Wyse WY-60 User manual

WY-60
Maintenance
Manual
For Service Manuals
MAURITRON SERVICES
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Oxfordshire,
OX9 4QY.
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OVERVIEW
This maintenance manual contains information on how to service
and repair the WY-60 terminal. We assume you are a qualified
service technician with previous experience in terminal and
computer repair. To take full advantage of this manual, we
suggest you read the information in the order presented.
HOW TO USE THIS MANUAL
This manual is divided into seven chapters and four appendixes.
The first chapter provides important information for the
technician who has never serviced this terminal before. If you
are already familiar with the terminal, the technical information
in Appendix A can remind you about the terminal.
Here is a summary of this manual:
Chapter 1, wGeneral Information," describes the terminal,
including information about internal functions, input/output
(I/O), telecommunications, environmental needs, and operator
controls.
Chapter 2, "Removal and Replacement Procedures," shows you how to
take the terminal apart and put it back together again.
Chapter 3, wTroubleshooting," tells you what to look for and how
to fix problems with the terminal. It includes a list of tools
needed for troubleshooting, a quick reference guide, and a
flowchart.
Chapter 4, "Adjustments and Alignments," describes power supply
and monitor adjustments that control the quality of the display.
Chapter 5, "Illustrated Parts List," includes a list of display
and keyboard assembly parts.
Chapter 6, "Theory of Operations," describes the terminal
operation by function.
Chapter 1, "Schematics and PCB Assembly Drawings," contains
schematic representations of all the terminal's circuits.
iii

Appendix A, "Specifications," lists the terminal's
specifications.
Appendix B, "Connector Pin Assignments," lists the signals on
each pin of the MODEM and the AUX ports located on the rear panel
of the terminal.
Appendix C, "Test Connectors," describes how to make diagnostic
hood test connectors.
Appendix D, "Display Inspection With the Reticle," describes how
to check the terminal's display with a special tool, the reticle.
REFERENCE MANUALS
The following publications provide additional information about
the terminal:
~Y-60 User's Guide, Document 880259-02
~Y-60 Programmer's Guide, Document 880261-01
iv

TABLE OF CONTENTS
OVERVIEW iii
1 GENERAL INFORMATION
Introduction 1-1
High Level Functional Description 1-2
Microcontroller 1-2
Memory ••••••••••••••••.••••••••••••••.••••••••••••••••••.•• 1-2
Terminal Control 1-3
Input/Output Devices 1-3
Installation, Operation, and Care 1-4
2 REMOVAL AND REPLACEMENT PROCEDURES
Overview
Remov ing
Keyboard
Remov ing
Terminal
...................................................
and Replacing Assemblies in the
Modules .
and Replacing Assemblies in the
Module .
2-1
2-3
2-9
3 TROUBLESHOOTING
Before You Start 3-1
Primary Troubleshooting Proced ures 3-2
Troubleshooting Quick Reference Guide 3-4
Troubleshooting Flowchart 3-5
Additional Troubleshooting Procedures 3-12
4 ADJUSTMENTS AND ALIGNMENTS
Before You St3.rt 4-1
Checking Display Specifications 4-2
Aligning the Termin3.l Display 4-5
Adjusting the Terminal Display 4-10
Test Patterns 4=15
v

5ILLUSTRATED PARTS LIST
Introduction 5-1
Printed Circuit Board Layout and Component
Identification 5-2
Terminal Display Assembly Exploded View 5-3
Keyboard Assemblies Exploded Views 5-4
Terminal PCB Components List 5-6
Terminal Board Assembly Layout 5-13
WY-60 Full-Touch Keyboard PCB Components List 5-14
WY-60 Full-Touch Keyboard PCB Layout 5-14
316X-Style Keyboard PCB Components List 5-17
316X-Style Keyboard PCB Layout .. : 5-17
AT-Style Keyboard PCB Components List 5-17
AT-Style Keyboard PCB Layout 5-17
Diagnostic Tools 5-20
6 THEORY OF OPERATIONS
Terminal PCB Logic Components Functional Description 6-1
Monitor/Power Supply Components Functional Description 6-6
Keyboard 6-8
Additional Functional Descriptions 6-9
Raster Scan Terminology 6-13
7SCHEMATICS AND PCB ASSEMBLY DRAWINGS
Keyboard PCB Schematic, WY-60 ASCII 7-3
Keyboard PCB Schematic, AT-Style 7-5
Keyboard PCB Schematic, 316X-Style 7-7
Terminal PCB Schematic, Logic 7-9
Terminal PCB Schematic, Monitor/Power Supply 7-13
Keyboard PCB Assembly Drawing, WY-60 ASCII 7-15
Keyboard PCB Assembly Drawing, AT-Style 7-17
Keyboard PCB Assembly Drawing, 316X-Style 7-19
Terminal PCB Assembly Drawing 7-21
APPENDIXES
A
Specifications ··· A-1
B Connector Pin Assignments B-1
C
Test Connectors :C-1
D
Display Inspection with the Reticle D-1
INDEX 1-1
vi

