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L Q - 2 5 5 0
TECHNICAL MANUAL
EPSON
REV.-A
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 a DANGER headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE. 2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH 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 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.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE. 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 KP CHIPS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS. 5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE ICS OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
- ii -
REV.-A
PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the LQ-2550. The instructions and procedures included herein are intended for the experienced repair technician, and attention should be given to the precautions on the preceding page. The chapters are organized as follows: Chapter 1 Provides a general product overview, lists specifications, and illustrates the main components of the printer. Chapter 2 Chapter 3 Chapter 4 Describes the theory of printer operation. Discusses the options Includes a step-by-step guide for product disassembly, assembly, and adjustment. Chapter 5 Chapter 6 Provides Epson-approved techniques for troubleshooting. Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
" The contents of this manual are subject to change without notice.
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REV.-A
REVISION TABLE
REVISION A DATE ISSUED March 31, 1988 CHANGE DOCUMENT
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1st issue
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REV.-A
TABLE OF CONTENTS
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6. APPENDIX GENERAL DESCRIPTION OPERATING PRINCIPLES OPTIONAL EQUIPMENTS DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT TROUBLESHOOTING MAINTENANCE
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REV.-A
CHAPTER 1 GENERAL DESCRIPTION
1.1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 .. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.1 Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 1.2.2 Firmware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1o
1.2
1.3
INTERFACE OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-14 .. 1.3.1 8-bit Parallel Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-14 1.3.2 RS-232C Serial Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
1.4 1.5 1.6
SELF-TEST OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 HEXADECIMAL DUMP FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 PRINTER INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 .. 1.6.1 Hardware Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 1.6.2 Software Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22 .. 1.6.3 Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22
1.7
ERROR CONDITIONS AND BUZZER OPERATION . . . . . . . . . . . . . . . . . . 1-23 1.7.1 Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23 1.7.2 Buzzer Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-23 .
1.8
MAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .1-24
1.8.1 Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .1-25 .
. 1.8.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-25 1.8.1.2 Paper Handling and Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
1.8.2 ROMA Board (Main Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.27 1.8.3 ROPS/ROPSE Board
(Power Supply Circuit Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
1.8.4 Fan Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... . . . . . . . . . . . . . . . . 1-29 1.8.5 Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-29 .. 1.8.6 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30 ..
1.8.6.1 Hardware Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-30 1.8.6.2 SeiecType Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 1-32
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REV.-A
LIST OF FIGURES
Figure 1-1. Figure 1-2. Figure 1-3. Exterior Views of the LQ-2550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 Printhead Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 Cut Sheet Paper Printable Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Figure 1-4. Fanfold Paper Printable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 Figure 1-5. Figure 1-6. Figure 1-7. . Label Printable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 . Character Matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12 Data .Transmission Timing for the 8-bit Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-14 Figure 1-8. Figure 1-9. 36-pin 57-30360 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14 Handshaking for RS-232C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Figure 1-10. Serial Data Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 Figure 1-11. Serial Interface Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18 . Figure 1-12. Self-Test Printing (LQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 . Figure 1-13. Hexadecimal Dump List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 Figure 1-14. LQ-2550 Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-24 Figure 1-15. Model-5560 Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25 . Figure 1-16. ROMA Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-27 . Figure 1-17. ROPS/ROPSE Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28 .. Figure 1-18. Fan Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29 .. Figure 1-19. Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29 . Figure 1-20. Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-30 Figure 1-21. SelecType Operational Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
LIST OF TABLES
Table 1-1. Table 1-2. Table 1-3. Table 14. Table 1-5. Table 1-6. Table 1-7. Table 1-8. Table 1-9. Table 1-10. . Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 Optional Interface Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 Line Feed Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 . Cut Sheet Paper Specified Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Fanfold Paper Specified Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 Ribbon Cartridge Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9 Printing Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11 .
--
REV.-A Table 1-11. Character Matrix and Character Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 Table 1-12. 8-bit Parallel l/F Connector . Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 Table 1-13. Select/Deselect Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-16 Table 1-14. Serial Interface Handshaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 Table 1-15. RS-232C Serial Interface Connector . Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19 . Table 1-16. Self-Test Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 Table 1-17. Hexadecimal Dump Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21
l-iii
REV.-A ` 1.1
FEATURES The LQ-2550 printer is
a multifunction, 24-pin, impact dot-matrix printer. The main features Of this
printer are: q IESC/P Expanded is implemented as a standard q IUpward compatibility with the LQ-2500/LQ-2500+ q A maximum print speed of 400 CPS in draft mode at 12 CPI and 133 CPS in LQ mode at 12 CPI q IDirect selection of font, pitch, and normal/condensed mode, and SelecType function with LCD (Liquid Crystal Display) which makes panel settings easier q Multiple standard fonts (Roman, Saris Serif, Courier, Prestige, Script, OCR-A, and OCR-B) q Advanced paper handling: Automatic release function Automatic platen gap adjustment function Micro adjustment function Tear-off function Automatic paper-loading/ejectin9 q Color printing capability function
q Low-noise acoustics q Both 8-bit parallel and RS-232C serial interfaces q Push and (optional) pull tractor feeding , q Printing of fanfold paper without removal of the cut sheet feeder (option) q Optional interface for the EPSON 8100 series q Optional low-priced, double-bin cut sheet feeder with envelope feeding capability Figure 1-1 shows exterior views of the printer, Table 1-1 lists optional units that are available, and Table 1-2 lists the optional interface boards (refer to Chapter 3 for more detailed information) for the LQ-2550.
Setting for Continuous Paper
Setting for Cut Sheet Paper
Figure 1-1. Exterior Views of the LQ-2550
1-1
Table 1-1. Optional Units No. #73 14 #7343 #7394 #7762 #7763 #7764 Name Pull tractor unit Double bin cut sheet feeder Scanner option kit Ribbon cartridge (black) Ribbon cattridge (color) Ribbon cartridge (film-black)
Table 1-2. Optional Interface Boards No. #8143 #8145 #8 148 #8 149 Name New serial interface RS-232C current loop interface type II Intelligent serial interface Intelligent serial interface type II
. {:'",
#8 149M
#8 161 #81 65 #8 172 #8 172M
I I I I
Intelligent serial interface type Ill IEEE-488 interface Intelligent IEEE-488 interface 32 K-byte buffer parallel interface 128K-byte buffer parallel interface I
g:;;
.7, ...,
1-2
REV.-A \
1.2 SPECIFICATIONS
The LQ-2550 communicates with a wide variety of host computers, with the aid of the optional Identity Modules. However, this section describes the specifications for the printer without the Identity Module. Specifications not affected by firmware (hardware specifications) are the same whether or not the Identity Module is installed.
