Oki ML490 Maintenance Manual - Page 4

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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 ...16 2.1.4 Interface Control 17 2.1.5 Print Control ...20 2.1.6 SP/LF Motor Control 22 2.1.7 Operation Panel ...25 2.1.8 Alarm Circuit ...27 2.1.9 Power Supply Circuit 30 2.2 Mechanical Operation ...31 2.2.1 Printhead mechanism and operation (See Figure 2-2 31 2.2.2 Spacing operation (See Figure 2-4 34 2.2.3 Head gap adjusting (See Figure 2-5 35 2.2.4 Ribbon drive (See Figure 2-6 37 2.2.5 Paper feed operation 39 2.2.6 Paper detection mechanism (See Figure 2-14 49 2.2.7 Automatic sheet feed 51 2.2.8 Paper park function (continuous paper 53 3. ASSEMBLY/DISASSEMBLY 54 3.1 Precaution for Parts Replacement 54 3.2 Service Tools ...55 3.3 Disassembly/Reassembly Procedure 56 3.3.1 Printhead ...58 3.3.2 Ribbon Protector 59 3.3.3 Pull-up Roller Assy 60 3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy 61 3.3.5 Gear Case Assy ...62 3.3.6 PC Connector ...63 3.3.7 Space Motor, Guide Roller Assy 64 3.3.8 Space Rack ...65 3.3.9 Carriage Cable ...66 3.3.10 Backup Roller Holder Assy 67 3.3.11 Platen Assy ...68 3.3.12 Control Board (TFS 69 3.3.13 LF Motor ...70 3.3.14 Operation Panel Board (LEOP 71 3.3.15 Power Supply Board (TPW 72 3.3.16 Transformer Assy 73 3.3.17 Change Lever and Gears 74 3.3.18 Carriage Shaft ...75 3.3.19 Paper Pan ...76 42114101 Rev.1 4 /

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42114101
Rev.1
4 /
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
...........................................................................................................
16
2.1.4
Interface Control
...................................................................................................
17
2.1.5
Print Control
..........................................................................................................
20
2.1.6
SP/LF Motor Control
.............................................................................................
22
2.1.7
Operation Panel
....................................................................................................
25
2.1.8
Alarm Circuit
.........................................................................................................
27
2.1.9
Power Supply Circuit
.............................................................................................
30
2.2
Mechanical Operation
........................................................................................................
31
2.2.1
Printhead mechanism and operation (See Figure 2-2.)
........................................
31
2.2.2
Spacing operation (See Figure 2-4.)
.....................................................................
34
2.2.3
Head gap adjusting (See Figure 2-5.)
...................................................................
35
2.2.4
Ribbon drive (See Figure 2-6.)
..............................................................................
37
2.2.5
Paper feed operation
............................................................................................
39
2.2.6
Paper detection mechanism (See Figure 2-14.)
...................................................
49
2.2.7
Automatic sheet feed
............................................................................................
51
2.2.8
Paper park function (continuous paper)
................................................................
53
3. ASSEMBLY/DISASSEMBLY
..............................................................................
54
3.1
Precaution for Parts Replacement
.....................................................................................
54
3.2
Service Tools
.....................................................................................................................
55
3.3
Disassembly/Reassembly Procedure
................................................................................
56
3.3.1
Printhead
...............................................................................................................
58
3.3.2
Ribbon Protector
...................................................................................................
59
3.3.3
Pull-up Roller Assy
................................................................................................
60
3.3.4
Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
...........................
61
3.3.5
Gear Case Assy
....................................................................................................
62
3.3.6
PC Connector
.......................................................................................................
63
3.3.7
Space Motor, Guide Roller Assy
...........................................................................
64
3.3.8
Space Rack
...........................................................................................................
65
3.3.9
Carriage Cable
......................................................................................................
66
3.3.10
Backup Roller Holder Assy
...................................................................................
67
3.3.11
Platen Assy
...........................................................................................................
68
3.3.12
Control Board (TFS)
..............................................................................................
69
3.3.13
LF Motor
................................................................................................................
70
3.3.14
Operation Panel Board (LEOP)
............................................................................
71
3.3.15
Power Supply Board (TPW)
..................................................................................
72
3.3.16
Transformer Assy
..................................................................................................
73
3.3.17
Change Lever and Gears
......................................................................................
74
3.3.18
Carriage Shaft
.......................................................................................................
75
3.3.19
Paper Pan
.............................................................................................................
76