Oki ML421 Maintenance Manual - Page 5

Rs-232c Serial Interface Board Option

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Oki Data CONFIDENTIAL 3.3.20 Rear Tractor Assy 76 3.3.21 Rear Pressure Assy 77 3.3.22 Switch Lever ...78 4. ADJUSTMENT 79 5. CLEANING AND LUBRICATION 87 5.1 Cleaning ...87 5.2 Lubrication ...88 6. TROUBLESHOOTING AND REPAIR 95 6.1 Items to Check Before Repair 95 6.2 Troubleshooting Table ...95 6.3 Lamp Display ...96 6.4 Connection Circuit Check for Printhead and SP/LF Motor 100 6.5 Troubleshooting flow chart 102 APPENDIX A PCB LAYOUT 114 APPENDIX B SPARE PARTS LIST 115 APPENDIX C RS-232C SERIAL INTERFACE BOARD (OPTION 126 1. GENERAL ...126 2. OPERATION DESCRIPTION 126 2.1 Element Description 126 2.2 Circuit Description ...127 2.2.1 Operation at power on 127 2.2.2. RS-232C interface 127 2.3 Communication Procedure Flowchart 128 2.3.1 Mode a ...128 2.3.2 Mode b ...129 3. TROUBLESHOOTING FLOWCHART 130 3.1 Before Repairing a Fault 130 3.2 Troubleshooting ...130 3.3 Local Test ...133 3.3.1 Circuit test mode 133 42113901 Rev.2 5 /

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42113901
Rev.2
5 /
Oki
Data
CONFIDENTIAL
3.3.20
Rear Tractor Assy
.................................................................................................
76
3.3.21
Rear Pressure Assy
..............................................................................................
77
3.3.22
Switch Lever
.........................................................................................................
78
4. ADJUSTMENT
...................................................................................................
79
5.
CLEANING AND LUBRICATION
.......................................................................
87
5.1
Cleaning
.............................................................................................................................
87
5.2
Lubrication
.........................................................................................................................
88
6.
TROUBLESHOOTING AND REPAIR
................................................................
95
6.1
Items to Check Before Repair
............................................................................................
95
6.2
Troubleshooting Table
.......................................................................................................
95
6.3
Lamp Display
.....................................................................................................................
96
6.4
Connection Circuit Check for Printhead and SP/LF Motor
...............................................
100
6.5
Troubleshooting flow chart
...............................................................................................
102
APPENDIX A
PCB LAYOUT
...............................................................................
114
APPENDIX B
SPARE PARTS LIST
....................................................................
115
APPENDIX C
RS-232C SERIAL INTERFACE BOARD (OPTION)
....................
126
1.
GENERAL
............................................................................................................................
126
2.
OPERATION DESCRIPTION
..............................................................................................
126
2.1
Element Description
..................................................................................................
126
2.2
Circuit Description
.....................................................................................................
127
2.2.1
Operation at power on
....................................................................................
127
2.2.2.
RS-232C interface
..........................................................................................
127
2.3
Communication Procedure Flowchart
.......................................................................
128
2.3.1
Mode
a
..........................................................................................................
128
2.3.2
Mode
b
..........................................................................................................
129
3.
TROUBLESHOOTING FLOWCHART
.................................................................................
130
3.1
Before Repairing a Fault
............................................................................................
130
3.2
Troubleshooting
.........................................................................................................
130
3.3
Local Test
..................................................................................................................
133
3.3.1
Circuit test mode
............................................................................................
133