Star NX-1001 User manual

DOT MATRIX PRINTER
NX-1001
LC-20
TECHNICAL MANUAL
[SIXTH EDITION]

NOTICE
•Allrightsreserved.Reproductionofanypartofthismanualinany
form whatsoever, without STAR’s express permission is forbid-
den.
•The contents of this manual are subject to change without notice.
•All efforts have been made to ensure the accuracy of the contents
of this manual at the time of going to press. However, should any
errors be detected, STAR would greatly appreciate being in-
formed of them.
•The above notwithstanding, STAR can assume no responsibility
for any errors in this manual.
© Copyright 1990
-
1997 Star Micronics Co.,Ltd.

INTRODUCTION
This manual is an introduction to dot matrix printers as shown below.
It is intended for use as a reference for periodic inspections and maintenance procedures.
This manual is prepared for use at a technical level and not for the general user.
Model Destination
NX1001 MULTI-FONT For American, Asian, and Russian market
LC-20 For European and Pacific market
•This manual is divided into the following sections:
Chapter 1 General Specifications
Chapter 2 Theory of Operation
Chapter 3 Adjustments
Chapter 4 Parts Replacement
Chapter 5 Maintenance and Lubrication
Chapter 6 Troubleshooting
Chapter 7 Parts List
•First edition : Jul. 1990
Second edition : Feb. 1991
Third edition : Mar.1993
Fourth edition : Aug.1994
Fifth edition : Aug.1996
Sixth edition : Aug.1997
1
5
2
3
4
7
6

(Blank Page)

C1
GS
1. GeneralSpecifications.........................................................................................3
2. ExternaiAppearanceand Composition
..............................................................5
2NoP........................................................................................................5
2DS
Se
.-.----
2CoPCo............................
3. Paraiieiinterface....................................................................................................8
3GeSpe........m..m..
3Con..........u-.-..
4Ser(o
........................................................................................9
4GeSpe
............................................................................................9
4Co
Si
aFuDe...
4DiSe
...............................................................................................10

I

GENERAL SPECIFICATIONS
1. General Specifications
Pr
Printingmethod Serialimpactdotmatrix
Piintingspeed 150characterspersecond(inDraftpica)
37.5characterspersecond(inNLQpica)
Databuffer 4Kbyteswhennotusedfordownloadcharacters
l-Linebufferwhenusingdownload
Paperfeed 2.8inches/second(duringpagefeed)
Frictionandpush-tractorfeed
Printingdirection Draft:bi-directionalorunidirrxxional(selectable),logicseeking
NLQandgraphics:unidirectional,logicseeking
Characterset
Standardcharacterset 96 ASCIIcharacter
IBMcharacterset 244characters(ASCII,internationalcharacters,symbols,blockgraphics)
Downloadablecharacters Max.192(draft)or74 (NLQ)
Internationalcharactersets”’ 14sets(USA,France,Germany,England,DcnmarkI,DenmarkII,Sweden,Italy
SpainI, SpainII,Japan,Norway,LatinAmerica,Denmark/Norway)
Dotmatrixsize
Charactermatrix 9 x 11(Draft)
18X23(NLQ) DPI
Normal (8or9) x480 60
Double (8or9) x960 120
High-speeddouble (8or9) x960 120
Quadruple (8or9) x1920 240
CRTI(8or9) x640 80
CRTII (8or9)x 720 90
Plotter (80r9) x576 7
Double-plotter (8or9) x1152 144
Linespacing 1/6inchstandard 1/8,nf72,orn/216inchprogrammable
Columnwidth 80,normalpica 96,normalelite
137,condensedpica 160,condensedelite
.. . .
*1 InthecaseofRussianversion,theinternationalcharactersetsareehmmated.
P
Singlesheets 5.5- 8.5incheswide 0.07-0.10 mmthick
Fanfoldpaper 4-10 incheswide 0.07-0.10 mmthick(single-ply)
Max,0.28mmthick(3-ply)
-3-

