Epson L-1000, LQ-500 Service Manual
LQ-500 L-1000
TECHNICAL MANUAL
EPSON
FCC COMPLIANCE STATEMENT
FOR AMERICAN USERS
This equipment uses and generates radio frequency energy and if not installed and used properly, that is,
in strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception. It has been type tested and found to comply with limits for a Class B computing device in accordance
with Sub-part J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such
interference in a residential installation. However, there is no guarantee that interference will not occur in
a particular installation. If this equipment does cause interference to radio or television reception, which can
be determined by turning the equipment on and off, the user is encouraged to try to correct the interference
by one or more of the following measures:
l reorient the receiving antenna
l relocate the computer with respect to the receiver
l move the computer away from the receiver
l plug the computer into a different outlet so that the computer and receiver are on different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television technician for additional
suggestions. The user may find the following booklet, prepared by the Federal Communications Commission, helpful: “ How to Identify and Resolve Radio-TV Interference Problems.” This booklet is available from
the U.S. Government Printing Office, Washington, D.C., 20402, Stock No. 004-000-00345-4.
© 1988 Seiko Epson Corporation
Epson America, Inc.
Service
23610 Telo Avenue
Torrance, California 90505
All rights reserved. No portion of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electric, mechanical, photocopying, recording, or otherwise, without the
written permission of Epson America, Inc. No patent liability is assumed with respect to use of the information contained herein. While every precaution has been taken in the preparation of this book, Epson America,
Inc., assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting
from the use of the information contained herein.
Epson@
is a registered trademark of Seiko Epson Corporation
LQ-500TM is a trademark of Epson America, Inc.
LQ-500/L-1000
iii
REVISION SHEET
REV.-A
iv
LQ-500/ L-1000
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 heading.
WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below always should be observed when performing
repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND
PERIPHERAL DEVICES BEFORE PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURE.
2. NO WORKSHOULD 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 products 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 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 recommended by the
manufacturer,. introduction of second-source ICs or other nonapproved components may
damage the product and void any applicable Epson warranty.
LQ-500/L-1000
V
REV.-A
PREFACE
This manual describes functions, theory of electrical and mechanical operations,
maintenance, and repair of the LQ-500 and the L-1000. Thoughout this manual both
printers are discussed. When an item is unique to one printer, special notation is
made. Common items are treated in a general format.
The instructions and procedures included here are intended for the experienced repair
technician, who should pay attention 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 - Describes the theory of printer operation
Chapter 3 - Discusses the options.
Chapter 4 - Includes a step-by-step guide for product disassembly, assembly,
and adjustment.
Chapter 5 -
Chapter 6 - Describes preventive maintenance techniques and lists lubricants
* The contents of this manual are subject to change without notice.
Provides Epson-approved techniques for troubleshooting.
and adhesives required to service the equipment.
LQ-500/L-1000
vii
REV.-A
TABLE OF CONTENTS
CHAPTER 1.
CHAPTER 2.
CHAPTER 3.
CHAPTER 4.
CHAPTER 5.
CHAPTER 6.
APPENDIX
PRODUCT DESCRIPTION
PRINCIPLES OF OPERATION
OPTIONAL EQUIPMENT
DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT
TROUBLESHOOTING
MAINTENANCE
LQ-500/L-1000
ix
REV.-A
1.1
1.2
1.3
1.4
1.5
1.6
1.7
CHAPTER
1
GENERAL DESCRIPTION
FEATURES..
SPECIFICATIONS.. ..........................................................................
1.2.1 Hardware
1.2.2
INTERFACE OVERVIEW
DIP
SWITCHES AND JUMPER SETTING ...........................................
1.4.1 DIP Switch
1.4.2 Jumper Setting.. .................................................................
SELECTYPE FUNCTION
OPERATING INSTRUCTIONS
1.6.1 Self-Test
1.6.2
1.6.3 Bit-Image Printing..
1.6.4
1.6.5
1.6.6 Printer Initialization.. ...........................................................
1.6.7
1.6.8
1.6.9
MAIN COMPONENTS
1.7.1
1.7.2
1.7.3
1.7.4
1.7.5
1.7.6
...................................................................................
Specifications
Firmware
Hexadecimal Dump Function
Error
Buzzer Operation
Default
Adjust
Printer Protection
PBMA Board.......................................................................