1.2.1 Hardware Specifications Printing Method
Pin Configuration Serial, impact dot matrix See Figure 1-2 (1 2x2 staggered, diameter: 0.2 mm). ..=
$
5
7
='
2 4 \
0 OJ
$'-
1'
11
13 15 17
21 23
4
1160"
I
6 8
10 12 14 16 la
20 22
24
Figure 1-2. Printhead Pin Configuration
1-3
REV.-A Feeding Method Friction feed Tractor feed (push: standard, push-pull: optional) NOTES: 1. When using friction feed: q Select friction feed on the control panel. q Do not use continuous (fanfold) paper. q Do not use a single sheet paper shorter than 92mm or longer than 364mm q Do not perform any reverse paper feed operations within the top 8.5 mm and bottom 22 mm of the paper. q Do not perform reverse feed beyond 1/6" after the paper end has been detected. q Do not use multi-part, single-sheet forms. 2. When using push-pull tractor feed: q Select tractor feed on the control panel. q Mount the pull tractor unit (optional). q Do not loosen the paper between the platen and the pull sprocket. q Precisely align the horizontal position of the pull sprocket and push tractor. q Do not perform reverse feeding for more than 1/6". q Do not perform reverse feeding after the paper end has been detected. q Multiple copy paper must be pasted together using line or dots. q Copy paper must be carbonless multi-part paper. Paper Loading Directions Fanfold paper Cut sheet paper Line Spacing Line Feed Speed Inserted from the rear Inserted from the top 1/6", 1/8", or programmable in units of 1/1 80" orl/360" See Table 1-3. Table 1-3. Line Feed Speeds 1/6" line spacing [ins/line] Continuous [inch/s]
Feeding Method Friction without CSF Friction with CSF Tractor =
84
4.0
1-4
REV.-A
\ Paper Specifications Cut sheet paper Refer to Table 1-4 and Figure 1-3. Table 1-4. Cut Sheet Paper Specified Conditions Width Length [mm]
I I
182 -364 (7.2 - 14.3")
[mm] I 364 (14.3") max. 0.065-0.10 (0.0025 - 0.004")
Thickness [mm] Weight Quality
Copies
[ l b ] I 14-22 ( 5 2 - 8 2 g/m2) I Plain paper
I Not available
7.2-14.3",
182 '364 mm Printable area
I
t
0.1 2", 3 mm. or more 1-0.1 2", 3 mm
1
or more
r mol
v r i n t t
.33", 6.5 mm
T
ABC
T
XYZ
MAX. . . 3; 364mm I e a r e a
0.52",
1
L
ABC
3mm
J
XYZ
NOTES: 1. Printing is possible approx. 8.5mm (0.33") from the top of the paper. But the paper feed
accuracy can not be assured in the area approx. 22mm (0.87") from the top of the paper.
2. Printing is possible approximately 45.9mm past the point where end-of-page has been
detected. Thus, the value 13.3mm (0.52") (lowest print position) is given for reference only. Paper feed accuracy cannot be assured in the area approximately 22mm(0.87") from the bottom of the page. Figure 1-3. Cut Sheet Paper Printable Area
1-5
REV.-A
Fanfold paper
Refer to Table 1-5 and Figure 1-4.
."3 f. . . . .,,. ~
Table 1-5. Fanfold Paper Specified Conditions
Width [mm]
101 -406 (4.0 - 16.0") 6 (1 original + 5 ) over the entire temperature range Plain paper 0.06-0.46 (0.0023 -0.0 18") 1 sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2 2 ( 4 0 - 8 2 g/m2) 6 sheets ...................12 - 1 5 ( 4 0 - 58.2 g/m2) each sheet
Copies Quality
[sheets]
Total Thickness [mm] Weight IIbs]
M * ~
4-16" ,
101 -4C)6mm Printable area I * 0 0 0 0 0
0
d
{ ; .., ,.
o
Printable area
0 0 0 0 0 0
0 0 or more 0- - - - - - - - - - - - - - - - - - - - - - - - - - - 04 o 0 0.35", 9 mm 0 0 or more 0
i 0.35", 9 mm
o
o
L
ABC
XYZ d :
0
o ABC i Printable
o 0'
T
XYZ : T 0
o
0
0
0
area
0
0 0
0 0 0 0
*: 101 - 381 mm (4 - 15") wide paper . . . . . . . . . . . . . . . . . . . . . 13mm or more, 406 mm ( 16") wide paper . . . . . . . . . . . . . . . . . . . . . 26mm or more Figure 1-4. Fanfold Paper Printable Area
1-6
REV.-A .. Envelopes Size Quality Thickness No. 6 165 x 92 mm (6.5 x 3.63") No. 10241 x 105mm (9.5 x 4. 13") Bond paper, xerographic copier paper, airmail paper 0.16-0.52 mm (0.0063 -0.01 97")
NOTE: Differences in thickness within printing area must be less than 0.25 mm (0.0098"). Weight 1 2 - 24 lb (45 - 9 1 g/m2)
NOTES: 1. Envelope printing is only available at normal temperature. 2. Keep the longer side of the envelope horizontal. Labels Size Thickness \ 2. 1/2
X 15/1
6", 4
X 15/1
6", 4
X 1"7/16"
O.19 mm (0.0075") max.
NOTE: Thickness excluding the base paper must be less than or equal to 0.12 mm (0.0047"). NOTES: 1. Printing of labels is only possible at normal temperature. 2. Labels must be fanfold. 3. Labels with pressure-sensitive paper must be joined by dot or line pasting, and the total thickness must be less than or equal to 0.3 mm (0.01 1 8") and should be printed under conditions between 5 to 35 `C and 20 to 80% RH. 4. Examples of labels: AVERY CONTINUOUS FORM LABELS AVERY MINI-LINE LABELS Printable area See Figure 1-5.
k
2 }
101.6 mm [ 4" ) 63.5mm ( " 2 " )
A
<
23. Emm
('5+6")
J r_ 36.5mm (176")
Figure 1-5. Label Printable Area
1-7
REV.-A
Ribbon Cartridge See Table 1-6. Table 1-6. Ribbon Cartridge Specification
I [
Ribbon Model No. Type Color
#7762 Normal Black
#7764 Film
#7763 Multi-color Black, Cyan, Magenta, and yellow Black: 1 0.7
L
i
f
e 3
[million/characters]*'
0.2
Cyan:
Magenta: 0.7 Yellow: 0.5
xl: LQ-selftest Dimensions Weight See Table 1-7 (Details are shown in Figure A-59.) See Table 1-7. Table 1-7. Dimensions and Weight Width [mm] 676 Height [mm] 198 Depth [mm] 535 Weight [Kg] 20 (approx.)
c
.. .4`
NOTE: Including the paper feed knob and paper guide. Electrical Specifications See Table 1-8. Table 1-8. Electrical Specifications
1 0 0 -
120 V Version
I
220-240 V Version 198-264 , ., f-..+,
f Voltage ~ AC] Frequency Range [Hz] Rating Current "' [A] Insulation Resistance [M ohm] min. (between AC line and chassis) I
Dielectric Strength ~ AC, rms] (1 minute, between AC line and chassis) *1: At draft-selftest printing. 1250
108- 132 49.5 - 6 0 . 5 1.6
1.0
10 I
3750
1-8
REV.-A Environmental Conditions Refer to Table 1-9. Table 1-9. Environmental Conditions Storage Temperature ["C] 30 - 65*
1
Operating 5 - 3 5 10-80 1 I
I
Humidity [% RH] Resistance to shock [G] 1 (within 1 ms) Resistance to Vibration [G] (55 Hz, max.)
