Wyse WY-60 User manual

WY-60
Maintenance
Manual
For Service Manuals
MAURITRON SERVICES
8Cherry Tree Road, Chinnor
Oxfordshire,
OX9 4QY.
Tel [phone]
Fax [phone]
email:[email protected]
WYSE
- ... -

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

INSTALLATION, OPERATION, AND CARE
Some problems you may see can be caused when users don't install,
operate, or care for the terminal correctly. The following
paragraphs are a quick overview discussing correct installation,
operation, and care.
Installation
Correct installation meets the following requirements:
o Terminal rests on a horizontal, vibration-free surface.
o Screen avoids direct sunlight.
o Room lighting is not abnormally bright.
o Terminal is located away from strong magnetic fields.
o Room temperature never exceeds 45 degrees Celsius (113
degrees F).
o
Terminal location allows three inches clearance around and
above t he term inal.
o Keyboard is correctly connected in keyboard socket.
o RS-232C communication'cable is correctly connected to
the terminal and the computer.
o Power cord is correctly connected to the terminal and a
power source.
Figure 1-2 shows the correct terminal connections.
Figure 1-2 Terminal Installed
Power Cord
1-4

Operation
Two areas of operation are important to understand: user
con trols and setup.
User controls--Figure 1-3 shows three user controls: the power
switch, brightness slideswitch, and the keyboard.
Figure 1-3 User Controls
Brightness Slideswitch
~
Keyboard .-------i
Power Switch
The power switch is on the right side of the terminal. Pressing
the back of the switch turns AC power on.
The brightness slideswitch is located on the lower-right corner
of the front bezel. Sliding the switch to the right increases
the display brightness; sliding it to the left decreases the
brightness.
Plugging the keyboard cable connector into the keyboard connector
jack on the left side of the terminal enables the user to control
the display with the keyboard.
SetUp--When a user turns the power on, the terminal executes an
internal self-test. When the self-test finishes and the CRT is
warm (approximately 30 seconds), the cursor appears in the upper
left-hand corner of the display. The user can operate the
terminal or enter setup mode to change certain operating values
based on the parameters controlled in setup.
To check the parameters, press both the SHIFT and SETUP keys.
The first level of parameters appears across the bottom of the
screen. To examine the other parameter menus, press function
keys F1 through F10. Each time you press a different key, you
can see a different menu.
1-5

To change the parameters, follow these steps:
1. Enter setup mode by pressing the SHIFT and SETUP keys.
(Press the SHIFT and SYS REQ keys on the AT-style keyboard.)
2. Press one of the designated function keys (F1 through F10).
The menu assigned to that function key will appear on the
screen.
3. Press the cursor keys until the specific parameter to be
changed is highlighted.
4. Press the SPACEBAR to advance the parameter to the specific
setting desired.
5. Press the cursor keys as required to advance to the next
parameter to be changed.
6. To leave setup mode, either press the SHIFT and SETUP keys
or the F10 key. In all levels other than the top setup
level, you must press these keys twice.
The terminal is now operational using the parameters defined in
the setup mode.
See the ~Y-60 User's Guide for more comprehensive setup
instructions.
CARE
You may find that the terminal needs to be cleaned when you've
finish servicing it. The screen should be cleaned with a soft,
lint-free cloth. Apply a safe cleaner to the cloth, not directly
to the screen.
Caution--Don't ever clean the screen with chemical substances,
abrasives, or commercial glass cleaners that contain alcohol.
1-6

2 REMOVAL AND REPLACEMENT PROCEDURES
Overview 2-1
Safety 2-2
Required Tools 2-3
Removing and Replacing Assemblies in the
Keyboard Modules 2-3
ASCII Keyboard Replacement 2-4
ASCII Keyboard Cable Replacement 2-5
ASCII Keyboard PCB Replacement 2-6
316X- and AT-Style Keyboard Replacement 2-7
316X- and AT-Style Keyboard Cable Replacement 2-7
316X- and AT-Style Keyboard PCB Replacement 2-7
Removing and Replacing Assemblies in the
Terminal Module 2-9
Remov ing the Terminal Enclosure 2-9
Replacing the Fuse 2-10
Removinng and Replacing the Terminal PCB 2-11
Removing and Replacing the CRT/Yoke Assembly 2-13
Remov ing and Replac ing the Yoke 2-15
Replacing the Terminal Enclosure 2-16
Discharging the Anode 2-16
OVERVIEW
This chapter explains how to remove and replace assemblies and
components in both terminal modules. For purposes of
orientation, "front" is the monitor face, and "back" is the rear
panel and power cord location.
The terminal consists of two major modules (see Figure 2-1):
o
o
Terminal
Keyboard
The terminal module includes the CRT/yoke
assembly and the terminal PCB. The terminal
PCB holds all control logic, power supply
circuitry, and the circuitry to amplify and
display horizontal, vertical, and video
signals on the CRT screen.
The keyboard module includes the keyboard PCB
and the keyboard cable.
2-1

Figure 2-1 Terminal Modules
Safety
Warning--This termin~l contains high voltage. Don't attempt to
service the terminal without taking all the precautions necessary
to work with high voltage, including the following:
o If you must open the terminal for any reason, turn off the
power, disconnect any communications cables, and unplug the
terminal.
o Remove any jewelry, especially on hands and wrists.
o Avoid wearing clothing that holds a static charge.
oUse only insulated or nonconductive tools.
o Whenever you disconnect the anode lead from the anode,
make sure to ground the anode as directed in "Discharging
the Anode."
o If you need to remove or replace the CRT/yoke assembly,
remember that it can implode if you drop it or break the
neck. The flying glass can injure anyone within a radius of
six to ten feet.
2-2