PEBPNL
PEBFIL
Transformer
Printer Mechanism
Housing
Specifications..
..................................................................
Settings ............................................................
..................................................................
............................................................................
Conditions
Values.. ..................................................................
Lever Operation
Board
Board.. ...................................................................
.............................................................................
.................................................................
.......................................................................
...................................................................
.......................................................................
.......................................................
......................................................
...........................................................
...............................................
.............................................................
................................................................
.......................................................
for Heavy-Duty Printing..
(M-5410) ................................................
..........................
1-1
1-3
1-3
1-7
1-11
1-14
1-14
1-15
1-15
1-16
1-16
1-18
1-19
1-20
1-20
1-20
1-21
1-21
1-22
1-23
1-23
1-24
1-25
1-26
1-27
1-28
FIGURE 1-1.
FIGURE 1-2.
FIGURE 1-3.
FIGURE 1-4.
LQ-500/ L-1000
LIST OF FIGURES
Exterior View of the LQ-500/L-1000..
Pin
Configuration ............................................................
Cut-Sheet Printable Area.. ................................................
Printable Area for Continuous (Sprocket)-Feed Paper
................................
.........
1-2
1-3
1-4
1-5
1
-i
REV.-A
FIGURE 1-5.
FIGURE 1-6.
FIGURE 1-7.
FIGURE 1-8.
FIGURE 1-9.
FIGURE 1-10.
FIGURE 1-11.
FIGURE 1-12.
FIGURE 1-13.
FIGURE 1-14.
FIGURE 1-15.
FIGURE 1-16.
Character
Data Transmission
Self-Test
Hexadecimal Dump Function
Lever
LQ-500/ L-1000
PBMA Main Control Board
PEBPNL Control Panel Board
PEBFIL Filter Board
Transformer
Model
Housing
Matrix..
Printout
Position..
5410
..........................................................................
LIST OF TABLES
TABLE 1-1.
TABLE 1-2.
TABLE 1-3.
TABLE 1-4.
TABLE 1-5.
TABLE 1-6.
TABLE 1-7.
TABLE 1-8.
TABLE 1-9.
TABLE 1-10.
TABLE 1-11.
TABLE 1-12.
TABLE 1-13.
TABLE 1-14.
TABLE 1-15.
TABLE 1-16. Lever Position
Interface Options..
Optional Units
Cut-Sheet
Continuous (Sprocket)
Printing
Character Matrix and Character Size
Connector Pin Assignments and Signal Functions..
Printer Select/Deselect Control
Settings for DIP Switch 1 (SWI)
Settings for DIP Switch 2 (SW2)
International Character Set Selection
Font Selection
Character Pitch Selection
Print Density
Bit Image Printing
Specifications ..................................................
Mode..
............................................................
Timing................................................
............................................................
............................................
...............................................................
Component
.........................................................
....................................................................
Printer
Mechanism..
...........................................................
.................................................................
................................................................
.................................................................
...................................................................
............................................................
.................................................................
Layout..
................................................
Paper Specifications
.................................................
..................................
...........................................
.......................................
......................
.................................
...........
........................................
.......................................
.......................................
................................
1-10
1-11
1-16
1-17
1-20
1-22
1-22
1-23
1-23
1-24
1-24
1-25
1-1
1-1
1-3
1-4
1-8
1-9
1-11
1-13
1-14
1-14
1-14
1-15
1-15
1-18
1-18
1-20
1
-ii
LQ-500 / L-1000
REV.-A
GENERAL DESCRIPTION
1 .1 FEATURES
The LQ-500/L-1000 are small, light-weight, low-cost printers compatible with the LQ-800. The two printers differ in the housing design. All other features are the same. The main features are as follows:
Expanded ESC/P-code printing, implemented as a standard feature
1.
Printing speeds: 180 CPS (alphanumeric Draft 12 CPI)
2.
150 CPS (alphanumeric Draft 10 CPI)
60 CPS (alphanumeric LQ 12 CPI)
50 CPS (alphanumeric LQ 10 CPI)
3. Optional 8100 series interface
4. Clear, easy-to-read printing with a standard EPSON font
5. Two built-in LQ fonts (Roman and Sans Serif)
Optional Font Module to provide a wide variety of fonts
6.
Front panel switch selection of Draft, Roman, Sans Serif, or slot (Optional Font Module) font
7.
