Digital Equipment DECwriter Correspondent Technical Manual Download

Page: 123 / 171

Summary of Contents for DECwriter Correspondent

Page 1: ...I DECwriter C oirir e s pondent Technical I M anua I Prepared by Educational Services Of Digit a I Equipment co rpo ration...

Page 2: ...HS VT Work Pr oc es sor CHA PTER l Ll 1 2 1 2 l 1 2 2 1 2 3 l 2 4 1 3 1 4 Cf AM ZR 2 2 1 2 2 2 3 2 4 2 5 2 5 1 2 5 l l 2 s 1 2 2 5 2 2 5 3 2 5 4 2 5 4 l 2 5 4 2 2 6 2 6 l 2 1 6 2 2 6 3 2 6 4 2 6 5 2 7...

Page 3: ...3 1 3 1 3 3 3 4 3 6 3 7 3 10 3 12 3 12 3 14 3 1 4 3 14 3 16 3 18 3 20 3 22 3 24 3 27 3 27 3 3 0 3 31 3 3 2 3 34 3 34 3 34 3 3 6 3 37 3 39 3 4 0 3 4 0 3 40 3 45 3 4 6 3 4 6 3 47 4 l 4 1 4 2 4 4 4 5 4...

Page 4: ...0 5 Wavefo r Jfl of Good D r iv er and T rans ist or vi 1 3 1 4 l 5 2 2 2 3 3 2 3 4 j 6 3 8 3 11 3 12 3 13 3 15 3 17 3 1 8 3 21 3 22 3 23 3 24 3 25 3 27 3 29 3 30 3 31 3 32 3 34 3 35 3 37 3 39 3 42 3...

Page 5: ...Fa olts S i ng l e Ch ar acte r Faul t s EU Analog Loo pback Self Test Faults DCM Analog Loopback Self T est iFa ul ts DCM iR emote oat a Loopback Self Test Faults Acoostic Cou pl ed Modem Self Test F...

Page 6: ...Paragraph 1 3 The manual is divided into the following chapters Chapter l Chapt er 2 Chapter 3 General Description Provides an overview of the terminal an introd uction to its physical and functional...

Page 7: ...bapt er 5 tsech ani c a l Se r vic in g Prov ides the rem oval and r e p1 a cement procedures for al 1 field repl ac eable units FRUs A p pendi A Esc a pe Se quence Summary Prov id es a summary of the...

Page 8: ...0 baud normal text without fill characters The maximum print rate is 150 characters per second There are four Correspondent models Model A Model B Model C Model D Keyboard send rec eive KSR termin itl...

Page 9: ...haracter it is sent to the printer mechanics via the microprocessor control bus on the logic board The terminal then prints the character if it i s a printable character or performs the specified moti...

Page 10: ...OUTPUT TO HOS 8C22 A NULL MOD EM CABLE SERIAL DATA ECHOED FROM HOST Hf SYSTEM HAS HOST FEATURE fNCLUOEOI WHEN USED AS AN INPUT DEVICE BC22 A NULL MODEM CABLE SERIAL DATASENT FROM HOST bl WHEN USED AS...

Page 11: ...I CORRESPONDENT COMM LOGIC K EYBOARO LOGIC SOARD YES PRINT OR MOTION NO CHARACTER CTRL CHARACTER PROCESSING LOG IC Figure 1 2 Local Mode 1 3 PRINTER MECHANICS PRINT CHARACTER OR PERfORM MOTION FUNCTI...

Page 12: ...t can also print the fol lowi ng character sets USASCII United Ki ngdom French Canada Germany Sweden France Finland Norway Denmark Spai n Italy APL Line Drawi ng VTl0 0 1 2 3 Ribbon Cartridge A dispos...

Page 13: ...YBOA f1D 1 MECHANICS CHARACTER FUNC flON OR CHA AACTE A I I YES FROM COMPUT EA CHARACTER CONTROL 1 1 I PROCESSING I LOGIC L l N LOCAL ECHO KEYBOARD CHARACTER IS P RINTED ON TERMINAL AND ISSENT TO COMP...

Page 14: ...HONE OUTLET EIA J ACOUSTIC COUPLER 20rnA fOPTIONALJ LOGIC aOARO INTEGRAL MODEM 80ARD KEYBOARD POWER SUPPLY PRINT HEAD LINEFHDM0TOR ENCODER ASSEMBLY Figur e l 4 DECwr i tee Correspond ent Diagram 1 5 1...

Page 15: ...e Programmer Refer ence Manual DECwriter Correspon d ent Iristalla tion Guide DEC ri 1 ter Corr es ponden t Operator and P rogrammer Re fe rence Cards D Cwri ter Correspondent Pr o Jrammer Refer ence...

Page 16: ...we t 0 bulb temperatur e of 28 c 82 g and 0 a minimum dew point of 2 C 36 F noncondensi ng 5 to 95 percent noncondensing PAPER SPECIFICATIONS Roll feed single sheet Width Weight Sing le part Optional...

Page 17: ...d 2400 baud r eceive 300 baud send 4800 baud recei e 600 baud send 2400 baud r cce ive 600 baud send 4800 baud receive 7 or 8 bit ASCII serial asynchronous Even odd or none e i g hth bit set to mark o...

Page 18: ...t iption of SET UP includes the st tUs message printout and the following features which can be configured for a specific system application Communications features Keyboard features Pr inter features...

Page 19: ...al to match ac input voltage The position labeled 1 turns power on The position labeled 0 turns power off Reposition or remove friction fe ed paper from terminal Holds paper against the platen during...

Page 20: ...RIBBON ADJUST KNOB Figur e 2 1 Termi nal Controls 2 2 PRINTHE AO ADJUSTMENT LEVER 1151220V VOLTAGE SELECTOR POWER ON OFF SWITCH llOl MA Of l l J 8 3...

