PIN 990450

Commodore Graphic Printer

Technical Manual

Model 1515/1525 Manual

e:: commodore COMPUTER

These documents are for repair service information only. Part numbers are for reference only. Only parts on current dealer parts list are available. No license is given for any use by possession of these documents and may not be reproduced in any form withoutthe written approval of Commodore Electronics Limited.

CONTENTS

I. SPECI FICATIONS .......................................................................................................................... 2

II. CONSTRUCTION ............................................................................................................................ 5

1. SUMMARY ................................................................................................................................. 5

2. PRINTING ................................................................................................................................. 7

3. LIN8FEED ................................................................................................................................ 10

4. CIRCUIT ..................................................................................................................................... 12

5. TIMING DIAGRAM ................................................................................................................... 14

III. REPAIRING LEVEL ..................................................................................................................... 17

IV. MEASURING INSTRUMENTS AND TOOLS ........................................................................ 17

V. MAINTENANCE ............................................................................................................................. 18

1. CLEANING ................................................................................................................................ 18

2. LUBRICATING ........................................................................................................................... 18

VI. DISASSEMBLY AND REASSEMBLY ....................................................................................... 19

1. UPPER CASE ............................................................................................................................. 19

2. LOWER CASE BLOCK AND MACHINE ASSEMBLy .............................................................. 20

3. LOWER CASE BLOCK .............................................................................................................. 23

4. CONTROL PCB UNIT AND LAMP PCB UNIT ........................................................................ 26

5. PRINT HEAD UNIT .................................................................................................................. 27

6. LINEFEED MECHANISM .......................................................................................................... 28

7. FEED DRUM AND CARRIER UNIT ....................................................................................... 29

8. GEAR TRAIN ................................................................................................................. ,.......... 32

9. TRACTOR ........................................................................................................................ .......... 34

VII. TROUBLESHOOTING.................................................................................................................... 35

1

I. SPECIFICATIONS

1. General Specifications

• Print method ................................... Impact dot-matrix print (SEI KOSHA's uni-liammer method) • Print format .................................... 5 x 7 dot-matrix • Charactors

• Graphics .•........................................ • Character Codes

• Character size ................................. .

upper/lower case characters, nu- rreric s~ols, & Pet graphics Dot addressable. 7 vertical dots per column

8-bit codes (Vi c-20 ,C-64 codes)

Height: 7 dots (2.82 mm) Width: 5 dots (1.76 mm) • Print Speed .............................. ........ 30 characters/sec. (left to right, uni-d irectional) • Maximum Columns .......................... 80 columns • Character Spacing ........................... 12 characters/inch (10 charcters/ inch on 1525) • linefeed Spacing ............................. 6 lines/inch .............. Character mode 9 lines/inch .............. Graphic mode • linefeed Speed ................................ 5 lines/sec ................. Character mode 7.5 lines/sec ............. Graphic mode • Paper Feed ...................................... Pin feed • Paper Width . ........... ........................ 4.5 to 8 inches acceptable (10 inches on 1525)

• Number of Copies ........................... Up to 3 copies including orig. • Inked Ribbon .................................. Inked roller built-in cassette type, single color • Dimensions ..................................... 132 x 328 x 172.5 mm (1525; 23LOx420Nx13lH) • Weight ............................................. Approx. 2.5 kg (1525; 4.:3<g)

2. Environment

• Power Requirements

• Power Consumption ...................... .

• Temperature .................................... . • Humidity ....................................... .

117 VAC±'IO%, 50/60 Hz for USA )/60 Hz for Europe

15 watts max. (character printing) (1525; 200) 5 watts (idling) (1525; BN) 5°C to 4Q°C 20% to 80% (non-condensing)

2

3. Features and Codes

3.1 Main features • Double width character output under software control. • Graphics capability (picture and graph output capabilities). • In the graphic mode, a graphic data pattern can be repeated as many times as you want with a single command. • Print position addressable by character or dot column (positioning control). • Graphic, character and double width character modes can be intermixed on a single line. • Automatic printing. When the text exceeds the maximum line length no data is lost due to overflow. • Self-test printing is available.

3.2 Printing modes • Character mode • Double width character mode • Graphic mode 3.3 Control codes • N L (O,A) Line feed after printing • CR (0,0) Line feed or no line feed after printing (jumper selectable, see below) • DC4 (1,4) No line feed after printing (The above three codes are print commands) • BS (0,8) Graphic mode command • SO (O,E) Double width character mode command • SI (O,F) Character mode command • pas (1,0) Print start position addressing • ESC (l,B) When followed by the pas code it is used to specify a start position according to the dot address • FS (l,C) Repeat graphic select command

3

CURSOl UP MODE Code Table

0 010 0 0 ! 0 I 0 I 0 1 , 1 I 1 I 1 , 1 I 1 ! 1 I 1 , . I I -----+- 0 01 0 I 0 1 I 1 I 1 I 1 0 0 I 0 i o II! 1 I 1 I 1 i I i 0 0 I 1 I 1 0 I 0 I 1 ! 1 0 0 I 1 i 1 ! 0 i 0 I III I 0 I 1 I 0 I 1 0 i 1 , 0 I 1 0 1 , 0 1 I 0 I 1 ! 0 I 1 I , I , l 07 I 06 I D51 04 I 03 : 02 i 01 . DO i I 0 ; 1 : 2 I 3 I 4 I 5 I 6 , 7 8 9 A B , C 0 E : F , ,

0 i 0 , 0 i 0 I 0 POS; SP: IJ I @i PiE 0: SP ~ , :' . 0 ' sP: [21 , i 0 0 0 i 1 , 1 (IN'~ · I 1 I A , Q ' ., ~ l,0:': [J :x:: • • [J a:i , , (ll'\~', I I,;' I I 0 ; 0 1 i 0 2 svs · 2 I B R . r; n REV ~ -, I II .~ I O~ , , , """ OFF • I ... I 0 0 1 1 3 ; 3 r C S. ~ ~ :r •• "-:1: , - , , , ! I! ~ I , I I T: ~ 0: ::J C r--.Il =._U ~ 0 1 0 0 4 S i 4 D, I 0 , 1 , 0 , 1 , 5 I t}o : 5 I E U!LJ'Ld C_t= C :2 o [: I 0 , 1 1 0 i 6 I ! &! 6 I F v· Q ~' I ] ;- ~ ~ CL , ; ~ i 1 I 1 i 1 I 7 j 1~~WiIJ u~~L:fn c l:l u~[Ji I 1 i 0 , 0 I 0 I 8 BS :(18 HIX![] ~! m - [] ~.;Di I I , I ~ : r:]i-. t; 1 I 0 I 0 I 1 I 9 , I 9 I , Y n'r: []r"! I ) I -~, : .. , 1 o j 1 i 0 ! A NL SLll: • J I z I~!~i :0 o : ~ , '+l ! 0 ;]1

