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EPSON TERM NAL PR NTER
LX-300
SERVICE MANUAL
(
)
EPSON
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) personal injury and 2) damage to equipment.
DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury.
Great caution should be exercised in performing procedures preceded by DANGER Headings.
WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautiomry measures itemized below should always be observed when performin grepair/ maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE. BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT
2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH
CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
1.
REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. AGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLT-
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECOND-SOURCE ICS OR (YI'HER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
- ii -
PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of LX-300. The instructions and procedures included herein are intended for the experience repair technician, and attention should be given to the precautions on the preceding page. The chapters are organizd as follows:
CHAPTER 1. PRODUCT DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of the pMter.
CHAPTER 2. OPERATING PRINCIPLES Describes the theory of printer operation. CHAPTER 3. DISASSEMBLY AND ASSEMBLY
Includes a step-by-step guide for product d isassembly and assembly.
CHAPTER 4. ADJUSTMENTS
Includes a step-by-step guide for adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides Epson-approved techniques for adjustment.
CHAPTER 6. MAINTENANCE
Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
APPENDIX
Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.
The contents of this manual are subject to change without notice.
-iv-
.......
REVISION SHEET
Revision
Rev. A
(
( j
Issue Date
April 6, 1994
Revision Page
1st issue
4
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TABLE OF CONTENTS
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6. APPENDIX
PRODUCT DESCRIPTION OPERATING PRINCIPLES DISASSEMBLY AND ASSEMBLY ADJUSTMENTS TROUBLESHOOTING MAINTENANCE
- vi -
CHAPTER 1 Product Description
Table of Contents
1.1 FEATURES 1-1
1-2 1.2 SPECIFICATIONS 1.2.1 Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.1.1 Paper Handling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.1.2 Paper Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.2.1.3 Printable Area.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1.2.1.4 Ribbon Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1.2.1.5 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1.2.1.6 Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1.2.1.7 Reliability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1.2.1.8 SafetyApprovals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1.2.1.9 Physical Specifications . . . . . . . ...'..... . . . . . . . . . . . . . . . . . 1-8 1.2.2 Firmware Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 1-11 1.3 INTERFACE SPECIFICATIONS 1.3.1 Parallel Interface Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 1.3.2 Serial InterfaceSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 1-14 1.4 OPERATING INSTRUCTIONS 1.4.1 Control Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14 1.4.2 Self-test Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 1.4.3 Hexadecimal Dump Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 1.4.4 PrinterStatus Indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 1.4.5 Selected Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 1.4.6 Paper Position Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 1.4.7 Printer Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.7.1 Hardware Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.7.2 Software Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.8 PrinterSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.8.1 Selectable PrinterSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.8.2 Changing the DefaultSettings. . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 1-21 1.5 MAIN COMPONENTS 1.5.1 Ct30 MAIN Board. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 1.5,2 C130 PSB/PSE Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
List of Figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 1-1. Exterior View of the LX-300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2. Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-3. PrintableArea forCut Sheets Using Manual Insertion. . . . . . . . . . . 1-5 1-4. Printable Area for Cut Sheets with the CSF. . . . . . . . . . . . . . . . . . . 1=6 1-5. PrintableArea forContinuous Paper . . . . . . . . . . . . . . . . . . . . . . . . 1-6 1-6. PrintableArea forRoll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-7. Data Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 1-8. Panel Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14 1-9. C130 MAIN Board Component Layout. . . . . . . . . . . . . . . . . . . . . . 1-21 1-10. C130 PSB/PSE Board Component Layout . . . . . . . . . . . . . . . . . 1-21
.P.::k f ('.
List of Tables
Table l-1. Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Table 1-2. Feeding Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Table l-3. Adjust LeverSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Table 1-4. Specifications for Cut Sheet Paper (Manual Insertion) . . . . . . . . . . . 1-4 Table 1-5. Specifications for Cut Sheet Paper (CSF). . . . . . . . . . . . . . . . . . . . . 1-4 Table l-6. Envelope Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Table 1-7. Specifications for Continuous Paper (Single Sheet and Multi-Part) . 1-4 Table 1-8. Specifications for Continuous Paper with a Label. . . . . . . . . . . . . . . 1-5 Table l-9. Roil Paper Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Table l-10. Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 Table 1-11, Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 Table 1-12. Character Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 Table 1-13. Printing Speed.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 Table 1-14, Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 Table 1-15 Signal and Connector Pin Assignments for the Parallel Interface. 1-12 (T Table 1-16. Signal and Connector Pin Assignments for the Serial Interface . . 1-13 Table 1-17 Font Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 `:""" Table 1-18 Font Lights and Language Selection. . . . . . . . . . . . . . . . . . . . . . . 1-17 Table 1-19 Default Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 Table 1-20 Character Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 Table 1-21 Shape of Zero. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 Table -22 Skip Over Perforation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 Table -23 Character Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 Table -24 Auto Line Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table -25 Page Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table -26 Auto Tear Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table -27 Tractor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table 1-28. Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table 1-29. Bit Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Table 1-30. Parity Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 Table 1-31. Data Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 Table 1-32. EWACK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l-2o
LX-300 Service Manual 1.1
Product Daadption
FEATURES
The LX-300 is a small, light-weight, 9-pin serial impact dot-matrix color printer suitable for personal use. The major features of this printer areas follows: 0 Fast printing of 10-cpi draft characters at 220 cps Cl Compact design saves precious workspace Cl Easy-to-operate panel LI Quiet printing CI Standard 8-bit parallel interface and EIA-232D serial interface D Printing of up to 66 lines on A4-size or 62 lines on letter-size paper ~ Optional color printing usinga color ribbon (black, magenta, cyan, yellow) ~ Detachable push and pull tractor Figure 1-1 shows an exterior view of the LX-300 and Table 1-1 lists the optional units available for the LX-300.
Edge guties ~
~p"perwppof's A
lease r
YA&
feed b Power
.. ./, w
Pfintercover
#/<
/'=5 A%
A
Print head
Sprocket unit
Paper Jpport
Troctof
-
Figure 1-1. Exterior"View of the LX-300 Table 1-1. Optional Units
I
I
I
Model
Description
Ribbon cartridge (monochrome) Ribbon cartridge (monochrome, sub-mtridge) , I Ribbon cartridge (color) Single-bin cut sheet feeder Color upgrade kit
[
I
#8750 #8758 S015073 C80837*
C83208* C80030*
I
Pulitractorunit
I
I
Rev. A
#8310
I Roil paper holder
I
1-1
a
Product Description LX-300 Sarvice Mimual
1.2 SPECIFICATIONS
This section provides detailed information about the LX-300.
/- . :.,, : ,.f
1.2.1 Hardware Specifications
Printing method: Pin configuration: Pin diameter: Serial impact dot matrix 9 wires 0.29 mm
Figure 1-2. Pin Configuration
Printing direction: Bidirectional with logic seeking for draft text with monochrome printing. Unidirectional printing for graphics, NLQ text, bit image, and color printing.
1-2
Rev. A
LX-XXI Sarvka Manual
Product Description
1.2.1.1 Paper Handling Specifications Feeding system: Feeding method Cut sheets: Continuous paper: Feeding pitch: Paper paths Cut sheet path: Continuous paper paths: Continuous paper parking: CSF: Paper-feeding speed: Friction feed or tractor (push and pull) feed Manual insertion (top entry) and feeding with the optional cut sheet feeder (CSF) Push and pull tractor feeding li~ in~, 1A in~, or pr~ammable feeding in in~ments of %16 inch, minimum Top entry (manual insertion or the optioml CSF) Rear entry (push tractor feed) Rear entry (pull tractor feed) Possible, using push tractor Single bin, manual insertion using optional CSF (top entry) See Table 1-2.