Page 21: ...I I I I 10 15 I I I I I I I I I I 15 20 Rt SO TJ ST 0 0 I I 15 20 I 1 I I I I I I I I 20 25 I I I I I I I I I I I I I I 25 30 I I I I 1 I I I I I I I I I I I I I I I 25 30 35 40 KEYPAD LINE SET UP POW...

Page 22: ...IBOARD CEYS The keyb oard is arranged like a standard office typewriter but also includes special function keys and an embedded keypad for rapid ent r y of numeric data 2 4 Table 2 3 Bell Tone Indicat...

Page 23: ...embedded keypad keys are marked by squares i n the upper left corner The squares contain the digits 0 through 9 1 and signs Y ou can select this feature by pressing the RUM ICBY ltOD E key KEYPAD ind...

Page 24: ...o can select certain features o meet the requirements of a particular installation 2 S 4 1 Entering SET UP To enter SET UP follow these steps l Press the CTRL key 2 Press and release the SET U P key 3...

Page 25: ...edures to select them Table 2 5 Form Features Function Set tabs Clear tabs Clear all tabs Top of form TOE Margin left top Marg i n right bottom Marg in c lear Status Recal 1 sto re Vernier paper posit...

Page 26: ...werback Type up to 30 characters Ends the message Store message cm t if not desir ed Causes terminal to automat ical i y transmit answerback messa 3e when c ommunication connection is e s tabl i shed...

Page 27: ...ot ion r es lll ties a fte r paper supply is restored and VU W f AULT lt ESET is pressed 1 dw 11 I i j Table 2 6 Communicatioris Features Cont Feature Procedure Procedure Enter SET UP Press CF RETURN...

Page 28: ...ve 390 aud s e od 2400 baud receivP 00 baud send 4800 b 1ud r ecei v e 600 baud send 2 400 ba ud r ec i ve 600 baud seod 4800 baud r ece i ve NOTIS To ae t low baud r te aubstitute key to r H key Tab...

Page 29: ...restraint control Se lects both XOFF XON and SRTS l in0 f o r r e straint control Selec ts control charactt r t o turn l inP aro und from compute r contro l to t e rminal con r ol o r vice versa 2 18...

Page 30: ...hort break or 3 8 seconds long break Short break is gen rated by pressing BREAK long break is generated by holding down SHIFT and pressing BREAK This feature does not affect terminal response to a fau...

Page 31: ...UP to select this featu e Procedure Hold CTRL down and press VIEW FAULT RESET en release both keys 2 6 S Printer Features Description This feature allows the operator to see the last character printed...

Page 32: ...T UP Press PE RETURN Enter one command PE A RETURN PE B RETURN Control Character Printing Procedure Enter SET UP Press PG RETURN Enter one command PG A RETURN p G B RETURN Horizontal Pitch Description...

Page 33: ...which printing occurs Sets l eft margin at present column Pr i nthead advances to horizonta l t b s t op ttor i zontal tab is cl are d Table 2 8 Printer Features Cont Feature Procedure Clear All Hori...

Page 34: ...Prints current form length value Substitute the form length in inches times 2 4 for n Represents top edge of the paper not to be C Onf used with the top m arg in To avoid losing top of form setting p...

Page 35: ...SET UP Press LOC FF LOC LF to advance papeI to desi r ed l i e H ld down SHIFT and press 6 New Line Request Character Procedure Enter SiET U I Pr ess PN RETURN Enter one command PN A RETURN PN B RETU...

Page 36: ...rminal is tur ed off and on a nd no fe t ur s are t red in user permanent memot y r the features 1n operating memory are replaced with the features in default memory 2 7 2 User Permanent Memory The us...

Page 37: ...y NOTE An alternate aet bod is t o p r ess S ET UP dur i ng 1 power up seque nce pr ocedur e En ter S ET JP Pr ess I RfflJ N Table 2 10 F eature Default Val ues Feature Communications Auto Answerback...

Page 38: ...sequences The foUc wing chart describes these cbaract e rs and escape sequences generated by the 1 s keys o n the keypad ib t ernal tteypad ttey PPl PP2 Pfl pp 4 1 R c omma dasbl ipe r i od I l 2 3 5...

Page 39: ...rdc opy terminal It includes six basic components not including the enclosure The components are the logic board keyboard printer mechanism integral direct connect modem acoustic co upler and power su...

Page 40: ...ORY 3K RAM UNCtuDES RfCElVE euff ER 30011200 INTEGRAL MODEM L BWIASERIAL ffECEWER ANO T RANSMITTER c L INc E c cfE E O a ST E P _ _ i BE L L COMMANO 2 5 MS INTERRUPT BAUD RATE SELECT BAUD RATE CLOCKS...

Page 41: ...des the following components 9 wire printhe ad Servo motor position encoder for horizontal printhead motion position sensing Stepper motor for vertical pap r movement Paper out sensor Platen bail bar...

Page 42: ...OOCII iC t p c O Oll l II suwo Oitl i c 1 I H V Fig ur e 3 2 It first determines where t he pr inthead is and calculates wher e the printhead has to move to as a r esult of the control character being...

Page 43: ...CTER RE_CEl lcR SHUAL _llNc 8251A USART PARALLEL CHAR 8AUORAT E CLOCKS Data Flow for R ecei ved Charac t e MICRO PROCESSOR ROM INPUT BUFFE R RAM INPUT BUHE R SERVO L OOP DCJOS i CONTROLLER _ OR tVER E...

Page 44: ...0 3 4 s 6 1 8 9 I j 1 J 1 t J 1 I I I I I y INITIAL SECO ND T HIRO fOURTri l OAO LOAD LOAD LOAD Y A 11t JA8l Dot COlumo Tr a nsfe r Exampl e...

Page 45: ...acoust i c coupl er modem Keyboard Printing process Pai er adva nce process Power su ppl y and power distribution Nonv olat ile memory 3 3 3 Hi crqproceasor Contr l Syatea An 9085 A micr oprocessor is...