GENERAL SPECIFICATIONS
Pr
Dimensions Height120mm(4.7inches) Width396mm(15.6inches)
Depth301mm(11.8inches)
Weight 5.1kg (11.2pounds)
Power 120VAC*1O%,60Hz. 220VAC+1O%,50/60Hz.
240VAC+1O’%,50/60Hz.
Powerconsumption Typ.36W.Max.80W
Environment Operatingtemperature:5to40”C(41to I04”F)
Operatinghumidity:10to 80%,noncondensation
Storagetemperature:–30to 65°C(-22 to 149°F)
Storagehumidity:10%to95%(at40°C)(nocondensation)
Printhead 9pins
Life:100milliondots
Ribbon Fabricribboncartridge
Life:1milliondraftcharacters
Option Automaticsheetfeeder
Serial-Parallelconverter(SPC-8K)
Pain
Interface Centronics-compatible
Synchronization Byexternalsuppliedstrobepulses
Handshaking ByACKor BUSYsignals %
Logiclevel I
Connector I57-30360Am~henol I
Fig. 1-1ExternalDimensions
–4-

I
GENERAL SPECIFICATIONS
2.
2External Appearance and Composition
NPPC
R C
BL
/L
‘C
“a’enK
PM
-
IC
Fig. 1-2FrontViewofthePrinter
aL
Fig.1-3DiagramofInternalComposition
-5-

GENERAL SPECIFICATIONS
2S S
/\
I1
DS1/O
DS2
Fig. 1-4TheDIPSwitchesarelocatedunderthePrinterCover
1) ExceptforRussianversion
Switch Function ON OFF
1-1 Printermode Standard IBM
I1-2 IUsageofRAM IBuffer IDownload
1-3 AutoLF No Yes
1-4 Autosheetfeeder Inactive Active
1-5 Pawr-outdetector Enabled Disabled
\1-6 IOratorlowercase ISmallcam ILowercase
k1-7 Pagelength
1-8 (See right)
11Characterset
(Standardmode) ‘raphics ‘wlics
2-1 Characterset
(IBMmode) ‘et#2 Set#1
2-2
2-3 Internationalcharacterset (Seeright)
2-4
2) ForRussianversion
ISwitch \Function ION \OFF I
I1-1 IPrintermode IStandard IIBM I
1-2 UsageofRAM Buffer Download
1-3 AutoLF No Yes
I-4 Autosheetfeeder Inactive Active
I1-5 IParer-outdetector IEnabled IDisabled \
14 Character/Command
1-7 (Seeright)
1-8 PageLength 11inches 12inches
2-1 Characterset Set#1 Set#2
t---i
2-2 Codepage
2-3 (See right)
I2-4 INotused I I
Pl
Inc s
Country 2 2 2
U.S.A. ON ON ON
France OFF ON ON
Germany ON OFF ON
England OFF OFF ON
DenmarkI* ON ON OFF
Sweden OFF ON OFF
Italy ON OFF OFF
SpainIOFF OFF OFF
*Denmark/Norwaywhenswitc2-1is ON.
Ch
(s 1 io
Character/Command 1-6 1-7
Italiccancel ON ON
Italicselect OFF ON
MSBnotcontrol ON OFF
MSB=l OFF OFF
Cp
Codepage 2-2 2-3
‘R1%---wl
1I
#3840IBM-Russian OFF ON
Gost IOFF /OFF I
-

2
1)
2) Atoffline
HHold
tl Push
SpfSp p
Agingmode
Rm
Forwardm
F
w
*1 In thecaseofRussianversion,“ORATOR”fontiseliminated.
–7–

