Acer 7277e User manual

7277e Monitor
Service Guide
September 1998
Printed in Taiwan PART NO.:49.70601.271
DOC NO.:9809A-7277ESG

API Confidential
No Copy/Reproduction Allowed 7277e Monitor Service Guide
ii
Copyright
Copyright symbol 227 \f "Symbol" \s 10} 1998 by Acer Peripherals, Inc. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of Acer Peripherals, Inc.
Disclaimer
Acer Peripherals, Inc. makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranties, mechantability or fitness for any particular purpose.
Further, Acer Peripherals, Inc. reserves the right to reserve this publication and to make changes from time to time
in the contents hereof without obligation of Acer Peripherals, Inc. to notify any person of such revision or changes.

Table of Contents API Confidential
No Copy/Reproduction Allowed iii
Table of Contents
toc \o "1-3" \t "chapter title,1,subtitle 02,2,subtitle 03,3,subtitle 04,4"
Table of Contents.......................................................................................................................................................iii
1. SYSTEM OVERVIEW.......................................................................................................................................................1-1
1.1 Introduction .........................................................................................................................................................1-1
1.2 Operational Specification ....................................................................................................................................1-2
1.2.1 Environment.......................................................................................................................................1-2
1.2.1.1 Temperature.......................................................................................................................1-2
1.2.1.2 Humidity............................................................................................................................1-2
1.2.1.3 Altitude..............................................................................................................................1-2
1.2.2 Vibration.............................................................................................................................................1-2
1.2.3 Drop Test (with packing)....................................................................................................................1-2
1.2.3.1 Drop Height.......................................................................................................................1-2
1.2.3.2 Drop Sequence...................................................................................................................1-2
1.2.4 Electrostatic Discharge Requirements................................................................................................1-2
1.2.5 Safety Requirements...........................................................................................................................1-3
1.2.5.1 110V Version.....................................................................................................................1-3
1.2.5.2 220V Version.....................................................................................................................1-3
1.2.6 EMC Requirements ............................................................................................................................1-3
1.2.6.1 110V Version.....................................................................................................................1-3
1.2.6.2 220V Voltage.....................................................................................................................1-3
1.2.7 Acoustical Noise.................................................................................................................................1-3
1.2.8 Reliability...........................................................................................................................................1-3
1.3. Input/Output Specifications................................................................................................................................1-4
1.3.1 Input Signal Requirements .................................................................................................................1-4
1.3.1.1 Signal cable (Directly attached to unit) .............................................................................1-4
1.3.1.2 Video Signal......................................................................................................................1-4
1.3.1.3 SYNC Signal.....................................................................................................................1-4
1.3.1.4 Timing ...............................................................................................................................1-5
1.3.1.5 Input Signal Quality...........................................................................................................1-7
1.3.2 Power Supply Requirements...............................................................................................................1-7
1.3.2.1 Input Power Requirements ................................................................................................1-7
1.3.2.2 Output Power Requirements..............................................................................................1-8
1.3.2.3 AC Power Inlet..................................................................................................................1-8
1.3.2.4 Power Cord........................................................................................................................1-8
1.3.2.5 Power Management Function............................................................................................1-8
1.3.3 CRT Requirements.............................................................................................................................1-8
1.4 Functional Specifications.....................................................................................................................................1-9
1.4.1 Display Quality...................................................................................................................................1-9
1.4.1.1 Display Date Area (with 20 ft-l at full white pattern)........................................................1-9
1.4.1.2 Video AMP Performance ..................................................................................................1-9
1.4.1.3 Light Output ......................................................................................................................1-9
1.4.1.4 Contrast Adjustment Range...............................................................................................1-9
1.4.1.5 Brightness Adjustment Range ...........................................................................................1-9
1.4.1.6 Linearity (set to 20 Ft-L at full white pattern first) at Crosshatch Pattern.........................1-9
1.4.1.7 Geometric Distortion (with 20Ft-L at full white pattern)..................................................1-10
1.4.1.8 Size Stability......................................................................................................................1-10
1.4.1.9 Swing & Jitter....................................................................................................................1-10
1.4.1.10 Focus (The distance of watch is 30cm from eyes to screen)............................................1-10
1.4.1.11 DDC1/2B Table...............................................................................................................1-10
1.4.2 Color Quality......................................................................................................................................1-14
1.4.2.1 Misconvergence.................................................................................................................1-14
1.4.2.2 Moire (the distance of watch is 30cm from eyes to screen)...............................................1-15
1.4.2.3 Impurity.............................................................................................................................1-15
1.4.2.4 White Balance ...................................................................................................................1-15
1.4.2.5 Uniformity.........................................................................................................................1-15
1.4.2.6 Degaussing ........................................................................................................................1-15
1.4.3 Controls & Presetting .........................................................................................................................1-15
1.4.3.1 User Control (on the front panel).......................................................................................1-15
1.4.3.2 Presetting...........................................................................................................................1-16
1.4.3.3 User Setting.......................................................................................................................1-16
1.4.3.4 Microcontroller Control.....................................................................................................1-17
1.4.3.5 OSD Screen Position.........................................................................................................1-17