Page 46: ...W PA RALLH Ct AAA CTf11 COLUMN SC AN CHAR M ICRO t EV SOAt O LOGIC PROCESSOR C ROMANO OUTP llT 8UHER t i USART TOCOMM IC 0 LINE w 0 0 RAM ex a SEffY Q LOOP ENCODER 1 OC 305 OAIYEfl COtffROLi f R SERVO...

Page 47: ...E alSUfffR 11 WHflt BUH ROMCHl0 SEl 1 KBO NVM L 0305SL 8151l EN MINUSH E N 1 PJ USH ACSTANSL CAL OHOL ACST SEL L EUR DOMH LIN LOC NKEYPAOH iETUP L J CST H fH N L REC LS 0 H CU i TS H OAT A S fUi OTR H...

Page 48: ...if er a b les mes1u u y tROH RAMi and o the r dev ices addressed as aae oxy such as t be 8251 A USART and the OCll S prin t er c ont roll er When high 10 M en ble I 0 devices The I 0 de i ces in the...

Page 49: ...ccurs ever y 2 5 ms The fl i gbt t iai e coz tceetio l1 i1i t h e time f r om wtien t tJe w ire mo ves as a l d JH o f t h e activ tion of t h a arimature olenot d imtil the dot pr n tcs on t he p per...

Page 50: ...1 FEE D 1 PAOC l DOT LIMIT I CHECKING I___ lfLT TIME CORR I SERVO CONTROL LINE IFEE D 1 PROC CQMMUNICAT10NS I SIG NAl 1 CONTRO 1 1 1 FLT TIME CORR SE R V O CONTROL J l INE f 1 EEO PRO 0OMMUN ICAnor s...

Page 51: ...ice routine g ets the next character and modifies the interrupt vector depending on whether there is a printable character end of line or skip If the character is printable and the cover is closed the...

Page 52: ...CE ROUTINE MA 061683 Figure 3 6 Receiver Interrupt Flow Diagram 3 12 FIFO fMPTY NO NO Figure 3 7 INTERRUPT VECTOR DOT FIFO INTERRUPT SERVICE ROUTINE EXAMINE DOT COLUMN COUNT DOT COLUMNS iO DC305 DECRE...

Page 53: ...nd supporting logic The USART translates between parallel and serial data formats adding or removing start and stop bits as needed 3 3 5 1 Data Por at The Corr espondent only communicates asynchronous...

Page 54: ...A MSB s TOP I BIT BITS BITS I 47 K rT T SPACE ILl 1 l l l i i IlJ j 3 3ms 1 START r LS B BtT 9 7ml 8 PARITY DATA MSB B ITS 1 I STOP BIT 1 MARK i ifTTT rTTT1 1 SPACE f _ __ _ 1 1 1 I __ 1 __ __ f ae s...

Page 55: ...support the desired cqamuni atio1 ns for1Dat After the USART is pr og r amm ed it is ready to 1 petf orm its communlc tions functions Fi gure 3 9 shows how data is ban led acr oss the serial line and...

Page 56: ...TE0 I fPARALLELI i RAM OUTPUT BUFFER i t1 TRAH SMIT DAT A 2 ND 8Uff ER t CLOCK i tl251A USART R SY6 ____________ t RX OY l RECEUf R f LAGI A07 AOO 8 8 SA iUl O PAOCES SOR 1 PAT HOf I CAARAC fE R 1 I R...

Page 57: ...r equency div ide r to scale the CtlC B i nput down t o Uie correct baud t ate cl o cJk ll U LiA t A M LIK IP t t t t wr TlilP u tII ___ Cl lO fi Y II LI ti o IJJ 1 Based on the selected baud rate thr...

Page 58: ...BOBSA MICRO f 1 0CESSOA A07A 00 Fi9ure 3 1 Creating Baud Rate Clocks l 18 fBAUO RATf COMM ANO DC305 PRINT CO NTROU ER R XC 16 OR 54 82 il A USART Ct K TO RCVR BUf t CLK TCJXMIT BUF 2...

Page 59: ...f 7 lfUlDfCD CF 1 1 9 DTR Ct Ute 2 Dat a Lead onl y Act ive Ac t i Ye Ofli 3 Aa ti ve lna tiv e lnac ti ve A c t ive Nodem Control ii c t i v e Ac t iv e On Ac t ive Ac tive Ac ti ve A c t i ve Of f...

Page 60: ...INl ICAU SPOIi 12 0 r 10 RCVA R CEWEO UN E B Ql r co_ 1 r_ L_ J SJ it Al OET ISClI CA R R1EA J F TECT fftI SO1f 0 A07 ADO t U Xf nl ir TERfACE CONNECTOR OUTPUTS SPEED INDICATE o23 SPDU o W DATA Te R m...

Page 61: ...generating an RST6 S inter rupt f i gure 3 1 3 s hews t e transmit cha ractei processing routine entered vhen the lt i croprocessor yants to send a character out tc t he u 3 1 f tT 1tcc11 vro Cl4AllC...

Page 62: ...ve ChDracte r Pr ocessing Routine 3 22 ADD DATA TO TOP OF INPUT BUFFER EXIT NO SET DISCONNECT OR TURN AROUND HAG ENTER DATA l IOUTPUT BUFFER FROM KE YBOARO OR ANSWERB CK PUT C ARACTE k IN INPUT BUFFER...

Page 63: ...EE POLLOW NG FRAME S DATA fJllS AOOH SS 1 7 00 S DJ Ol 0 1 HEX EXHRNAt EMOTE KE PAO 8XXO NVIIM 1 CAPS z TAB SC IOCK 8XXI NVRAP I CAPS I A 0 LOCK 8XX1 NVRAM CAP C s w LOCK 8XX3 NVRAM CAPS PF4 Pn V D E...

Page 64: ...AD7AD0 AlS A0 COLUMN DECODER DRIVER COLUMN NCOL 0 4 1 Nol 1 4 1 3 ___ l l P a JOl J L li 131 J C_A_PS_ _L_O_C_K ______ t l Sl 1 NVM OA F ROMMEMORY L________J Figure 3 14 Keyboard Logic 3 24 EXTERNAL N...

