pa batteriet far cj ske.
Batteriets innchall far
cj komma i kontakt med vatten. Forvaras oatkomligt for barn.
Byt
endast mot batteri med IB Mbestallningsnummer 629920 I.
Anvandning av annat batteri kan medfora risk for brand eller explosion.
xiv Service Manual

Safety Inspection Guide
Use this guide to identify unsafe conditions. Use good judgment to
identify potential safety hazards not covered by this guide. If
unsafe conditions are present, determine how serious the hazards
are and whether you should continue before correcting the
problem.
Do the following checks:
1. Check the covers for damage or alterations that expose the
internal parts of the system unit or for sharp edges.
2. Check the covers for proper fit to the system unit. They should
be in place and secure.
AJZBOOI
(6/88) Safety xv

xvi Service Manual
3. Set the power switch on the system unit to Off.
4. Remove the rear cover. If needed, see Section 4.
5. Remove the top cover. If needed, see Section 4.
6. Check for alterations or attachments. If there are any, check
for obvious safety hazards such as broken wires, sharp edges, or
broken insulation.
7. Check the internal cables for damage.
8. Check for dirt, water, and any other contamination within the
system unit.
o
o
o
o
o
~::::::
--"'-.
AJZB014

"--
9. Check the voltage label on the rear of the system unit to ensure
it matches the voltage at your outlet.
10. Check the external power cable for damage.
11. With the external power cable connected to the system unit,
check for less than 0.1 ohm resistance between the ground lug
on the external power cable plug and the metal frame.
12. Install the top cover. If needed, see Section 4.
13. Install the rear cover. If needed, see Section 4.
Metal
Frame
External
Power Cable
Ground Lug
Rear
Fa.
MlBOOS
(6/88) Safety xvii

xviii Service Manual

About This Book
This manual provides service information about the IBM 6151
System Unit, adapters, and attached devices that do not have their
own service information. This manual does not contain service
information about attached printing and plotting devices.
Users of this manual should have training on the IBM 6151 System
Unit.
This manual is divided into sections to make the information easier
to find. A three or four-digit code is used in the page numbering of
some sections to make future updating easier.
Section 1, "System Description" contains a brief description of the
system unit, keyboard, and display.
Section 2, "Diagnostics" contains descriptions of the diagnostic
programs, utilities, and the service request number.
Section 3, "Problem Isolation Charts" contains the service
procedures used to isolate failures to a field-replaceable unit.
Section 4, "Removal and Replacement Procedures" contains the
locations, removal procedures, and replacement procedures. These
procedures may direct you to another section for specific details
such as switch settings, jumper settings, or terminator resistor
settings.
Section 5, "Base System Unit" contains a description,
specifications, cabling diagrams, a data flow diagram, and parts
information for the base components of the system unit.
Section 6, "System Memory Options" contains a description,
specifications, and parts information for each system memory
option.
(6(88) About This Book xix

xx Service Manual
Section 7, "Diskette Drive" contains a description, specifications,
terminator resistor setting, and parts information for the diskette
drive.
Section 8, "Fixed-Disk Drives" contains a description,
specifications, terminator resistor settings, and parts information
for the fixed-disk drives.
Section 9, "Adapters" contains a description, specifications, switch
or jumper settings, and parts information for each adapter used in
the system unit.
Section 10, "User Input Devices" contains a description,
specifications, a removal procedure, a replacement procedure, and
parts information for each type device used to input data or
commands.
Section 11, "Displays" contains a description, specifications,
control adjustment procedures, and parts information for each IBM
display used with the IBM 6151 System Unit.
Section 12, "Tape Drive" contains a description, specifications, and
parts information for the tape drive used with the IBM 6151 System
Unit.
Appendix A, "Tool Requirements" contains descriptions of the tools
needed to service the IBM 6151 System Unit.
Appendix B, "SRA to FRU Cross-Reference List" contains a list of
each Service Repair Action (SRA) number and the part number and
part name of the field-replaceable unit it represents.
Appendix C, "Error Log Information" provides an overview of the
Error Log reports, commands, and command examples.
A Reader's Comment Form and Book Evaluation Form are
provided at the back of this book. Use the Reader's Comment
Form at any time to give IBM information that may improve the
book. After you become familiar with the book, use the Book
Evaluation Form to give IBM specific feedback about the book.