Sun Microsystems 360-1000-02 User manual

Pa.rt Number 800-1147-01
Revision: 50 of 7 January 1985
Moniterm Monitor (P /N 360-1000-02)
· Service Manual
for the
Sun-2 Family of Workstations
Sun Microsystems, Inc.,
2550 Garcia Avenue,
Mountain View,
California 94043
[phone]

Credits and trademarks
Sun Workstation, Sun-1, Sun-2,
SunStation, and Sun Microsyatema are
trademarks of Sun Microsystems, Incorporated.
UNIX is a registered trademark of Bell La.bora.tories.
Copyright C 1985 by Sun Microsystems, Inc.
This publication is protected by Federal Copyright Law, with all rights reserved. No pa.rt of this
publication may be reproduced, stored in a retrieval system, translated, transcribed, or transmit-
·-cd, in any form, or by any means manual, electric, electronic, electro-magnetic, mechanical,
chemical, optical, or otherwise, without prior explicit written permission from Sun Microsystems.
- ll -

Revision History
Revision
Date
Comment•
50
7 January 1985 First release of this Service Manual.
- iii -

Contents
Introduction ................................................................................................................................................. xi
Chapter 1 Sun-2 Moniterm Monitor ....................................................................................... 1-1
1.1. Goa.ls and Objectives........................................................................................................... 1-1
1.2. Safety Precautions................................................................................................................. 1-1
1.3. Monitor Description.............................................................................................................. 1-1
1.3.1. Horizontal Sync Signal............................................................................................. 1-4
1.3.2. Vertical Sync Signal .................................................................................................. 1-4
1.4. Monitor Signals ........................................................................................................................ 1-4
1.5. Picture Tube ............................................................................................................................. 1-8
1.6. Setting for the Correct Input Voltage ...................................................................... 1-9
1.6.1. 120/240 VAC Operation ......................................................................................... 1-10
1.6.2. 100/220 VAC Operation ......................................................................................... 1-11
1.7. AC Input Ratings ................................................................................................................... 1-12
1.8. Fuse Rating ........................................................................................................................... ..... 1-12
1.9. Operating Specifications .................................................................................................... 1-12
Chapter I Troubleshooting the Sun-2 Moniterm Monitor........................................ 1-1
2.1. Explanation of the Troubleshooting Flowchart .................................................. 2-2
2.1.1. Node and Off-Page Connectors .......................................................................... 2-2
2.1.2. Decision Boxes ............................................................................................................... 2-3
2.1.3. Asterisks .... :....................................................................................................................... 2-3
2.1.4. Checking Line Voltage ............................................................................................. 2-3
2.2. Notes to Troubleshooting ................................................................................................. 2-17
Chapter I How to Adjust the Moniterm Monitor .......................................................... 3-1
3.1. Tools Needed for Adjusting/Repairing the Monitor....................................... 3-1
3.2. Getting Inside the Monitor .............................................................................................. 3-2
3.3. Removing the Deflection Board .................................................................................... 3-4
3.4. Removing the Neck Board ............................................................................................... 3-4
3.5. Removing the Video Cable .............................................................................................. 3-5
3.6. Removing the Remote Brightness Potentiometer ............................................. 3-5
3.7. Putting the Monitor Back Together.......................................................................... 3-5
3.8. Adjustments to the Moniterm Monitor .................................................................... 3-6
3.8.1. Neck Board Adjustment ......................................................................................... 3-6
3.8.1.1. Brightne~ Adjustment: Pot R9 .............................................................. 3-6
3.8.2. Adjustment Potentiometers on the Deflection Board .......................... 3-6
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Chapter 4 Test Procedure for the Moniterm Monitor ................................................ 4-1
4.1. Applicable Documents......................................................................................................... 4-1
4.2. Definitions ................................................................................................................................... 4-1
4.3. Test Set-up ................................................................................................................................. 4-1
4.3.1. Test Configuration ...................................................................................................... 4-1
4.4. Test Procedure ........................................................................................................................ 4-2
4.4.1. High Voltage Adjustment ....................................................................................... · 4-2
4.4.2. Contrast Adjustment ................................................................................................ 4-3
4.4.3. Geometry Adjustment ............................................................................................. 4-3
4.4.4. Vertical Linearity Adjustment ........................................................................... 4-3
4.4.5. Brightness Adjustment ............................................................................................ 4-4
4.4.6. Pincushion and Barrel Distortion Check...................................................... 4-4
4.4.7. Ringing Test ................................................................................................................... 4-4
Appendix A Parts, Schematics and Component Locations...................................... A-1
-VI -