Table 1-2. Feeding Speed
Feeding Friction Tractor (single) Tractor (double) Friction feed q Set the release lever to the friction msition. . When a sheet is inserted into the t;p slot, place its left edge at the marked position. . Donotperform reverse feeds greater than O.27inch(6.8 mm). Push tractor feed . Set the release lever to the tractor position. . Donotperform reverse feeds greater than O.27 inch (6.8 mm). . During printing ofiabels, never perforrnreverse feeding. . After printing labels, do not eject them from the rear. Pull tractor feed 0 Remove the tractor unit from the push position and mount it in the pull position. q Do not perform reverse feeding. The adjust lever must be set to proper position for the paper thickness, as shown below. l/G inoh Line Feed 79 rns/line 96 redline
Continuous Feed
2.78 incheskecond 2.08 inoheakxond
Table 1-3. Adjust Lever Settings
Lever Position Paper Thickness 0.065 mm -0.16 mm (0.0026 in. -0.0063 in.) 0.16 mm -0.25 mm (0.0063 in. -0.0098 in.) 0.25 mm -0.48 mm (0.0098 in. -0.0189 in.)
o
1 b 2
Rev. A
14
Product Description
LX-WI Service Manual
1.2.1.2 Paper Specifications
,..
(i
Table 1-4. Specifications for Cut Sheet Papar (Manual Insertion)
Width Length Thickness Weight Quality 182 mm -257 mm (7.2 in. -10.1 in.) 182 mm -364 mm (7.2 in. -14.3 in.) 0.065 mm -0.14 mm (0.0025 in. -0.0055 in.) 52.3-90 g/m2 (14 -24 lb.) Plain paper, recycled paper
`-';
Table 1-5. Specifications for Cut Sheet Paper (CSF)
Size Thickness A4 (W x L: 210 mm (8.3 in.) x 297 mm (11.7 in.)) Letter ('W x L: 216 mm (8.5 in.) x 279 mm (11.0 m.)) 0.065 mm -0.14 mm (0.0025 in. -0.0055 in.)
Weight
QuaMy
64-90 @m* (17 -24 lb.)
Plain paper, recycled paper
Table 1-6. Envelope Specifications
Size Thickness Weight Quality Notes: Width 166 mm x Length 92 mm (6.5 in. x 3.6 in.) NO.6 No.1O Width 240 mm x Length 104 mm (9.5 in. x 4.1 in.) 0.16 mm - 0.48 mm (0.0063 in. -0.019 in.) 45-90 g/m2 (12 1-24 lb.) Bond paper (not curled, folded, or crumpled), plain paper, airmail paper . Printing of envelopes is guaranteed only when the temperature is room temperature and humidity is normal (15 - 25° C (59 - 77" F), 20- &l'Y. RI-I). q Variations in envelope thickness must be less than 0.25 mm (0.0098 in.). q When inserting envelopes, keep the longer side horizontal.
Table 1-7. Specifications for Continuous Paper (Single Sheet and Multi-Part)
Width 101.6 mm - 254 mm (4.0 in. - 10.0 in.) I I 0.065 mm- 0.25 mm (0.0025 in. - 0.0098in.) 52.3- 82 g/m2 14-22 lb. -- not multi-part 40- 58.2 g/m2 12 - 15 lb. -- multi-part ) [ 3 sheets (1 original + 2 copies) Plain paper, recycled paper, carbonless multi-part paper
I Total thickness
Weights copies Quality
I
(":.
14
Rev. A
LX-300 Service Manual
Prvduct Description
Table 1-8. Specifications for Continuous Paper with a Label
Label size (W x L) Width of base paper Thickness of base paper Total thickness Weight Quality Notes:
q
63.5 mm (min.) x 23.8 mm (min.) [ 2.5 in. (min.) x 15/16 in. (min.)] 101.6 mm -254 mm (4.0 in. x 10.0 in.) 0.07 mm - 0.09 mm (0.0028 in. - 0.0035 in.) 0.16 mm - 0.19 mm (0.0063 in. -0.0075 in.) 64g/m2(17 lb.) Plain paper
I
Use only continuous-type labels and use them only with the tractor. -- Avery Continuous Form Labels q Example of labels -- Avery Mini-Line Labels q Printing of envelopes is guaranteed only when the temperature is room temperature and humidity is normal (15 - 25° C (59 - 77° F), 20- 6(YXO RI-l).
Table 1-9. Roll Paper Specifications
Width Diameter Thickness Weiaht 213 mm -219 mm (8.38 in. -8.62 in.) 127 mm (5.0 in.) 0.070 mm -0.090 mm (0.0028 in. - 0.0035 in.)
I 52- 64a/m2 (14 -17 lb.)
I
1.2.1.3 Printable Area Cut shaets using manual insartion 3 mm [0 1%], nym.m
\ . . . . . . . . . . . . ,.. - . . ,
Printable Area
209.2 mm 10~. MEximum 3 mm [0.12']. Ilirimbm
--
F
BC
XYz
7
--
--
BC L
)wz -J
Figure 1-3. Printable Area for Cut Sheets Using Manual Insertion
Rev. A
1-s
Product Description
LK300 Service Manual
Cut Sheets Using the (XF
3 mm 10.12"1. mm,mum
L
BC
A
XY
101.6 t-m-n - 2S4 nun [4" - 10~, masinwm
Figure 1-4. Printable Area for Cut Sheets Using the CSF
Continuous paper
1
0 0 o
I
1: 0
0 0 0 0 0 0 0 0 0 0 0
42 0
0 0 0 0 0 0 o 0 0 0 0 0 0
0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
f"'. - .;.
PfintaM9 Area
0 0 0 0 0 a o 0 0
0
0 0 0 a o 0 0 0 a o a a a a a a a --
" 13 mm (0.51") or more whm ppar wid?h of 101.6 MM (4-) to 241.3 mm (9.5-) is usd 30 mm (1. W) w mwe when w w+dth of 2S4 mm (10.) is usad.
Figure 1-5. Printable Area for Continuous Paper
14
Rev. A
LX4tW Service Manual Roll paper
213 mm -219 mm [8.38' - 8.62'] 3 mm [0.12" minimum w 203.2 mm [8'J maximum * ) >
Prvduct Description
I
Printable Area
I
m
` 9.8 mm (0.39") or more
when a paper widthof216 f 3 mm is used.
Figure 1-6. Printable Area for Roll Paper
1.2.1.4 Ribbon Specifications
Ribbon cartridge (mono): Ribbon cartridge (color): Ribbon color: Black ribbon life: Color ribbon life Black: Magenta: Cyan: Yellow:
#8750 #8758 (sub-cartridge)
S015073 Black, magenta, cyan, yellow 3 million characters (14 dots/character) 1 million characters (14 dots/character) 0.7 million characters (14 dots/character) 0.7 million characters (14 dots/character) 0.5 million characters (14 dots/character)
Rev. A
1-7
Product Description
LX-300 Service Manual
1.2.1.5 Electrical Specifications
Table 1-10. Electrical Specifications Description
Rated voltage Input voltage range
r
120 V Version 120 VAC 103.5-132 VAC
220-240 V Version 220-240 VAC 198-264 VAC 50-60 Hz 49.5 -60.5 Hz
Rated frequency range Input frequency range Rated current Power mnsumption Insulation resistance Dielectric strength 1.0 A
0.5 A
30 W (self-test in 10 cpi draft) 10 MQ, minimum (applying 500 VDC between AC hne and chassis) 1.0 MK2, minimum (a~A~~{e500 VDC between and CkSSIS)
1000 VAC ma for 1 minute or 1500 VAC rrps for 1 minute (&~O~v:~C~&d~~~s) (between AC hne and chasa.s)
1.2.1.6 Environmental Conditions
Table 1-11. Envh'onmental Conditions Description
Temperature Humidity Resistance to vibration 5to 35°
Operating
Storage
20to 55° c (-4 - 131° F) (*2) 5 to 85% RH (*2,*3) 0.50 G, 55
Hz
c (41 - 95° F) (*1)
Hz (*1)
30 to 80% RH (*1,*3) 0.25 G, 55
(*2)
*1= Operating conditions must be within this range. *2= When the printer is in the shipping container. *3 = Without condensation.