1 I o I 1 ) 1 I B ESCj + ; I KI [ I ~ I Eli i . ICE 1J';r a:J: [] , L! ! L.J I,' I

1 1 I 0 I 0 I C I < LI T 10 : (] I

, :[1 ~'CIJ![i:"1 I I, , I'

1 j 0 ;[5 , m~ 1 I 1 I D CR , -I = N ) i ~!~! 0]1 "::11' , i ,-i 1 S ,OJ [5 I L!~ I 1 i 1 I 1 i 0 I E SO I I ) O! ,il ~i:ZGlI!:L'1Il1 , I T : 0 i If I " • 1r I, , /1 I .-o:~: -i I 1 ! 1 i 1 ! 1 F 51 : , p: Ii !iI ,[ ~: r , ,- . , I • : - - ~i -

CURSOL DOWN MODE Code Table

0 I 0 I 0 0 j 0 0 0 I o t 1 1 i 1 I 1 I 1 I 1 1 , 1 1 i , , 01 0 I I I I ! I 0 0 I 1 1 1 1 I 0 , 0 0 0 I 1 1 , 1

0 I 0 i 1 1 , 0 0 1 1 i 0 i 0 1 1 I 01 0 1 I 1 I I I I

i ,

I , , 0 1 0 1 0 1 ! 0 1 I 0 , 1 0 1 011 o I 1 I , I

I 07 i 06 I 05 i 04 03 : 02 : 01 : 00 I It 1 I 2 3 I 4 5 , 7 I I i 9 A 8 : C I 0 E I F , ,

0 I 0 0 i o I 0 ,POS· SP II I (!. p .6: pi I SP' Gi P SP: [2 ,

0 I 0 0 ! 1 I 1 tYR;:". , 1 I • II : A I QI ':l,~~, [J L ~ ~ A ! Q i [] ;:I; i ;VJ~ ~ , , L........i

I 0 i 0 1 0 i 2 svs ~ 2 I b r B! R It .. :v"'--r-~~ B ! R I. " ; ! 0:-;' OFF .~tr_ . ::r: ' 0 i 0 1 1 I 3 I I ;: 3 , c $ c I 5 LO~, E[ c s IO;:i I I ~ 0 1 0 0 I 4 , si 4 d t Oi T 'DO: Dr TiO,D ,

0 1 0 1 S 90 I 5 ~ u E I t' . 10 [JI E i u 10 [J' ; 0 1 1 0 6 , lJ,; 6 f \- t- \. I 1., [] i F I V EiJ I , i , : ~ 1 v; i DID! Gjw DiU: 0 , 1 1 1 i 7 I ' , 7 , c ,.. G , I i , ~ ! ii I u I I 1 0 0 0 8 BS: 1 ( I • , h It H I X i i HIX m~ I , , ,

1 I 0 0 1 9 ) 9 I i I ). ! I yl i ~I~! ' I f&' ~ , I 10 lal

I : Y , • : 1 1 • 1 0 A :\L :5Lll • j ) z I J Z liZ D:.ai

1 I 0 ! 1 , 1 1 B :ESCI + k I [ I K iii

~ [E lJ KIE8 []:iJJ I ; ,

1 1 i 0 0 c < J , ¥I L (]i : [J ~ L II] [il~i ·

I i - J l M []i rs E!l ~I I [] [!jitJi I 1 , 0 i 1 0 CR - = mi I ,

1 1 1 I • E 50 ) • ! T , N g' I @ ~ ~!~IEili[]! ; I i

1 1 I 1 I 1 F SI / • 0 ! .-1 0 ~i i IlJ!~ OI~ICJI~' ,

4

II. CONSTRUCTION

1. SUMMARY

Figure 1 shows the block diagram and Figure 2 is a flowchart showing the sequence of its motion.

I nput data

Control PCB unit ,-------- I I

I I I I L __ _

.---L..-..... Print mechanism

Figure 1

5

117VAC, 220 VAC, or 240 VAC

I I - -1- - - - -I

I I I

I I I I _______ J

Line- '--_---' feed

OUTPUT THE STATUS OF "NOT BUSY"

NO

YES

OUTPUT THE STATUS OF "BUSY"

NO

WRITE THE INPUT DATA ON BUFFER

NO

YES

YES

Figure 2

6

PRINT OUT THE DATA IN BUFFER

2. PRINTING

(1) PRINTING MECHANISM This Printer is based on a single printing hammer system which is quite unique and different from other impact dot printing systems. The timing of hammer printing depends upon revolution of the rotation detector. This revolution, rightward movement of the hammer and the revolution of the platen are synchronized. Character and graphics dots are printed when the relative positions of the hammer head and the platen are encountered. The relationship of the hammer, the platen and the dot sensor is shown in Figure 3; that of the hammer head, printed dot, and signals of the dot sensor in Figure 4

VIEW POINT FROM®

PART®

HAMMER HEAD HAS A SLOPE 8 AGAINST RIDGES

P3---4-+-+f---- P2 B7~~~~",---,---- PI---~--~-

/

Figure 3

DETAI LS OF PART ®

.. 25.4/12-...,.

bOI ao a .. a2 a3 a4 as a6 a7 a8 a9 bo

.---- I -E E -N m - N I ~

l I I

I

iE-l.76 __

I. ,. ,.

--II"

~ ~. ". ". ii~

~

I

II

PLATEN 10 rps (Revolutions of motor are reduced to 1/6 by reduction gear) Has evenly divided 18 ridges PI, P2 , ••••• , PI8

FEED DRUM UNIT

CLUTCH

(d)

REDUCTION GEAR

ROTATION DETECTOR

( Fixed to motor shaft) 60 rps

-+-1+- DISTANCE BE TWEEN DOTS

! ~AMIM~R HE1~ ,-1-8

T I., "- zt -1 N wen ~ Ww • I ~ ~g ;::::J

I~ ;::::J w- .~ ma:: ~ wei:' '"""=l u- ZZ ;::::::J c(w I .". ,. 1-1- '--- enc( -...I c,*Q.