Page 65: ...2 3 s 4 5 A 6 7 8 I 9 l 0 NUM KEY MOOE HERE 1S LINE LOCAL LOC FF LOC Lf ur u sEo NOTES 1 THE APPEARANCE OF A t fN A OATA BIT SIGNIFIES KEY CONTACT fS CLOSED 2 EACH NTRY DATA BIT ADDRESS IS ACTUALLY T...

Page 66: ...key and is not reentered Hore than one key can be down and accepted This is called key rollover Normally the Correspondent accepts 3 key rollover If the keys were pre ssed du ring different keyboard...

Page 67: ...PATH __ _ ____ ____ RB TII V ii I I _ t 1N t RC G ll APPARENT CURRENT SNEAK PATH ROW SCANNIHG ORDER COLUMN 5 ROW 8 COLUMN s ROW C COLUMN 6 ROW 8 COLUM 6 ROW C CHAR ACTE RSENSED T G fA t SE 4TH KEYi y...

Page 68: ...acter Thi incl ude s a Star t P r i nt command to i nit iali ze the process and a Servo s peed Oi r ectio n comm and Serv o spe ed depends on the hori zontal char acter p i tcb elected A pt si tion en...

Page 69: ...COMMiA OS ii I DOT DATA BYTlES I I DOT DATtA INT ERRl PT DOT DATA SlLO CONTROL BYTES DIREcnoN 1 it 1 SPEED REGISTE RS ACCElfJ iATlONI POSITtON a vt1E S POSrt1 tON VE LiOC fVI _ 1 1 RfGtSTERS MA RGtN 1...

Page 70: ...the output of the other channel by 90 degrees Therefore their binary states change in quadrature to each other 00 01 11 UJ 00 as the carriage moves The CHl and CH2 position signals enter the DC305 wh...

Page 71: ...LUS PLUS DRIVER MINUS 21V rS V l 1 1 1 J2 1 11 I ENCODER SERVO MOTOR L___ ___ ___J Figure 3 18 Servo Head Positioning Logic 8085 A MICRO P ROCESSOH CONTRO L FUNCnON OOTOATA DOT DATA IUTE R RUPT VECTOR...

Page 72: ...1 s 0 0 0 0 The four driver outputs LFl to LF4 connect to the stepper motor through J3 At any given time two of the four outputs are always driving current through two of the four stepper motor windi...

Page 73: ...ROL FUNCTION CONTROL AO7AO0 INTR OC305 PRINTER CONTROLLER RUN LF2 ____J PLATEN ASSEMBLY Fi gure 3 20 Paper Feed Subsystem Logic 3 32 LFl LF2 PAPER FRICTION ASSEMBLY 21V CURRENT LF COM SWITCH LF4 LF 1...

Page 74: ...switch mode power supply The following i s a list of the input output specifications fot the H783 9 lnpQt 90 Vac to 128 Vac 4 7 Hz to 6 3 Hz at l 5 A 174 vac to 256 vac 47 Hz to 63 Hz at 0 75 A 90 W...

Page 75: ...on 115 220 VACIN rfu 1 m LINE FILTER VOLTAGE SELECTION SWITCH MATs R IX 115 220 INPUT SECTIO __ VOLTAGE DOUBLER 23 220V L RECTIFICATION FILTERING AND CURRENT L SENSE L 01 CURRi NT SWITCH DUTY CYCLEI 2...

Page 76: ...therwise have t o be reen t ered every time power was turned on or else stored in mechanical switches Al though the microprocessor sets up initial conditions by using the specifi c ations in the NVRAM...

Page 77: ...MORY ARRAY 10 BfTS U NS ADDRESS 100 X 14 ADDRESS DECODE CLOCK CLOCK G E N UNJTS ADDRESS lO BITS Figure 3 23 ER14 00 NVRAP1 Blc it Diagram 3 37 14 e 1 0 BUFFER _READ MOOE WRITE DECODE ERASE LOGIC DATA...

Page 78: ...ts and functions for example keyboard printing and communication When the read oc write cycle is complete the microprocessor reactivates or enables al l interrupts and functions In the read cycle the...

Page 79: ...OOS t SHIFT OATAOUT ouTPUJ OATACHM IGE SON Tti_ EPOSITIVE GOING Cl OCK DGE OATAA DAOD RE SSI NPUTSARE SHlfTEDON fffE ti tGA1 1 Vf OC tr i CLOCKrf DGE Plg1 u e 3 2 NVAAflil Timing Diagrams 3 39 WRITE C...

Page 80: ...nd timing circuits needed for oper a ti o n 3 40 Automatic Answer Node Refer to Figure 3 25 The automatic answer mode depending on the presence of DTR starts when a ring signal 21 Hz is applied to the...

Page 81: ...ICATOR SWITCH HOOK 15 OFF HOOK I_ T _A TAU SWffCH J CORRESPONDENT LOGIC J8 1 5 SWIT CH SHOWN IN DATA POSfflON CUPI BOARD Off HOOK DRIVE 10 11 20 _ TEST INDICATE 7 7 E SPSL MOO _ 1 TEST MODE G J o SP E...

Page 82: ...0 __4 _ 94 DETECT R RJNG INDICATOR P t SWITCH HOOK 1 _________________________ t g LC RD fESTMODE SPEED SEt ECl MODEM DATA TERMINAl READY 1 OATA SET READY SPE1 EO INOJCATE ml TRANSMJT DATA 11 I ______...

Page 83: ...mmediately SH is held low for greater than 20 ms by an RC time constant This change is coupled to the modem chips where LCRD is generated The LCRD signal is coupled to the TLI as off hook activating t...

Page 84: ...erated from the printhead in the printer The electric microphone in the receive section of the coupler converts the audio signals on the telephone line into electrical information for the modem The in...