LIST OF FIGURES
1 -1
1-2
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2 -11
3-1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
5-1
5-2
5-3
5-4
5-5
5-6
5-7
6-1
6-2
6-3
7-1
7-2
7 -3
7 -4
7-4
7-5
7 -6
7-7
7-8
Terminal Installed 1-4
User Controls 1-5
Terminal Modules 2-2
Keyboard Styles 2-3
ASC II Keyboard Assembl y 2-5
316X- and AT-Style Keyboard Assembly 2-8
Removing the Terminal Enclosure 2-9
Replacing the Fuse 2-10
Removing the Terminal PCB 2-12
Removing the CRT/Yoke Assembly 2-14
Replacing the Yoke 2-15
Discharging the Anode Before Removal 2-17
Discharging the Anode Before Installation 2-18
Troubleshooting Flowchart 3-6
Power Supply Component Layout 4-8
Adj us tmen t Loca t ions 4 -10
Yoke Lock on the CRT Neck 4-12
Centering Rings ·. 4-13
Display Magnets 4-13
Pattern M 4-15
Pattern 0 4-16
Sample PCB 5-2
Terminal Display Assembly Exploded View 5-3
Keyboard Assemblies Exploded Views 5-4
Terminal Board Assembly Layout 5-14
WY-60 ASCII Keyboard PCB Layout 5-16
316X-Style Keyboard PCB Layout 5-18
AT-Style Keyboard PCB Layout 5-20
Terminal PCB Logic Circuitry Functional
Block Diagram 6-2
Monitor/Power Supply Circuitry Functional
Block Diagram 6-7
Keyboard Block Diagram 6-8
WY-60 ASCII Keyboard PCB Schematic 7-3
AT-Style Keyboard PCB Schematic 7-5
316X-Style Keyboard PCB Schematic 7-7
Terminal PCB Schematic (Logic) 7-9
Terminal PCB Schematic (Monitor/Power Supply) 7-13
WY-60 ASCII Keyboard PCB Assembly Drawing 7-15
AT-Style Keyboard PCB Assembly Drawing 7-16
316X-Style Keyboard PCB Assembly Drawing 7-17
Terminal PCB Logic Assembly Drawing 7-18
vii

• ~ ... ··,· .. ·o:D"'¥"~' ... ; .... ··_--·- I.J.f .. Oi~'tt:'Ior1wiA ... ,....._..
LIST OF FIGURES, Continued
B-1
Pin Numbers (MODEM and AUX Ports)
.....................
B-1
D-1 Video Inspection Reticle D-1
D-2
Checking Width and Height .. ;D-3
D-3 Checking Straightness, Pincushioning,
Centering, and Vertical Linearity D-4
LIST OF TABLES
3-1 Module Level Troubleshooting Quick
Reference Guide 3-5
3-2 Terminal Installation Checklist 3-13
3-3 Terminal PCB Circuit Isolation Jumpers 3-16
4-1 Display Problems and Their Adjustments 4-9
4-2 Screen Areas Affected by Display Magnets 4-14
5-1 Reference Designator Letters 5-2
5-2 Terminal PCB Components List 5-7
5-3 WY-60 ASCII Keyboard PCB Components List 5-15
5-4 316X-Style Keyboard PCB Components List 5-17
5-5 AT-Style Keyboard PCB Components List 5-19
5-6 Diagnostic Self-Test Connectors 5-21
6-1 Clock Rates 6-4
6-2 8051 Port Assignments 6-9
B-1 MODEM Port Connector Pin Assignments (DTE) B-1
B-2 Typical Modem Pin Assignments B-2
B-3 AUX Port Connector Pin Assignments (DCE) B-2
viii