5 - 8 5 2
I
0.50
0.25
x: With shipment container `. Reliability MCBF MTBF Printhead life Safety Approvals Safety standards 5 million lines (excluding printhead) (MCBF . . . Mean Cycles Between Failure) 6000 POH (duty 25%) (POH . . . Power On Hour) 200 million strokes/wire
UL478 (U.S.A. version) CSA22.2#154 VDE0806 (TUV) (European version)
Radio frequency Interface (RFI)
FCC class B (U.S.A. version) VDE0871 (self-certification) (European version)
1-9
REV.-A
1.2.2 Firmware Specifications Control Code Printing Direction
Input Data Buffer Character Code Character Set Family
ESC/P-83 Expanded Bidirectional logic seeking
8K-bytes 8 bits 96 ASCII and 13 international character sets No. O Roman: SansSerif: No. 1 No. 2 Courier: Prestige: Script: OCR-B: OCR-A: No. 3 No. 4 No. 5 No. 6 10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, Proportional 10, 12 Proportional 10, 12, 15
-+ f',: -
Font and Character Spacing Roman: SansSerif: Courier: Prestige: Script: OCR-B: OCR-A: Draft: Printing Mode
Printing quality (Draft/LQ) Character pitch (10, 12, 15 CPI or Propotiional) Condensed Double-width Double-height Emphasized Double-strike Italic Underlined Outline Shadow
NOTE: A condensed mode for 15 CPI characters is not available. Print Speed Refer to Table 1-10.
1-10
REV.-A
Table 1-10. Printing Mode
Print Pitch
10
Condensed Emphasized
0 0
Double Width
0
Character Pitch ICPI]
10
Printing Speed [CPS]
Draft 333 167 LQ 111 55 111 55 189 94 133 67 133 67 221 111 167 83 167 83 Ignored
Printable Columns 136 68 136 68 233 116 163 81 163 81 272 136 204 204 102 102
1 1 0 1 1 x o 1 12 0 0 0 1 1 0 1
5
10
5 17.1 8.5 12 6 12 6 20 10 15 15 7.5 7.5
167
83 285 142 400 200 200 100 333 167 500 250 250 124
.,,
15
1
x
o 1
0
0
0 1
1
0 1
1 `proportional o
x x
x o 8.6 20 1 4.3 10 --
94 221 50 111 189 444
Max. 116 Min. 272 Max. 58 Min. 136 Max. 233 Min. 544 Max. 116 Min. 272 Max. 174 Min. 408 Max. 87 Min. 204 Max. 174 Min. Max. Min. 816 87 ;
1
x
o
17.1 40
1
8.6 20
--
94 221
\
`proportional Superl' subscript
o
x
o
12.8 30
--
142 333
1
6.4 15
--
71 167
1
x
o
25.7 60
--
285 667 142 333
1
12.8 30
~ 4 204
NOTES: 1. Max. means the value when the maximum width characters are printed.
2. Min. means the value when the minimum width characters are printed.
3. "--" means that LQ character set is automatically selected when proportional pitch is
specified.
\
1-11
REV.-A character Matrix See Figure 1-6.
,1 ,
...
f: --,
(Superscript Character) Pin Nos. 17 to 24 are not used for superscript
(Normal Character)
printing.
:
3 4 5 6 7 : 10
II 12
Ascender Area
--
R Ascender Area (15pi!Ch) , 1 L
i).
;
3 4 5 6 7 8 9
r ;
R k
H T s P A c E
A H T s P
A c
T s
P A c E
13
14
15 16 17 18 19 20 21 22 23 24
E (a 2
10 II
12 I? 14
. .. L
Descender Area
--
Face Wid!h(al) Character Width (CW)
4
(Subscript Character) Pin Nos. 1 to 8 are not used for subscript printing.
--
9 10 L II E 12 F 13 T 14 15 s
R A
H T s P A c E
16 P 17 A 18 c E ;: 21 22 23
24
r'; ..
--
--
Figure 1-6. Character Matrix
1-12
REV.-A
Character Size
See Table 1-11. Table 1-11. Character Matrix and Character Size
Printing Mode DRAFT, 10 pitch DRAFT, 12 pitch DRAFT, 15 pitch DRAFT, 10 pitch, condensed DRAFT, 12 pitch, condensed LQ, 10 pitch LQ, 12 pitch LQ, 15 pitch LQ, 10 pitch, condensed LQ, 12 pitch, condensed LQ, proportional
I
I
Face Matrix 9 9 9
X X X
I
1
HDD 120 120 120
I
I `1
Character Size H. x V. [mm] 1.9 1.9 1.0 . .
X X X
I
] I
Unit ESC SP 120 120 120 240 240
23 23 16
3.2 3.2 2.3
I
29 29 15 I
...
...
X X X
I
23 23 16 I
240 240 360 360 360 360 360 360 360 360 360 360 360 360 360
. ...
2.0 2.0 1.0 I . .
X X X
3.2 3.2 2.3 I
180 180
180 360 360
... ... Max. 39 x 23 Min. 18 x 23
. ...
2.6 1.0
X X
3.2 180 3.2 360
LQ, proportional, condensed
... ...
... ... 1.8 0.7
X X
LQ, proportional, super/subscript
Max. 28 x 16 Min. 12 x 16
2.3 180 2.3 360
LQ proportional, super/subscript, condensed
... ...
... ..
NOTES: 1. "HDD" means the Horizontal dot density, and the units are dots per inch. 2. "Face matrix" and "character size" indicate the maximum size of characters and this vail
will change with condition of paper. 3. "Unit ESC sp" indicates the minimum length which is added to the right of the character that can be specified with ESC sp control code. 4. "..." indicates that the character matrix is reformed by printer firmware. Character width becomes half of a non-condensed character.
1-13
REV.-A
1.3 INTERFACE OVERVIEW
The LQ-2550 has both an 8-bit Parallel interface and an RS-232C serial interface as standard. The interface can be selected from the control Panel (For details of the control Panel settings, refer to Section 1.8.6.2.).
1.3.1 8-bit Parallel Interface Specifications
Data Transmission Mode Synchronization Handshaking Logic Level Data Transmission Timing Connector Connector Pin Assignment Select/Deselect (DC1/DC3) Control
8-bit parallel By STROBE pulse By BUSY and ACKNLG (either or both)
ITL (LS) compatible See Figure 1-7. 57-30360 (AMPHENOL) or equivalent (See Figure 1-8.) Refer to Table 1-12. Refer to Table 1-13.
