Table of Contents
Page
Service Guide ML320/ML321
0 About This Manual
Front Cover
1
Manual Copyright
2
Manual Part Number and Revision
3
1 Product Specifications
1.1 General Description
4
....1.1.02 Serial Number Identification & (A-D) Revision Levels
5
........Compatibility Chart
6
1.2 Product Specifications
7
1.3 Paper Specifications
8
1.4 Physical Specifications
9
1.5 Power Requirements
10
1.6 Environmental Requirements
11
1.7 Agency Approvals
12
1.8 Options
13
1.9 Consumables
14
1.10 Memory Specifications
15
1.11 Reliability Specifications
16
2 Principles of Operation
2.1 Printer Overview
17
2.2 Circuit Board Description
18
....2.2.01 Operator Panel Board
19
....2.2.02 Power Supply
20
....2.2.03 Control Board
21
........Large Scale Integrated Circuitry (LSI)
22
2.3 Electrical Operation
23
....2.3.01 Initialization
24
....2.3.02 Interface Control
25
....2.3.03 Print Head Drive Circuit
26
....2.3.04 Spacing Operation
27
....2.3.05 Line Feed
28
....2.3.06 Alarm Circuit
29
2.4 Mechanical Principle Of Operation & Block Diagrams
30
....2.4.01 Printhead
31
....2.4.02 Space Mechanism / Operation
32
........Head Gap Adjusting Mechanism
33
....2.4.03 Ribbon Drive Mechanism / Operation
34
....2.4.04 Paper Feed Mechanism
35
....2.4.05 Paper-End Detection Mechanism
36
....2.4.06 Semi-Automatic Sheet Feeder (SASF) Operation
37
3 Maintenance & Disassembly
Maintenance & Disassembly
38