Specifications

REV.-B
CHAPTER 2
OPERATION PRINCIPLES
2.1 OVERVIEW OF
PRINTER MECHANISM
OPERATION.. .............
2-1
2.1.1 Printhead Mechanism
..............................................................
2-1
2.1.2 Carriage
Movement Mechanism..
........................................
2-2
2.1.3 Paper
Feed Mechanism.. .........................................................
2-3
2.1.3.1 Paper
Advance Mechanisms..
.................................... 2-3
2.1.3.2 Paper Insertion Entrances
...........................................
2-6
2.1.4 Ribbon Advance Mechanism
.................................................
2-10
2.2 POWER SUPPLY OPERATION
...........................................................
2-11
2.2.1 Power Supply Overview
.........................................................
2-11
2.2.2 Supply
Circuit Operation..
......................................................
2-11
2.3 CONTROL CIRCUIT OPERATION
.....................................................
2-13
2.3.1 Control
Circuit Operation
Overview..
.................................
2-13
2.3.2 Reset Circuit
...............................................................................
2-15
2.3.3 Sensor
Circuits..
.........................................................................
2-16
2.3.4 MOTOR,
CR Drive Circuit.. ....................................................
2-17
2.3.5 MOTOR,
PF Drive Circuit.. .....................................................
2-18
2.3.6 Printhead
Drive Circuit..
.........................................................
2-19
2.3.7 Parallel
Interface Circuit.. ......................................................
2-20
2.3.7 EEPROM
Control
Circuit..
......................................................
2-20
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.
How
the Printhead Works.. ................................................
2-1
Carriage
Movement.. .............................................................
2-2
Paper-Thickness Gap LEVER, G, ADJUST
Movement..
...............................................................................
2-2
Top Entrance
Friction Feed..
...............................................
2-3
Push
Tractor Operation .......................................................
2-4
Pull Tractor
Operation.. ........................................................
2-5
Push-Pull
Tractor Operation..
.............................................
2-5
LEVER,
RELEASE Movement
.............................................
2-6
Paper
Path for Top Entrance
Friction Feed.. ................
2-6
Paper Path for Rear Entrance Push Tractor Feed
......
2-7
Paper Path for Rear Entrance Push-Pull
Tractor
Feed.. ...........................................................................
2-7
2-i