Page 85: ...0 2 mA OFF SPACE 0 18 50mA ON MARK 1 50mA _________ MARK 18mA _________ 10 mA INDETERMINATE REGION 2mA _________ SPACE 0 mA__________ Figure 3 26 Interface States 3 46...

Page 86: ..._______ _ TO TERMINAL THRESHOLD RH1 A7 CD ALL 7 8 E19 E7 1 8 TR NSMIT FILTER E7 2dlJ DETECTOR EUROPEAN DOMESTIC L 4 6 SWITCH E6 MODEM 14 A2 EUR OOM H ChlP 4 MC14412VL a 1MHzCLK 1_1 TRANSMIT DATA TTL L...

Page 87: ...s automatically when the terminal is turned on It provides an initial isual indication of terminal operation Paragraph 4 2 2 You can run the other tests from the keyboard to furthe test terminal opera...

Page 88: ...is test pr int s any selected character cont ir uously The nonpr i nting test prints spaces but does not slew TL X 0 123456789 AB DEFGHIJKLMNOPQRSTUUWXVZ J 1 t 1234S6789 9ABCDEFGHIJKLf INOPGRSTUIJIJXV...

Page 89: ...4 2 3 Printer Self Tests The printer self tests provide a visual indication that internal operation is 11ormal Procedure Enter SET UP NOT When typing elf teats do not insert any spaces A space is show...

Page 90: ...0 CONNECTOR TOPIN TOPIN 2 3 4 5 20 6 19 22 12 23 8 E IA MA 711641 Figure 4 4 EIA Loopback Connector...

Page 91: ...he three teats and reaain in SBT UP press any character key or the apace bar on tbe keyboard escept the S 1 UP key Remove EIA loopback connector The DSR CTS and RLSD indicators are off 4 2 4 2 Baud Ra...

Page 92: ...IIIlllUl IIUIIIIIIIIUllllllllllmllllllIIIIIIIIIIIIIIIIIIIIIIIIIIII EfA lOOPBACK CONNECTOR Figure 4 5 Inst all ing the EIA Loopback Connector f MA a736...

Page 93: ...est Procedure Exit SET UP Remove EIA loopback connector Comments Indications The SET UP ind icator stops f lashing The DSR CTS and RLSD indicators are off 4 2 S Integral Modem DCM Tests Perform any of...

Page 94: ...Enter SET UP Ente r al 1 co nm ands T R Enter one command RETURN Space bar or any character E xit SET UP C ents lndications The SET UP indicator flashes The TEST indicator is on The CTS indicator turn...

Page 95: ...p roba le t ield replace ab unit FRU that would cause that failu e Tbe symptoms dispiaied may represent more than one failure Therefore the symptoms ma y chap ge as the FRUs a2 e eplaced Always tro b...

Page 96: ...but car r iage mO li E S l nd icafo l s tu rn on and s ta y on POWER PJ ULT ir id icato r na shes no bell t o ne Probable Cause Keyboa rd cable Keyboar d assembly Logic board Logic board Access eover...

Page 97: ...NO E O GA N 11 C ESS fO p1tJ2 R fMOV E THE COVEA HOUSING 1s1 r PARAG RAP tt S SJ ORANGE 7 t V 8LACK GND 8L U 21 V BLACK GNO VtOLET l2V WHITE 12V VHLOW 24 V BLACK GNO RED 5V BLACK GND BLACK SAFETY GNO...

Page 98: ...orrect pa pe r installati on Replace printer mechanism Paragraph 5 15 Replace keyboard Paragraph 8 RPplace logic board Pa r ag r aph 5 18l on Table 4 2 Status Message and Printer Self Test Faults Cont...

Page 99: ...the printhead and J7 on the logic board Replace printhead Paragraph 5 2 Replace logic board Paragraph 5 18 Replace printhead Paragraph 5 2 Replace logic board Paragraph 5 18 Sel ect c orrect characte...

Page 100: ...th Replace printer mechanism Paragraph 5 15 Clean platen Ch eck for correct paper path Clear paper path Check that sprockets are in line on both tractors Remedy Set customer settings and store them Tu...

Page 101: ...2 RUN ANALOG LOOP TEST FOR USE RCOMM NO COMMUNICATE WITH HOST T ERMINAL O K Tr o uiblesbo ot i ng Flowchart EIACOMM PAR 4 2 4 DCM COMM PAR 4 2 5 ACM COMM PAR 4 2 6 E IA COMM TABLE 4 S t OCM COMM TABLE...

Page 102: ...5 18 Replace l ogic bo 3rd Paragraph 5 18J iRe11edy Re pl ac e modem board Pa r ag raph 5 ua Replace logic boa rd lParag r aph 5 18 Replace cable bet ween J 8 on log ie boar d a nd J 6 on modem bo u d...

Page 103: ...l cm t he l og i c b oa rd wi th a d i gital vol tmet er when under load Do no t u npl u g p1 f r oni t he logic t b oa rd when makin g these l ttt eur e ent If de vo l tage5 iu e not re c en t at J 1...

Page 104: ...INMGDU S A AWl ONt Y JJ KfY80AftD C OPT10tilAL WIT MODH S8 AND D OfRY 0 OP flQNA LW ll t t AU lllODf L S f tf CORRfSPONDE fl T tA S IA I THRU i YBOA RO 1 Of ACOUSTIC COUP HI IS CONNfC f O fO Jl Of H f...

Page 105: ...WO e i9n1a a t 11 4 1 Set Up th aco pe a bown in lFlgure 9 4 VOl 1 5 0 ERT CA l IV 0 S HPSPHO TRIG l Ol f A SQt AC i 1 C OPl l O Ot I 0 M 1At I I i CNA _ t DC P05 Figure 4 9 DC Wa k e Up Waveform Appl...