PLATEN 1 REVOLUTION (O.ls) Hammer moves 6.35 mm (1/4 inch, during 3 characters printing

SLOPE OF HAMMER

8 =tan~ p

7

(2) CARRIER UNIT MOVEMENT AND RIBBON FEEDING Figure 5 shows rightward movement of the carrier unit and ribbon feeding due to motor revolutions. Figure 6 describes the carrier unit's return to the home position, activated by the H solenoid.

PRINT DIRECTION OF RIBBON MOVEMENT HEAD UNIT

RIBBON CAM RIBBON FEED BOARD

RIBBON CAM R'::tt

Ribbon is fed in the arrow direction when ribbon is caught between ribbon cam and ribbon feed board. When carrier unit returns leftward, ribbon is not caught.

SPRING

RIBB~NI ~ \ FEED BOARD RIBBON

Figure 5

CONSTRUCTION OF H SOLENOID AND CLUTCH m CLUTCH H SOLENOID;l (JAW CLUTCH) 'j , ---J<1 / . ! ,

When H solenoid is pulled, the clutch is released and the carrier unit returns to the leftmost home position forced by the recovery spring.

CARRIER UNIT AND PRINT HEAD' UNIT

1/1/1111 //11 1111/111 1/1" 11//11/11/"" 1111/11111111111111111111111111 IIlIllIllllIIl/lIIlII 1/111/111 1111/ , ---'---------'

RECOVERY SPRING

Figure 6

8

(3) HAMMER DRIVE (PIN DRIVE) FLOWCHART

NO

RESET PIN CNT

SHIFT PIN-REG RIGHT BY ONE

FIRST 0 CHARACTER PATTERN "A" OT 0 ,0 0 - ~ 0 0 0 0 0 0 0 0 0 0 0 0 0 r--'r'0 0

SEVENTH DOT ~

) PIN-REG

NO PIN DATA REG = 1

NO

YES

HEAD COIL ABOUT 290 p.s "ON"

PIN CNT = PIN CNT+1

END

Figure 7

9

PIN DATA REG

IO~D )

FIRST DOT

PIN CNT: A counter for pne column (7 dots) of a character pattenl. PIN-REG: A register storing one column (7 dots) of a character pattern. DOT SNS: Timing signal for each dot. PIN DATA REG: One bit register for a dot to be printed.

3. LINEFEED

(1) LlNEFEED MECHANISM Figure 8 shows the linefeed (paper feed) controlled by the motion of the LF solenoid. The LF solenoid is activated three times for printing characters and two times for printing graphics. The transmission sequence of a LF solenoid motion is:

LF r---- CLAW WHEEL f-------- LF CLAW f-------+ GEAR f-------. TRACTOR I--- TRACTOR SOLENOID UNIT WHEEL PIN SHAFT

The condition of the claw wheel unit when the LF solenoid is inactive is:

i) The claw wheel unit is pulled by the LF rope spring. iil The saw teeth of the LF claw wheel and the saw teeth which are pushed by the claw wheel spring are coupled.

REVERSE STOP CLAW

EARTH PLATE (Ll

LF SOLENOID

LF ROPE

CLAW LF CLAW EARTH LF CLAW WHEEL STOPPER PLATE (Ll WHEEL UNIT

.CLAW WHEEL SPRING

LF ROPE SPRING

LF SOLENOID

Figure 8

10

(2) LlNEFEED FLOWCHART

LENEFEED

LFCNT = 3

LFCNT= LFCNT -1

YES

END

NO

LFCNT: COUNTS THE NUMBER OF LlNEFEED

k'~~~:/~Zb~G I I I II r---~I_-_--_·~~S~~~~O'D"ON"

I ~ ~ . LF SOLENOID "OFF" ~ 33ms

33 ms

Figure 9

11

~ N

eN I

ADDRESS/TEST SWITCH RAI-I I ':~--------------T,~~~e ~~ CN2 0.1 ~ RD - .::=il Vc<° [~W;;~?tJ

o..S7.)

ATNPJ A .. _A

£If W Vee

I~RAH Sfto.03

GND~

C3""'- C8 Vee 11_-f 10H II .,JT

(NOTE)

Aa A.

RESISTOR VAlUES ARE IN (kQ] UNLESS OTHERWISE SPECIFIED.

CONDENSER VALUES ARE IN (PF] UNLESS OTHERWISE SPECIFIED. *1.*2 WITH HEAT SINK. 2732 - CONNECT J I • J. 2332 -CONNECT J2. J3

'E=:

w ~~Ol~~~ *"~YE -::;t - __ 12~3 c2llRI~CN5- Y . ........ (LS I.) 10.Z ll:2.2

L....L..!J~~ -' L--I>lIP~ -' ~

a.

RI. 0.075 (2W>

)C~ RD CN8 HEADa..umt WH I) CN9 • • m LF WIItH Gft

• C7JY)E CNIO

I t£ADaIl

vee-----<D~~L-~ ~OR~ERLA~ 0.3

SlR~o BlU

~ * J 1 0 ;: r '0 1.2' cn~u, tt~) .. I' + PA780SC ~~ + 1* I (6.~ __ _ D. HZ6C2 CNIl

+>.1 • r.,... lYE

•• J • ___ u'. . ... __ ._.. ,-----",) CNI'

Figure 10

~ • o -:l:J o c: - ~

~ '-I

LED~III II II n,.IIII. r~1I II ___ PH II II-Orange Jumper

White 1it-lJ II I~BlueJU- Yellow Red II 1I11--White Red

R7 II IlcON'I/ II R9

RA ..