8. Automatic paper-loading function
Easy handling of cut sheets with the optional cut-sheet feeder (CSF)
9.
The LQ-500/L-1000 is equipped with the standard EPSON 8-bit parallel interface. Various interface options
enable users to print data from a wide variety of computers. Table l-l lists the interface options, Table l-2
lists the optional units available for the LQ-500/L-1000, and Figure l-l shows an exterior view of the
LQ-500 / L-1000.
Table l-l. Interface Options
NOTE: Refer to the “Optional Interface Technical Manual” for details.
Table 1-2. Optional Units
LQ-500/ L-1000
l-l
GENERAL DESCRIPTION
(Printer Cover A)
R
EV .-A
Figure 1-l.
(Printer Cover B)
Exterior View of the LQ-500/L-I000
LQ-500 / L-1000
1-2
REV.-A
1.2 SPECIFICATIONS
This section describes the specifications for the LQ-500/L-1000 printer.
1.2.1 Hardware Specifications
GENERAL DESCRIPTION
Printing Method
Pin Configuration
Serial, impact, dot matrix
24 wires (12 x 2 staggered, diameter 0.2 mm)
Feeding Method
Line Spacing
Paper Insertion
Paper-Feed Speed
Paper Specifications
LQ-500/ L-1000
Figure 1-2. Pin Configuration
Friction feed, tractor feed (pull tractor)
1/6 inch, or programmable in units of 1/l80 inch
From rear
100 ms/line (at 1/6-inch feed)
2.2 inches per second (continuous feed)
See Tables 1-3 and 1-4
Table 1-3. Cut-Sheet Specifications
1-3
GENERAL DESCRIPTION
Table 1-4. Continuous (Sprocket) Paper Specifications
Printable Area
The figure below illustrates the printable area for cut sheets.
REV.-A
*1) 3 mm or more using 182 mm to 229 mm (7.2 in. to 9 in.) width paper.
27 mm or more using 257 mm (10.1 in.) width paper.
Figure 1-3. Cut-Sheet Printable Area
1-4
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
*1) 13 mm or more using 101 mm to 242 mm (4 in. to 9.5 in.) width paper.
26 mm or more using 254 mm (10 in.) width paper.
l 2) 13 mm or more using 101 mm to 242 mm (4 in. to 9.5 in.) width paper.
24 mm or more using 254 mm (10 in.) width paper.
Figure 1-4. Printable Area for Continuous (Sprocket) -Feed Paper
LQ-500/ L-1000
1-5
GENERAL DESCRIPTION
Ink Ribbon
Type
Color
Reliability
Dimensions of Ribbon
Cartridge
Reliability
Mean Cycles Between Failures
(MCBF)
Mean Time Between Failures
(MTBF)
REV.-A
Exclusive ribbon cartridge
Black
2 million characters at 48 dots/character
293 mm (width) x 34 mm (height) x 72 mm (depth)
3 million lines (excluding printhead)
4000 POH (25% duty)
Life of Printhead
200 million strokes
Safety Approvals
Safety Standards
UL478 (U.S. version)
CSA22.2#154
VDE0806 (TUV) (European version)
Radio Frequency
Interference (RFI)
FCC class B (U.S. version)
VDE0871 (Self-certification) (European version)
Electrical Specifications
Power Conditions
120 VAC ± 10% (120 V version)
220 VAC ± 10% (220 V version)
240 VAC ± 10% (240 V version)
Frequency Range
49.5 to 50.5 Hz (50 Hz version)
59.5 to 60.5 Hz (60 Hz version)
Rating Current
1.8A (120 V version)
0.9A (220 V version)
0.9A (240 V version)
Insulation Resistance
10 Megohms min. (Between AC Line and Chassis)
Dielectric Strength
(Between AC Line and Chassis) 1250 VAC (rms), 1 minute (120 V version)
3750 VAC (rms), 1 minute (220/240 V version)
Environmental Conditions
Temperature
Humidity
Resistance to Shock
Resistance to Vibration
Physical Specifications
Weight
Dimensions
1-6
5 to 35 degrees C -operating
-30 to 60 degrees C -in shipment container
10 to 80 % RH -operating
5 to 85 % RH -storage
1 G, within 1 ms -operating
2 G, within 1 ms -storage
0.25 G, 55 Hz max. -operating
0.50 G, 55 Hz max. -storage
7 Kg
390 mm (width) x 320 (depth) x 139 mm (height), excluding knobs
and paper guides
LQ-500/ L-1000
REV.-A
1.2.2 Firmware Specifications (ESC/P)
GENERAL DESCRIPTION
Control Code
Printing Direction
Input Data Buffer
Character Code
Character Set
Family
Fonts
Printing Mode
Printing Speed
Printing Columns
Character Matrix
Character Size
ESC/PTM level ESC/P-83 (EPSON Standard Code for Printers)
Bidirectional (text)
Bidirectional (bit-image) (when SW 2-6 is ON)
Unidirectional (bit-image) (when SW 2-6 is OFF)
8K bytes (when SW 2-5 is ON)*
1K byte (when SW 2-5 is OFF)
*When DIP SW 2-5 is set on ON, downloading will be ignored.
