DLQ-3000+
Rev. A
2-18
2.3.2 Reset Circuit
The hardware reset circuit for this printer has 2 reset ICs: RST592D (IC22) and RST594E
(IC20). When the +5 v for logic line is unstable dew to power-on, it outputs the reset signal
until the +5 VDC line is stabilized to avoid abnormal operation of the printer. RST592D
monitors the Flash-ROM with the threshold voltage set at approximately 4.2 VDC. It outputs
the reset signal until the +5 VDC line is stabilized to 4.2 VDC. The Flash-ROM recovers from
the reset condition before the CPU and the gate arrays recover from the reset condition.
RST594E monitors the CPU and the gate arrays. The threshold voltage is set at
approximately 4.2 VDC. The reset signals is kept output until the +5 VDC line is 4.2 VDC.
Since the reset signal from the RST592D is sent to the manual reset terminal (MRST) in the
RST594E via the output port of the CPU, the Flash-ROM recovers from the reset condition
before the CPU and the gate arrays recover from the reset condition.
Flash-ROM
VCC
RP
MRST
VOUT
+5V
+5V
VCC
VOUT
RST
RSTIN
P61
PST592D
Reset IC
CPU
Gate Array
System Bus
PST594E
Reset IC
E05B46
Figure 2-13. Reset Circuit Block Diagram
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 ...