
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.
Summary of Contents for DLQ-3000 Minerva+
Page 1: ...EPSON 24 PIN DOT MATRIX PRINTER EPSON DLQ 3000 SERVICE MANUAL SEIKO EPSON CORPORATION 4008259 ...
Page 5: ...v REVISION SHEET Revision Issued Data Contents Rev A August 21 1997 First Release ...
Page 61: ...2 3 12 Other Sensor Circuits 2 31 ...
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 ...