Table of Contents
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REV.-A
2.4.2.5
Carriage Position Control
2-51
2.4.2.6
Print Timing Signal Generation
2-52
2.4.2.7
Print Head
2-53
2.4.2.8
Printer Head Controls
2-56
2.4.2.9
Printer Head Drive Circuit
2-57
2.4.3
Ink Mechanism
2-62
2.4.3.1
Pump Motor Operation
2-63
2.4.3.2
Pump Motor Control and Drive Circuit
2-64
2.4.3.3
Pump Mechanism
2-64
2.4.3.4
Pump Construction
2-65
2.4.3.5
Capping Mechanism
2-65
2.4.3.6
Brushing Mechanism
2·66
2.4.3.7
Valve Mechanism
2-66
2.4.3.8
Valve Solenoid Driving Circuit
2-67
2.4.3.9
Cap Damper and Ink Reservoir
2-68
2.4.3.10 Ink Cartridge and Ink End Sensor
2·68
2.4.3.11 Operation Sequence of Pump Unit
2-70
2.4.4
Vx Power Supply Circuit and Reset Signal Circuit
2-71
2.4.5
Timer and Backup Circuitry
2-72
LIST OF FIGURES
Figure 2-1.
SO-850/2550 Component Connections
2-2
Figure 2-2.
Summary of the Printer Mechanism
2-5
Figure 2-3.
Overview of Power Supply Circuit Operation
2-6
Figure 2-4.
Control Circuit Block Diagram
2-10
Figure 2-5.
Power Supply Circuit Block Diagram
2-11
Figure 2·6.
Filter Circuit (SEIPS Board,120V Version)
2-12
Figure 2·7.
Filter Circuit (SANPSE Board, 220/240V Version)
2-12
Figure 2·8.
Rectifier and Smoothing Circuit
2-13
Figure 2-9.
Starting Circuit (Main Switching Circuit)
2·14
Figure 2-10. Main Switching Circuit Waveforms
2-15
Figure 2·11. + 24 VDC Voltage Control Circuit
2-16
Figure 2-12. Switching Circuit (When PC1 Operation)
2·17
Figure 2·13. Over-Current Protection (OCP)
2-17
Figure 2·14. +5 VDC Regulator Circuit
2-18
Figure 2·15. Oscillator Waveforms
2-19
2-ii
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