Page 106: ...120V RH 00 1 1 T EST POl N i PIN t B tUE PlN 2 lBUJE PIN 3 BL UE P Uli A tK iEV PfN5 3 FIOWN Pf N 6 BLUE P Jt J i 8L J E Pl 1 lH JUE PlN J i8 1 UE PIN 4 il f i PIN 5 BROW1 i Pl 6 BLUE VOLTA GES LIS r...

Page 107: ...l u NTR 8 A poei t br e got r g pul se wi th a pet l od of 2 S ffiS indicates t iote rrqt _ lu Oipet atin9 c o rr ec t ly Figure 4 lU rtonnect c b nnel l g if t t e co pe 1 0 29 U UiT I A n eg t t e 9...

Page 108: ...1 1100 or I CH t E23 cU C H2 E29 11 l RilGMOOE TRIG SOUR CE 01 PLAY MODE SWEl P SPEE D figur e 4 l l 1 2V GHIISION 2 l t DIVl ON NORMAL Cff X DC INT POS CHoPPE D 2ms DIVISION av CttANNEl 2 ov CH l i 4...

Page 109: ...out of phase with each otb r t _ J 1 i l I I I I I 1 j I l I I I I j f l i I I l I hi f ti I v JJ Yl fft t KJf 1 1 Ji t l Utt 11 11 WI tJkt IA L h H i fi f LHI lJ hl li I I u JU I ll In At JJ I A h1A...

Page 110: ...COPE SETUP CH1E438 CH2 E439 DISPLAY MOOE TRIG MODE TRIG SOURCE SWEEP SPEED I lV DIVISION 2v 0IvIsI0N CHOPPED NORMAL ov CHl DC iN NEG 0 1 ms1DIVISION 1A 0004 R Figure 4 14 DC Servo Motor Stepped Left t...

Page 111: ...7 Connect channel l of the scope to the defective solenoid channel of the DC305 E43 Set up the scope as shown in Figure 4 17 Apply power to the terminal Place the terminal in local mode Enter SET UP...

Page 112: ...oids 4 32 SCOPE SETUP CHl TRIG MODE TRIG SOURCE DISPlAY MOC SWEEP SPEED Figure 4 17 r SCOPE SETUP CH 1PNP OUTPUT CH 2 8241 OUTPUT TRIG MODE TRIG SOURCE DISPLAY MODE SWEEP P EO Figure 4 18 2V DIVISlON...

Page 113: ...I Figure 4 19 I I I II 11 i SCCPE Sf UP cu I Pl cl l U T9UT CH l ll U UUll UT TRIG MOOE I R G SOUAC DISPLAY Mo o r S FP SPHO I I I Figure 4 21 Waveform of Open PNP Transistor T I i I ov 01v1s1o t 10V...

Page 114: ...ecking the Solenoid Channels 4 34 SCOPE SETUP CH 1 PNP CH 2 2841 TRIG MOOE T RIG SOURCE OISPLAY MOOE SWEEPSPE EO Figure 4 19 SCOPE SETUP CH l PNP CH 2 2841 Ht1G MOOE TRfG SOURCE DISPLAY MODE SWEEP SPE...

Page 115: ...JfH i SOURCE DISPLAY MOD SWEEP SP HO 20V OV CHANNEL 1 20Y 20V ov CHANNEL 2 20Vla01VISION 20V OIV1S10N NORMAl 20V CH 2 DC INT NE G t rlOPPEO 0 2 ms OIVJSION A 0809 83 Waveform of Shorted PNP Transisto...

Page 116: ...E43 l 2 CLE 2 5 Apply power to the terminal and place it in local 6 Press the LINE FEED key and compare the waveform to Figure 4 24 They should be similar 7 Check each phase of the quadrature phase l...

Page 117: ...I SCOPE SETUP CH l E4313 CH 2 E4312 TRIG MODE TRIG SOURCE DISPLAY MOOE SWEEPSPHO Fig ur e i 24 l CH l CH2 TfhGMOO E lRIG SOURCE QtSfLA MOOE SWEE PSPHD r I I 5V DIVISION SV DIVISION NORMAL 5V ov ov CH...

Page 118: ...conttol let USt ft fJ ch i p l S et t he i PQw u oJa nu t c b t o 0 off 4 Apply power to the t erminal Perfo rm ao initializ e command in SET UP a Press CTRL SET UP b Press I REfilRN c Press CS B RET...

Page 119: ...CH l CH2 TRtG MOOE TRi G SOURCE DlsP LAY Mf OE SVlf fPSf En 0V CHANNE L 1 2y 0 1v1 0N 2f VlOtYlSION NORMAl CH 1 DC lNT Nf 6 CKOPPE 0 Sm1 0IVISION Line Feed lnput vs Output LF3 or LFO...

Page 120: ...8 14 signal RxRDY and change the scope triggering from NEG to POS Observe a high go i n g pulse ead1 time a character is transmitted and ce_ c eivedt Keyboard Test Do t bis test when you su pect a sin...

Page 121: ...SETUP CH 1 E68 19 TRIG MOOE TR1GS0UR tE DISPLAY MOOE SWEEPSPHD NOU I i V D IVISION NORMAL CH 1 oc INT NEG CH l 1 rwOIVISION THi A 80 E WA VffOAM ASSUMES PAHlTV IS SH TO J IT MAR USART Serial Date Low...

Page 122: ...rd from the power source 5 2 PRIHTHEAD Remove the printhead as follows Figure 5 2 1 2 3 WARNING If the terminal was recently used the printhead ay be hot Be careful when handling Open the access cover...

Page 123: ...ARRIAG ASS I Figur e 5 1 PRll H HEAD PRINTHEAD Sf RVO MOTOR RIBBON DRIVE CABLES f lf 0 1 11 IIOARD L OGIC BOARD EXTfRtlAL CA8L E CONNECTOR POWER CORO FUSE K VBOARO 8EZH FRU Removal Sequence 5 2 PR1t r...

Page 124: ...BONNET 5 2 p QW ER CORD PRINTHEAO ADJUST LEVER Printhead CABLE GUIDE PRINTHEAD ADJUST SUOE JI 5 3 SCREWS 1 21...