BUSY ACKNLG DATA STROBE
NOTE: Transmission time (rising and falling time) of every input signal must be less than 0.2 #s. Figure 1-7. Data Transmission Timing for the 8-bit Parallel Interface
1. 2. 3. 4. 5. 6, ?. e. 9. 10 II 12 13 14 J5 16 17 19
19. GNO ( Pa., ..,ml. ) 20. GNO (Pm.. w,tn2.) 21. GNO IPa, c w.tn3.) 22. GNO ( Pair .,,"4.) 2 3 . CJNO [Pa., w:tm5.1 28, GNO (Pa;, w:,n6.) 2 5 . GNO ( Pa,. w,,n?.] 2 6 . GNO ( Per w:m8.) 2'7. GNO ( Pm,, .,,.9.) 2 8 . GNO (P,., .,,.10,1 29, GNO ( Par -,. I l.) 3 0 . GNO (Pa.< .,,-12.1 31. Fit 32, ERRGR 33, GNO 34. NC 3 s . .5V -- . 36. SLCTIN
Figure 1-8. 36-Pin 57-30360 Connector 1-14
\
Pin No.1 Signal STROBE
Table 1-12. 8-bit Parallel l/F Connector Pin Assignments
Return 19 I 1/0 I I Description Strobe pulse to read the input data. Pulse width must be more than 0.5 KS. Input data is latched after falling edge of this signal. Parallel input data to the printer. "HIGH" level means data "l". "LOW'" level means data "O".
1
2 3 4 5 6 7 8 9 10 11 12 13 14
DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 DATA8 ACKNLG BUSY PE
20 21 22 23 24 25 26 27 28 29 30 -- --
I I I I I I I I 0 0 0
This pulse indicates data are received and the printer is ready to accept next data. Pulse width is approx. 11 IJS. "HIGH" indicates printer can not accept data. "HIGH" indicates paper-out. This signal is effective only when ERROR signal is "LOW". Always "HIGH". (Pulled up to +5V through 3.3 K ohms resistor.) If this signal is "LOW" when the printer is initialized, a line feed is automatically performed by input of "CR" code (Auto LF). Not used. Ground for twisted-pair. Printer chassis ground. Not used. Ground for twisted-pair. Pulse (width: 50 WS min., active "LOW") input for printer initialization. "LOW" indicates that some error has occurred in the printer. Ground for twisted-pair. Not used. Always "HIGH". (Pulled up to +5V through 3.3 K ohms resistor.) If the signal is "LOW" when printer is initialized, the DC l/DC3 control is disabled.
SLCT AUTOFEED-XT
o
I
15 16 17 18
19 to 30 . 31
NC GND Chassis GND NC GND INIT ERROR GND NC + 5V SLECT-IN
-- -- -- -- -- 16 -- -- -- -- --
-- -- -- -- -- I
. 32
o
-- -- o I
33 .
. 34 .
35 .
# < 36
NOTES: 1. "Direction" of signal flow is as viewed from the printer. 2. "Return" denotes "TWISTED PAIR RETURN" and is to be connected at signal ground level.
As to the wiring for the interface, be sure to use a twisted-pair cable for each signal and
never fail to connect the return side. To prevent noise, cables should be shielded and connected to the chassis of the host computer and the printer.
1-15
REV.-A Table 1-13. Select/Deselect Control
ON-LINE Sw OFF-LINE
ON-LINE
> ('.
DATA ENTRY
Disable Enable (Normal Process) Enable (Waits DC 1. See Note 2) Enable (Normal Process)
SLCT-IN HIGH/LOW
HIGH
Dcl/Dc3 DC l/DC3
DC 1
ERROR
LOW
HIGH
BUSY
HIGH
LOW/HIGH (During data entry) L O W / H I G H (Durring data entry) LOW/HIGH (During data entry) L O W / H I G H (Durring data entry)
ACKNLG
No pulse
Pulse output after entry) Pulse output after entry Pulse output after entry Pulse output after entry
DC3 LOW
HIGH
DC1
HIGH
DC3
HIGH
NOTES: 1. In Table 1-13, it is assumed that no ERROR status exists other than that attributable to the OFF-LINE mode. 2. Once the printer is deselected by the DC3 code, the printer will not revert to the selected state until the DC 1 code is input (In the deselected state, input data is ignored until DC 1 is received.). 3. The DC 1 and DC3 codes are enabled only when the SLCT-IN signal (Input Connector Pin No. 36 when the parallel interface unit is used) is HIGH and the printer is initialized. 4, The SLCT4N signal is LOW when the printer is initialized. At this time the DC l/DC3 printer select/deselect control is invalidated, and these control codes are ignored. 5. The SLCT-IN signal is HIGH, and it is not set to LOW by SelecType function when the printer is initialized. The printer will start from the selected (DC 1 ) state. (.;
f
. `"' .
`.
,
1-16
REV.-A
\
1.3.2 RS-232C
Synchronization Handshaking
Serial Interface Specifications
RS-232C serial Asynchronous By DTR (REV) signal or X-ON/OFF protocol
Refer to Table 1-14 and Figure 1-9. Table 1-14. Serial Interface Handshaking
Data Transmission Mode
DTR Signal MARK
X-ON/OFF protocol X-OFF (DC3\l 3H)
Description When the number of bytes remaining in the input buffer reaches 256 or less, the signal level goes to MARK, or an X-OFF code is sent to the host computer. This indicates that the printer is not ready to receive data. When the number of bytes remaining in the input buffer reaches 528 or more, the signal level goes to SPACE, or an X-ON code is sent to the host computer. This indicates that the printer is ready to receive data. -.
SPACE
X-ON (DC 1/1 1 H)
DTR {REV) Signal
MARK ( -
12V)
I
----------------
I I I I I I : t I I
SPASE ( + 12V) L,8Kbyte
I I 1 ``:'`5 1 2 b y t e 256byte O
I 1 I
I I I
byte Input Buffer Vacant Area
X-ON
X-OFF
X-ON/X-OFF Protocol
Figure 1-9. Handshaking for RS-232C Interface Word Length Start bit
Data bits Parity Stop bits
1 8 Odd, Even, or none 1 bit or more 300, 600, 1200, 2400, 4800, 9600, or 19200 BPS
EIA level, MARK: logical 1 (3 - 27 V) SPACE: logical O (+3 - +27 V)
Bit Rate Logic Level
1-17
REV.-A Data Transmission Timing See Figure 1-10.
. . .~ { ... ,' "
[ +V) DTR ( -v)
( +V) RXD [ -v)
------
--------------------- -- -- -- -- -- -- -- -Data Bit
1
---:s!Mik16k .1
s;t&* DTR Handshake
Pcr:;y
J StW 17 POrli/y Bit
--7
stop Blt
1-
( +V)
RXO (
-v]
Blt
" `IIM!l!m D a t a Blt
,,--
Stmf
( +V) TXD ( -v)
"TL \
m
.stu-t Data Blt Blt [X-OFF) X-ONDZ-OFF Protocol
S::t D~t:at:t
NOTES: 1. The value of "T" varies according to the input data. 2. The word structure of serial data is 1 start bit + 8 data bits + parity (Odd, Even, or none) + 1 or more stop bits.