1.2.1.7 Reliability
M'T'BF: Printhead life: 4000 power on hours (POH) 200 million strokes/wire (with monochrome ribbon) 100 million strokes/wire (with color ribbon)
J.
[;'
1.2.1.8 Safety Approvals Safety standards: U.S. version: European version: UL1950 with D3, CSA22.2 #950 with D3 EN 60950 ~) IEC950 (SEMKO, DEMKO, NEMKO, SETI) FCC part 15 subpart B class B Vfg.243 (VDE0878 part 3, part 30) EN55022 (CISPR PUB. 22) class B
Radio frequency interference: U.S. version: European version: (RFI)
1.2.1.9 Physical Specifications
Dimensions (W x D x H): Weight: 366 x 275 x 132 (mm) (14.4 x 10.8 x 5.20 (inches) (without pull tractor) 4 kg (8.8 lb.) without pull tractor
, :; , . .,
1+
Rev. A
LX-3(M Service Manual
Ptvduct Lkacription
1.2.2 Firmware Specifications
Control codes: Input data buffer: Character sets: Character tables: EsC/r 4KB 13 international character sets See the table below.
Table 1-12. Character Tables
Character Table ITALIC PC437 (US, Standard Europe) PC850 (Multilingual) PC860 (Portuguese) PC861 (Icelandic) PC863 (Canadian-French) PC865 (Norwegian) BRASCII Abicomp PC852 (East Europe) PC853 (Turkish) PC855 (Cyriliic) PC857 (Turkish) PC866 (Russian) PC869 (Greek) PC437 Greek
ISO Latin IT (Turkish)
Standard Model o o o o o o o o o x x x x x x x x x x x x
NLSP* Model
0 0 0 x x x x x x o o o o
o o o o o
ISO 8859-7 (Greek) Code MJK (Czecho, Slovakia) MAZOWIA (Polland) Bulgaria (Bulgaria)
X Not supported 0 Suppofted * N~P= National Language Support LS Bitmap fonts: EPSON NLQ Roman EPSON NLQ Saris Serif EPSON DRAIT
o o o
Character size Character matrix Print mode Draft mode: NLQ mode: Printing speed: Printable columns: Rev. A
10.5 points Draft 10 cpi; 11 horizontal dots, 9 vertid dots NLQ 10 cpi; 23 horizontal dots, 18 vertical dots Double-width Double-strike Super/subscript Double-width Italics See Table 1-13. See Table 1-13. 1-9 Condensed Underlined Emphasized Italics
Emphasized Underlined Super/subscript
Product Description
LX-W) Service Mhnual
Table 1-13. Printing Speed Printing Mode
Draft Draft Draft condensed Draft condensed Draft emphasized Draft double width NLQ NLQ NLQ double width Notes:
Ch~m&:er
10 cpi 12 cpi 17.1 cpi 20 cpi 10 cpi 5 cpi 10 cpi 12 cpi 5 cpi
Printable Columns
80 96 137 160 80 40 80 96 40
Maximum Print Speed [cps] Monochrome
220 (165) 264 (198)
(
.
`x:
i
,:'
Color
165 (1 65) 198 (198)
188 (141) 220 (165) 110 (83) 110 (83) 44 (33) 53 (40) 22 (16)
Data in parentheses indicates the speed on a line containing at least one of the following: - A line containing a userdefined character. - A linecontaining oneofthe50 characters corresponding tohexcodes BO to DFand F4 and F5. - A line that is printing when printhead driving voltage drops from over-duty printing. (When voltage drops below the lower limit, the printer stops printing in the middle of the line, and then prints the rest of the line at a slower speed.)
Table 1-14. Resolution
Printing Mode Draft Draft condensed Draft emphasized NLQ Horizontal Density 120 dpi 240 dpi 120 dpi 240 dpi 60 dpi 72 dpi 80 dpi Bit image 90 dpi 120 dpi 120 dpi 240 dpi Vertical Density 72 dpi 72 dpi 72 dpi 144 dpi 72 dpi 72 dpi 72 dpi 72 dpi 72 dpi 72 dpi 72 dpi Adjaoent Dot Print No No Yes No Yss Yes Yes Yes Yes No No
~.:?";,
`---
1-10
Rev. A
LX-3(3O Service Manual
Prvduct Description
1.3 INTERFACE SPECIFICATIONS
has parallel interface and serial interface, one of which can be selected in default setting mode. Auto selection is also available.
LX-300
1.3.1 Parallel Interface Specifications
The LX-300 is equipped with an 8-bit parallel interface, standard.
Data format: Synchronization: Handshaking: Signal level: Adaptable comectm Data transmission timing:
BUSY
ACKNLG
8-bit parallel By SIROBE pulse SyIIChrOIliZZItiOll By BUSY and ACKNLG signals TTL-compatible level %-pm 57-30360 (Amphenol) or equivalent See Figure 1-7.
DATA S T R O B E ---- -- h 0.5 ps (minimum) 0.5 ps (minimum) 0.5 IIS (minimum)
Figure 1-7. Data Transmission Timing
Note:
Transition time (rise time and fall time) of every input signal must be less than 0.2 M.
The Busy signal is active (HIGH) under the following conditions: - During data reception (See Figure 1-7.) - When the innt buffer is full - When the INIT input signal is active - During initialization - When the ERROR signal is active - During the self-test mode - During the default-setting mode The ERROR signal is active (LOW) under the following conditions: - When a paper-out error occurs - When a release lever operation error occurs - When a fatal error occurs The PE signal is active (HIGH) under the following conditions: - When a paper-out error occurs
Rev. A
1-11
I
-1 . . . --. [ }.. . I I ~ .
~s and signal functions for the 8-bit parallel interface.
Pin Assignments for Parallel Interface
Description The STROBE pulse is used to read the input data. The pulse width must be more than 0.5 p.s. Input data is latched after the falling edge of this signal. Parallel input data to the printer. A HIGH level means data 1. A LOW level means data O. This pulse indicates data has been received and the printer is ready to accept more data. The pulse width is approximately 12 pa. HIGH indicates the printer cannot accept more data. HIGH indicates rm~er-out. This signal is effective only when the ERROR signal is LOW. Always HIGH output. (Pulled up to +5V through 3.3 KQ resistor.) If the signal is LOW when the printer is initialized a line feed is automatically petformecf upon receipt of the CR code (auto LF). Not USed.
... .. --. --- ,, -- .-. . ..--
I i
I
!.
f
11 1
L
.
Signal ground. Chassis ground. In the printer, chassis ground and signal ground are short-circuited. A HIGH level means that printer power is on. Signal ground. Input for printer initialization. Pulse width 50 ~ minimum, active LOW. LOW indicates that some error has occurred in the printer. Signal ground.
.--
-.. .
Pulled up to +5V through 1 KQ resistor.
.: . ! .
Ignored. . . ~ f$e .,, ~ · ., s@f@ as viewed from the @ter.
,,
. .