Required Tools
Before you remove or replace any assemblies in the terminal, make
sure you have the tools and materials listed below.
oNo. 0 Phillips screwdriver
oNo. 2 Phillips screwdriver
o Insulated flat-blade screwdriver
o Alligator clips
o Digital multimeter (or voltmeter)
o Nonscratch mat or surface
o Fuse puller or small flat-blade screwdriver
REMOVING AND REPLACING ASSEMBLIES IN THE KEYBOARD MODULES
The terminal has three keyboard options: the WY-60 ASCII
keyboard, the 316X-style keyboard, and the AT-style keyboard. See
Figure 2-2 if you need to identify your keyboard. Removal and
replacement instructions for the ASCII keyboard are first,
followed by another set of instructions for the other keyboard
styles. Each set of instructions describes procedures to remove
and replace the keyboard, keyboard cable, and keyboard PCB.
Figure 2-2 Keyboard Styles
WY-60 ASCII Keyboard Layout
2-3

3161X-Style Keyboard Layout
AT-Style Keyboard Layout
-
C<1PS L0C~ Num Loc~ S('o" l"clo..
ASCII Keyboard Replacement
Tools required: None
Follow these steps to replace the keyboard (see Figure 2-3):
1. Turn the terminal off.
2. Press the keyboard cable connector tab and pull the keyboard
cable out of the keyboard socket on the side of the
terminal.
3. Plug the new keyboard into the terminal keyboard socket.
2-4

Figure 2-3 ASCII Keyboard Assembly
Top Cover
ASCII Keyboard Cable Replacement
Tools required:
o No.2 Phillips screwdriver
For Service Menue'e
MAURITRON SERVICES
8Cherry Tree Roed, Chlnnor
Oxford.hlre, OX9 4QY.
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emall:[email protected]
To replace the keyboard cable (see Figure 2-3):
1. Turn the terminal off.
2. Press the keyboard cable connector tab and pull the cable
out of the keyboard socket on the side of the terminal.
3. Unscrew the four Phillips screws on the bottom of the
keyboard. Remove the bottom cover.
4. Unscrew the two Phillips screws on the bottom of the exposed
keyboard PCB, holding the PCB to the top cover.
2-5

5.
Lift the keyboard PCB out of the top cover.
Turn it over.
6. Disconnect the keyboard cable from the keyboard cable
conn ec tor on the PCB.
7. Connect the new keyboard cable at the keyboard cable
connector on the keyboard PCB.
8. Fit the keyboard PCB into the top cover, making sure to
fit the keyboard cable into its special slot. Replace the
screws that secure the PCB to the top cover.
9. Replace the bottom cover and screws.
10. Plug the free end of the keyboard cable into the terminal
keyboard socket.
ASCII Keyboard PCB Replacement
Tools required:
o No.2 Phillips screwdriver
To replace the keyboard PCB (see Figure 2-3):
1. Turn the terminal off.
2. Press the keyboard cable connector tab and pull the keyboard
cable out of the keyboard socket on the side of the
terminal.
3. Unscrew the four Phillips screws on the bottom of the
keyboard. Remove the bottom cover.
4. Unscrew the two Phillips screws on the bottom of the exposed
keyboard PCB, holding the PCB to the top cover.
5. Lift the keyboard PCB out of the top cover. Turn it over.
6. Disconnect the keyboard cable connector Jl from the keyboard
PCB.
7.
Reconnect the keyboard cable connector at Jl on the new
keyboard PCB.
8. Fi t the keyboard PCB into the top cover, making sure to fi t
the keyboard cable into its special slot. Replace the
screws that secure the PCB to the top cover.
9. Replace the bottom cover and screws.
10. Plug the free end of the keyboard cable into the terminal
ke yboa rd soc ket.
2-6

316X- and AT-Style Keyboard Replacement
Tools required:
None
To replace the keyboard (see Figure 2-4), follow these steps:
1. Turn off the terminal.
2. Press the keyboard cable connector tab and pull the keyboard
cable out of the keyboard.
3. Plug the keyboard cable into the new keyboard's connector.
316X- and AT-Style Keyboard Cable Replacement
Tools required: None
To replace the keyboard cable (see Figure 2-4), follow these
s te ps :
1. Turn the terminal off.
2. Press the keyboard cable connector tab and pull the keyboard
cable out of the keyboard.
3. Press the other keyboard cable connector tab and pull the
keyboard cable out of the left side of the terminal.
4. Insert one end of the new keyboard cable into the keyboard
connector. Insert the other end into the terminal keyboard
socket.
316X- and AT-Style Keyboard PCB Replacement
Tools required:
oNo. 0 Phillips screwdriver
o No.2 Phillips screwdriver
To replace the keyboard PCB (see Figure 2-4), follow these steps:
1. Turn off the terminal.
2. Unpl ug the keyboard cable from the keyboard.
3. Turn the keyboard over and remove the six No.2 Phillips
screws that attach the keyboard bottom cover to the
keyboard.
4. Lift off the keyboard bottom cover.
2-7