Figure 1-10. Serial Data Transmission Timing
Error Detection
Parity error: "*" is printed. Overrun error: Ignored Framing error: Ignored
Connector
D-SUB 25-pin connector (See Figure 1-1 1.)
Zn . ., -.. ,,,
Connector Pin Assignments Refer to Table 1-15.
f
1. CHA5.51S GND Z.TXO 3.RxD 4.NC 5.NC SAC 7.SIGW GNO e.Nc 9.NC
to.Nc -- t I.REv
IZ.NC IXNC
#
E
34. Nc 45. NC \6. NC !7. Nc 18. NC 19. NC 2D.DTR 2i.NC Z2.NC 2%NC Z4.NC
2SNC
Figure 1-11. Serial Interface Connector .:., . . ., ,'
1-18
\ IPin No. 2 20
Table 1-15. RS-232C Serial Interface Connector Pin Assignments Signal TXD DTR 1/0 o o Transmit data. Indicates when printer is ready to receive data. "MARK" level indicates printer is not ready to receive data. 11 3 7 1 REV(=2nd RTS) RXD SIGNAL GND CHASSIS GND o I -- -- Same as DTR. Receive data. Signal (Logic) ground level. Printer chassis ground. Description
NOTE: "Direction" of signal flow is as viewed from the printer. \
1-19
REV.-A
1.4 SELF-TEST OPERATION
panel are printed when the self-test is executed. When the C-SF mode is enabIed, the current sheet length is printed out at the end of the first page. Table 1-16 lists the self-test operating instructions and Figure 1-12 shows the self-test printing. Table 1-16. Self-Test Operation Type-face Draft Start Turn the power ON while pressing the LINE FEED switch. LQ Turn the power ON while pressing the FORM FEED switch. stop Push the ON LINE switch, and turn the power OFF.
-'% f
The LQ-2550 printer has the following self-test functions. The current and default settings at the control -`"
#...
&
.+'
Current setting FONT Roman PITCH 10CPI CONDENSED off FORM LNG Tractor 66LINE CSF binl 132LINE CSF bin2 132LINE off 1" SKIP AUTO TEAR OFF o f f o LEFT MARGIN RIGHT MARGIN 136 CG TABLE Italic COUNTRY USA PRINT DIR. Bi-d COLOR Black Default setting . . . A{] I IT MACRO
1
c"..., . . I
IRoman ! " #$%&. ` ( )*+, -. /0 I 234 56789: ; < = >?@ABCI)EFcHTJ} ! " #$%&` ( )*+ , -. /01234 56789 : ; < = > ?@ ABCllEFGHI.JKI " #$%&. ` ( )*+ ,-. /0123456789 : ; < = > ?@ ABCDFFGHIJKIIh #$%& ` ( )*+ ,-. /0 123456789 : ; < = > ?@ A13CDEFGHIJKLMb $%&. ` ( )*+ ,-. /0 123456789 : ; < = > ?@i4FWT)J?FGH IJKl,MN( %& ` ( )*+ , -. /0 123456789 : ; < = > ?@! ABCI)EFGHIJKLMNOE & ` ( )*+ , - . /0 1234 56789: ", < = > [email protected]~c:~F.F~H T JK],MNOPG
Figure 1-12. Self-Test Printing (LQ)
.....
1-20
REV.-A
., 1.5 HEXADECIMAL DUMP FUNCTION
In hexadecimal dump mode, the printer prints out the data it receives in hexadecimal format. The printer prints a column of 16 hexadecimal values, followed by a column containing the 16 corresponding ASCII characters. If there is no corresponding printable character for a value (e.g., a control code, such as a carriage return or line feed), a period (.) is printed in the ASCII column in the position of the code. Each line of the dump contains 16 values, printed in the order they were received, and any remaining data (less than 16 values on the final line) can be printed by operating the ON LINE switch. Table 1-17 explains the hexadecimal dump operation and Figure 1-13 shows a sample printout of the operation. Table 1-17. Hexadecimal Dump Operation
I
\
Function
Hexadecimal dump mode
I
Operation Turn the power ON while
pressing both the LINE FEED and FORM FEED switches.
I
stop Turn the power OFF.
I
Data Dump
Mode OA 20 6C 34 20 74 68 20 69 2E 62 4C 20 70 69 20 1.1 FEATURES. . . . T h e LQ-850/1050 printers are mul tifunctlonal, 2 4 -pin p r i n t h e a d , impact dot- . . mat rix p r i n t e r s . T h e main f eatu res o f t h e t h e s e pri nters are: . . . . . U p w a r d compatib ility with t h e L Q-800 /1000... A maximum print sp e e d o f 2 6 4 CPS i n draft mode at
31 2E 31 20 46 45 41 54 55 52 45 53 OD 06 OD 54 68 65 20 4C 51 2D 38 35 30 2F 31 30 35 30 70 72 69 6E 74 65 72 73 20 61 72 65 20 6D 75 74 69 66 75 6E 63 74 69 6F 6E 61 6C 2C 20 32 2D 70 69 6E 20 70 72 69 6E 74 68 65 61 64 2C 69 6D 70 61 63 74 20 64 6F 74 2D OD 06 6D 61 72 69 78 20 70 72 69 6E 74 65 72 73 2E 20 54 65 20 6D 61 69 6E 20 66 65 61 74 75 `72 65 73 6F 66 20 74 68 65 20 74 68 65 73 65 20 70 72 6 E 74 65 72 73 20 61 72 65 3A 20 OD OA OD OA ~ 20 55 70 77 61 72 64 20 63 6 F 6D 70 61 74 69 69 6C 69 74 79 20 77 69 74 68 20 74 68 65 20 51 2D 38 30 30 2F 31 30 30 30 OD OA 2 E 20 41 ,6D 61 78 69 6D 75 6D 20 70 72 69 6E 74 20 73 65 65 64 20 6F 66 20 32 36 34 20 43 50 53 20 ,6E 20 64 72 61 66 74 20 6D 6F 64 65 20 61 74
Fig 1-13. Hexadecimal Dump List
1-21
REV.-A
1.6 PRINTER INITIALIZATION
There are two initialization methods: hardware initialization and software initialization. 1.6.1 Hardware Initialization
This type of initialization occurs when printer power is turned on or when the printer receives the I NIT signal from the host via the 8-bjt Parallel interface. When the winter is initialized in this wwt it Performs the following actions: q Initializes the printer mechanism q Clears the downloaded character set q Clears the input data buffer q Clears the image buffer q Sets printer selections to their default values (Refer to Section 1.6.3.)