Tables
Table 1 Additional Documentation ............................................................................................. x1
Table 1-1 Two Configurations of the Moniterm Monitor Display ... ,,,,,,,,,,,,,,,,,,,,,,,, 1-2
Table 1-2 Visible and Invisible Lines in Configuration A ............................................. 1-2
Ta.hie 1-3 Visible and Invisible Lines in Configuration B ............................................. 1-2
Table 1-4 Timing Specifications for Display A and Display B Video
Images..................................................................................................................................... 1-4
Table 1-5 Voltage Levels for ECL and TIL Video Logic............................................ 1·6
Table 1-6 Maximum Ratings for AC Supply Voltage ...................................................... 1-12
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Figures
Figure 1-1 The Sync Signals: Visible and Invisible Parts of Waveform.............. 1-3
Figure 1-2 Front Porch, Ba.ck Porch and Sync Portions of the Blanking
Signal ..................................................................................................................................... 1-3
Figure 1-3 Monitor Block Diagram, Part 1 ............................................................................ 1-5
Figure 1-4 TIL/ECL Video Jumper.......................................................................................... 1-6
Figure 1-5 Horizontal and Vertical Sync Signals on the Deflection Board........ 1-7
Figure 1-6 Monitor Block Dia.gram, Part 2 ·················································---------- 1-7
Figure 1-7 Low and High Voltage Power Supplies............................................................ 1-8
Figure 1-8 AC Power, Voltage Select, and Fuse ................................................................ 1-9
Figure 1-9 120/240 VAC Select ..................................................................................................... 1-10
Figure 1-10 100/220 VAC Select .................................................................................................. 1-11
Figure 2-1 Connector, Low Voltage Power Supply .......................................................... 2-17
Figure 3-1 Removing the Chassis Cover .................................................................................. 3-2
Figure 3-2 Removing the Perforated Metal Cover ........................................................... 3-3
Figure 3-3 Video Geometry Alignment Fixture (VGAF) .............................................. 3-9
Figure 3-4 Adjustment Potentiometers on the Deflection Board ............................ 3-10
Figure 4-1 What Ringing Looks Like ......................................................................................... 4-5
Figure A-1 Major Subassemblies of the Monitor................................................................ A-2
Figure A-2 Grounding Strap Locations: Deftection and Neck Boards ................. A-3
Figure A-3 Deflection Board Component Locations ......................................................... A-4
Figure A-4 Neck Board Component Locations ............................ , .......... ____ ..................... A-5
Figure A-5 Deflection Board Schematic ................................................................................... A-6
Figure A-6 Neck Board Schematic .............................................................................................. A-7
- lX-

Introduction
This manual is meant to help you understand how to troubleshoot, repair, and adjust the Sun-2
Moniterm monitor.
Summ&l"J of Content•
This manual has four major sections.
Chapter 1 - is a block-level description of the Moniterm monitor's circuitry.
Chapter 2 - describes the troubleshooting procedures.
Chapter 3 - describes the adjustment procedures.
Chapter 4 -describes the test procedures.
Appendix A - contains an illustrated parts' breakdown of the monitor suba.ssernblies, and the
Neck and Deflection board schematics and component locations.
Finally, to help us maintain the currency and accuracy of this material we have supplied a
reader comment sheet at the end of this guide. Please use the comment sheet to list errors and
om1ss1ons. Your responses will help a great deal in our efforts to keep our documentation up to
date.
Table 1: Additional Documentation
Part Number De1cription
950-0001 Engineering Specification for the 19 inch Monochrome Monitor
Revision 50 of 7 January 1985
xi

