Xerox Diablo 1620 Manuals

Manuals and User Guides for Xerox Diablo 1620. We have 2 Xerox Diablo 1620 manuals available for free PDF download: Maintenance Manual, Manual

Xerox Diablo 1620 Maintenance Manual

Xerox Diablo 1620 Maintenance Manual (221 pages)

HyTerm Communications Terminal

Brand: Xerox | Category: Printer | Size: 4 MB

Table of Contents

Table of Contents
5
Hyterm Communications Terminal
12
Section 1 - Introduction
13
1.1 General Description
13
1.2 Scope
13
1.3 Related Documents
13
Section 2 - Theory of Operation
15
Introduction
15
General Operation
15
HPRO Board Block Diagram
16
8080 Microprocessing Unit (MPU)
17
Architecture
17
Timing
17
Basic Processor Operation
17
Typical Instruction Cycle (Output Instruction)
17
Clock Generator (8224)
18
Bus Driver/System Controller (8228)
19
Bus Control
19
System Logic Control
19
Memory Timing
20
I/O Port Numbering
20
Input Port
20
Interrupt Handling
21
Memory
21
Addressing
21
Reading
21
Writing
21
Timing
21
Input/Output
21
I/O Port (8212)
22
Keyboard Data Input (Port 0)
22
Keyboard Control Switch Input (Port 1)
22
Control Panel Switch Inputs (Ports 2 and 3)
22
Baud Rate Factor (Output Port 1)
23
Miscellaneous Outputs (Port 0)
23
USART (Ports 4 and 14)
23
Miscellaneous Circuitry
24
3-Terminal Voltage Regulators
24
Level Converters
24
USART Control/Status Words
24
Jumpers
25
I/O Ports 5, 6, and 7
25
HPRO Jumpers
25
Transfer of Information from the Printer
27
Carriage and Printwheel Position Data
27
Position Latches
27
Carriage Counter Decrement Control
28
Block Diagram, LOGIC-2 Board
28
Carriage Counter Control
29
Printwheel Counter Control
29
Option Jumpers
29
Oscillator
29
Logic-2 Board, Part No. 40510-4X
29
Program Control Loop
30
Data Processing Loop
30
Data Output Loop
30
Basic Operation
30
Timing
30
Servo Board, Part No. 40520-XX
30
Basic Operation, Printer Microprocessor
30
D-A Converter Circuit
32
Sample and Hold Circuit
32
Servo Direction Switching
32
Typical Sample and Hold Circuit
33
Carriage Position Tachometer Circuit
34
Servo Tachometer Circuits
35
Servo Summation Amplifier
35
Servo Position Transducer
36
Transducer (XDCR) Board, Part No. 40515-03
37
Sine-Wave Drive Generator
37
Servo Position Transducer
37
Servo Feedback Amplifier
37
Servo Feedback Amplifier Waveforms
38
Servo Feedback Demodulator/Integrator/Amplifier
39
Carriage Power Amplifier Board, Part No. 40525-XX
41
Carriage Power Amplifier Circuit
41
Servo Feedback Circuit
41
Power Monitor Circuit
42
Paper Feed Drive Circuit
42
Printwheel Power Amplifier Circuit
44
Paper Feed Drive Waveforms
44
Ribbon Lift Driver Circuit
45
Ribbon Feed Drive Circuit
45
Hammer Energy Control and Drive Circuit
45
Hcur L Board (Optional)
46
General Operation
46
Receiver Circuit
46
Block Diagram, Current Loop Data Flow
47
Transmitter Circuit
48
Current Loop Operation
48
Full Duplex, Passive
50
Full Duplex, Active
50
Half-Duplex, Passive
50
Half-Duplex, Active
50
Power Supplies
50
Key Positions of Hall-Effect and Saturable-Core Keyboards
50
2.10 Keyboard
51
Key Encoding
51
2.10.1.2 Mos Decoder/Encoder
52
2.10.1.3 Strobe Generation
52
2.10.1.4 Output Drivers
53
2.10.1.5 Logic Levels
53
Saturable-Core Keyboard (Schematic No. 400512-01)
53
Basic Operation
53
Keyswitch
53
2.10.2.3 Encoder/Decoder/Processor
54
Address Logic
54
2-39. Block Diagram, Saturable-Core Keyboard
54
2.10.2.5 Keyswitch Matrix
56
2.10.2.6 Sense Amplifier
56
2.10.2.7 Strobe Logic
56
Function Key Logic
57
Control Panel
57
Sense Amplifier TPA and TPB
57
Switches
59
Form Length Switch
59
Audible Alarm
59
Indicators
59
2.12 Power Supply
59
2.12.1 Boschert Power Supply Part No. 26021-XX
59
General Description
59
2.12.1.2 Isolation
60
2.1.2.1.3 Theory of Operation
60
2.12.1.4 Input Current Limiting
60
2.12.1.5 Input Rfi Fi Lter
60
Full-Wave Bridge Rectifier
60
Local +15 Volt Power Supply
60
Power Switch and Switching Regulator Amplifier
61
Lcsmoothing Filter
61
Spike Catcher
61
Inverter
61
Dcoutputcircuits
61
Volt Error Amplifier
61
Opto-Isolator
61
Block Diagram, LHR Power Supply
62
LHR Power Supply, Part No. 400062-01
63
Detailed Description
63
Section 3 - Maintenance
69
Introduction
69
General Rules
69
Top Cover Removal
69
3.2 Maintenance Procedures
70
Supplies
70
Cleaning and Inspection
71
Lubrication
71
Carrier System
71
Carriage System Lubrication Points
72
Carriage System
73
Platen System
73
Covers and Switches
73
Module/Subassembly Removal and Replacement
74
Circuit Boards
74
Hcurl Board Field Installation
74
Major Assemblies and Modules
74
Current Loop Connections
76
Power Supply
77
Control Panel
78
Power Supply Connections
78
Keyboard
79
Keyswitch Replacement
79
Cooling Fan
80
Paper Feed Motor
80
Paper Feed Motor Removal
80
Paper Carrier Subassembly
81
Carrier System Removal
81
Carrier System Removal
82
Carrier System Replacement
82
Carriage Subassembly
83
3.4 Adjustments
86
Printer
86
Carrier Assembly Adjustment
87
Paper Feed (Platen) Drive Adjustments
88
Carriage Drive Cable Adjustment
88
Adjustment Tools
89
Platen-To-Printwheel Adjustment
91
Ribbon Height Adjustment
94
Hammer Adjustments
95
Hammer Adjustment Tool
95
Carriage Home Adjustment
96
Paper Chute Adjustment
97
Paper-Out Switch Adjustment
100
Reference Designators
101
Keyboard Cable
105
Power Supply Connections
106
Integrated Circuits
108
Ascii Code Chart
173
Schematics and Logic Drawings
174