1.6.2 Software Initialization
This type of initialization occurs when the printer receives a command (ESC @) via software. When the printer is initialized in this way, it performs the following actions: q Clears the image buffer q Sets printer selections to their default values (Several settings are changed by the last SelecType operation before ESC@ is input (Refer to Section 1.6.3.).
1.6.3 Default Values
The default values set by the default setting mode of the SelecType function are only reset by a hardware initialization. The printer's default values are as follows: Preset paper position becomes top-of-form position Page Position Left and Right Margin Line Spacing Vertical Tab Positions Horizontal Tab Positions VFU Channel Downloaded Characters Justification Character Spacing SelecType setting 1/6" Cleared Every 8 characters (relative) Channel O Deselected Left justification No additional spacing ESC Z = ESC X3
Family Number of Type Style SelecType setting
Bit Image Mode Assignment ESC K = ESC *O, ESC L = ESC xl, ESC Y = ESC X2,
. .,,
1-22
REV.-A
` 1.7 ERROR CONDITIONS AND BUZZER OPERATION
This section describes the error conditions and buzzer operation of the printer.
1.7.1 Error Conditions
If any of the following errors occur, the printer automatically enters the OFF LINE mode and outputs the appropriate interface signal. q Carriage and platen gap home positons are not detected at printer mechanism initialization. q The ON LINE switch is pressed, causing the printer to enter OFF-LINE mode. q Paper-out is detected. q A paper-out signal is detected after the printer has perFormed a paper loading operation with the cut sheet feeder enabled. For information concerning the status of the interface signals, refer to Table I-l 2.
1.7.2 Buzzer Operation
.. The buzzer rings as follows: q When a BEL code is sent to the printer, the buzzer sounds for 0.1 seconds. q When an error has occurred, Carriage Trouble: Sounds 5 times (rings for 0.5 seconds with 0.5 second intervals.) Paper End: Sounds 3 times (rings for 0.1 seconds with 0.1 second intervals.) q When a panel setting is accepted, the buzzer sounds for 0.1 seconds.
1-23
REV.-A
1.8 MAIN COMPONENTS
The LQ-2550 printer includes the following major subassemblies: q Model-5560 printer mechanism q ROMA board (main board) q ROPS/ROPSE board (power supply board, 100- 120V and 220- 240V versions) q Fan Unit q Housing
c
ROPNL-W board (control panel) Figure 1-14 shows the LQ-2550 component locations.
Fan Unit \
Printer Mechanism
Figure 1-14. LQ-2550 Component Locations
. r'
1-24
REV.-A
1.8.1 Printer Mechanism
This section describes over view of the printer mechanism, and paper handling and operations. 1.8.1.1 Overview To improve paper handling, the following functions are newly incorporated in this 24-pin printer in addition to the conventional ones. q Automatic release mechanism q Automatic paper thickness detection nechanism q Automatic platen gap adjustment mechanism q Automatic paper width detection mechanism q Automatic loading lever open/close mechanism
Figure 1-15. Model-5560 Printer Mechanism
-
1-25
REV.-A 1.8.1.2 Paper Handling and Operations Paper Loading and Ejection Since the paper release lever is controlled automatically, the pApER SELECT and LOAD/EJECT switches on the control panel provide highly improved paper handling. That is, change over between fanfold (continuous) and single sheet paper and loading/ejecting paper are performed automatically. a) Single Sheet Loading and Ejection To load a sheet of paper, press the PAPER SELECT switch and select FRICTION feed. If fanfold paper
is loaded, the paper is ejected backward (automatic back out). Place the page along the paper guide,
f ":;
and press the LOAD/EJECT switch. This loads the paper at the top-of-form position. If the LOAD/EJECT switch is pressed after paper has been loaded, it causes the paper to be ejected
forward.
b) Fanfold Paper Loading and Ejection (Back Out) Set the fanfold paper into the push-tractor unit. To load fanfold paper, press the PAPER SELECT switch and select TRACTOR feed. If single sheet paper is loaded, the paper is ejected forward and the fanfold paper is loaded. When the TRACTOR feed has already been selected, pressing the LOAD/EJECT switch loads the paper automatically to the top-of-form position. If LOAD\ EJECT switch is pressed after the fanfold paper has been loaded, the printer ejects the paper backward to the push tractor. To back out several pages, press the LOAD\ EJECT switch several times, since reverse feed is performed on a page-by-page basis. Micro Adjustment Function In either case a) or b) above, the top-of-form position is adjustable using the MICRO FEED switch (the message "TOF ADJUST" is displayed on the LCD, and the MICRO FEED, V, and A LEDs are lit.). Pressing the FORM FEED switch advances the paper forward in increments ofl/1 80" continuously as long as the switch is held down, and pressing the LINE FEED switch moves the paper in reverse in increments of 1/180". Moving the paper with these switches is called micro adjustment. The adjusted position is stored in the memory and remains effective at the next loading even if the power is cycled. But the tractor feed is selected, the adjusted position is remained even if the power is turned off. Auto-Tear-Off Function To enable the auto-tear-off function, select AUTO TEAR OFF using the SelecType function. When this function is activated and the PAPER SELECT is FRICTION, paper is fed in the following way: after the input data buffer becomes empty, while the printer is ON-LINE, the printer feeds the paper so that the perforation at the form's end is moved automatically to the tear-off edge of the printer cover. After the printer has positioned the paper, the message "TEAR OFF ADJUST" is displayed on the LCD, and the V, A, and MICRO FEED LEDs are lit. The FORM FEED and LINE FEED switches are then available for micro adjustment of the tear-off position. The adjusted position is stored in the memory and remains effective at the next tear-off even if the power is turned off and on. If subsequent data is input to the printer, the paper will be reversed to its original position automatically and printing will start. If the ON-LINE switch is pressed (taking the printer OFF-LINE) while the paper is advanced to the tear-off position, then the printer will reverse the paper to its original position. The manual tear-off function selected by the TEAR OFF switch is also called a tear-off function. {;,,
,:. , (-'
J.-,
. , -.,,.