C6

Ilbuuu u~l'4 ~'7 ~ TP30 e:Eq) ~8

C19' -~ ....

o ,," ~-~!~~f1~~'"';A;""1 ~ cloIO~9ga~~aa~J PI P2 i~UUCI4 ~R5

11000 oouou 'IRAI RI7ce:::p ~

[::~:::] C}::] [:::~::] 05E 1'-"-"-"-"-:~~o-"-"-"-"-'l~::](::'J:]

®f:: :~:~l [;;; ;;ii: ;:;: ;;:;: ]Q, [El]

CONI R3 RA2 .rIIXI =

11 6 ouuuuJf.2J~~~

• SWl : GP-SOA only

Figure 11

w - n g .... ., Q - C9 III n c 3 ~ c ;:, (1) ;::, .... < .... (1) ~

811~11~11 Q31111il1.JI.IIIIAIr'l1l 'o21111111.l11 111111

o

5. liMING DIAGRAM

(1) Initializing motion '" __ ---------------------------------+5v ~---------------------OV t Vee

POWER ON ~---------------------------+5V RESET (Pb/4~,.....,

I ____ J --.I about - - - - ~- about ~ -----J - I 66 ms 66 ms I HONE (?I/I2.) ~ ______ - __ - - __ - - ___ I

Figure 12

When power is applied, or the~signal is input to'P2/l,2 [No.1 and No.2 teriminals

of IC P2], the CPU (P6/4) accepts the RESET signal, the CPU is reset as long as this signal is LOW, or about 2V or less. The CPU activates as soon as it rises from LOW to

HIGH. First, the CPU makes the HCsignal (P8/9) LOW turning on the drivers (P7/l3,14).

When they are on, the H solenoid is ~ved to the head carrier return to the home

positon forced by the recovery spring. The HOME signal (Pl/12), which is shaped from

the output signal of the home sensor, is HIGE the head carrier is at the home

position and is LOW when out of the home posit1L~. The CPU checks the HOME signal to

see whether it is HIGH or LOW. If it 18 HIGH, the CPU will ~e the He signal HIGH

66 ms later; if it is LOW. the CPU waits until it becomes HIGH and 66 .s later the

CPU will make the KG signal IIICH. When the Hc signal becomes HIGH turning the drivers

(P7/l3,14) OFF (HIGH), the head carrier has returned to the home position with

completion of the H solenoid motion. Next is to move the h~Jcarrier to the aiddle of

paper and back to the home posi tion in order to check. and memoril,e the timing of rising edge of the HOME signal relatively compared with the DOT signal. This timing will be used as the criterion for the CPU to decide when to start printing. With

the abave procedure, the printer finishes the init~li ing motion and can accept

input data from this moment. Input and output of the printer are conducted through

VIC ser_ial bus.

14

(2) Start of the printing motions

MOTOR (pg/S") I

--f about----------------------------------------- 160 ms t--

He (P8/9) I [

HOME (PI/IZ) First dQt of Fiest dot of dot position 0 dot position 1 j4-- 5.56 ms---l --..,;---...... ~ .. 2 3 4 5 6 7 1 2 3 4

~OT (P3/8) nnnnnnn nn ___ ---<5fj~uuuu~~: : : : .. : : :

PI N (~P-S~/J-3 ~) --- 580 IlS 1.9 ms ----t'=t~~~~~

Figure 13 First column of pattern "A"

\- .. Second column

When printing starts, the CPU makes the MOT (P8/S) andHC signal

LOW. Lowering of the MOT signal makes the drivers (P7/l5,16) LOW supplying current

to the motor to race. Since the H C signal is also LOW. 'the H solenoid is activated

to relieve the motor shaft from the head carrier for about .160 ms so that the .ator

can reach constant speed of revolution. TheFfC signal is raised to HIGH engaging

the motor shaft and the head carrier to move it to the rightward direction. In case

there is no or abnormal output from the dot sensor, the CPU turns theHC and lUYr

signals HIGH and halts to do nothing because aechanical error must have occurred.

Next, the CPU waits and sees if tho printhead leaves the home position via the

HOME signal (Pl/12). After confirming that the HOME signal becomes LOW which means

the head carrier gets out of the home positi~." the CPU goes to check the DOT signal

(P3/8) in order to decide when to start printing. The DOT signal is a shaped output signal of the dot sensor and a group of 27 seruential pulses repeats at a constant interval. The rising edge of the DOT signal following the comparatively long duration of staying LOW (1.9 ms) is the timing to start printing. When this signal rises from

LOW to HIGH after staying LOW for .are than 640~s, the CPU takes it as a'timing to start printing and jumps to the hammer drive routine. In case of printing one dot,

the ~lN signal (PB/13) of the hammer drive pulse which is synchronized with the DOT signal is made LOW for about 290;Ms. Lowering of t~e PIN signal .. kes the driver

(P7/IO) LOW, turns the transistor (Ql) ON and drives the hammer. The 27 pulses

consist of three 7-dot columns as shown below.

15

, U >OO"'~>UI~) (I/(,lJO)f!Ii~~1t!') Z.J fJ'1"" ""4/~~~"'7/"'.~'O»~:JI'»~' ~ ( 2 f'\cl Col~n)

When the HOME signal falls down. the CPU starts counting the number of dot pulses until the DOT signal stays LOW for long (about 1. 9 ms). The CPU uses the counted number to compare with the number "stored at the initialization in order to

decide when to start printing correctly. The HOME and DOT signals can be checked

through test pins (TPl,TP2).

(3) Recovery motion

Hc(PJ/,)

HOHE (P 102)

~}=4C(f8/11 )

( · • · · I Ibout --.{ 66 ms~ I

Figure 14

The CPU lIakes the liST signal HIGH and the rc signal LOW after printing a live.

With this. the .ator stops revolving and the head carrier returns to the hoae position forced by the recovery spring. If a recovery .otion includes a line feed, the output of LFC signal (P8/l1) follows. While this signal is LOW. the drivers (P5/ll.l2) are also LOW activating the Ll solenoid for 1inefeed by 1/18

Dnch. After 1inefeed, the CPU waits until the HOME silna1 returns HIGH. When

tPe head carrier returns to the home position and the HOME signal becomes HIGH,

the C signal is raised to HIGH about 66 lIS later' ending the recovery .otion of the head carrier.

16

ID. REPAIRING LEVEL

Follow the sequence below to repair and adjust the Printer. CD Remove if an interface is attached. W Proceed the repair according to the repairing levels (!y or (5" described below. Level ®: Disassembly, replacing parts, reassembly and adjustment of eat.1l mechanism. Replacing parts of control PCB unit. - (Sophisticated repair) Level ®: Replacing blocks including simple parts replacement. Replacing and adjusting the print head. - (Simple repair) Level 'll; and .Jt are used in the following chapters to indicate a level of repairing methods.

