User Manuals: Brother LW-810ic Typewriter

Manuals and User Guides for Brother LW-810ic Typewriter. We have 1 Brother LW-810ic Typewriter manual available for free PDF download: Service Manual

Brother LW-810ic Service Manual

Brother LW-810ic Service Manual (194 pages)

WORD PROCESSOR

Brand: Brother | Category: Typewriter | Size: 3 MB

Table of Contents

Table of Contents
2
Part Itheory of Operation

13
Chapter 1 Mechanical Theory

13
- Fig. 1.1 Ink Jet Printer Assembly
  13
  - Ink Jet Printer System Configuration
    14
- Ink Jet Printer
  13
Chapter 2 Electrical Theory

37
- System Configuration
  37
- Fig. 2.1 Major Electronic Component Parts
  38
  - Ink Jet Printer Configuration
    39
    
    Carriage Home Position Sensor
    39
    
    Carriage Motor
    39
    
    Ink Cartridge
    39
    
    Line Feed Motor
    39
    
    PE (Paper End) Sensor
    39
  - Power Supply Circuit
    40
    
    Configuration
    40
- Fig. 2.2 Power Supply Circuit
  40
  - Generator
    41
- Fig. 2.3 Timing Chart of +24V Generation Circuit
  41
- Fig. 2.4 Timing Chart of +5V Generation Circuit
  41
  - Reset Circuit
    42
    
    Configuration
    42
- Fig. 2.5 Reset Circuit
  42
  - CBIC and Peripherals
    43
    
    Cbic #9
    43
    
    FDC (Floppy Disk Controller)
    43
    
    Main RAM (#10, #11)
    43
    
    Main ROM (#12, #13)
    43
    
    Printer Driver Circuits (#2, #3, Q1 to Q4, and Q14 to Q17)
    43
    
    Video RAM (#7)
    43
    
    Buzzer Drive Circuit
    44
    
    Clock Circuit
    44
- Fig. 2.6 Buzzer Drive Circuit
  44
  - Table 2.1 Clock Circuit
    44
  - Country Specification Change-Over
    45
- Fig. 2.7 Country & Model Specification Change-Over Circuit
  45
  - RS-232C I/F Circuit
    46
- Fig. 2.8 RS-232C I/F Circuit
  46
  - Printer Control
    47
    
    Ink Jet Head Control
    47
- Fig. 2.9 Ink Jet Head Drive Circuit
  47
  - Carriage Motor Control
    48
- Fig. 2.10 Carriage Motor Drive Circuit
  48
  - Line Feed Motor Control
    49
- Fig. 2.11 Line Feed Motor Drive Circuit
  49
  - Carriage Home Position Sensor
    50
  - PE Sensor
    50
- Fig. 2.12 Carriage Home Position Sensor Circuit
  50
- Fig. 2.13 PE Sensor Detection Circuit
  50
  - Switch PCB
    51
    
    Configuration
    51
- Fig. 2.14 External View of the Switch PCB
  51
- Fig. 2.15 Switch PCB Circuit
  51
  - Keyboard System
    52
    
    FPC Operation
    52
- Fig. 2.16 Key/Fpc Operation
  52
  - Keyboard Scan
    53
- Fig. 2.17 Electrode Wiring
  53
  - Keyboard Control Circuit
    54
- Fig. 2.18 Keyboard Control Circuit
  54
- Fig. 2.19 Keyboard Matrix
  55
- Fig. 2.20 Keyboard Symbols (Corresponding to Keyboard Matrix in Fig. 2.19)
  55
- Fig. 2.21 LCD Display Operation Block Diagram
  56
  - SRAM (#7) Access
    57
- Fig. 2.22 Example of Control Signal Timing Chart
  57
- Table 2.2 Table of LCD Modules
  57
- Fig. 2.23 LCD Drive Voltage Generation Circuit (Minus Voltage VEE)
  58
- Fig. 2.24 LCD Drive Voltage Generation Circuit (Plus Voltage VEE)
  58
- Fig.2.25 CFL Backlight Circuit
  59
  - FDD (Floppy Disk Drive) Control
    60
    
    FDD Configuration
    60
    
    Table 2.3 FDC(#5) and FDD Module Links (Interface Signals)
    60
    
    10.2.1. Basic Operation
    61
    
    FDD Operation
    61
    
    Interface between CBIC (#8) and FDC (#5)
    61
- Fig.2.26 FDD Block Diagram
  61
  - FDD Module
    62
    
    10.3.1. Read/Write Circuit
    62
    
    10.3.2. Motor Drive Circuit
    62
    
    10.3.3. Sensor Circuits
    62
Part II Repair

64
Chapter 3 Troubleshooting

64
- Introduction
  64
- Precautions
  64
  - Personal Safety
    64
  - Handling ESD-Sensitive Parts
    64
- Checks before Repair
  65
- Checks after Repair
  66
- Troubleshooting Flow Charts
  67
Chapter 4 Component Disassembly

116
Chapter 5 Monitor Repair and Adjustment (Model Ct-1450)

177
Chapter 6 Maintenance

177
Appendix A Specifications

188
- Electrical System
  188
- Printing
  189
- Keyboard
  191
- Environmental Tolerance
  192
- Dimensions & Weight
  193

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