Epson LQ-510 - Page 41

REV.-A
PRINCIPLES OF OPERATION
Figure 2-23.
Figure 2-24.
Figure 2-25.
Figure 2-26.
Figure 2-27.
Figure 2-28.
Figure 2-29.
Figure 2-30.
Figure 2-31.
Figure 2-32.
Figure 2-33.
Figure 2-34.
Figure 2-35.
Figure 2-36.
Figure 2-37.
Figure 2-38.
Figure 2-39.
Figure 2-40.
Figure 2-41.
Figure 2-42.
Figure 2-43.
Figure 2-44.
Figure 2-45.
Figure 2-46.
Figure 2-47.
Figure 2-48.
Figure 2-49.
Figure 2-50.
Figure 2-51.
Figure 2-52.
Figure 2-53.
Figure 2-54.
Figure 2-55.
Figure 2-56.
Figure 2-57.
Figure 2-58.
Figure 2-59.
Figure 2-60.
Figure 2-61.
Figure 2-62.
Switching Circuit (During PCI Operation)
...........................
2-20
Over-Current Protection (OCP)
..........................................
2-20
+ 5 VDC Regulator Circuit
................................................
2-21
Oscillator Waveforms
.......................................................
2-22
Constant Voltage Control
.................................................
2-22
EAI Output
......................................................................
2-22
Over-Current Protection (OCP)
..........................................
2-23
lC494 Internal Circuit
.......................................................
2-24
PWM Output
....................................................................
2-24
Voltage Limiting Circuit
....................................................
2-25
± 12 VDC Supply Circuit
.................................................
2-26
Vx Voltage Circuit
............................................................
2-27
Reset Circuit
...................................................................
2-28
RESET Output
.................................................................
2-29
RESET Pulse Oscillation Process (Module Mounted).
......... 2-30
RESET Pulse Oscillation Process (Module Removed)
......... 2-31
INIT Signal Input Circuit
...................................................
2-32
Address Decoder
.............................................................
2-33
Bank Register
..................................................................
2-34
Carriage Mechanism
........................................................
2-35
Carriage Drive Circuit Block Diagram
................................ 2-36
Gate Array Operation
.......................................................
2-37
Carriage Motor Drive Circuit
.............................................
2-38
SLA7020M Circuit Diagram
...............................................
2-39
Phase Data Input Timing (2-2 Phase)
................................ 2-40
Phase Signal Timing Chart (2-2 Phase)
............................. 2-40
Phase Data Input Circuit (1-2 Phase)
.................................
2-41
Phase Signal Timing Chart (1-2 Phase)
.............................
2-41
Phase Data Conversion Circuit
.........................................
2-42
Reference Voltage Generation Circuit
...............................
2-43
Constant Current Control Circuit
.......................................
2-44
Waveforms
......................................................................
2-45
Carriage Motor Control
.....................................................
2-48
Home-Position Seek
.........................................................
2-49
Printing Area and Printing Timing
.....................................
2-50
Friction-Feed Operation
...................................................
2-51
Push-Tractor-Feed Operation
............................................
2-52
Paper-Feed Motor Drive Circuit
.........................................
2-53
Paper-Feed Motor Drive Timing Chart
...............................
2-54
Printhead Printing Operation
............................................
2-55
LQ-510
2-iii