IV. MEASURING INSTRUMENTS AND TOOLS

The following items are necessary to repair or adjust the Printer.

1. Oscilloscope

This is used to adjust the position of the home sensor unit, or in other words, to adjust the alignment of the printing start position. It is also used to check the control ,PCB unit.

2. Multimeter (VOM) 3. Print head adjusting tools .

Figure 15

®

@

~) is used to hook a spril"YJ to the print head unit and .,~. is used to drive the head ajdusting nut and the nut. If these tools are not available, use non-magnetic material tools.

4. Tools (screwdriver, tweezers, pliers and nippers) 5. Soldering iron (For electronic parts) 6. Desoldering tool

17

v. MAINTENANCE 1. CLEANING

Due to Its material, each part has its own proper cleaning liquid and method. It should be noted that if an improper cleaning liquid is used or cleaning method is poor, parts may be damaged or may not function properly. Follow the instructions in Table 4 to clean. It is helpful to use a hair drier to dry. But if the cleaning liquid is flammable, take care to keep it away from the hair drier.

Table 4

PARTS CLEANING CLEANING DRYING REMARKS METHOD OIL METHOD

Metal parts Brush washing Benzine Of Warm air trichloro- ethylene

Plastic parts of the Brush washing Benzine Cool air Do not use any oil other

mechanisms than designated one. Wash quickly, wipe with a cloth and dry rapidly. Use good, clean oil.

Plastic parts of the - - - Wipe off dirt.

enclosure

Rubber parts - - - Wipe off dirt.

Electric parts Do not wash Wipe off dirt with a

[PCB u., Motor cloth with benzine or

H solenoid u., alcohol.

LF solenoid u., Dot sensor u., Home sensor u., etc. - -

Print head u., Carrier u.

Rope parts Do not wash Do not wipe or touch I Feed drum u. the rope.

Head rope (L) u. - - Lubricate with oil only.

- Claw wheel u.

2. LUBRICATING

Use the following lubricants in repairing and adjusting the Printer. Portions needed to lubricate are described in the next chapter, VI DISASSEMBLY AND REASSEMBLY.

SF-100 J-5 Screwlock

18

VI. DISASSEMBLY AND REASSEMBLY

If there are two levels to repair, ® and ® are used to describe the difficulties of repairing methods. To disassemble, follow the sequences written in each figure and follow the sequences in the reverse order to reassemble.

1. UPPER CASE

1-1 S-36 1-2 1-3

Soundproof cover S-3~ Tapping screw M3 x 16 1 Cover unit Upper case unit

* When attaching 1-3, adjust the position of the lamp PCB unit so that the lamps are at the centers of the holes.

• Confirming the function

I S-36-1

Follow the procedures below to confirm the functions. Figure 16

1-1

(1) After applying power, check whether the power lamp being lit and the printer initialized. (2) Check whether paper advances properly with LF dial. (3) Is ribbon advancing? (4) Is it possible to set paper properly? (5) Check printed characters (wrong printing, character missing or smudging). (6) Is the aligning of the start position of printing properly achieved? (7) Is the last column printing possible? (8) Is there any abnormality in character width, height or space between characters? (9) Is there any dot missing at upper or lower part of characters? (10) Are printed characters vivid? Is there any dirt caused by ribbon? (11) I s the spacing of I inefeed proper?

19

2. LOWER CASE BLOCK AND MACHINE ASSEMBLY

2-1 Ribbon cassette S-45 Screw W-42 Spring washer W-43 Toothed lock washer

2-2 M. sto p screw

2-3 Lower case block

2-4 Machine assembly

®

2-3 2-2*1

Do not move the carrier unit directly by hand. By pulling ~nd revolving the clutch on the right side counterclock- wise, the carrier unit can be moved to the center.

M4xO.7x5

M4

M4

Figure 17

Part ® setting note

Insert twisted ends of lead wire and make sure they are not shorted.

U.nplug/plug in

VIl>--'Ht-2-2* 1

Clutch

*1 Before replacing 2-3 and 2-4 with 2-2, the carrier unit must be moved to the center. When setting 2-3 and 2-4, be careful not to catch the lead wires or the recovery spring between 2-3 and 2-4, and to damage or to injure them. *2 Pay attention not to damage the flexible cable.

Note: The repair procedures for 2-3 and 2-4 are described on page 23 and on.

20

• Adjustments for printing

Make the following adjustments after setting the ribbon cassettes and paper. (1) Adjusting the position of the dot sensor Print characters and check the darkness of the upper and the lower part of characters. If the darkness is not equal, adjust the position of the dot sensor. E (a) ......-Light (b) ...... Upper part is light, move the dot sensor to right. E unit

(c) ...... Lower part is light, move it to left. (b) E Black and white - - dot sense PH wire (c) (b) Black and red dot sense LED wire (c) "Light

Figure 18

(2) Adjusting the printing start position with the carrier unit and the home sensor i) The gaps between the carrier unit and the home sensor Gaps A and B should be about 0.5 mm, with B smaller than C. The gaps can be adjusted by twisting oblique line part of the earth plate (L).

A \',\\\ \' Home sensor unit

, Carrier unit

Figure 19

Earth plate (L)

Black and blue, home sense LED wire

ii) Adjustment for aligning the start position of printing (Connect TP1 and TP2 of PCB unit to oscilloscope)

Yellow and black, home sense PH wire

Adjust the position of the home sensor unit so that the falling- edge of the home sensor pulse can be within the permissible range of the dot sensor pulses.

21

Dot sensor

Homesensor--------~------~

•

per!issible range in which the falling- edge of the home sensor should be.

Figure 20

If the falling-edge of the home sensor pulse shifts to right .......... Shift the home sensor unit to right. If the falling-edge of the home sensor pulse shifts to left ..........•• Shift the home sensor unit to left.

(3) Adjusting the print head unit i) By using a print head adjusting tool to tighten the head adjust nut, proper darkness of the printed character can be obtained. If there appears to be smudging, loosen it until smudging disappears. ii) Set the head adjust lever at the hole CD. iii) With a print head adjusting tool, tighten the nut so that the head adjust lever could be moved without too much force. Then lubricate screwlock on the hexagon nut.