Rev. A
LX-3(IO Service Manual
Product Description
1.3.2 Serial Interface Specifkations
The LX-300 is equipped with an 8-bit serial interface, standard. Data format: Synchronization: Handshaking: EIA-232D serial Asynchronous By DTR signal and X-ON/X-OFF protocol
DTR and X-OIVX-OFF Protocol
State Busy Ready
Buffer Space
Less than 256 bytes More than 512 bytes
DTR
off On
X-OWX-OFF
X-OFF X-ON
ETX/ACK Protocol
State Busy Ready Word length Start bits: Data bits: Parity bit: Stop bits: Bit rate: Logic level MARK (logical 1): SPACE (logical O): Parity check: Connector: Buffer Spaoe Less than 256 bytes 256 bytes or more
Response Code
NAK ACK
1 bit 7 or 8 bit (selectable) O or 1 bit (selectable) 1 bit (transmitting) 1 bit or more (receiving) 300, 6(X), 1200,2400,4800,9600, 19200 bps (selectable) 3 V to 25 V +3 v to +-25 v Odd, even, or no parity bit (selectable) EIA standard 25-pin D-SUB female comector
Table 1-16. Signal and Connector Pin Assignments for Serial Interface
Pin No.
1
Signal Name FG TXDJSD RXDIRD RTS/RS CTSVCS SG DTWER NC
110*
Description Chassis ground. Transmit seriil data. Receive serial data. This signal is always at the positive EIA level. Ignored. Return path for data and control signals. This signal is at the positive EIA level when the printer is ready to accept data entry and at the negative EIA level when the printer is not ready to accep t data entry. No connection (not used).
--
out
2 3 4 5 7 11,20 6,8-10,1219,21-25
q
In
out
In --
out
--
The //0 column irxbtes the djrectkm d the sjgnal as vjewed from the printec
Rev. A
1-13
Product Description
UiWtJ Service Mhnual
1.4 OPERATING INSTRUCTIONS
This section describes control panel operation ~ctions, demonstration functions, and printer initialization methods. self-test, hexadecimal dump,
." "II
~n ~~
1.4.1 Control Panel Operation
The printer control panel contains three non-lock-type push buttons and three LED indimtors for easy operation of the various printer functions.
Lights /
Roman O O Saris SerifO q Draft. Draft o
q I
Buttons
A
Light /
Font
Condensed.
2
q
o Q 3sec
I W W Micro Adjust
,, .
Figure 1-8. Panel Apperance
Paper Feeding Load: Load (manual insertion): Line feed: Eject cut sheet: Form feed (continuous): Paper park (continuous): Tear-off (continuous): Character Selection Font selection: Pitch selection: Condensed selection: Enter Speaal Mode Self-test mode: Default-setting mode: Hex dump mode: Demonstration mode: Hold down the LF/FF button and turn on the printer. Hold down the FONT button and turn on the printer. Hold down the LF/FF and FONT button and turn on the printer. Not available. Press the FONT button. Selectable indefault-setting mode: 10 cpi. or 12 cpi. Press the FONT button. Only draft condensed is selectable. Press the LF/FF button. Press the LF/FF button or the printer waits 2 seconds after insertion of a cut sheet to load paper automatically. Press the LF/FF button once. Hold down the LF/FF button continuously. Hold down the LF/FF button continuously. Press the FONT and LF/FF buttons at the same time. Only uses auto tear-off function.
L
~..,, .
1.4.2 Self-test Function
This section explain how to run the self-test. 1. Hold down the LF/FF button and turn on the printer to start the self-test. 2. If paper is not loaded, the printer attempts to load it. 3. If the printer camot load paper, it indicates this by turning on the PAUSE light. In this case, insert paper again and press the LF/FF button. 4. The printer prints alphanumeric characters continuously. 5. Quit self-test mode printing by pressing the PAUSE button and turning the printer off. 1-14 Rev. A
LX#O Service Manual
Pfvduct LMacription
1.4.3 Hexadecimal Dump Function
The hexadecimal dump is a useful tool for troubleshooting data control problems. This section describes how to run a hex dump. Turn on the printer while holding down the LF/FF and FONT buttons. 2. If paper is not loaded, the printer attempts it (either single sheet or continuous paper). 3. If the printer cannot load the paper, it indi~tes a paper-out error. In this case, insert paper again, and press the PAUSE button. 4. The printer waits for data after printing the message "Hex dump." 5. Received data is printed as both hexadecimal codes and ASCII characters. If a corresponding printable character does not exist, the printer outputs a period (.).
6. Quit hexadecimzd dump printing by pressing the PAUSE button and tumingtheprinter off.
1.
Note:
In hex dump mode, the character table depends on the default settin& and 10 cpi draft is selected automatically.
1.4.4 Printer Status Indication
It describes how this printer indicates status and error conditions using LEDs and the beeper. The symbols below describe the frequency of beeper sounds. ( q ): The beeper sounds tbr 100 rns with an interval of 100 ms between beeps. (--): The beeper sounds for5~mswithan interval of100ms between beeps. While initialize signal is active: During initialization: Ready to print or printing: Paper-out error: Tear-off: Operating error, fatal error: PAUSE light is on. PAUSE light blinks and beeper sounds PAUSE light is off Beeper sounds ( q q . ) and PAUSE light blinks. (light on:off ratio= 6:1) PAUSE light blinks (light on:off ratio= 1:6) Beeper sounds ( ---------- ) and PAUSE light is on.
1.4.5 Selected Font
The combination of two FONT LEDs (1 and 2) is used to indicate the selected font.
Table 1-17. Font Selection
Selected Font Roman Saris Serif Draft Draft condensed FONT 1 ON ON OFF OFF FONT 2 ON OFF ON OFF
1.4.6 Paper Position Adjustments
To enter adjustment mode, press the PAUSE button for three seconds, until the printer beeps once and the FONT lights blink to indicate that the adjustment operation is available. If the printer state is not one of the conditions shown below, this operation is ignored. . TOF position adjustment: The position mn be adjusted just after the paper is loaded. . Tear-off position adjustment: The position can be adjusted when paper is actually located at the tear-off position. In the adjustment mode, press the LF/FF button to feed paper forward and the FONT button to feed paper backward. You can cancel adjustment mode bypressingthe PAUSE button or inputting a print command. The adjusted position is stored in non-volatile memory.
Rev. A
1-15
Product Description
LXiWO Service Manual
1.4.7 Printer Initialization
There are two types of initialization: hardware initialization and software initialization. 1.4.7.1 Hardware Initialization Hardware initialization is performed by: . Turning on the printer. . Sendiny@e parallel interface the~signal. (If the INIT signal is active when the printer is turned on, hardware initialization is started when the ~ signal becomes imctive.) When hardware initialization is performed: . The printer mechanism is initialized. . Print data in the input buffer is cleared. . Download character definitions are cleared. . The printer's settings are returned to the defaults. . The printer is set to the standby condition, if no fatal error occurs. . Continuous paper home-seeking is performed. In continuous paper home-seeking: . The printer feeds continuous paper to the paper park position. q The printer then loads the paper again. q If ejection to the paper park position cannot be completed within 16 inches, paper is returned to its previous position.
1.4.7.2 Software Initialization
Software initialization is performed upon receipt of the control code ESC C?. When software initialization is performed: . Print characters in the buffer are not cleared. . The printer setting is changed to the default, but the download character definition is not cleared.
1.4.8 Printer Settings 1.4.8.1 Selectable Printer Settings
The following printer settings can be changed by users in default-setting mode: Character spacing: Shape of zero: Auto line feed: Character table (Standard): Character table (NLSP): .lQc@ / 12cpi Slashed / Not slashed on/Qff Italic (JJSA/France/Germany/UK/Denmark l/Sweden/Italy/ Spain 1)/PC437/850/860 /861/863 /865/BRASCII/Abicomp Italic &?SA/France/German y/UK/Denmar k l/Sweden/Italy/ Spain 1)/KG7/~/S2/8S/E5 /857/=/869/07 Greek/ISO Latin IT /1S0 8859-7/Code MJK/Mazowia/Bulgaria 11/ 12/ 8.5 / 70/6 inches on/Qff Single / Double ~/ Auto selection (30 sec wait) / Parallel / Serial 300 / 600/ 12(MI / 2400 / 4800 / $?6Ul / 19200 bps Mm/ Odd / Even Z.Ms / 8 bits ~ / Enabled
... ~? .....