1 GENERAL INFORMATION
Introduction 1-1
High Level Functional Description 1-2
Microcontroller 1-2
Memory 1-2
Terminal Control 1-3
Input/Output Devices 1-3
CRT Display 1-3
Communications Interfaces 1-3
Keyboard 1-3
Installation, Operation, and Care 1-4
Installation 1-4
Opera t ion 1-5
Care 1-6
INTRODUCTION
This versatile, full-function ASCII terminal includes the
following features:
o Choice of three different keyboRrds
o Up to seven pages of display memory
o Choice of 26- or 44-line by 80- or 132-column display, with
split screen capability and selectable status lines
o Hidden character display attributes that can be combined
with double-high/double-wide line attributes; nonhidden
attribute modes
o Seven predefined character sets and 512 user-definable
characters
o Fifteen operating modes with personalities characteristic of
other terminals, including PC and PC/AT terminal modes
o Bidirectional, interchangeable communications interfaces
1-1

o WyseWorks desktop accessories
o Wyseword WordStar key definitions
The terminal consists of a display console and a detachable
keyboard. A user enters information for display from the
keyboard. The terminal contains all of the electronics that
support the display and keyboard.
In addition to the cathode ray tube (CRT) and keyboard, the
terminal contains two independent communications interfaces.
Peripherals, including a hard-copy printer or plotter, can be
attached to the terminal through the interface connectors on the
rear panel.
The component parts are organized around and controlled by the
microcontroller. The microco~troller controls all internal data
manipulation and processing functions.
HIGH LEVEL FUNCTIONAL DESCRIPTION
The terminal consists of a microcontroller and related logic, a
CRT controller and associated control logic, a gate array,
input/output (I/O) devices, monitor and power supply circuitry,
and a CRT. All circuitry is mounted on a single printed
circui t board (PCB), the terminal PCB. The microcontroller
controls all basic functions.
MICROCONTROLLER
The heart of the terminal, the 8051 microcontroller, is an 8-bit,
single-component microcontroller that has 128 bytes of random
access memory (RAM), 32 I/O lines, three 16-bit counter/timers, a
full-duplex universal asynchronous receiver/transmitter (UART),
and integral interrupt and clock circuitry.
MEMORY
The terminal memory consists of EEPROM, RAM, EPROM, and ROM. The
terminal EEPROM is the X2404, which stores all user selected
setup parameters. Terminal RAM includes the Character RAM, the
Attribute RAM, and the Font RAM. In hidden attribute mode, the
Character RAM holds a character for each character cellon the
screen. The Attribute RAM holds an attribute for each character
cellon the screen. The Font RAM holds four predefined character
sets and that may include additional user-defined characters.
Terminal ROM includes the Code ROM, which holds the program code
that operates the terminal, and the ROM internal to the 8051 that
supports the Code ROM.
1-2

TERMINAL CONTROL
Terminal control components include the 8051 microcontroller
described above and the 2672 programmmable video timing
controller (PVTC). The 2672 controls vertical and horizontal
timing, consecutive addressing for the display memory, the
microcontroller-display buffer interface, and consecutive
addressing of row buffers. The PVCT controller reads displayed
characters and attributes from their respective RAMs on a DMA
basis, sending this information to the gate array. The gate
array generates the video signals that control the display.
Functions of the terminal firmware include keyboard scanning,
programming the video controller, data transfer to and from the
communication ports, and data manipulation.
INPUT/OUTPUT DEVICES
I/O devices consist of a CRT display, two communications
interfaces, and a keyboard.
CRT Display
The terminal has a 14-inch, flat-screen CRT. It displays 26 or
44 rows of characters and 80 or 132 columns. Available phosphor
colors for the CRT include green, amber, and white.
Communications Interfaces
The terminal has two asynchronous serial interfaces that conform
with the EIA standard RS-232C. Data rates are set independently
for both interfaces. These parameters are operator controlled
and are defined in "Setup Parameters" in the User's Guide. The
MODEM interface can communicate at data rates up to 38.4K bits
per second (bps). The AUX interface can communicate at data
rates up to 19.2K bps.
Keyboard
The terminal is available with three keyboards: the WY-60 ASCII
keyboard, an 316X-style keyboard, and an AT-style keyboard. Each
has a standard four-wire interface with the terminal. All keys
are momentary action key switches. The microprocessor
periodically scans the keys, checking for key closures.
Figure 2-2 in Chapter 2 shows the keyboards. You can find
add it ional in fo rm a tion ab out the ke yboard s in Cha pte r 6, "Theo ry
of Operations" and Chapter 7, "Schematics." .
1- 3