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Xerox Diablo 1620 Manual

Xerox Diablo 1620 Manual (78 pages)

HyTerm Communications Terminal

Brand: Xerox | Category: Printer | Size: 4 MB

Table of Contents

Table of Contents
5
Hyterm Communications Terminal
10
Introduction . '·1
11
1.2 Main Features
11
- Printer
  11
  - Switch Panels
    11
- Keyboard. '·2
  12
- 1.2.4 Communications Capability
  12
1.3 Specifications
12
- S I Z
  12
- 1.3.2 Weight
  12
- 1.3.3 Power Requirements
  12
  - Environ Mental Requirements. 1·2
    12
- Printer. 1·2
  12
- Interface 1·3
  13
- Color
  13
Functional Features. 1·3
13
Control Panel
14
Printwheel
14
Optional Features 1·4
14
1.6 Accessories
14
Related Documents
15
Switches, Indicators, and Controls
16
Control Panel
17
Section 2 - Operating Instructions
17
Introduction
17
Switches, Indicators, and Controls
17
- Front Panel
  17
Front Panel Switches and Indicators
18
- Keyboard . 2·5
  21
  - Keyboard 2:2.3.1
    21
  - Alphameric Section
    21
Printer Controls
22
- Control Section
  23
- Printer Controls
  23
- Impression Control Switch
  24
  - Cover-Open Switch
    24
- Paper-Out-Switch
  25
Platen Removal
25
- Bottom-Feed Printer
  26
- Establishing the Data Communications Link.
  27
Basic Operating Procedures
25
- Turn-On
  25
- Loading Paper
  25
  - Top-Feed Printer.
    25
Error Recovery
29
- Margins (ESC 9, ESC 0)
  30
- Carriage Movement
  30
- Paper Movement
  30
- 2.3.5.4 Ribbon Control
  30
- Operator Duties
  31
  - Replacing Ribbon Cartridge
    31
Ribbon Clamps
31
Ribbon Advance Knob
32
- Changing Printwheels
  33
- Changing Platens
  35
  - Platen Removal
    36
  - Standard Platen (Friction-Feed) Installation
    36
Pin-Feed Platen Installation
36
- Pin-Feed Platen Installation
  37
- Forms Tractor
  37
Forms Tractor
38
Forms Tractor and Platen Adjust Lever
38
Forms Tractor and Paper Release Lever (Tension Removed)
39
Section 3 - Functional Description
41
- Introduction
  41
  - Local/Remote
    41
- Communications Princi Pies
  41
- Reset/Initialization
  41
- Character Generation
  41
  - Two- and Three-Character Sequences
    41
Printing Format Factors
42
- Printing Format
  43
  - Definition of Terms
    43
  - Standard Formats
    43
  - Optional Formats (Variable Indexing)
    43
    
    Variable HMI
    44
    
    Variable VMI
    44
- Control Functions
  44
  - Control of Printing
    44
    
    Red/Black Printing (ESC A/ESC B)
    44
    
    Upper Case on Iy
    44
  - Control of Carriage Movement
    45
    
    Space (SP)
    45
    
    Backspace (8S)
    45
    
    Carriage Return (CR)
    45
    
    Horizontal Tabbing (HT, ESC 1, ESC 2, ESC HT)
    45
    
    Graphics (ESC 3, ESC 4)
    46
    
    Forward/Backward Print (ESC 5/ESC 6)
    46
    
    Margins (ESC 9, ESC 0)
    47
  - Control of Platen (Paper) Movement
    47
    
    Form Feed (FF)
    47
    
    Graphics (ESC 3, ESC 4)
    47
    
    Vertical Tabbing (ESC VT)
    47
  - Other Control Functions
    48
- Sound Audible Alarm (BEL)
  48
- Preventing Buffer Overrun (ACK, ETX, NUL, DEL)
  48
Motion Minimization
48
Section 4 - Interface
49
Introduction
49
Modem Compatibility
49
Functional Description
49
I Nterface Signals
50
Interface Signal Terminology
51
Connection to the Modem
51
Signal Levels
51
Interface Signals
51
Data Format
52
Interface Data Timing
53
Timing
53
Jumper Location
58
Jumper/Shorting Plug Location
59
46-Key Typewriter Pairing Keyboard
62

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