Epson AP-4000, Technical Manual

Page: 41 / 226

REV.-A
PRINCIPLES OF OPERATION
Figure 2-23.
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Figure 2-25.
Figure 2-26.
Figure 2-27.
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Figure 2-30.
Figure 2-31.
Figure 2-32.
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Figure 2-48.
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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