Epson L-1000 Technical Manual page 34

REV.-A
PRINCIPLES OF OPERATION
OVERVIEW .....................................................................................
2.1
2.1.1
2.1.2
2.1.3
2.1.4
PRINCIPLES OF OPERATION.. .........................................................
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
LQ-500/L-1000
CHAPTER 2
Summary of Connectors.. ....................................................
Overview of Printer Mechanism Operation.. .......................... 2-3
2.1.2.1 Sensors.. .............................................................
2.1.2.2 Motors ................................................................
Printhead ............................................................
2.1.2.3
Overview of Circuitry.. ........................................................
Firmware Overview .............................................................
Power Supply Circuit ..........................................................
Power Supply Circuit Block Diagram ..................... 2-9
2.2.1.1
2.2.1.2 Chopper-Type Switching Regulator Circuit.. ........... 2-13
Filter Circuit ........................................................
2.2.1.3
2.2.1.4 Transformer .........................................................
2.2.1.5 Rectifier and Smoothing Circuit ............................ 2-11
2.2.1.6 + 5 VDC Regulator Circuit ....................................
2.2.1.7 Pulse-Width Modulation (PWM) Circuit.. ................. 2-16
2.2.1.8 + 24 VDC Regulator Circuit.. ................................. 2-18
2.2.1.9 + 12 VDC Supply Circuit.. .....................................
2.2.1 .10 Vx Voltage Supply Circuit.. ................................... 2-21
Reset Circuit ......................................................................
Firmware Operation at Reset.. .............................................
Address Decorder and Bank Register.. ................................. 2-30
Carriage Operation .............................................................
2.2.5.1
Carriage Mechanism .............................................
2.2.5.2 Carriage Motor Specifications.. ............................. 2-32
2.2.5.3
Carriage Motor Drive Circuit Block Diagram.. ......... 2-33
2.2.5.4
Gate Array EOlA05KA Operation in Carriage
Motor Drive Circuit ...............................................
2.2.5.5
Carriage Motor Drive Circuit ................................. 2-36
2.2.5.6
Carriage Motor Software Control.. ......................... 2-42
Paper Feed ........................................................................
2.2.6.1
Paper-Feed Mechanism Operation ......................... 2-49
2.2.6.2
Paper-Feed Motor Specifications.. ......................... 2-51
2-1
2-1
2-4
2-6
2-6
2-7
2-8
2-9
2-9
2-12
2-12
2-14
2-20
2-22
2-26
2-32
2-32
2-34
2-49
2-i