Epson LQ-510 - Page 40

PRINCIPLES OF OPERATION
REV.-A
2.3.6 Printhead
............................................................................
2-55
2.3.6.1 Printhead Printing Operation
................................. 2-55
2.3.6.2 Printhead Specifications
........................................ 2-55
2.3.6.3
Printhead Drive Circuit Block Diagram..
..................
2-56
2.3.6.4
Gate Array E05A02 Operation in Printhead
Drive Circuit
.........................................................
2-57
2.3.6.5 Printhead Drive Circuit ..........................................
2-56
2.3.6.6 Printhead Software Control
................................... 2-59
2.3.7 A/D Converter Circuit
.......................................................... 2-60
2.3.8 Host Interface
.....................................................................
2-63
2.3.9 EEPROM Circuit ..................................................................
2-64
2.3.10 Ribbon-Feed Mechanism
......................................................
2-65
LIST OF FIGURES
Figure 2-1.
Figure 2-2.
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.
Figure 2-18.
Figure 2-19.
Figure 2-20.
Figure 2-21.
Figure 2-22.
Cable Connections
...........................................................
2-2
Printer Mechanism Block Diagram
.................................... 2-3
Paper-End Sensor Mechanism ..........................................
2-4
Paper-End Sensor Circuit .................................................
2-4
Home-Position Sensor Mechanism
.................................... 2-5
Home-Position Sensor Circuit ...........................................
2-5
Thermal Sensor Mechanism (Printhead Temperature
Detection) .......................................................................
2-6
Thermal Sensor Circuit ....................................................
2-6
Platen Gap Sensor Mechanism
.........................................
2-7
Platen Gap Sensor Circuit ................................................
2-7
Friction/Tractor Sensor Mechanism
.................................. 2-8
Friction/Tractor Sensor Circuit .........................................
2-8
Printhead
........................................................................
2-9
Overview of
Power Supply Circuit Operation
.....................
2-10
Control Circuit Block Diagram ..........................................
2-11
Power Supply Circuit Block Diagram
.................................
2-13
Filter Circuit (SANPS Board,
120 V Version).
.....................
2-14
Filter Circuit (SANPSE Board, 220/240 V Version)
.............
2-14
Rectifier and Smoothing Circuit
........................................ 2-15
Starting Circuit (Main Switching Circuit)
............................ 2-17
Main Switching Circuit Waveforms
.................................... 2-18
+24 VDC Voltage Control Circuit
...................................... 2-19
2-ii
LQ-510