GSPECIFICATIONS
3. Parallel interface
3-1.GeneralSpecifications
Item Specifications
SynchronizationSystem ViaexternallysuppliedSTROBEpulse
I/FProtocol ByACKandBUSYsignals
ILogicLevel ICompatiblewithTTLlevel I
ACK
9~s
‘“d ~
STOROBE
hT
Busy 1+
T: More than().5 ILS
Fig. 1-5TimingChartsofParallelInterface
3-2. ConnectorSignals
PinNo SignalName FunctionDescription
1STROBE Goesfromhighto low(for>0.5ps)whenactive
2DATA1 Highwhenactive
3DATA2 Highwhenactive
4DATA3 Highwhenactive
5DATA4 Highwhenactive
6DATA5 Highwhenactive
7DATA6 Highwhenactive
8DATA7 Highwhenactive
9DATA8 Highwhenactive
10 ACK 9VSlowpulseacknowledgesreceiptofdata
11 BUSY Lowwhenprinterreadytoreceivedata.
12 PAPER Highwhenpaperout.Canbe disabledwithDIPswitchsetting.
13 SELECT Highwhenprinterison-line
14,15 NC
16 SIGNALGND Signalground
17 CHASSISGND Chassisground(isolatedfromsignalground)
18 +5V +5VDCoutputfromprinter
19-30 GND Twistedpairgroundreturn
31 RESET Whenthisinputsignalislow,printerisreset
32 ERROR Outputs lowwhenprintercannotcontinue,dueto anerror
33 EXTGND Externalground
34,35 NC
36 SELECTIN Alwayshigh
-8–

GENERAL SPECIFICATIONS
Serial Interface (option)
Whenusingtheserialinterface,theoptionalSerial-PmallelConvertermustbeconnectedwiththeprinter.
4-1. GeSpe
Item Specifications
Interface RS-232Clevel
SynchronizationSystem Asynchronous
Baudrate 150-19,200 bitpersecond(BPS)[selectable]
150,300,600>1200,2400,4800,9600, 19200BPS
Wordlength
Startbit: 1bit
Databit: 7or8bits(selectable)
Paritybit: Odd,EvenorNone(selectable)
Stopbit: Morethen 1bitlength
Signalpolarity
Mark: Logic“l” (-3V to-15V)
Space: Logic“O”(+3Vto+15V)
Handshaking DTR
XON/xOFF
ETX/ACK
Databuffer 8KB(standard)
4-2. Connector Signals and Functional Descriptions
IPin No. \Signal name IDirection Function
1GND —Printer’schassisground.
2TXD OUT Thispincarriesdaiafromtheprinter.
3RXD IN Thispincarriesdatatotheprinter.
4RTS OUT Alwaysspace.
Thispinisspacewhenthecomputerisreadyto senddata.
5CTS .Thisprinterdoesnotcheckthispin.
6NC Unused.
7GND —Signalground.
8-10 NC Unused.
11 Thisprinterturnsthispinspacewhenitisreadymreceivedata.
RCH OUT Thislinecarriesthesamesignalaspin20.
12– 19 NC Unused.
20 DTR OUT Theprinterturnsthispinspacewhenitisreadytoreceivedata.
21–25 NC Unused.
–9–

GENERAL SPECIFICATIONS
4-3. DIP Switch Settings
ISwitch ON OFF
1 8databits 7databits
2Noparity Paritychecked
3Handshakingprotocols-seetablebelow
4
5Oddparity Evenparity
6
7Datatransferrate–seetablebelow
8
AllswitchedaresetON whentheprinterleavesthefactory.
Protocol Switch 3Switch 4
DTRmode ON ON
IXON/XOFFmode ION IOFF I
IETX/ACKmode IOFF ION I
Baud rate Switch 6Switch 7Switch 8I
150 OFF OFF OFF I
300 OFF OFF ON
600 OFF ON OFF
I1200 \OFF ION ION I
2400 ON OFF OFF 1
4800 ON OFF ON
9600 ON ON OFF
I19200 ION ION ION I
–10 –