8 bits
96 ASCII and 13 international character sets
EPSON Roman (Family number: 0)
EPSON Sans Serif (Family number: 1)
EPSON Roman 10, EPSON Roman 12, EPSON Roman 15,
EPSON Roman Proportional;
EPSON Sans Serif 10, EPSON Sans Serif 12,
EPSON Sans Serif 15, EPSON Sans Serif Proportional;
EPSON Draft 10, EPSON Draft 12, EPSON Draft 15.
Selection and mixture of the following modes are allowed, except 15 CPI
Condensed Mode
0 Printing quality (draft/letter quality)
0 Character pitch (10, 12, 15, or proportional)
0 Condensed
0 Double-width
l Double-height
0 Emphasized
0 Double-strike
0
Italic
l Underlined
0 Outline
0 Shadow
See Table 1-5.
See Table 1-5.
See Table 1-6.
See Table 1-6.
LQ-500/ L-1000
1-7
GENERAL DESCRIPTION
REV.-A
Table 1-5. Printing Mode
NOTES:
1. “Max.” means the value when characters of the maximum width were printed.
2. “Min.” means the value when characters of the minimum width were printed.
3. “-" means that “LQ” character set is automatically selected when proportional pitch is specified.
1-8
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
Table 1-6. Character Matrix and Character Size
NOTES:
HDD is horizontal dot density in dots per inch.
1.
Face matrix and character size indicate the size of the maximum character, and this value will be changed
2.
by differences in paper, ribbon, etc.
Unit ESC sp (which also can be sent as the unit followed by the character string CHR$ (&h20)) indicates
3.
the minimum length to be added to the right of the character that can be specified with the ESC sp control
code.
4. 4.""indicates that character matrix is reshaped by printer firmware. Character width becomes half
of noncondensed character width.
LQ-500/L-1000
1-9
GENERAL DESCRIPTION
REV.-A
1-10
Figure 1-5. Character Matrix
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
1.3 INTERFACE OVERVIEW
The 8-bit parallel interface, provided standard with this printer, has the following specifications:
Data Format
Synchronization
Handshaking
Signal Level
Adaptable Connector
Data Transmission Timing
8-bit parallel
By STROBE pulse
By BUSY and ACKNLG signal
TTL-compatible
57-30360 (Amphenol) or equivalent
See Figure 1-6
Figure 1-6. Data Transmission Timing
Table 1-7 shows the connector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-7. Connector Pin Assignments and Signal Functions
LQ-500 / L-1000
1-11
GENERAL DESCRIPTION
Table 1-7. Connector Pin Assignments and Signal Functions (Cont.)
REV.-A
NOTES:
1.
“Dir.” refers to the direction of the signal flow as viewed from the printer.
2.
“Return” denotes a twisted-pair return line.
3. The cable used must be shielded to prevent noise.
4.
All interface conditions are based on TTL levels. Both the rise and fall times of all signals must be less
than 0.2 µs.
5.
The AUTO FEED-XT signal can be set at LOW by DIP switch 2-4.
6.
The SELECT-IN signal can be set at LOW by jumper 6.
7.
Printing tests, including those of the interface circuits, can be performed without using external equipment
by setting DATA 1-8 of the interface connector to certain codes and connecting the ACKNLG signal to the
STROBE signal.
1-12
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
Table 1-8 shows the printer select/deselect (DC1 /DC3) control, including relations among ON-LINE, SELECT-IN
input, DC1 /DC3, and interface signals.
Table 1-8. Printer Select/Deselect Control
NOTES:
1.