1 inch skip-over-perforation: on/Qff
Page length: Auto tear off: Tractor: interface: Bit rate (serial I/F): Parity bit (serial I/F): Data length (serial I/F): ETX/ACK (serial I/F): Note: 1-16
Underlines show factory setting. Rev. A
LX-300 Service Manual
Product Description
1.4.8.2 Changing the Default Settings
You can change some parameters that the printer refers to at printer initialization. 1. To enter the default setting mode, turn on the printer while holding down the FONT button. The printer prints out the firmware version. If paper is not loaded, insert a sheet of paper.
2. The printer automatically loads the paper and prints a table of languages to choose from: English, French, German, Italian, and Spanish. The Footlights indicate the currently selected language, as shown in the table below.
Table 1-18. Font Lights and Language Selection
FONT Light 1 OFF OFF ON ON ON FONT Light 2 ON Blinks OFF ON Blinks Language English French German Italian Spanish
3. Press the FONT button to change the language, and press the LF/FFbutton to select. 4. Press the FONT button again after selecting a language. The printer prints help text to guide you in setting defaults. The pMted instructions include submenu tables listing all the settings you can change and showing you how the mntrol panel lights appear for each selection. 5. To change the settings, press the FONT button to move down and press the LF/FF button to move up in the menu of options shown below. The printer beeps once each time you press the FONT button while you are in this menu.
Table 1-19. Default Options
FONT Light 1 Blinks Biinks OFF ON Blinks Biinks Blinks OFF ON Blinks OFF Biinks ON
6. 7. 8. 9.
FONT Light 2 PAUSE Light OFF ON Biinks Blinks Blinks OFF ON Blinks Blinks Biinks OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON Biinks Biinks Biinks
Setting Character spacing Shape of zem Skip over perforation Character table Auto line feed Page iength Auto tear off Tractor Interface Bit rate Parity Data length ETWACK
Submenu Table 1-20 Table 1-21 Table 1-22 Tabie 1-23 Tabie 1-24 Table 1-25 Tabie 1-26 Table 1-27 Table 1-28 Table 1-29 Table 1-30 Tabie 1-31 Table 142
When you reach the setting you want to change, press the PAUSE button once. The printer automatically enters the submenu for that setting. Press the FONT button to move the through the settings in the submenu. The printer beeps twice each time you press the FONT button while in a submenu. When the lights match your desired settin~ press the PAUSE button to make your selection. The printer saves the new setting and returns to the menu shown above. Repeat steps 5 through 8 for each additional setting you want to change, or skip to step 10 to exit the printer's defauit setting mode.
10. When you are finished, turn the printer off. Any settings you have made remain in effect until you change them again. Rev. A 1-17
Product Description
LX300 Service M%ual
Table 1-20. Character Spacing FONT Light 1 OFF ON FONT Light 2 PAUSE Light OFF ON OFF ON Character Spacing 10 cpi 12 cpi A
Table 1-21. Shape of Zero FONT Light 1
OFF ON FONT Light 2 OFF ON PAUSE Light OFF ON Space of Zero o 0
Table 1-22. Skip Over Perforation
FONT Light 1 OFF
ON
FONT Light 2 PAUSE Light
OFF ON
SkipOver-Petioration No Skip
OFF
ON
skip
Table 1-23. Character Table
FONT Light 1 OFF ON Blinks OFF ON Blinks OFF Blinks OFF ON Blinks OFF ON Blinks OFF ON Blinks
OFF
FONT Light 2 PAUSE Light OFF OFF OFF ON ON ON Blinks Blinks OFF OFF OFF ON ON ON Blinks Blinks Blinks OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON ON Blinks Blinks Blinks Blinks Blinks
Standard Table Italic -- US Italic -- France Italic -- Germany Italic -- UK Italic -- Denmark 1 Italic -- Sweden Italic -- Italy Italic -- Spain 1 Pc 437 PC 850 PC 860 Pc 861 PC 863 PC 865 BRASCII Abicomp -- -- -- -- -- --
NLSP Table Italic -- US Italic -- France Italic -- Germany Italic -- UK Italic -- Denmark 1 Italic -- Sweden Italic -- Italy Italic -- Spain 1 Pc 437 PC 850 PC 852 PC 853 Pc 855 PC 857 PC 866 PC 869 PC 437 Greek ISO Latin IT 1s0 8859-7 Code MJK Mazowia Bulgaria
1
ON Blinks OFF ON
.,
1-18
Rev. A
LX-3(IO Service Manual
Product Lkactiption
Table 1-24. Auto Line Feed FONT Light 1 FONT Light 2 PAUSE Light
OFF ON OFF ON OFF ON
Auto Line Feed
off On
Table 1-25. Page Length FONT Light 1 ON
OFF ON OFF
FONT Light 2 PAUSE Light
OFF ON ON OFF OFF OFF OFF ON
Page Length
11 inches 12 inches 8.5 inches 70/6 inches
Table 1-26. Auto Tear Off
FONT Light 1 OFF ON FONT Light 2 OFF ON PAUSE Light OFF ON Auto Tear Off off On
Table 1-27. Tractor
FONT Light 1 OFF ON FONT Light 2 OFF ON PAUSE Light OFF ON Tractor Single Double
Table 1-28. Interface FONT Light 1 FONT Light 2 PAUSE Light ON
OFF ON OFF OFF ON ON OFF OFF OFF OFF ON
Interface
Auto selection (10 me wait) Auto selection (30 rns wait) Parallel Serial
Table 1-29. Bit Rate
FONT Light 1 ON
ON
FONT Light 2 PAUSE Light OFF
ON
Bit Rate 300 b~ 600 bps 1200 bps 2400 bps
OFF OFF OFF ON
ON OFF
ON I
ON OFF OFF ON ON
I
ON ON ON
I
4800 tx)s
OFF ON
9600 bps 19200 bps
Rev. A
1-19
Product Description
U-300 Service Manual
Table 1-30. Parity Bit
FONT Light 1 ON ON ON FONT Light 2 OFF ON ON PAUSE Light OFF OFF OFF Even
,
Parity Bit None
((''"
Table 1-31. Data Length
FONT Light 1 OFF ON FONT Light 2 OFF ON PAUSE Light
OFF
Data Length
7 bits 8 bits
ON
Table 1-32. ETX/ACK
FONT Light 1 OFF ON FONT Light 2 OFF ON PAUSE Light OFF ON ETX/ACK off On
~ .,...., ,. ..,,-,.
1-20
,.
Rev. A
LX-3(IO Sarvice Manual
Ptvduct Daactiption
1.5 MAIN COMPONENTS The
main components of the LX-300 is designed for easy removal and repair. The main components are; s C130 MAIN BOARD: Control board s C130 PSB/PSE (120V / 220-240V) BOARD: Power supply board s M-3G1O: Printer mechanism 9 Housing 1.5.1 C130 MAIN Board The C130 MAINboard consists of an E01A09 (CPU), a Program/CG ROM, a RAM, an EEPROM, etc. PROM (Program 1 CG) 2SC5060 (PF MOTOR Driver) I
n--
E01A09 (CPU) \ y /- 2SC5~ 000 00 > (Printhead Driver) /'
00 000
0
0 % 0
SLA7022M (CR MOTOR
UPC78M05AHF
(Regulator IC)
DRIVER) SUB PCB (COLOR OPTION)
Figure 1-9. C130 MAIN Board Component Layout 1.5.2 C130 PSB/PSE Board
The C130 PSB/PSE power supply board consists of a transformer, switching FETs, regulate IC, diode bridge, etc. This board has two ratings for input AC voltages.