C2
TO
1. BDi
.....................................................................................................1
MLB................................................................................................1
2DIOp
.............................................................................................1
2PaIn
................................................................................................1
2SIn
...................................................................................................1
2GeFC...............................................................................................1
2Ed........................................................................................9
2PH D C .................................................................................1
2PHTeDeC......................................................1
2CaMD C .........................................................................20
2-2-5. CaMSC.........................................................................2
2-2-6.PFMD C ....................................................................2
2RCi
..........................................................................................................2
2Rb+LVDe
..................................................................2
2PrCi
..................................................................................................2
3P S U..............................................................................................2
4Me
.........................................................................................................2
4-1. PHMe
..........................................................................................2
4PHCaMe
..........................................................................2
4IRFMe
................................................................................2
4PFMe
........................................................................................2
4De
................................................................................................................30
l

I

I
THEORY OF OPERATION
1. Block Diagram
Theblockdiagramofthisprinteris showninFig.2-1.
DaLa
(From Host Comp.tcr)
8
[
+}; 7.~
Printer
Mechamsm
~-———.
IAutomat,c ~
Parallel Driver ~SheetFeederl
Interface .——— —.
Control Gate Array Print Head
Panel
DIP ~ju~ Detectors
Switch
!’
EPROM Driver 4Carriage
64 KB Motor 1
RAM Paper Feed
Motor
I
Main Logic Board Power s
Unit (
AC Power
Fig.2-1BlockDiagram
(1) MainLogicBoard
ThisboardreceivesdatafromthehostcomputerandstoresitintheRAMintheorderofarrival.TheCPUonthis
boardreadsthedatafromtheRAM,andeditsitaccordingtotheprogramstoredin theROM.
Whentheeditingiscompleted,variousdrivesignalsfromtheCPUare senttotheprintermechanismto perform
printing.
<Explanation>
1
2
3
4
5
6
7
CPUM50734SP
●Controlsthisprinter.
EPROMP.PD27C51264K-byte
.Containstheprogramwhichexecutescontrolof theprinter.
RAMHM62648K-byte
●Usedas stackarea,workareaanddatabufferof theCPU.
Parallelinterface
Gatearray(customIC)
.Inputsoroutputsseveralsignals.
Driver
●Thedataeditedby theCPUandgatearrayaresenttotheprintermechanismafterconversiontothesignal
fortheprintheaddrive,carriagemotordriveandpaperfeedmotordriverespectively.
ControlPanelBoard
.Thispanelcircuitis formanualoperationof theprinter.
(2) PrinterMechanism
Theprintermechanismconsistsofaprinthead,carriagemotor,paperfeedmotoranddetectors.
(3) PowerSupplyUnit
ACpowerisconvertedto 25VDCand5VDC.
– 13–

THEORY OF OPERATION
2. Main Logic Board
IO
2-1-1. PaIn
Communicationsbetweenthehostcomputerandthisprinterarefacilitatedviaparallelconnectors.Thissectionexplains
thehandshakeof thisinterface.
Thedatainputcircuitof thisinterfaceisshowninFig.2-2.
CNI
1- ~————————————————————,
DATA1IDINO]LS273 LS244 ;DO
rDO
(1
II
1rI
IDQ AY
I1
II
I[
DATA8DIN 7\CLK iD7
ii -D7
IA
@+5V != ~
—1
STBII
STROBE I
I
BUSY I
I
II
IQI
II
ACK Il—
IWR Iii
I
GateArray ICPU
L————————— — — — — —— ——— ———— IL
Fig.2-2DataInputCircuitwithParallelInterface
Thefollowingisan explanationof thishandshake.
(1)
(2)
(3)
(4)
(5)
WhentheBUSYsignalisLOW(Ready),thehostcomputer outputs 8-bitdata 1through8totheconnectorCN1.
Pin 1carriestheS&OBE pulsesignd-hm thehost~mputer &theprinter.ThissignalisnormalIyheldHIGH
bythehostcomputer.Whenthehostcomputerhasdatareadyfortheprinter,itsetsthissignaltoLOWforatleast
0.5p.s.
Thegatearrayofthemainlogicboardreadsdata1through8atthetimeofSTROBEsignalfall,andthenturnsthe
BUSYsignalandP-BUSYsignaltoLOW.
WhentheBUSYsignalofthegatearrayissettoLOW,theBUSYsignalofconnectorCNlwillbeturnedtoHIGH,
notifyingthehostcomputerthatdatacannotbeaccepted.
TheCPUisinformedviatheDOdatalinethattheP-BUSYsignalisLOW.TheCPUthensettheRDsignaltoLOW
andreadthedata.
Uponcompletionofthedatareading,theCPUnotifiesthehostcomputerofthedatareceivablestatebysettingthe
BUSYsignalofconrtectorCNIandtheACKsignaltoLOW.Thisconcludestheexpkmationoftheparallelinterface
handshake.Thefollowingchartshowsthetimingchartof thehandshake.
–14 –

