Table of Contents
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CHAPTER 2
OPERATING PRINCIPLES
2.1
OVER VIEW
2-1
2.2
Summary of the Theory of Operation
2-2
2.2.1
Component Connections
2-2
2.2.2
Summary of the Printer Mechanism
2-4
2.2.3
Summary of the Power Supply Circuit
2-6
2.2.4
Summary of the Control Circuit
2-7
2.3
OPERATION OF THE POWER SUPPLY CIRCUIT
2-11
2.3.1
Power Supply Circuit Block Diagram
2-11
2.3.2
Filter Circuit
2-12
2.3.3
Rectifier and Smoothing Circuit
2-13
2.3.4
Starting Circuit (Main Switching Circuit)
2·13
2.3.5
+
24 VDC Voltage Control Circuit
2·16
2.3.6
+
5 VDC Regulator Circuit
2-18
2.3.7
Voltage Limitig Circuit
2-22
2.3.8
±
12 VDC Supply Circuit
2-23
2.4
CONTROL CIRCUIT AND PRINTER
MECHANISM OPERATION
2-24
2.4.1
Operation of the Paper Feed Mechanism
2-24
2.4.1.1
Paper feed mechanism
2·24
2.4.1.2
Paper Feed Motor Control
2-26
2.4.1.3
Paper Feed Motor Drive Circuit
2-28
2.4.1.4
Top Edge Holder Mechanism Operation
2-33
2.4.1.5
TE Holder Motor Contol
2-34
2.4.1.6
Top Edge Holder Motor Drive Circuit
2-36
2.4.1.7
Paper-end Sensor and Top·edge Sensor
2·37
2.4.1.8
Paper Change Mechanism
(Friction Tractor)
2-39
2.4.1.9
Control Circuit
for the Paper Change Mechanism
2-40
2.4.1.10 CSF Sensor
2-41
2.4.2
Operation of the Print Mechanism
2-42
2.4.2.1
Carriage Mechanism
2·42
2.4.2.2
Carriage Motor Control
2-44
2.4.2.3
Revolution control
2-45
2.4.2.4
Drive Circuit Control
2-49
2-i
REV.-A
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