~ Hexagon nut @ CD ~~Head adjust lever------J.---:s.... I-=,-----x----...J @ (f) I ~Head adjust nut ~ ® 0 ~ Prjnt head unit

Figure 21

Note: As the print head unit is made of magnetic metal, do not use magnetized tools to adjust .

• Confirming the function

Confirm all the items described on page 19

22

3. LOWER CASE BLOCK

Repairing methods Level ® : Level ®:

M-01

M-20

S-02

S-43 N-02

Replace a defective part Replace a part if 3-6 to 3-8 are defective. Replace the lower case block if 3-1 to 3-5 or 3-9 are defective.

Extruded tubing <1>5 x 0.25 x 12 mm

Splice 35115

Tapping screw M3 x 12

Tapping screw M4x 8 Wire band B

5-28 Tapping screw M2.6x6 N-02 Hexagon nut M2.6xO.45

3-1 Harness (Transformer GND harness)

3-2 Transformer

*S-37 Screw with spring washer M3 x 0.5 x 4. For M02 only.

3-3 Sw. stopper

3-4 Power switch

3-5 Cord bush

3-6 Power cord

3-7 Fuse holder

*3-8 Fuse holder washer.

3-9 Connector cover plate unit 3·10 Lower case unit

Note: * indicates there is a model which does not use this part.

23

• Harness diagrom

Black, connect to 3-6 black Red, connect to 3-6 white "'-/

O..D------------il,IiI~~~~~~~~~~~~~=~ Blue } To control To machine assembly ~ Yellow PCB unit ~N~2