Chapter 1
Sun-2 Moniterm Monitor
1.1. Goals and Objectives
The purpose of this manual is to present a theory of operations, a troubleshooting guide, and an
alignment procedure for repair of the Sun-2 Moniterm monitor.
1.2. Safety Precautions
Warning
To avoid electric shock and/or a fire hazard, DO NOT REMOVE
COVERS. Ref er all servicing to qualified service personnel.
1.3. Monitor Description
Caution!
There are extremely high voltages present in 1ome of thia circuitry, particularly the
output of the high voltage 1uppl7 and the anode connection to the CRT. Make cer-
tain all power to the monitor la OFF before attempting any repalra.
The Sun-2 Moniterm monitor is a non-interlaced raster display which in its standard
configuration has a 1152 (horizontal) by 900 (vertical) display, with a 100 MHz video pixel rate.
An alternate configuration is the lK x lK (1024 by 1024) display. For convenience, these two
configurations will be known a.s "A" and "B" (see the table below).
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Sun-2 Moniterm Monitor Sun-2/120 Video Monitor Service Manual
Table 1-1: Two Configurations of the Moniterm Monitor Display
Configuration Name Configuration Size
A
1152 by 900 pixels
B 1024 by 1024 pixels
The monitor has separate low active TTL-level horizontal and vertical sync signals. Frame rates
are listed in the timing specification table, below.
The actual number of visible lines (that time when information is being painted on the screen)
and invisible lines (that time when information is blanked during retrace) in the standard and
optional configurations are given in the two tables below. For instance Configuration A has a
total of 1600 horizontal lines, of which 1152 a.re visible. This means that 448 lines are blanked
during retrace time.
Ta.hie 1-2: Visible and Invisible Lines in Configuration A
Total Lines lnvlalble
Line. Visible Line.
Horizontal trace 1600
448 1152
Vertical trace 937 37
900
Table 1-3: Visible and Invisible Lines in Configuration B
Total Line. Invisible Line.
Y•lbleLlnm
Horizontal trace 1600
576 1024
Vertie.I trace 1061
37 1024
Below is a general diagram of the portions of the sync waveform which determine the visible
and invisible (blanked) lines of the display. By "general" we mean that no timing relationships
should be _inf erred from this diagram.
nr.,~i~ion 50 of 7 January 1985
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Sun-2/120 Video Monitor Service Manual Sun-2 Moniterm Monitor
Figure 1-1: The Sync Signals: Visible and Invisible Parts of Waveform
The figure below depicts three parts of the blanking portion of the sync waveform:
• front porch
• sync
• back porch
Figure 1-2: Front Porch, Back Porch and Sync Portions of the Blanking Signal
..... , ..... .
I
I
I
I
I
I
I
I
I
front porclt
IJl'IC
..... , ..... .
I
I
I
I
I
I
I
I
I
6eci porclt
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Sun-2 Moniterm Monitor Sun-2/120 Video Monitor Service Manual
The table below gives the timing specifications for the two display configurations.
Table 1-4: Timing Specifications for Display A and Display B Video Images
Parameter Confl.Iuration A
Conft•uration B
Vitleo clock 100.00 MHz
100.00 MHz
Horizontal l!eJLuencJL
62.50 kHz 62.50 kHz
Horizontal 1pc
Acrck 16.00
µ.s
16.00 ps
f1i1ible
11.52 p.s
10.24 p.s
lblonking 4.48 µ.s 5.76 ps
front pore/a
0.00 p.s 0.64 p.s
l1pcl 1.28 p.s
1.28 ps .
6tJc1' l!_orclt
3.20 ps 3.84 ps
Vertical 111nc
vc11cle
14992.00 p.s
16976.00 p.s
viaible 14400.00 p.s
16384.00 µ.s
vblanking 592.00 µs 592.00
p.s
front porcA 00.00 p.s 00.00 µ.s
t111/f1C
128.00 µ.s
128.00 p.s
back _l!_orclt 432.00 p,s
432.00 JJS
Vertical JreJLuencJL
66.70 Hz
58.91 Hz
1.8.1. Hon"zontal Srnc Signal
The horizontal sync signals of both configurations have a frequency of 62.5 kHz, which is a
period of 16 p.s. · Each 16 p.s period consists of visible (that time when information is being
painted on the screen) and invisible (the time when the signal is in retrace) parts of the cycle.
For instance, the visible portion of the horizontal sync signal for Configuration B lasts for 10.24
ps; the invisible 5.76 p.s. These two added together make up the 16 ps period of the horizontal
sync signal.
1.8.t. Vertical Sync Signal
Configuration A's vertical sync signal has a frequency of 66.7 Hz, which is a period of 14.992 ms.
Configuration B's vertical sync signal has a frequency of 58.91 Hz, which is a period of 16.976 ms.
Both have visible a.nd invisible portions, on the same principle as the horizontal sync signal.
· 1.4. Monitor Signals
A block dia.gram of the sign a.I flow is given below -for further detail, ref er to schema.tics of the
Neck and Deflection boards in the Appendix.
Basically, three signals come in on the video connector a.t the rear of the monitor chassis
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Sun-2/120 Video Monitor Service Manual Sun-2 Moniterm Monitor
• video
• horizontal sync
• vertical sync
Figure 1-3: Monitor Block Diagram, Pa.rt 1
I I
(11}
' '
{It)
Video ~
conneclor
Horizontal J!l-161
(Jt-t)
Horizontal Sync (Pin Gl
--
Connector
Vertical
(11-18}_
Neck Vertical Sync (Pin FL
Deft~tlon
(rear of
(Jt-1)
-
Board
-Bc+r'd
monitor)
L----•
I
'
~-----'
'
'
'
Video J!P-1-ll
~-----'
-
to Cathode
~
These three signals pass onto the Neck board through Jl. The horlsontal a.nd vertical sync
signals pass through inverters and are taken of the board at J2. The video signal passes
through various circuitry (depending upon whether the signal is TTL or ECL) and is taken of
the board at Pl-7 to the cathode of the CRT. The diagram below illustrates the jumpering of
JP3, the TTL/ECL Video Jumper, in which:
• connecting pins 1 and 4 will give you TTL video
• connecting pins 2 a.nd 3 will give you ECL video.
Hevision 50 of T January 1985
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•

