Oki Microline 3321 Maintenance Manual

42089201TH Rev.4 4 /
Oki Data CONFIDENTIAL
CONTENTS
1. CONFIGURATION ...........................................................................................6
1.1. Standard Printer Configuration ..................................................................................... 6
1.2 Options .......................................................................................................................... 7
2. THEORY OF OPERATION .............................................................................9
2.1 Electrical Operation ....................................................................................................... 9
2.1.1 Summary .......................................................................................................... 9
2.1.2 Microprocessor and the Peripheral Circuit ..................................................... 9
2.1.3 Initialization..................................................................................................... 15
2.1.4 Parallel Interface Control ............................................................................... 16
2.1.5 Universal Serial Bus (USB) (at USB Ver.) ................................................... 17
2.1.6 Print Control ................................................................................................... 19
2.1.7 SP/LF Motor Control...................................................................................... 21
2.1.8 Operation Panel ............................................................................................. 23
2.1.9 Alarm Circuit .................................................................................................. 25
2.1.10 Power Supply Circuit ..................................................................................... 27
2.2 Mechanical Operation ................................................................................................. 28
2.2.1 Printhead Mechanism and Operation (See Figure 2-2.).............................. 28
2.2.2 Spacing Operation (See Figure 2-4.) ........................................................... 31
2.2.3 Head Gap Adjusting (See Figure 2-5.)......................................................... 32
2.2.4 Ribbon Drive (See Figure 2-6.) .................................................................... 34
2.2.5 Paper Feed Operation ................................................................................... 35
2.2.6 Paper Detection Mechanism (See Figure 2-15.).......................................... 45
2.2.7 Automatic Sheet Feed ................................................................................... 47
2.2.8 Paper Park Function (Continuous paper) ..................................................... 49
3. ASSEMBLY/DISASSEMBLY .........................................................................50
3.1 Precaution for Parts Replacement ............................................................................. 50
3.2 Service Tools .............................................................................................................. 51
3.3 Disassembly/Reassembly Procedure ......................................................................... 52
3.3.1 Printhead ........................................................................................................ 54
3.3.2 Ribbon Protector ............................................................................................ 55
3.3.3 Pull-up Roller Assy ........................................................................................ 56
3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy ................ 57
3.3.5 Gear Case Assy ............................................................................................ 58
3.3.6 PC Connector ................................................................................................ 59
3.3.7 Space Motor, Guide Roller Assy .................................................................. 60
3.3.8 Space Rack.................................................................................................... 61
3.3.9 Carriage Cable ............................................................................................... 62
3.3.10 Backup Roller Holder Assy ........................................................................... 63
3.3.11 Platen Assy .................................................................................................... 64
3.3.12.1Driver Board (DVE/DVF) (at USB Ver.) ....................................................... 65
3.3.12.2Driver Board (SDF) (at non USB Ver.) ........................................................ 66
3.3.13 LF Motor......................................................................................................... 67
3.3.14 Operation Panel PCB (LEOP)....................................................................... 68
3.3.15 Control/Power Supply Board (AOE/AOU/AOO) ............................................ 69
3.3.16 Transformer Assy........................................................................................... 70
3.3.17 Change Lever and Gears.............................................................................. 71
3.3.18 Carriage Shaft ................................................................................................ 72
3.3.19 Paper Pan ...................................................................................................... 73
3.3.20 Rear Tractor Assy ......................................................................................... 74

Oki Microline 3321 Specifications

General

Brand	Oki
Model	Microline 3321
Category	Printer
Language	English