• Harness diagram

~~~U---...).2

Mark 'V

/ ""Black, connect to root of 3·7 Black, connect to tip of 3-7

Figure 21

Black, connect to 3-6 brown / Red '" connect to 3-6 blue.

D:J-I-------------il,rFr~~~~~~~~~~~~~;;~ Blue I To control To machine assembly = Yellow PCB unit ~N-02 ~~/1 3-2 ~~~~lL/

3-4

o a

M-20

o

Red mark 1\ BI k . f 3 Black, connect to root of 3-7 ac , connect to tiP 0 -7

Figure 22

24

Details of part ®

M-02

~i , !

34 ~ ""~ 3-3

M-02 ___ "" c:" ~ .' 'WJ ""5-37

I

N-26

3-10

3-6 I .

. shows 1525 This figure 23 Figure

I I

'~I 3-9/~ U S-2S

25

4. CONTROL PCB UNIT AND LAMP PCB UNIT

Repairing methods

S-42 4-1

F-2 F-1 4-3 S-21 W-21 W-24 4-4 4-5 N-01 N-02

Level ®: Repairing PCB unit or replacing defective parts. When fixing PCB unit, refer to the circuit diagram (Figure10 ), the PCB view (Figure 11) and the timing diagrams (Figure 12 -14). Level ®: Replacing defective parts

Q9view *1 Lead wire setting note i/ S-21 Tapping screw M4 x'12 S-21~ _____ W-21 Control PCB unit ®

W-21---® ®~W-24 Fuse (1.5A) I 4-5*2 , Fuse (1 A) ,W-24--® ~: 4-4 I nsert twisted ends of '~I/ : PCB receptacle ~: ' lead wire and make sure o , , ' Screw M2 x 0.4 x 6 /I~l

they are not shorted. Spring washer M2 Plain washer M2 *2 4-5 attachment ~ Lamp PCB unit E +~-4.5 a ;1 Lamp Wire band A Wire band B +-

4-1 *1 S-42

Figure 23

26

5. PRINT HEAD UNIT

N-21 W-23 5-1 5-2 5-22 W-23 5-3 5-4 5-5 5-6 5-31 5-7 5-8

Hexagon nut (brass) M2 x 0.4 Plain washer M2 (brass) Head adjust lever Head adjust nut Screw (brass) M2 x 0.4 x 3 Plain washer M2 (brass) Cable guide Head adjust spring Print head unit Head spacer Screw M3 x 0.5 x 6 Head board unit Head connector

*2 Be sure to get rid of dust, especially iron dust, from 5-5. Be careful not to hurt the flexible cable. When reassembling, keep pulling the clutch and revolve it counterclockwise to move the carrier unit to the center (Refer to Figure17)

*3 Barely' tighten 5-2 with the print head adjust- ing tool (tacking). N-21, W-23 and 5-1 should be set after adjusting the print head.

Rubber leg

Mark Earth plate (L)

,........"..,.,.,.~~----..,..Flexible cable

*1 Removing the hook of 5-4 using a print head adjusting tool.

___ N-21 II :-- W-23 ~-5-1 $ ___ *3 5-2 V-S-22

W-23

~.--5-5 *2

Use adhesive agent Lubricate~~ __ J-5 on top

27

6. LINEFEED MECHANISM

Repairing methods Level ®: Checking, adjusting or replacing parts

Level ®: Replacing machine assembly except checking, cleaning, lubricating or adjust- ing / replacing 6-1 to 6-3.

6-1 E-40 W-51 6-2 6-3 5-28 5-31 6-4 E-38 6-5 6-6 6-7 6-8 5-32 6-9 E-37 6-10. 6-11 W-61

LF rope spring E-4o. ring Plain washer small M5 Reverse stop claw Reverse stop spring Screw M2.6 x 0..45 x 6 Screw M3 x 0..5 x 6 LF solenoid unit BE-37 ring LF claw wheel Gear pin

6-9*1

Claw wheel unit Claw wheel spring Screw M3 x 0..5 x 8 LF claw stopper E-37 ring LF dial Dial clutch spring Plain washer small M6

* 1 6-6 should be in the groove of 6-5. but not in that of 6-7.

6-~ 6-?J2 6-8 W-51 " E-4o. ~ ~ Lubricate J-5 ~

Figure 25

28

Lubricate ~ ~/l

SF-100 ~~1~ on LF rope ~ ~ W-61 6-11 J 1 \1\ @~66-1o. ! ~ E-37

I ~fr

* 1 6-4 and 6-9 adjusting method

i) While pushing down part ® of 6-4, fix 6-4 with S-31 at the position where 6-2 falls from a tooth top of 6-5. The screw S-28 should be set to the direction as shown in the left figure. ii) While pressing part ® of 6-4, fix 6-9 with S-32 at the position where ® part of 6-9 and (i) part of 6-7 are coupled to stop the revolution of 6-7. iii) Confirm linefeed functions by pressing part ®.

7. FEED DRUM AND CARRIER UNIT

Repairing methods Level ®: Checking, adjusting or replacing parts Level ®: Replacing machine assembly except checking, cleaning, lubricating, adjusting / replacing 7-2, 7-10, 7-15 and 7-16, or adjusting the ribbon feed board.

S-3O

W-32 7-1

7-2

S-29

7-3

7-4

7-5

7-6

7-7

7-8 E-25

7-9

7-10

7-11 N-31

W-31

W-32

7-12

7-13

7-14

7-15 E-24

7-16

Screw M3 x 0.5 x 4

Plain washer small M3

FPC guide Recovery spring

Screw M2.6 x 0.45 x 8 Rope spring

Rope stopper (1 set)

Head rope (L) unit

Feed drum unit

Drum spring step

Drum spring

BE-24 ring Pulley pin

Spring pulley

Rope pulley

Hexagon nut M3 x 0.5

Spring washer M3

Plain washer small M3

Guide pillar

Damper

Carrier unit

Ribbon cam spring

E-24 ring

Ribbon cam

29

Lubrication on 7-10, 7-11 and the shaft of 7-6

Lubricate SF-1oo on the shaft of 7-6 feed drum unit

Lubricate SF-1 00 on the groove and the shaft of 7-11 rope pulley (4 pes.) Lubricate SF-1oo on the groove and the shaft of 7-10 spring pulley (2 pes.)

~

W-32 S-30

I

Lubricate J-5

Figure 26

7-1 'i

E-24

Earth plate (R)

Clutch

(5-29*6

Lubricate SF-lOa to teeth

Lubricate SF -100 on head rope (R)

/ 7-6 *4

*1 The cam 7-16 and the bend of the ribbon feed board must be parallel. If not parallel, ribbon feeding may function abnormally. In this case, you can either change 7-16 or adjust the bend of the ribbon feed board by using pliers to fit the cam 7-16.

Bend of ribbon ~ feed board , Cam 7-16 IfthereiSanyg~ here replace 7-16 I

*2 When 7-14 is at the home position, there should be gaps between the home sensor (Refer to Figure 19.). *3 Firmly insert 7-12 into the earth plate (R) and (L), and tighten with N-31. *4 Once you have removed the feed drum unit 7-6, you must install a new one. A new one, which has six winds of the head rope (R), is fixed by a fixing tool. the fixing tool should be taken off after you have finished assembling with S-29 screws.

Head rope (R~

FiXingt~

Be careful not to let the fixing tool press the adhered part of the head rope (R)

7-6 ~~@) F·· ::.---:; Adhered part of IXI~ol head rope (R)

Figure 27

*5 Insert the rope stopper 7-4 into the rope spring 7-3. *6 To fix the head rope (L) and (R) using screw S-29: j) Inject screw lOck into the screw hole of the carrier unit. ii) Tighten the screw S-29 to the extent that the rings of the head rope (R) and (L) can be re- volved. [screw 5-29

: Do not inject here ~ nject screw lock inside

Screw S-29 ~ Ring must be able , to turn around. . Screw lock should not "'" be overflowed. Figure 27 Screwlock

*7 Check the following after attaching the recovery spring 7-2. After manually pulling and revolving the clutch counterclockwise to move the carrier unit to the 'right end, check the gaps of the rope stopper 7-4 and the adhered position and status of the feed drum unit 7-6. Adhered. position Should have'rooms ~

. / when carrier unit is , • . / at the rightmost end. i_Should have rooms

• ! at the home position Feed ~rum Head rope (R) Unit 7-6 Should have gaps Figure 34

After pressing the H solenoid to release the clutch (Figure 6), check the smooth motion of the carrier unit,its return to the home position, and also the adhered position and its status of the feed drum unit 7-6 at the home position.

31

8. GEAR TRAIN

Repairing method. Level ®: Checking, adjusting or replacing parts Level ®: Replacing machine assembly except checking, 'Iubricating or replacing / adjust- ing 8-1 and 8-2.

8-1 '5-31 8-2 E-28 8-3 8-4 8-5 8-6 8-7 E-37 8-8 8-9 8-10 E-38 8-11 8-12 8-13 5-26 8-14 5-33 8-15