Sun-2 Moniterm Monitor Sun-2/120 Video Monitor Service Manual
Figure 1-4: TTL/ECL Video Jumper
JP3
TTL-level Vitleo ©
---------4 1
©~--
ECL-let1el Vi'eo ©
-------2
@~--
Voltage level requirements for ITL and ECL signals are listed in the table below.
Table 1-5: Voltage Levels for ECL and ITL Video Logic
Input Signt1I
Logic 0 Logic 1
TI'L Video <0.4 VDC >2.4 VDC
Horisontal 87nc <0.4 VDC >2.4 VDC
Vertical 87nc
<0.4 VDC >2.4 VDC
ECLVldeo
differential >0.5 VDC
The two sync signals are passed to the Deftection board through pin G (horizontal sync) and pin
F (vertical sync) of the Video connector -see the schematic for the Deftection board in the
Appendix. These deftection signals pass through their respective deftection yokes.
· · 1n 50 of 7 January 1985
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Sun-2/120 Video Monitor Service Manual Sun-2 Moniterm Monitor
Figure 1-5: Horizontal and Vertical Sync Signals on the Deflection Board
laorizonlal 1pc in
verlicol 1pc in
r-----,
horizontal 111nc in to horizontal 11oke
Gt--~~~~~~IC3--~~~~~--
vertical 111nc in lo vertical 11oke
F1--~~~...;._~~~1cs~~~~~~~~
L-----~
Deflection board
Figure 1-6: Monitor Block Diagram, Part 2
Deflection
Board
+24V
to Vertical Yoke
to Horizontal Yoke
to Neck board
High
Voltage
Power
Supply
to anode
Also included in the Deflection board circuitry are potentiometers Pl through PU, the low vol-
tage power supply, and the high voltage power supply.
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Sun-2 Moniterm Monitor Sun-2/120 Video Monitor Service Manual
Figure 1-7: Low and High Voltage Power Supplies
Low
High voltage to anode
--
Voltage +24V Voltage
---
Power Power voltage
to focus and brightness __
Supply Supply
The 11 potentiometers on the Deflection board are:
• Pl -Horizontal Width
•
P2 -Horizontal hold
•
P3 -Vertical hold
• P4 -Vertical size
•
PS -Vertical top/bottom linearity
• P6 -Vertical linearity
• P7 -DC focus
• PS -Brightness
• P9 -Vertical DC centering
• PIO -Vertical dynamic focus
•
Pl 1 - Horizontal dynamic focus
For location of these potentiometers, see Chapter 3.
1.5. Picture Tube
The picture tube consists of these various elements:
• Cathode
• G1 - grid which controls the brightness and intensity of the screen
• G2 -grid which sets the biasing point for Gl (tube operating point)
---
• G3 -suppressor grid; narrows the electron beam and reduces secondary reflection
• G4 -focus grid
• Anode -places a charge on the inside surface of the tube (cf. •qu•'•1, below.)
• Deflection yoke -deflects the electron beam to the correct area of screen
• Aquadag -coating on the inside of the tube which stores a charge like a capacitor.
The G2 and G4 grids act like a fine mesh screen, through which electrons pass. The greater the
bias voltage which is applied to a grid, the finer the mesh appears, reducing electron &ow.
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Sun-2/120 Video Monitor Service Manual Sun-2
Moniterm Monitor
The Moniterm monitor uses both vertical and horizontal dynamic focusing to move the electron
beam anywhere on the screen. Dynamic focusing keeps the beam appearing circular, and is
a.djustabie through PIO and PU on the Deflection boa.rd, as described in Chapter 3.
1.6. Setting for the Correct Input Voltage
Voltage selection is done by setting a sma.11 PCB in one direction or another inside the "Fuse"
section of the AC input receptacle. The diagram below shows the location of the voltage select
PCB.
Figure 1-8: AC Power, Voltage Select, and Fuse
R~vi~ion 50 of 7 January 1985
AC
input
Fuse
1-9