Switching FET Transformer
Diodde Bridge Power Switch
Fuse
0
u
0
/
"
o \
)
Regulater IC Figure 1-10. C130 PSB/PSE Board Component Layout
Rev. A ,,
1-21
(
CHAPTER 2 Operating Principles
Table of Contents
2-1 2.1 PRINTER MECHANISM OPERATION 2.1.1 Printing Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.2 Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.1.3 Paper Handling Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.1.3.1 Paper Feed Mechanisms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.1.3.2 Paper Advance Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.1.4 Ribbon Advance Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 2.1.5 Ribbon Shift Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2.1.6 Platen GapAdjustment Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2-1o 2.2 POWER SUPPLY OPERATION 2.2.1 Power SupplyOvefview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2.2.2 Power Supply Circuit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2-12 2.3 CONTROL CIRCUIT 2.3.1 Control Circuit Operation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2.3.2 Power On Reset Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 2.3.3 Home Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 2.3.4 Paper End Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 2.3.5 Release Lever Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 2.3.6 Carriage MotorDriveCircuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 2.3.7 Paper Feed MotorDriveCircuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 2.3.8 Printhead Drive Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 2.3.9 Interface Circuit.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 2.3.10 EEPROM Control Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 2.3.11 CSMotorAssembly Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 2.3.12 Color Ribbon SensorCircuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
List of Figures
Figure 2-1. iSrintheadoperation principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . z-l Figure 2-2. [:arriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Figure 2-3. IFriction Advance Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Figure 2-4. I~ush Tractor paper Advance Mechanism . . . . . . . . . . . . . . . . . . . . 2-4 Figure 2-5. Ipu~Tractor paper Advance Mechanism . . . . . . . . . . . . . . . . . . . . . 2-5 Figure 2-6. IPush-Pull Tractor PaperAdvance Mechanism . . . . . . . . . . . . . . . . . 2-6 Figure 2-7. IPaper Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .2-6 Figure 2-8. IRibbon Advance Gear Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Figure 2-9. (ColorShift Mechanism.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Figure 2-10 Platen GapAdjustment Mechanism . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Figure 2-11 Power Supply Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . 2-11 Figure 2-12 Control Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Figure 2-13 Power On Reset Circuit Diagram. .,..... . . . . . . . . . . . . . . . . . 2-13 Figure 2-14 HomePositionSensorCircuit Diagram . . . . . . . . . . . . . . . . . . . . 2-13 ,. Figure 2-15. PaperEndSensor Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . 2-14 (f ` K..d Figure 2-16 Release Lever Position Sensor Circuit Diagram . . . . . . . . . . . . . 2-14 Figure 2-17 Carriage Motor DriverCircuit Diagram . . . . . . . . . . . . . . . . . . . . . 2-15 Figure 2-18 Paper Feed Motor DriverCircuit Diagram . . . . . . . . . . . . . . . . . . 2-16 Figure 2-19 Printhead Driver Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 Figure 2-20 Parallel Interface Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 Figure 2-21. Serial interface Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 Figure 2-22 EEPROM Control Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . 2-18 Figure 2-23 CSMotorAssemblyCircuit Diagram . . . . . . . . . . . . . . . . . . . . . . 2-18 Figure 2-24 Color Ribbon SensorCircuit Diagram . . . . . . . . . . . . . . . . . . . . . 2-19
List of Tables
Table Table Table Table Table Table Table Table Table 2-1. CR Motor Assembly Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-2. PF Motor Assembly Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2-3. Ribbon Advance Gear Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 2-4. CS Motor Assembly Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2-5. Coloring Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2-6. Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-7. Power Supply Output Voltages and Applications . . . . . . . . . . . . . . 2-10 2-8. Functions of the Main IC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2-9. Carriage Motor Drive Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 ~ f=::, -..
LX-3(XI Service Manual
Operating Ptinciph3
2.1 PRINTER MECHANISM OPERATION
l%is section describes the M-3G1O printer mechanism and explains how it works.
2.1.1 Printing Mechanism
The printer mechanism is composed of the printhead, ink ribbon, and ribbon mask. The printhead is a 9-pin head for impact dot printing. Each wire has own drive coil, which causes the wire to move in and out of the printhead to print each dot. The four steps below describe how these driving wires work. 1. A drive signal transmitted from the control arcuit to the printhead drive arcuit is converted to the proper printhead driving voltage, which energizes a corresponding coil. The energized coil then causes the iron core to become magnetized.
2. The magnetic force draws the actuating plate toward the core, and the dot wire, which is comected to the core, rushes toward the platen. 3. When the dot wire impacts the platen, pressing against the ribbon and paper, it prints a dot. 4. When the driving voltage stops energizing the coil, the magnetic force from the iron core vanishes. The actuating plate returns to its original position (the position betbre coil was energized) with spring action. The dot wire also returns to its original position. This is the sequence used to print a single dot. The mechanism is equipped with a built-in thermistor for head temperature detection. The temperature detected by the thermistor is converted to an electric signal and fed back to the control circuit.
Wire Resettin S rin Stopper Dot Wire
T'Y____ r
\Actuating Spring Figure 2-1. Printhead Operation Principles
Rev.A
2-1
Operating Principles
LX-WI Service Mimual
2.1.2 Carriage Movement Mechanism The carriage movement mechanism consists of the carriage assembly, CR motor assembly, timing belt, driven pulley, HP sensor, etc. The CR motor assembly drives tie tifig belt. me carriage assembly is comected to the timing belt, which is moved by the CR motor assembly. Figure 2-2 shows the carriage movement mechanism. The printer detects the carriage home position with the HP sensor. This sensor is the basis for determining the carriage home position. The HP sensor informs the CPU of the carnage home position. The sensor is ON, when the carriage is pushed to the right or left. The striker on the carriage actives the sensor to indicate the carriage home position, which toggles the sensor to OFF.
Table 2-1. CR Motor Assembly Specifications
Category Type Drive Voltage Coil Resistance Drive Pulse Frequency Excitation Method 31.5 -38.5 VDC 180 ohms * 7Y0 (per phase, at 25° C, 77° F) 1320 p~ Normal Mode Draft 1980 PPS Color Mode Draft Constant-voltage 2-2 phase excitation 1-2 phase excitation Requirement 4-phase, 48-pole, PM-type stepping motor
CARRIAGE ASSY.,
TIMING BELT
.,,CR
Figure 2-2. Carriage Movement Mechanism
2-2
Rev.A
LX-300 Sewica Manual
Operating Principla
2.1.3 Paper Handling Mechanism
During normal operation, the paper is fed to the printer, advanced to the specified position, and ejected from the printer. These paper handling operations are performed by various paper handling mechanisms, such as the tractors, rollers, and gears. This section describes the paper handling mechanism for this printer.
2.1.3.1 Paper Feed Mechanisms
Cut sheets are fed by friction. Continuous paper is fed by a tractor. There are three ways to feed with tractors: the push tractor method, the pull tractor method, and the push-pull tractor method. During normal operation, the printer is set up with only one tractor, which functions as either a push or a pull tractor, depending on where it is attached on the printer. To use the push-pull tractor feed method, an optional tractor must be attached. There are two ways to insert paper into the printer. Cut sheets use the top entrance and continuous paper use rear insertion.
2.1.3.2 Paper Advance Mechanism
This section describes how the friction and tractor advance mechanisms feed paper through the printer. The paper advance mechanism consists of the PF motor assembly, platen, dtiven roller assembly, driven roller cover, tractor assembly, knob, PF gear train, etc. The PF motor assembly can drive the platen both forward and in reverse.