In Table 1-8, it is assumed that no ERROR status exists other than that attributable to OFF-LINE mode.
2.
Once the printer is deselected by the DC3 code, the printer will not revert to the selected state unless the
DC1 code is input again. (In the deselected state, the printer ignores input data until the DC1 code is received.)
3.
The DC1 and DC3 codes are enabled only when the SLCT-IN signal (Input Connector 36 for the parallel
interface unit) is HIGH and printer power is initialized.
4.
If the SLCT-IN signal is LOW when the printer is initialized, DC1 /DC3 printer select/deselect control is
invalidated, and these control codes are ignored.
5.
If the SLCT-IN signal is HIGH and is not set to LOW by jumper 6 when printer initialized, the printer
starts from the selected (DCl) state.
LQ-500/ L-1000
1-13
GENERAL DESCRIPTION
REV.-A
1.4 DIP SWITCHES AND JUMPER SETTING
This section describes the DIP switch selections and the jumper setting for the LQ-500/L-1000 printer.
1.4.1 DIP Switch Settings
The two DIP switches for the printer are located inside the ROM cartridge slot cover and function as shown
in Tables 1-9 through 1-13. (Note that the status of the DIP switches is read only at power on or upon receipt
of the INIT signal.)
Table 1-9. Settings for DIP Switch 1 (SW1)
* Unidirectional printing is selected by default, however input of ESC U O can be used to set the print direction to
Bidirectional.
Table 1-11. International Character Set Selection
1-14
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
Table 1-12. Font Selection
1-4 1-5
Off Off
On
Off On
On On
Off
Font
Roman
Sans Serif
Slot
Draft
Table 1-13. Character Pitch Selection
2-7 2-8
Off
On
Off On
On On
Off
Off
Character Pitch
10 CPI
12 CPI
15 CPI
Proportional
1.4.2 Jumper Setting
Jumper 6, which is user-selectable, is located inside the ROM cartridge slot cover. If the jumper is connected,
the SLCT-IN signal is fixed to LOW, and DC1 /DC3 printer select control is ignored.
1.5 SELECTYPE FUNCTION
Selectype allows the user to choose fonts easily while the printer is ON-LINE. This function provides for selec-
tion of Draft, Roman, Sans Serif, or the slot (ROM cartridge) font. SelecType is effective only when the printer
is ON-LINE and is not printing. Font selection is performed by pressing the FORM-FEED switch with the printer
ON-LINE and not printing. The printer’s control panel indicates which font has been specified.
LQ-500/ L-1000
1-15
GENERAL DESCRIPTION
REV.-A
1.6 OPERATING INSTRUCTIONS
This section describes the self-test and hexadecimal dump functions and also includes the error states, printer
initialization, and the buzzer operation.
1.6.1 Self-Test
To begin printing the self-test using Draft mode, turn the printer ON while pressing the LINE-FEED button. To
begin printing the self-test using the Letter Quality (LQ) mode, turn the printer power ON while pressing
FORM-FEED.
Self-test printing can be stopped or started by pressing ON-LINE (ON-LINE indicator is not lit). To finish the
self-test, stop the printing by pressing the ON-LINE switch and turn OFF the printer power.
The firmware revision number is printed as the first line of the self-test, and subsequently, current DIP switch
settings are printed.
1-16
Figure 1-7. Self-Test Printout
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
1.6.2 Hexadecimal Dump Function
The printer enters HEX-DUMP mode when it is powered on while the LINE-FEED and FORM-FEED buttons
are pressed down. In HEX-DUMP mode, the hexadecimal representation of the input data is printed out, along
with corresponding ASCII characters. This function is valuable for checking the data the printer has received
from the host. If input data is a control code rather than a character code, a period (.) is printed in the ASCII column.
Data Dump Mode
LQ-500/ L-1000
Figure 1-8. Hexadecimal Dump Function
1-17
GENERAL DESCRIPTION
1.6.3 Bit-Image Printing
This printer has four standard print densities, listed below in dots per inch (dpi):
120 dpi (including half dots): Triple speed
180 dpi (including half dots): Double speed
240 dpi (including half dots): 1.5 speed
360 dpi (including half dots): Normal speed
The firmware, however, implements the print densities as shown in Table 1-14
Table 1-14. Print Density
REV.-A
NOTES: ESC* m n1 n2 [DATA] n2 x 256 + n1
dpi = dots per inch
ips = inches per second
The firmware handles the print densities as shown in Table 1-15.
Table 1-15. Bit-Image Printing
1-18
LQ-500/ L-1000
REV.-A
GENERAL DESCRIPTION
1.6.4 Error Conditions
If any of the following error conditions is detected, the printer automatically enters OFF-LINE mode.
0 Home position is not detected at printer mechanism initialization.
e Home position is detected during printing.
0 ON-LINE is pressed, and the printer enters OFF-LINE.
l A paper-out signal is detected and forms-override is finished.
0 Paper out is detected after the printer performs a paper-loading operation with the cut-sheet feeder enabled.
The following interface signals are output to indicate the error and to halt data transmission:
BUSY signal becomes HIGH.
ERROR becomes LOW.
No ACKNLG pulse is sent.
1.6.5 Buzzer Operation
The buzzer sounds under the following circumstances:
0 When the BEL code is sent to the printer (0.5-second ring).
0
When a paper-out error is detected, the buzzer sounds 3 times (rings for 0.1 second with a 0.1-second interval).
0 When abnormal carriage movement is detected, the buzzer sounds 5 times (rings for 0.5 second, with a 0.5-
second interval).
l When a panel setting is accepted (0.1-second ring).
1.6.6 Printer Initialization
There are two initialization methods: hardware initialization and software initialization.
Hardware Initialization
This type of initialization takes place when the printer power switch is turned ON (and the AC power cord is
plugged in) or when the INIT signal is received over the parallel interface line.
When the printer is initialized, it performs the following actions:
(a) Initializes printer mechanism.
(b) Clears input data buffer.
(c) Clears downloaded character set.
(d) Clears the print buffer.
(e) Returns printer settings to their default values.
Software Initialization
This type of initialization takes place when the printer receives the software initialize code. Upon receipt of this
code, the printer does not perform the functions listed above under (a), (b), and (c). The settings changed by
the last SelecType operation are reset.
LQ-500/ L-1000
1-19
GENERAL DESCRIPTION
1.6.7 Default Values
When the printer is initialized, the following default values or functions are set:
REV.-A
Page Position
Left and Right Margins
Line Spacing
Vertical Tabs
Horizontal Tabs
VFH Channel
Category of Type Style
Current paper position becomes top-of-form position
Released
116 inch
Cleared
Every 8 characters (relative)
Channel 0
SelecType - Software initialization
DIP switch - Hardware initialization
Downloaded Characters
Deselected - Software initialization
Cleared - Hardware initialization
Justification
Character Spacing
Bit-Image Mode Assignment
Left justification
10 CPI
ESC K = ESC + 0, ESC L = ESC * 1
ESC Y = ESC * 2, ESC Z = ESC * 3
Printing Effects
Cleared
1.6.8 Adjust Lever Operation
The head adjust lever must be set to the proper position according to the paper thickness. See Table 1-16
and Figure 1-9.
Table 1-16. Lever Position Operation
1-20
Figure 1-9. Lever Position
LQ-500/ L-1000
REV.-A.
GENERAL DESCRIPTION
1.6.9 Printer Protection for Heavy-Duty Printing
This printer has “printhead protection” to safeguard the printhead from overheating or from voltage dropping
to the head driver.
If head temperature exceeds upper limit value, then printing is automatically stopped until head temperature
has dropped to a certain value to resume printing.
If heavy-duty printing causes the voltage supplied to the head drive circuit to drop to the lower limit, then printing is interrupted immediately, and thereafter, if power supply voltage is recovered to a certain value, then the
remaining print line will be printed. This protection will occur when half or more of the wires are activated
simultaneously and continuously.
LQ-500/L-1000
1-21
GENERAL DESCRIPTION
REV.-A
1.7 MAIN COMPONENTS
The main components of the LQ-500/L-1000 printer are designed for easy removal and replacement to maintain/repair the printer. The main components are:
1) PBMA board:
2) PEBPNL board:
3) PEBFIL board:
4) Transformer
5) M-5410:
The main control board; the CPU on this board controls all main functions
The control panel board.
The filter circuit board.
The printer mechanism.
Figure 1-10. LQ-500/L-1000 Component Layout
1.7.1 PBMA Board
The use of the µPD7810HG CPU makes the main control board simple in its circuit design.
Figure 1-11. PBMA Main Control Board
1-22
LQ-500/ L-1000
Loading...