Page 125: ...ot Push in sl ightly whil e turning counterclockwise Pull o ut the fuse with its base holder and remo le the fus e Install the fuse by r eversing steps l through 3 CAUTION When replac ing a f us e ake...

Page 126: ...ACCESS _ COVER _ __ IOA IIIAO Figure 5 3 Fu s e Figure 5 4 Bonnet Housing...

Page 127: ...g steps l through 4 CAUTION Do not pinch cabl es when installing the cover housing 5 6 ACOUSTIC CODP LER ASSEMBLY Remove the acoustic coupler assembly as foll ws Figure 5 6 1 2 3 Remove the cover hous...

Page 128: ...BASE HOUSING ISOLA TOR POST MICROPHONE MUFF ACOUSTIC COUPLER ISOLATOR POST Figure 5 6 SPEAKER MUFF Acoustic Couple r H o using AssemblV...

Page 129: ...ou can remove the acoustic coupler by lifting straight up CAUTION Wh n t iaghtening t be i olator bes nuts tigbt D until nug Do not overtighten J n tall t be coustic coupl eT by reversing steps 1 thro...

Page 130: ...I POWER SUPPLY BOARD...

Page 131: ...e the two screws from the integral mod em boai d if installed a nd sl id e the board forward out of the left a nd right rail slots 6 Disconnect both iceyboard connectors JS and J6 from the logic boar...

Page 132: ...Keybo ard As sembly MAtf 4 6 6 WIRE RIBBON CABLE TOJ3 ON KEYBOARD Figure 5 9 SCRfWS 5I I I HEZEl Keyboard Cables J J J6 LOGIC 5 BOARD JI I l p 2 t I f a...

Page 133: ...correctly seated in the rails 111 Hui t l 00 I B O rO CHfWS 1 1 I I I l 5 12 5 11 TELEPHONE INTERFACE CABLE CONNECTOR ASSEt1BLY Remove the telephone interface cable connec tor assembly as follows Fig...

Page 134: ...Integral Modem Board 5 12 INTEGRAL MODEM BOARD Jl HJ N D n i ____ TELEPHONE TO Jt ON JACKS 2 THE INTEGRAL MODEM BOARD I EXTERNAL CONNECTOR ASSEMBLY Figure 5 12 T elephone Interface Cable Connector As...

Page 135: ...tor assembly by rev ersing steps 1 tbrougb 5 i _ r _ y o J I EJCTUINAl r 1111111 COtmtCTOII ASS M8LY UUPHOti JACKS 71 Fi9ure 5 1 3 Ext e r nal CO nne ct or Assembly rl O il 0 BOAII D LOGIC 80AIIO REAi...

Page 136: ...f BOAR O E11 T E RNAL CONNECTOR ASSEM SLY TU E PHONE JACKS m GRE EN V ELLOW g Jr fl STRIPED GROUND WIRE FUSE HOLDER AC FILTER Figure 5 14 AC Entry Ass embly 5 15 GREEN POWER SUPPLY GROUND WIRE BOARD 1...

Page 137: ...tch ov er and uplug the four wi res connected to the swi tch assembl y l n st a ll tbe power l 1 swi tch by r ever sing ste ps 1 thro ugh 3 Remove t he fil t e r as follows l Loosen the po we r 1 0 s...

Page 138: ...IEW BLUE fOARKI TO ___ w _lR_E ____H5 V 220 V S VffCH WIRE 0 _________ L TOFlt TER Fig ure 5 1 5 i Power Swit ch U 0 Wi r ing PAPER OUT AND INTERLOCK SWITCH J CONNECTOR Plt J10 7 r p 2 I Figure S 16 P...

Page 139: ...t a wi tcb and l D te r l ock awl tc b artt not 1 r ar t of t be ps h te f a cb n l To r N ove th pape r ou t w 1 t cb f ro tbe 1NCba1ri f r efer t o l ar a9ra ph 5 1 7 To E o t be linte tl ock swl t...

Page 140: ...25m r l l I________ _ SH PPf R MOTOR I f19ur S 17 St ppe r M o t o r 19...

Page 141: ...s wound in a counterclockwise direction until the gr ooves in the pulley are filled The shorter cable is installed in th front of the pulley while the cable is held taut to remove slack The tension de...

Page 142: ...ADJU51 i 8H MOVABLE SLIDf JUSTABH t f Vl NG 5L Of __ TENS ION SPRtNG IDLER lf NS ION BRAC T LE R J Ll V A SSHABl V sc Ew Figure 5 19 ea i l Bar Assembly S 21...

Page 143: ...platen bearing on the platen assembly Rotate the bearing towa rd the front of the assembly until the flat sides of the bearing align with the flat side in the side plate During this step hold the plat...

Page 144: ...COt PRESS ON P LOAD SP R NG Rf lAHl fH PLAHf l UJIJSflN 8l RING S LOTl D HE SCRf i HiCl IOJ i 1 F EEC SUPPOP 1 STRAP...

Page 145: ...0 NOTE When inserting the carriage assembly on the fr ont carriage shaft ake sure the rear of the carriage is positioned on the bearing located on the rear carriage shaft When reinstal 1 ing the frict...

Page 146: ...RIVE CABLE COMPRESSION SPRING PLATEN ADJUSTING BEARING SLOTTED HEX SCREW FRICTION FEED SUPPORT STRAP FRICTION FHOA EMBlY PRE LOAD RETAINER RETAINER RING CARRIAGE ASSEMBLY FRONT CARRIAGE SHAFT REAR CAR...

Page 147: ...the platen assembly o r car riage assembly has b ee n repla ced Adjust the paral leli sm as follows 1 Remove the printhead Paragraph 5 2 2 Remove the pr tn te_r mechanism Paragraph s ls 3 4 Insert th...