·1 The way to set 8-10 and 8-9.

Ridge'

• Attaching method of 8-10

Clut.ch moving spring Screw M3 x 0.5 x 6 Dot ~nsor unit E-28 ring Clutch step Clutch Spring pan Clutch spring Clutch E-37 ring Reduction gear Gear pin Rot(:ltion detector BE-37.ring Reduction gear Gear pin Reduction gear Screw M2.6 x 0.45 x 4 H solenoid Screw M3 x 0.5 x 5 Motor

Motor shaft

When a platen ridge is at the horizontal position, couple 8-10 and 8-13 in the status of a. and a, of 8-10 facing the two screw holes of the earth plate'(R) respectively.

• Attaching method of 8-9 Fit the holes of 8-10 and the motor shaft, and then insert 8-9 using pliers.

*2 First, insert the M. stop screw into the rubber leg (Figure. 17), and then fix 8-2 by 5-31. Make sure there are gaps between the grooves of 8-2 and 8-10.

"'" "'"

'-

'-..... "

Lubricate SF-l00 on the saw ~ tooth part and the tooth part of 8-4 and 8-7

*2 8-2 Black and white

Figure 29

8-12 '1

S-31

\ E-38

/8-8

Lubricate SF-l00 to teeth of 8-13,8-11 and 8-8

9. TRACTOR

Repairing methods

Level ® : Checking, adjusting or replacing parts. Replacing machine assembly if earth plate block is defective.

Level ® : Replacing machine assembly except checking, lubricating or checking/adjusting/ replacing parts of 9-1 to. 9-4, 9-9 and 9-10.

9-1 S-32

N-31 W-31 W-32 9-2 9-3 9-4 E-75 9-5

9-6

9-7 9-8

E-60

S-32

9-9

9-10

Screw M3 x 0.5 x 8 Soundproof Hexagon nut M3 x 0.5 Spring washer M3 Plain washer small M3 Guide pillar Paper holder (L) unit Paper holder (R) unit BE-74 ring Platen bearing (Bearing for teactor)

Tractor shaft

Pin feed roller

Tractor rubber ring

CE-6 ring

Screw M3 x 0.5 x 8 Home sensor unit

Rubber leg

*1 Push 9-9 outside as far as it will go and fix with S-32. *2 Assemble the two 9-7 so that the pins of them are facing each other. *3 Check that the surface of 9-6 © part is smooth and has no scar.

9-5 9-3

~u~ricateSF-l00 ~~E-75 *~/"" ,ns,de "-- ~ 9-7 1fA.

Screw loc k .~ E.aO ~9-2

N-31~ <''- 3 n '~9-6*3 ~ . ~-4 W~3t~ / I © ~~ W-32 • . 9-1 ~/

9-10

./

Lubricate SF-1OO inside

Earth plate block

9-10

VU. TROUBLESHOOTING

1. The power lamp does not light

START

Proper intitialization NO after power on?

YES

Proper contact between NO Clean contact or connector and lamp lead reset at correct wire? (Correct position) position.

YES

YES Replace power lamp.

Repair PCB unit

35

YES Insert power plug.

NO

YES Replace it ( F-3)

NO

Contact between connector and 5 V lead wire defective?

NO

Output of 5V defect ive? :

NO .. I

connector

Replace ~--fuse

YES Replace it.

( ~ange 7.5 -13 VAC) IS normal.

Replace PCB unit

2. No initialization

START

H solenoid moves?

YES

Carrier unit returns to home position?

YES

Clutch moving spring OK?

YES

NO

Lubricate and adjust position of it.

NO

Gaps between home sensor u. and carrier u. abnormal?

NO

Contact between connector and LED or PH wire of home sense defective? (wrong position)

NO

Zero volts at LED line?

Repain PCB unit

36

YES Replace feed drum unit, head rope (L) unit and rope stopper, and lubricate.

Replace or reset it.

NO Lubricate guide pillar.

YES Replace it.

YES Adjust them.

YES Clean them or reset to correct position.

YES >-- Repair PCB unit

YES Replace it.

NO

Wrong position or bad contact between connector and lead wire of l8V? NO

Voltage abnormal on l8V line? , ,

YES

YES

YES

NO ( 'Range 20 -- 38VAC ) is normal

Voltage reaches H solenoid?

YES

H solenoid motion defective?

NO

H solenoid broken7

NO

Repair PCB unit.

NO

( ~7 -- 20VDC ) IS normal

YES

YES

37

Replace it .. (1.5A, F-2)

Clean them or reset to correct position.

Replace transformer.

Repair PCB unit

Adjust position of H solenoid.

Replace H solenoid.

3. The carrier unit does not move with a print command.

START

YES

NO

Correct position and Clean them or good contact between connector and motor reset it at lead wire? correct position.

YES Get rid of it and/or replace rotation Foreign object in detector, reduction gear train? gear, clutch, feed drum unit or rope

NO stopper.

18

NO

Motor lead wire set at wront position?

NO

Gear train abnormal?

NO

Replace feed YES drum unit, head rope (L) unit and rope stopper and lubricate.

Reset it

YES Reset or replace gear train.

YES Reset or replace it.

Motion of H solenoid defective? YES Adjust position of it.

Voltage reaches motor? , ,

YES

NO

YES ( ~7-20VAC) IS normal

Replace motor

Replace it.

Repair PCB unit

4. The carrier unit overruns

START

Wrong position or bad contact between Clean or connector and LED or reset them. PH wire of dot sense?

NO

Voltage on LED wire of home sense zero?

NO

Dot sensor unit setting abnormal?

No output of dot sense?

Wrong position or bad contact between connector and LED or PH wire of home sense.

NO

Voltage on LED wire of dqt sense zero?

No output of home sense?

YES

Repair CB unit

YES Repair PCB unit.

YES Adjust it.

NO >----- Replace dot sensor unit.

YES )--- Clean or reset them.

YES >---Repair PCB unit.

NO Replace )-------- home sensor unit.

5. Improper paper feed movement

39

START

YES Reset or clean passage of it.

YES Replace claw

Manually feeding paper by depressing LF solenoid too heavy?

NO

LF rope spring abnormal?

Function of reverse stop claw defective?

NO

Wrong position or bad contact between connector and lead wire of LF solenoid?

wheel unit.

Replace YES tractor shaft or lubricate its bearing.

YES Reset or replace it

YES Adjust it.

>----Adjust it.

YES

YES Replace it or reverse stop spring

Clean or reset it.

Replace it.

6. No printing or poor print quality

START

Proper position of print head unit?

NO

l----Set paper.

\---- Reset it.

Adjust ribbon feed )--__ board or replace ribbon cam or carrier unit.

>---- Replace it.

7. The upper or lower dots of printed characters are missing.

START

Proper position of dot sensor unit?

YES

NO Ad' . . f' JUst position 0 it.

Flexible cable properly inserted into head connector?

YES

Correct position and proper contact between pin connector and head board lead wire?

YES >-----Replace print head unit.

NO Proper voltage Repair on pin connector? PCB unit. " \--__ ~--.J- ... , ,(17 - 20 VDC ) YES isOK

Proper voltage NO Replace print on head connector? head unit. " '----~~Y:-=E':"S---' ........ , ... ( 17 - 20 VDC ) isOK

YES Replace print head unit.

Repair PCB unit.

Proper position between ridges of platen and rotation detector?

After removing gear pin from rotation NO detector and adjusting coupling position of reduction gear, adjust position of dot sensor unit.

YES Replace print head unit.

8. The upper and lower dots of printed characters are too light.

START

Proper position NO of print head unit?

NO

YES

Replace it.

9. Printings are too light.

Refer to "6. No printing or poor print quality."

10. Smudging by ribbon.

START

Proper position of print head unit?

YES

Any foreign object on platen or print head unit?

YES

Remove it and clean.

NO

NO

NO

41

Adjust it.

Reset it.

Replace print head unit.

Reset it. If ribbon is twisted, correct it.

Adjust it.

Repiace print head unit.