43471801TH Rev.1
4 /
Oki Data CONFIDENTIAL
Contents
1. CONFIGURATION .............................................................................................. 6
1.1
Standard Printer Configuration ............................................................................................ 6
2. OPERATION ........................................................................................................7
2.1
Summary .............................................................................................................................. 7
2.2
Circuit Operation (See Figure 1) .......................................................................................... 8
2.2.1
CPU and peripheral circuits .................................................................................... 8
2.2.2
Initializing operation .............................................................................................. 10
2.2.3
Controlling the interface ........................................................................................ 10
2.2.4
Print head control drive circuit .............................................................................. 10
2.2.5
Spacing ................................................................................................................. 11
2.2.6
Line feed ............................................................................................................... 11
2.2.7
Alarm circuit .......................................................................................................... 11
2.2.8
Paper-end detect circuit ........................................................................................ 11
2.2.9
Power source unit ................................................................................................. 11
2.3
Mechanical Operation ........................................................................................................ 12
2.3.1
The Printhead Mechanism and Its Operation (see figure 2) ................................. 12
2.3.2
Mechanism and operation of space (see figure 3) ................................................ 13
2.3.3
Mechanism for adjusting the head gap (see figure 4) ........................................... 14
2.3.4
Mechanism and operation of ribbon feed (See figure 5) ....................................... 15
2.3.5
Paper Feed Operation .......................................................................................... 16
2.3.6
Paper Detection Mechanism ................................................................................ 23
2.3.7
Automatic Sheet Feed (See Figure 14.) ............................................................... 25
2.3.8
Paper Park Function (Continuous paper) ............................................................. 27
3. ASSEMBLY/DISASSEMBLY ..............................................................................28
3.1
Precaution for Parts Replacement ..................................................................................... 28
3.2
Service Tools29
3.3
Disassembly/Reassembly Procedure ................................................................................ 30
3.3.1
Ribbon Protector ................................................................................................... 32
3.3.2
Printhead ............................................................................................................... 33
3.3.3
Pull-up Roller Assy ................................................................................................ 34
3.3.4
Upper Cover Assy, Access Cover Assy and Sheet Guide Assy ........................... 35
3.3.5
Platen Assy ........................................................................................................... 36
3.3.6
Printer unit ............................................................................................................. 37
3.3.7
Carriage Cable, Homing sensor ............................................................................ 38
3.3.8
Idle-pulley .............................................................................................................. 39
3.3.9
Ribbon Feed Assy. ................................................................................................ 40
3.3.10 Stepping Motor (Space) ........................................................................................ 41
3.3.11 LF Motor ................................................................................................................ 42
3.3.12 Gap Sensor Cable, Gap SW and continuous-form/cut-sheet SW ........................ 43
3.3.13 Slider Pice-Slider .................................................................................................. 44
3.3.14 Mini Pitch Belt ......................................................................................................... 45
3.3.15 Paper Pan Assy, Roller Assy ................................................................................ 46
3.3.16 Bottom sensor, photo interrupter and sensor cord (6P) ........................................ 47
3.3.17 Operation Panel Board and Operation Panel cord ............................................... 48
3.3.18 Control Board Assy. ................................................................................................ 49
3.3.19 Power supply Assy ................................................................................................ 50