THEORY OF OPERATION
““K u
w
9
D)
I
STOROBE J-Ill TT
-i
BUSY IIMt (
Fig.2-3TimingChartof ParallelInterface
2-Ser(o
Whentheserialinterfaceis used,an optionalSerial-ParallelConverterisrequiredto be installed.Theconverterwill
changethevoltagelevel(RS-232C~TTL)andthedatatransfermethod(Serial~parallel).
C1C B
IR
R,I4
1TT
TI
1
T=
P50 D
P,D
PD
PD
P,
PD
PD
P,D
$-
PS
P
P1
I
I
PI
PB
P
II
M
Fig.2-4SerialInterface(intheSeriai-ParaiielConverter)
–15-

THEORY OF OPERATION
TheIC101isadualRS-232Cdriver/receiverwhichincludesacapacitivevoltagegeneratortosupplyRS-232Cvoltage
levelsfromasingle5Vsupply.
DatafromthehostcomputerissentfromRXDviaICIOlandisinputtotheMPU.SerialdatainputtotheMPUisconverted
intoparalleldata,andoutputtothemainlogicboard.Conversely,paralleldatareceivedbytheMPUisconvertedthere
intoserialdata,andoutputtotheTXDterminalviaIC101.
TheCTSterminalis hardware-connected,notsoftware-connected.(Thissignalisnotchecked.)
Thisprinteremploys3differenttransfermethods,whichcanbe selectedusingthedip switches.(Referto Chapter1,
4-3
(1)
(2)
(3)
SettingDip Switches)
DTRmethod
TheDTRsignalisconsideredaBUSYsignalatthehandshake,andwhenthedatabuffercapacityis256bytesor
less,theDTRsignalisgivenamarkedstatus,meaningitcannotreceivedata.Whenthecapacityofthedatabuffer
increasesto512bytesor moreduringprinting,theDTRsignalisgivenaspacestatus,whichindicatesthatitcan
receivedata.
XoN/Xommethod
Whenahandshakeiscarriedoutwiththehostcomputer,theXoN/Xommethodmakesuseof ASCIIcodes(DCl
andDC3).(DCl andDC3arecalledXONandXom,respectively.)Whentheprinterbufferisfull,DC3(ASCIIcode
19)isoutputtotheTXDterminal,andthecomputerreceivesarequesttostopdatatransfer.ThepnnteroutputsDC3
untilit(thecomputer)stopsdatatransfer.Duringprinting,whenthebufferfullstatusiscancelledanddatacanbe
received,DC1(ASCIIcode17)isoutputtotheTXDterminal.WhenDC1isoutputfromtheprinter,thecomputer
followsthedataformat,andbeginsdatatransfer.DatatransferwillcontinueuntilDC3isoutputagain.
ETX/ACKmethod
Thedatablockisconfiguredasshownbelow,buttheinitialSTXcodeisnotnecessary.WhenanSTXcodeissent
fromthehostcomputer,that1byteisignored.WhentheETXcodeisreceived,that1byteisnotregardedasdata,
anACKorNACKcodeissenttotheTXDterminal,andthehostcomputerisinformedthatdatareceptionhasbeen
completed.
Datablockform:
STX DATA(8KBorless) ETX
+(
—
(
D B
Sstop
BI?3 4 56 7 (B
—
101
—1---
0,;
–-+ I
I
Fig. 2-5DataFormat
–16 –