Friction Advance Method
Paper is held by the platen, the PF driven roller, and the eject roller assembly. Turning in the direction of the black arrows, the PF motor assembly pinion gear drives the paper advance reduction gear. The paper advance reduction gear turns the platen gear, PF driven roller, and the platen. The platen drives the driven roller cover; then the driven roller cover drives to eject the paper. The paper advances in the direction of white arrows. Figure 2-3 shows the friction advance method when the paper is fed through the top paper entrance.
COVER, ROLLER, DRIVEN
,,
PAPER ADVANCE REDUCTION GEAR MOTOR ASSY.,PF ROLLER, PF,DRIVEN
PLATEN GEAR Pinion Gear
Figure 2-3. Friction Advance Mechanism
Rev.A
2-3
Operating Principles
LX-300 Service Manual
Table 2-2. PF Motor Assembly Specifications Categov
Type
Requirement
4-phase, 48-pole, PM-type stepping motor 31.5 -38.5 VDC 56 ohms f 5Y0 (per phase, at 25°C, 77°F) 800,900,1000,1200,1300 pps Constant-voltage 1-2 phase excitation
Drive Voltage Coil Resistance Drive Pulse Frequency Excitation Method
Push Tractor Method
When the push tractor method is used with the rear entrance, the torque generated by the PF motor assembly is transmitted to the push tractor gear through the PF motor assembly pinion gear, the paper advance reduction gear, and the tractor transmission gear. When the PF motor assembly pinion gear turns in the direction of the black arrows, the tractor gear rotates in the direction of the black arrow and thus feeds the paper into the printer. The paper is advanced by the platen, which is also driven by the PF motor assembly through the gear train.
('*.,-,
Continuous Paper /
Push
Tractor
. . . . .~'v . . .I tb I UH
,, \
,r~
".
PLATEN COVER, ROLLER, DRIVEN PLATEN GEAR
r
-
Pinion Gear MOTOR ASSY.,PF
Figure 2-4. Push Tractor Paper Advance Mechanism
2-4
Rev.A
LX-300 Sarvica Manual
Operating Ptincipla
Pull Tractor Method
The pull tractor advances paper in basically the same way as the push tractor. When the push tractor is installed at the paper exit instead of paper entrance, the tractor functions as a pull tractor instead of a push tractor, pulling the paper out of the printer mechanism. Figure 2-5 shows the pull tractor advance mechanism.
Continuous Paper
,
-.
R PL
.,PF
Figure 2-5. Pull Tractor Paper Advance Mechanism
Rev.A
2-s
Operatjng Prjncjples Push - Pull Tractor Method
U400 Smdce Manual
The push-pull tractor method is a combination of the push method, using the standard tractor, and , ~' " the pull method, using an optional tractor. The two traders operate simultaneously to push and pull the paper through the printer mechanism. Figure 2-6 shows push-pull tiadoroperation when the paper is fed through the rear paper entrance.
~.i , ..
Figure 2-6. Push-Pull Tractor Paper Advance Mechanism Disengage Lever
The disengage lever switches whether or not the printer transmits the torque of the PF motor assembly to the tractor transmission gear. (See Figures 2-5 and 245.) The paper path is different from friction feed and tractor feed. The PF driven roller is not in the tractor feed paper path, so continuous paper is not advanced by this roller. F@me 2-7 shows the paper path.
SHEET GUIDE
PLATEN Continuous paper QY ;&TRAcTOR
-> Cut Sheet
/ ROLLER, PF, DRIVEN
` DETECTOR ASSY., PE
Figure 2-7. Paper Path
,.
24
Rev.A
LX~lW Service Manual
Operating Principb
2.1.4 Ribbon Advance Mechanism
The ribbon is held between the ribbon advance roller (ribbon driven gear) and the ribbon pressure roller. When the carriage moves on the CR guide shaft from left to right and vice versa, the timing belt turns the belt driven pulley. Then the torque is transmitted to the ribbon driving gear through the gear trains. The ribbon driving gear rotates counterclockwise no matter what direction the carriage moves, because a planetary gear is used in the gear linkage.
Table 2-3. Ribbon Advance Gear Linkage
1
Direction of Carriage Movement
Left to right (indicated by the black arrow) Right to light indicated by the white arrow)
Gear Linkage I
Belt driven pulley + Gear(1)+ Gear (2)+ Ribbon driving gear Belt driven pulley + Gear(1) -+ Gear (3)+ Gear (4) + Ribbon driving gear
The ribbon brake sprina attached to the exit of the cartridge case, prevents slack in the ribbon and keeps the ribbon tension at an appropriate level. The ribbon mask prevents the ribbon from brushing against the paper.
Ribbo Ribbon
Spring
Figure 2-8. Ribbon Advance Gear Linkage
Rev.A
2-7
Operating Principles
LX-300 Service Manual
2.1.5 Ribbon Shift Mechanism
This printer can be equipped with a color upgrade kit to print in color. The printer performs color printing unidirectionally. The option is composed of the color ribbon shift mechanism. The Color ribbon feed mechanism is shared in common with black ribbon feed mechanism, and the shift mechanism shifts the ribbon cartridge up and down. Table 2-2 shows the CS motor assembly specifications. The motor control system is open-loop, so that when the color is being changed, the positioning is controlled by stepping pulse.
Table 2-4. CS Motor Assembly Specifications
Category Type Drive Voltage Coil Resistance Drive Pulse Frequency Excitation Method Requirement 4-phase, 48-pole, PM-type stepping motor 35 VDC * 10Yo 150 ohms f 5Y0 (per phase, at 25° C or 77° F) Color shift 500 pps Constant-vottage 2-2 phase excitation
The ribbon shift mechanism consists of the color ribbon and color upgrade kit. The color upgrade kit is composed of the CS motor assembly, ribbcm shift gear/cam, motor driver IC, and color ribbon sensor. The l-inch-wide color ribbon is separated into four equal-width bands of different colors. The ribbon shift mechanism shifts the ribbon cartridge up and down. When the color ribbon cartridge is loaded, it is possible to print in up to seven colors. One of the four colors on the ribbon is selected by the color ribbon cartridge motion, which inserts a portion of the plastic posts into the slots in the printer mechanism as a fulcrum. Figure 2-9 illustrates the color shift mechanism. The mechanism shifts the ribbon cartridge by converting the gear rotation to liner motion (up and down) of the color ribbon cartridge, using color shift cam gear. Any color band can be selected by' rotation of the CS motor assembly, using the color home position (the position of the black color band) as a starting point and reference position. Home position is recognized by the CS motor assembly stepping pulse. When printer is power on, the CS motor assembly is exated at any phase position at first. Next, the CS motor assembly is turned for 235 steps ( black + yellow). Then, the motor returns one step (yellow+ black), and the `motor is stopped. Finally, the motor returns 223 steps (yellow+ black) and stops. This position is home position. Table 2-5 gives coloring sequences. For halftones, as shown in the table, a color is created by printing one color on top of another.
Table 2-5. Coloring Sequences
Print Ribbon Print Color First Printing Black Magenta Cyan Yellow Green Orange Violet Note: Black Magenta cyan Yellow Yellow Yellow Magenta Seoond Printing -- -- -- --
f-'"" ,.
cyan
Magenta Cyan
The printer prints the brighter color first to prevent the ribbon from bt ng stained
2-8
Rev.A
LX-300 Service Manual
Operating Pdncipb
Color Ribbon Cartridge Fulcrum 1/ LEVER,CS
----
-
HOLDER, CARTRIDGE,COLOR Pinion of MOTOR ASSY.,CS Color Shift Cam Color Shift Cam Follower
Figure 2-9. Color Shift Mechanism 2.1.6 Platen Gap Adjustment Mechanism
`The platen gap (the gap between the platen and the printhead) can be adjusted to allow the printer to use paper of different weights or thicknesses. When the gap adjust lever is moved forward or backward, the CR guide shaft rotates. This rotation moves the carriage either toward or away from the platen and changes the platen gap. The correct platen gap is 0.45 tO.02 mm with the gap adjust lever set to position O.