1-26
REV.-A `1 1.8.2 ROMA Board (Main Board) Figure 1-16 shows the ROMA board, which contains an HD64 180R1 P6 (main) CPU andaPPD7810HG (sub) CPU to control the operation of the printer. Driver circuits for the motors, solenoids, printhead, and sensors are also included on this board. The main ICS on the ROMA board are: CPU q HD64180R1 P6 (1 3A) . . . . . . . . . . . q pPD7810HG (7B) . . . . . . . . . . . . . . . . . . 8-bit one-chip CPU (main control) 8-bit one-chip CPU (sub control)
Gate Array IC q EO5A1OAA (1 4A) . . . . . . . . . . . . . . . . . . . Memory management unit (MMU) IC q E05A02LA (2A) . . . . . . . . . . . . . . . . . . . . . . Printhead data control IC
q E05A09BA (4B) . . . . . . . . . . . . . . . . . . . . . Carriage (CR) and paper feed (PF) motors phase pulse control unit (MCU) IC q E05A09BA (3B) . . . . . . . . . . . . . . . . . . . . . Platen gap (PG) and color select (CS) motors phase pulse control unit (MCU) IC ") Memory IC q EP-ROM (1 1A) . . . . . . . . . . . . . . . . . . . . . . . . . q MASK-ROM (1 2A) . . . . . . . . . . . . . . . . . . q ST-RAM* (1OA) . . . . . . . . . . . . . . . . . . . . . . . Main CPU program, 256 K-bit Character generator, 2M-bit Holds status data, panel data, 256 K-bit q EP-ROM (7A) . . . . . . . . . . . . . . . . . . . . . . . . . . . Sub CPU program, 256 K-bit q PS-RAM (9A) . . . . . . . . . . . . . . . . . . . . . . . . . . . Buffers, working area, 256 K-bit x: This memory is backed-up by a lithium battery. Universal IC q M546 10P (1 1 B) . . . . . . . . . . . . . . . . . . . . . 8-bit parallel interface IC q S17304 (7C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . CR motor driver IC q STK6981 H (7D) . . . . . . . . . . . . . . . . . . . . . PF motor driver IC q H8D2148 (2C) . . . . . . . . . . . . . . . . . . . . . . . . q STK66082E (1A) . . . . . . . . . . . . . . . . . . . Head fan (HF) motor controller and driver IC Printhead driver IC
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7 A 7B 9 A 1 0 A 1 1 A 1 2 A
13A
14A
1A --
2°C
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7'D 7C
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Figure 1-16. ROMA Board
1-27
... ..Y :\ f ~· The power supply circuit board is one of two boards, the ROPS for 100- 120 V AC operation or the "-" ROPSE for 220- 240 V operation. The basic construction of the two boards are the same: each board
REV.-A
1.8.3 ROPS\ROPSE Board (Power Supply Circuit Board)
contains a fuse, line filter, and switching regulator circuit. Compact circuitry is made possible by the use of a DC-to-DC converter.
L
...
ROPS Board
f" - , :.,
--+
.'
..--. +
-------------
.-
ROPSE Board Figure 1-17. ROPS/ROPSE Board
1-28
REV.-A ) 1.8.4 Fan U n i t A fan unit is used to lower the internal temperature of the printer. It removes heat within the printer housing that is generated by the electric circuits.
.
Figure 1-18. Fan Unit
1.8.5 Housing The housing consists of the upper and lower cases and accommodates the control panel, printer mechanism, control circuit board, power circuit, and fan unit. The optional cartridges (e.g., font and identity modules) can be mounted easily without removing the upper case. Figure 1-19 shows the LQ-2250 housings.
)
.
Figure. 1-19. Housing
1-29
REV.-A 1.8.6 Control Panel This section describes the control panel functions. 1.8.6.1 Hardware Specification On the control Panel, there are twelve non-locking switches, sixteen LEDs, and a 20-column LCD (Liquid Crystal Display) as shown in Figure 1-20. The functions of the switches and indicators are given immediately below the illustration.
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0 0 POWER TEAR 0 READY 0 PAPER OUT ~ o ON LINE
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LCD
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Figure 1-20. Control Panel ON LINE Switch This switch toggles the printer between ON-LINE and OFF-LINE. If the printer is set OFF-LINE, printing is stopped and the printer becomes BUSY. This switch is also used in the SelecType function. ON LINE LED (Green) Lights in the ON-LINE mode. Blinks when the printhead temperature is too high. FORM FEED Switch Pressing this switch once while the printer is OFF-LINE, advances the paper ve~ically to the next top-of-form position. This switch is also used for the micro adjustment function, the platen gap adjustment function, and the SelecType function. LINE FEED Switch When the printer is OFF-LINE, the paper advances continuously one line at a time if this switch is pressed for more than 0.5 seconds. The space between lines of text is set using the line spacing command. This switch is also used for the micro adjustment function, the platen gap adjustment function, and the SelecType function. LOAD/EJECT Switch
Pressing this switch when the printer is OFF-LINE, loads or ejects the paper (If a page is inserted in the cut sheet feeder, it is loaded; if a page is already loaded, it is ejected). Details of the paper loading and ejection process are described in Section 1.8.1.2. This switch is also used in the SelecType function.
("--., :.
.: .. . .
1-30
REV.-A
)
FONT Switch Pressing this switch selects a font, and holding the switch for more than 1.0 second cycles through the fonts sequentially. The LCD displays the currently selected font. PITCH Switch Pressing this switch selects the character pitch, and holdingthe switch for more than 1.0 second cycles through the character pitches sequentially. The LCD displays the currently selected character pitch. CONDENSED Switch Pressing this switch selects normal or condensed printing. CONDENSED LED (Green) Lights when condensed mode is selected. PAPER SELECT Switch Selects the paper. Each time this switch is pressed, the paper handling method changes in the following order: TRACTOR, FRICTION, CSF BIN 1, CSF BIN2. Each LED and the LCD displays the currently selected
paper handling. .) TRACTOR LED (Green) Lights when tractor feed is selected.
FRICTION LED (Green) Lights when friction feed is selected.
CSF LED (Green) Lights when CSF mode is selected. TEAR OFF Switch Advance the paper to the tear-off position. This switch is only effective for the tractor feed (Refer to Section 1.8.1.2.). TEAR OFF LED (Orange) Lights when the tear-off function is enabled. MICRO FEED Switch Selects or cancels the micro adjustment function. When this function is enabled, the LED on this switch and the V and A LEDs are lit. In the micro feed mode, the LINE FEED switch is used to feed the paper backward and the FORM FEED switch is used to feed the paper forward. Paper feed performed in this micro feed mode does not affect the page position control. This function is also used to adjust the paper loading position and to adjust the paper to meet the tear-off edge (Refer to Section 1.8.1.2.). ) MICRO FEED LED (Orange) Lights when micro feed is enabled. PLATEN GAP ADJUST Switch Selects or cancels the platen gap adjustment function. When this function is selected, three LEDs (A, V, and the LED on this switch) are lit and the LINE FEED and FORM FEED switches are used to increase
and decrease the platen gap respectively. The relative platen gap value message is displayed on the
LCD. "+" level means to be widened. "-" level means to be narrowed. The limits of adjustment are +0. 14mm to O. 1 4mm. PLATEN GAP ADJUST LED (Orange) Lights when the platen gap adjustment function is enabled. SelecType Switch Selects or cancels the SelecType function. When the SelecType function is selected, the LED on this switch is lit and the functions of the ON LINE, FORM FEED, LINE FEED, and LOAD/EJECT switches are
changed for the SelecType function. SelecType LED (Orange) Lights when SelecType mode is selected. ) 1-31
REV.-A Other LEDs POWER LED (Green) Lights when power is ON. READY LED (Green) Lights when the printer can receive data.