Page 148: ...PPER RIBBON ORIV PULLEY f USB0N DRIVEPULLEY l f igu r e 5 22 Ribbon Drive Cables 5 26 BALL END Of RlBBON DRIVE CABLE UPPER RIBBON DRIVE CABLE LOWER RIBBON DRIVE CABLE VIA 0877 BJ M A 0819 83 Figure 5...

Page 149: ...LY Remove the interlock switch assembly as follows Figure S 24 1 Pet form steps 1 through 5 of the acoustic coupler assembly remo al Paragraph 5 6 2 Remove the U clip or scre w holding the interlock s...

Page 150: ...INTERLOCK SWITCH lot erl ock Switch Assembly 5 29...

Page 151: ...b by r eversing steps 1 through 5 P AR IJ Of H ttCT IO tl U D ASS M lt V TO J100N THE LOGIC BOARD ISfE flGU U ltH 5 18 LOGIC BOARD Remove the logic board as fol lowc Figure 5 26 L 2 3 4 5 6 7 Perform...

Page 152: ...PART OF fR tCTfON FEED ASSEMBLY TOJlOONTH E LOGIC BOARD J SEE FH URE 5 261 I j J Jl DENOT ES PIN I 5 2 6 L o 91 c Board Connectors F1gur e 5 31 PC SUPPORT 2 PER RAIL SIDE RAILS 12...

Page 153: ...i th needlenose pliers and pull PC supports out of t ottom of rails Install the l ogic board by rev ers1ng steps l th rough 9 S 19 BOLL PAPE R HOLDE r The r ol l pa per holder has two parts one for ea...

Page 154: ...LEFT SIDE aOLLPAPER HOLDER l SPRING t OADED Figure 5 27 Roll Pape r Holder SCREW...

Page 155: ...re a subset of the transmitted characters and are marked by asterisks A 3 ESCAPE AND CONTROL SBQUBNCES Escape and control sequences provide additional controls that are not provided by the control cha...

Page 156: ...ers If the characters received after the ESC character are in the octal range of 040 to 057 they are intermediate characters The characters are stored as part of the sequence If the charac ter receive...

Page 157: ...Record separ ator Uni t separator Detete Character Mnemonic NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR so SI DLE OCl XON DC2 DC3 XO FF DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS us DEL Received c...

Page 158: ...a control seq uence The intermediate and final characters together d efine the function of the sequence The Corr espondent performs the actio n specified by the sequence and then continues to print d...

Page 159: ...H ESC H 033 050 11 0 033 051 11 0 033 052 110 033 053 110 Germany SC K ESC I ESC K ESC K 033 050 113 033 051 113 033 052 113 033 053 113 French Canada SC 0 ESC Q ESC 0 ESC 0 033 050 121 033 051 121 0...

Page 160: ...n 033 133 140 HPR ESC Pn a 033 133 141 VPRU ESC l Pn A 933 133 HH VPRO ESC Pn e 033 133 145 PLO ESC IC 033 113 PLU ESC L 033 114 RI ESC M 033 115 ESC Pn A 033 133 101 A 6 Horizontal Pi tcb Characters...

Page 161: ...SC J Clear all OECCAHT ESC 2 tab set 033 112 horizontal 033 062 tabs Vertical OECVTS ESC 3 Set DECSHTS ESC Pn Pn tab set 033 063 u horizontal 033 133 073 165 ESC Pn Set O CSVTS Pn V tabs vertical 033...

Page 162: ...aracter causes a bell tone to sound This character causes an exit mode immediately fr om graphics This ch a racter replaces any chara cters re ceived with errors SUB is processed as a one column spa c...

Page 163: ...W5 for this configuration Figure B 1 A cable adapter ITT81i128 is required that contains 25 pins on the end c onnected to the Correspondent and 37 pins on the end connected to the modem If the extern...

Page 164: ...Figure B 1 EIA RS423 Jumpers B 1...

Page 165: ...is on Table B 1 EIA Interface Pin Assignments Cont Pin 11 l 2 Naae Busy Speed indicate lltol8 No connection Plneao nic SPDI 19 Secondary SRTS request to send Data terminal r eady 21 to Z2 No connecti...

Page 166: ...ground for RS423 if jumper W5 is installed TXD consists of serially encoded characters generated by the terminal RXD consists of serially encoded characters received b y the terminal When the RTS sign...

Page 167: ...ninal to indicate terminal cannot receive SPDI speed input signal fr om Bell 212 modem to terminal Indicates 300 or l 2 00 baud if terminal is in auto answer mode If j wnper WL0 is installed SRTS is a...

Page 168: ...inal Current flows away from this termir al Current flows into this terminal Not used Receive Positive R Current flows into this terminal Not used NOTE V s 12 Vdc 51 V 5 Vdc SI Rs 318 ohms SI Vd 2 9 V...

Page 169: ...IlllU 1111111Ill 111111 P IN 25 PIN 14 000000000000 0000000000000 P IN 1 25 PIN MALE CONNECTOH B 4 PIN ASSIGNMENTS t TEST EGATIVE l TRANSMIT 3 RECEIVE TRANSMIT 7 RECEIVE 8 PROTECTIV E GROUND ll rr 1I...

Page 170: ...ceptacle mar iced LINE o n he terminal and the wal 1 receptacle The acoustic equipment via telephone coupler inter faces to the bui 1 t in acoustic external c oupler com nun ica t ion muffs and the Fi...

Page 171: ...Figur e B 4 Tel ephone to TELE Recertacl e Connection TERMINAL t 1 ____ Fiqure B 5 Receptacle to W3ll Receptacle C0nnect ion Fig ure B 6 Acoustir Coupler Intetface 8 WALL...

Search results

Summary of Contents for DECwriter Correspondent

Reviews:

Related manuals for DECwriter Correspondent

Brands by name

Popular brands

Digital Equipment DECwriter Correspondent, Technical Manual

Search results

Summary of Contents for DECwriter Correspondent

Reviews:

Related manuals for DECwriter Correspondent

Brands by name

Popular brands