LEVER,G,ADJUST Motion
PG
, TL ,
I I
1 \
,
i'1 .*pfinthead i$- "> printhad Motion"
a . . -- .
,LEVER'GJADJUST
F "-""l 5
."
Platen
"
\
SHAFT,CR,GUIDE
Figure 2-10. Platen Gap Adjustment Mechanism
Rev.A
2-9
Operating Principles
LXXX) Service Mimual
2.2 POWER SUPPLY OPERATION
The printer can be
powered by either of two power supply boards: the C130 F'SB (120V) board assembly or the C130 PSE (230V) power supply. The function of these two boards is the same, except for a difference in primary circuitry. The power supply board outputs the DC current necessary to drive the printer control circuits and drive mechanism. Table 2-6 shows the input voltages and fuse ratings for these boards.
( ( "+
Table 2-6. Power Supply Board
Board
C130 PSB
Input Voltage
100.5-132 VAC
Fuse F1 Rating 2.5A 1125V, 250V 1.25A 1250V
C130 PSE
198-284 VAC
2.2.1 Power Supply Overview
The power supply board has two power outputs for use in the various control arcuits and drive mechanisms. Table 2-7 lists the circuitry and the units that are driven by the two DC output supply voltages.
Table 2-7. Power Supply Output Voltages and Applications
`I%$:i'ul'
+35 v (VP)
Applications CR motor drivers
PF motor drivers
Printhead drivers I CS rnotordrivers I Main board assetivkxic arcuitw Various sensors Control panel LED PF motor/ CS motor hold
+9 V (VL)
,, . .,. ..
.
2-10
Rev.A
LX300 Sarvica Manual
Operating Principk
2.2.2 Power Supply Circuit Operation
Figure 2-11 shows a block diagram of the power supply circuitry. When AC power is supplied to the printer from an external power source, a filter circuit removes the noise. l%e AC voltage then undergoes full-wave rectification and is smoothed to produce the direct current supply voltage. This voltage is fed through a switching circuit and secondary smoothing circuit to produce the stepped down +35 VDC supply. A +35V line voltage detector (ZD51 and PCl) circuit is connected to the switching arcuit. This feedback control arrangement ensures that the +35 VDC supply is kept stabilized. A +9 VDC supply is created by putting the +35 VDC line through the +9 VDC power supply circuit. This arcuit further steps down the +35 VDC voltage and outputs a stabilized supply. The +9 VDC output is stabilized to +5 VDC using the regulator on the C130 MAIN board assembly. There are several arcuits to protect the supply arcuits and avoid danger. The +9 VDC line contains a voltage overload protection circuit. The +9V voltage overload protection circuit (ZD53, Q82, and PC1) cuts the supply if the voltage reaches or exceeds +11 VDC. It stops switching circuit operation, which stops the output from the +35 VDC line. `he +35 VDC line has a voltage overload protectkm circuit. l'he +35 VDC voltage overload protection circuit ( ZD52, Q82, and PC1 ) cuts the supply if the voltage reaches or exceeds +36 VDC. It stops switching circuit operation, which stops the output from the +35 VDC line.
Full-Wave Rectification -- Circuit
Smoothing Circuit
Switching Circuit
Smoothing CirciM D Pflot& Couplef +9VDC +
o +35 VDC (VP)
Filter Circuit
Sfabilizatial + + +9VDC (VL) circuit )
A +3SVDC line (-- ~
AC Line +9 VDC line d -- over-voltage FMecthn Circuit +35 VDC line OWr-volfaga Protection Cinxit
--
figure 2-11. Power Supply Circuit Block Diagram
Rev.A
2-11
Operating Principles
LX-300 Service Manual
2.3 CONTROL CIRCUIT
The control circuit consists of the C130 MAIN board assembly. This -on describes the major components and explains how the board works. 2.3.1 Control Circuit Operation Overview The printer's system IC contains a CPU (pPD78C10A-type) that mm at 14.74 MHz, a gate array (E05A79-type) and a main RAM ( 8KB SRAM). It oversees control of all the components in the printer. The printer uses the E05A90 gate array to control address decodins parallel communidion.s, PF motor drive signals, etc. Table 2-5 shows functions of main IC and arcuits. Figure 2-18 shows the control circuits in block diagram form. ( :"
Table 2-8. Functions of the Main IC
Ic
Location
Function CPU Block: Receives data from the host computer and sends it to the input buffer in RAM (under interrupt processing control). Extends the input data held in the buffer to create image data. Loads this image data to the image buffer in RAM. Transfers the image data to the printhead drive circuit. Also controls various parts of the printer mechanism, such as PF motor control and color select motor control Gate Array Block: Controls the functions below. w Address decoding . Parallel communications q Impact head drive control . CR motor control Main RAM Block: Holds the CPU worldng area and various buffers. Contains the program that runs the CPU and holds the character design (also called the character generator). Hardware reset function An electrically writable and erasable ROM used to hold such information as the TOF posit-km and bidirectional adjustment value. Driver / receiver
SYSTEM IC
ICI
(~..-. "/
ROM RESET IC EEPROM Serial l/F IC
El A2 A3 IC2
r.,. , , RESET IC (AZ) PROM (El)
1+ SYSTEM IC
*
_&m
4
RELEASE LEVER SENSOR Ai ~: ::
(lCl)
.~w .h#Jwfax4usY#J .mww
:. . .(OPTION). . !. .............
+5V OC(VL)
Figure 2-12. Control Circuit Block Diagram
2-12
Rev.A
LX-300 Sarvice Manual
Oparating Principk
2.3.2 Power On Reset Circuit When the power supply is turned on, the VL goes up to +9 VDC immediately, but reset IC output
(IC A2,-. 6) is delayed for approximately 80- 1 ma before going up to +9 VDC. The system IC Pin receives this Lowlevel signal `~om the res& IC and resets itself.
VL
+5V t
?
3ESFT
IC
SYSTEM IC
(ICI)
R37 * \:2)
R38 4
4
v(-.~ ~
&
GND OUT 6
` 3 RESET
T
C24
Figure 2-13. Power On Reset Circuit Diagram 2.3.3 Home Position Sensor Circuit
This printer has a connector switch to sense the carriage home position. The system IC receives a signal (HIGH or LOW) from the HP sensor and remgnize the carriage home position when the printer is turned on. The comector switch is closed (LOW) when the carriage is in the home position and is open (HIGH) when the carnage is out of home position.
+5V SYSTEM IC
(ICI)
R73 SCK 34 R71
I
HP Sensor
Figure 2-14. Home Position Sensor Circuit Diagram
Rev.A
2-13
Operating Principles
LX-300 Service Mhnual
2.3.4 Paper End Sensor Circuit
This printer has a comector switch for sensing the paper end. me system IC receives a signal (HIGH or LOW) from the connector switch and recognizs a paper end. The comector switch is closed (LOW) when there is no paper on the platen and is open (HIGH) when paper is present. +5V .<.;~!$ # , ;;:
SYSTEM IC
(ICI) 4
R74
t
+
PE Sensor
R72
PB2
J'
Figure 2-15. Paper End Sensor Circuit Diagram 2.3.5 Release Lever Position Sensor Circuit
This printer has a comector switch to detect the type of paper handling. The system IC receives a HIGH or LOW signal from th