PAPER OUT LED (Red) Lights when the paper is at the end.
D a A V LED (Yellow) Lights the setting for the SelecType, tear-off, micro adjustment, and platen gap
adjustment functions. 1.8.6.2 SelecType Function
This function is invoked when the SelecType switch is pressed (except during `printing). When" this
function is invoked, the printer beeps and the message `"SelecType MODE'" is displayed.. In the SelecType function, major functions can be set by operating the ON LINE (a). FORM FEED (A), LINE FEED
(V), and LOAD/EJECT (D) switches. By pressing the SelecType switch the second time the printer exits
this mode and returns to the ON-LINE mode. Exiting without performing "SAVE MACRO" or "SAVE DEFAULTS" means that MACRO settings or DEFAULT settings will not be stored in the backup memory. q Refer to Figure 1-21 for the entire SelecType operational sequence. The SelecType mode has five menus. While the message "SeiecType MODE" is displayed, every time ~' the LINE FEED (V) switch is pressed, the main menu of this mode is displayed in the order: LOAD MACRO Function in which the settings stored in one of the four macro channels can be read out and set as the current SelecType settings. CHANGE MACRO Function in which the current settings can be changed and stored into one of the four macro channels. The twelve settings and their options are shown in Table 1-18. CHANGE DEFAULTS Functions in which the default settings shown can be changed. the default settings and options are shown in Table 1-19. PRINT OUT SETTINGS Function in which all settings in macro channels and the defaults can be printed out. CLEAR ALL MACROS Function which all settings in macro channels are cleared.
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1-32
REV.-A
CHAPTER 2 OPERATING PRINCIPLES
.. 2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2.1.1 Connector Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.1.2 Printer Mechanism Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.1.2.1 Printing Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2.1.2.2 Platen Gap Adjustment Mechanism . . . . . . . . . . . . . 2-8 2.1.2.3 Carriage Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 2.1.2.4 Paper Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 2.2 POWER SUPPLY CIRCUIT OPERATION (ROPS/ROPSE . Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25
2.2.1 ROPS/ROPSE Board Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-25 . . 2.2.2 Input Filter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27 2.2.3 Rectifier, Smoothing, and Surge-suppression Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 2.2.4 Main Switching Circuit 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -28 2.2.5 +5 V and +12 V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 2.2.5.1 +5 V Current Limiting and Voltage Regulator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 . 2.2.6 Main Switching Circuit 2 (+35 V Supply Circuit) . . . . . 2-34 2.2.7 +35 V Current Limiting and Voltage Regulator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36 .. 2.2.8 Over Voltage Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 2.3 CONTROL CIRCUIT BOARD (ROMA Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40 2.3.1 Reset Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42 2.3.1.1 VX (Drive System Pull-up) Voltage Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 2.3.1.2 Power ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44 2.3.1.3 INIT Signal Input from CN1 or CN2 . . . . . . . . . . . . . 2-45 2.3.1.4 Font/Identity Module Installation and Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46 2.3.1.5 ST-RAM (1 OA) Battery Backup Circuit . . . . . . . . 2-47 2.3.2 interface...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 2.3.2.1 2.3.2.2 8-Bit Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 RS-232C Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52
2.3.3 Control Panel Interface Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55 2.3.3.1 LED Drive Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-56
Z.i
REV.-A
, `-', 2.3.3.2 Switch Status Read Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57 2.3.3.3 LCD Control/Drive Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 2.3.4 State Detection and Sensor Signal Input Circuits . . . . . 2-61 2.3.4.1 Reference Voltage Supply Circuit . . . . . . . . . . . . . . . . . . 2-63 2.3.4.2 35 V Line Voltage Detection Circuit . . . . . . . . . . . . . 2-64 2.3.4.3 VR1/VR2 Reading Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 2.3.4.4 Printhead Temperature Detection Circuit... 2-66 2.3.4.5 PW Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-67 2.3.4.6 PT Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-68 2.3.4.7 PG HP Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 2.3.4.8 CR HP Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 2.3.4.9 PE Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-71 2.3.4.10 RL/LD Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72 2.3.4.11 Case Open Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73 2.3.5 Printhead Control/Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74 2.3.5.1 E05A02LA Gate Array (2A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75 2.3.5.2 Printhead Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76 2.3.5.3 Relationship Between Paper Thickness and Print Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-78 2.3.5.4 Relationship Between the First Printhead Drive Pulse Width and +35 V Line Voltage . . . . . . . . . . 2-79 2.3.6 HF Motor Control/Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80 2.3.7 CR and PF Motors Control/Drive Circuit . . . . . . . . . . . . . . . . . . . . . . 2-82 2.3.7.1 E05A09BA Gate Array (MCU: 4B)............ . . . . . 2-83 2.3.7.2 CR Motor Control/Drive Circuit . . . . . . . . . . . . . . . . . . . . . 2-84 2.3.7.3 PF Motor Control/Drive Circuit . . . . . . . . . . . . . . . . . . . . . . 2-93 2.3.8 PG and CS Motors Control/Drive Circuits . . . . . . . . . . . . . . . . . . . 2-98 2.3.8.1 E05A09BA Gate Array (MCU: 3B)............ . . . . . 2-99 2.3.8.2 PG Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-100 2.3.8.3 CS Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102 2.3.9 PT/RL/LD Solenoid Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104 2.3.10 Buzzer Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-105 2.3.11 Initialization Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-106
i..
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,.: c
- - J '
LIST OF FIGURES
Figure 2-1. Figure 2-2. Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Printer Mechanism Block Diagram .., ,,...,,,,,. ,..,.,....,,, .,., 2-4 ..$. .,
Z.ii
REV.-A Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 2-8. Figure 2-9. Figure 2-10. Figure 2-11. Figure 2-12. Figure 2-13. Figure 2-14. Figure 2-15. Figure 2-16. Figure 2-17. Printing Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Printhead Cooling Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Platen Gap Adjustment Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Paper Thickness Detection Mechanism . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Paper Thickness Detection Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Platen Gap Adjustment Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 PW Sensor Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11 Ribbon Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13 Color Ribbon Strip Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Color Select Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15 Push Tractor Feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17 . Friction Feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -18 Paper Release Mechanism Operations . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Paper Loading Lever Open/Close Mechanism . Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24 Figure 2-18. Figure 2-19. Figure 2-20. ROPS/ROPSE Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Input Filter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 . Rectifier, Smoothing, and Surge-suppression Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 Figure 2-21. Figure 2-22. Figure 2-23. Figure 2-24. Figure 2-25. Figure 2-26. Figure 2-27. Figure 2-28. Figure 2-29. Figure 2-30. Surge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 . Main Switching Circuit 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
Main Switching Circuit 1 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 +5 V and +12 V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 +5 V Current Limiting Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 +5 V Voltage Regulator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Main Switching Circuit 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-34 +35 V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-35 Main Switching Circuit 2 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 +35 V Current Limiting and Voltage Regulator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .