Operating Principles
Rev. A
2-15
2.3 Controller Circuit
This section describes the controller circuit of this printer. This printer uses a 112-pin/QFP-
type/16-bit microprocessor H8/3003 (IC16) for the CPU and drives it with the clock frequency
of 14.7 MHz. The control program is stored in the 1-Mbit Flash-ROM (IC15) or PROM
(IC18).The CPU receives the external reset signal and control the printer based on the
control program. When the Flash-ROM is in use, the control program can be transferred by
way of the parallel interface. DRAM is used as a work area and buffers. A non-volatile
memory EEPROM (IC23) stores information such as default values, customer data, total
printing amount value and PG adjustment value. The gate array E05B46 (IC25) controls the
following:
Clock
Addresses
Memory
DRAM
Parallel I/F
Type-B I/F
Ports
Motors
Bitmap
Printheads
It is also used for the PG measurement. The gate array E05A89 functions as the panel
interface controlled by the CPU. It is directly attached to the control panel circuit board to
simplify the circuits. See Table 2-10 which lists the main ICs and their functions.
Table 2-10. Main ICs and their Functions
IC
Location
Function
CPU (
)
IC16
The main CPU of the controller circuit
Gate Array (E05B46)
IC25
Controls systems and peripheral devices.
Gate Array (E05A89) (built
in the panel circuit board.)
Functions as the I/F between the control panel
and controller circuit.
Flash-ROM
IC15
Stores the control program.
PROM
IC18
Stores the control program when the Flash-ROM
is not equipped.
CG (8-Mbit MROM)
IC21
Character generator
CG (4/8-Mbit MROM)
IC24
Character generator
DRAM (
)
IC26
Manages buffers and work area. (4Mbit)
EEPROM
(AT93C66 equivalent))
IC23
Stores values for default setting, customer data
and so on.
Reset IC (RST592D)
IC22
Resets hardware
Rests Flash-ROM (Recovery from the reset
condition is done for Flash-ROM prior to the
CPU and gate arrays.)
Reset IC (RST594E)
IC20
Reset hardware
Resets the CPU and gate arrays.
CR motor driver
(SLA7026)
IC7
Drives the CR motor by constant current/uni-polar
drive.
PF motor driver
(SLA7024M)
IC6
Drives the PF motor by constant current/uni-polar
drive.
Ribbon driver (MP5320)
QM2
Drives the ribbon motor on the CR by constant
current/uni-polar drive.
PG motor (SDC03-V1)
QM1
Drives the PG motor by constant current/uni-polar
drive.
Serial I/F transceiver IC
(MAX232CWE)
IC14
Transceiver circuit for the serial I/F
Shunt regulator (TL431)
IC19
Produces the reference voltage (power supply for
the stabilizing the +5V) for the A/D converter.
3-terminal regulator
(LM75L12)
IC17
Stabilizes 12V power supply voltage for head pre-
drive.
Summary of Contents for DLQ-3000+
Page 1: ...EPSON EPSON EPSON France S A SERVICE MANUAL DLQ 3000 PRODUIT ...
Page 2: ...EPSON 24 PIN DOT MATRIX PRINTER EPSON DLQ 3000 SERVICE MANUAL SEIKO EPSON CORPORATION 4008259 ...
Page 6: ...v REVISION SHEET Revision Issued Data Contents Rev A August 21 1997 First Release ...
Page 62: ...2 3 12 Other Sensor Circuits 2 30 ...
Page 160: ...Chapter 6 Maintenance 6 1 Maintenance 6 1 6 1 1 Lubrication and Adhesion 6 1 ...
Page 171: ...DLQ 3000 Rev A A 6 ...
Page 172: ...Appendix Rev A A 7 A 2 Circuit Diagrams Figure A 2 C210 MAIN Board Circuit Diagram 1 2 ...
Page 173: ...DLQ 3000 Rev A A 8 ...
Page 174: ...Appendix Rev A A 9 Figure A 3 C210 MAIN Board Circuit Diagram 2 2 ...
Page 175: ...DLQ 3000 Rev A A 10 ...
Page 177: ...DLQ 3000 Rev A A 12 Figure A 5 C124 PSB Board Circuit Diagram ...
Page 180: ...Appendix Rev A A 15 Figure A 8 C210 MAIN Board Component Layout 2 2 ...
Page 181: ...DLQ 3000 Rev A A 16 Figure A 9 C124 PSB Board Component Layout ...
Page 182: ...Appendix Rev A A 17 Figure A 10 C124 PSE Board Component Layout ...
Page 189: ...EPSON SEIKO EPSON CORPORATION ...
Page 254: ...PC 437 USA Europe standard Annexe A 27 ...
Page 255: ...PC 850 Multilingue PC 860 Portugais PC 863 Français canadien PC 865 Norvégien A 28 Annexe ...
Page 256: ...PC861 Islandais BRASCII Portugais brésilien Abicomp Portugais brésilien Annexe A 29 ...
Page 259: ...A 32 Annexe ...
Page 262: ...Utilisation du sommaire des commandes A 10 V Vitesse 2 25 W Windows Microsoft 1 17 18 Index 3 ...