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No Copy/Reproduction Allowed 7277e Monitor Service Guide
iv
1.5 Physical Specifications........................................................................................................................................1-17
1.5.1 Physical Diminution & Appearance...................................................................................................1-17
1.5.1.1 Overall Dimensions...........................................................................................................1-17
1.5.1.2 Net Weight.........................................................................................................................1-17
1.5.1.3 Outer Appearance..............................................................................................................1-17
1.5.2 Construction and Materials on Outer Surface.....................................................................................1-17
1.5.3 Base & Swivel....................................................................................................................................1-17
1.5.4 Marking & Labels...............................................................................................................................1-17
1.5.4.1 Reference Label (Rear panel)............................................................................................1-17
1.5.4.2 Controls & Connectors......................................................................................................1-17
1.5.5 Packaging ...........................................................................................................................................1-18
1.5.5.1 Carton Dimension..............................................................................................................1-18
1.5.5.2 Shipping Weight................................................................................................................1-18
1.6 Maintainability Specifications.............................................................................................................................1-18
1.6.1 General & Requirements ....................................................................................................................1-18
1.6.1.1 Installation.........................................................................................................................1-18
1.6.1.2 Periodic Maintenance........................................................................................................1-18
1.6.1.3 Repair & Calibration .........................................................................................................1-18
1.6.2 Mean Time to Repair..........................................................................................................................1-18
1.6.2.1 Module Level.....................................................................................................................1-18
1.6.2.2 Component Level ..............................................................................................................1-18
1.6.3 Accessibility.......................................................................................................................................1-18
1.6.3.1 General ..............................................................................................................................1-18
1.6.3.2 Outside Cabinet, Access to the Following Elements.........................................................1-18
1.6.3.3 Cover Removal, Access.....................................................................................................1-18
1.6.4 Equipment & Tools Required.............................................................................................................1-18
1.6.4.1 Standard Test Equipment...................................................................................................1-18
2. CIRCUIT OPERATION THEORY.....................................................................................................................................2-1
2. 1 Deflection CKT ..................................................................................................................................................2-1
2.1.1 The Block Diagram of Deflection ......................................................................................................2-1
2.1.2 Autosync Deflection Controller (TDA4854)......................................................................................2-1
2.1.3 H-Driver & Output CKT ....................................................................................................................2-2
2.1.4 Dynamic Focus CKT..........................................................................................................................2-2
2.1.4.1 Vertical Dynamic Focus....................................................................................................2-3
2.1.4.2 Horizontal Dynamic Focus................................................................................................2-3
2.1.5 Brightness & Spot Killer CKT ...........................................................................................................2-3
2.1.5.1 G1 CKT.............................................................................................................................2-3
2.1.5.2 Blanking CKT ...................................................................................................................2-3
2.1.6 BDRV and Step-up CKT....................................................................................................................2-4
2.1.7 H-center CKT.....................................................................................................................................2-5
2.1.8 HV Shutdown Circuit.........................................................................................................................2-5
2.1.9 Horizontal Linearity CKT ..................................................................................................................2-5
2.1.10 ABL CIRCUIT.................................................................................................................................2-6
2.1.11 TILT CKT ........................................................................................................................................2-7
2.1.12 Vertical Output Circuit.....................................................................................................................2-7
2.2 Switching Power Supply Operation Theory........................................................................................................2-8
2.2.1 General Specification .........................................................................................................................2-8
2.2.2 Block Diagram....................................................................................................................................2-8
2.2.3 Circuit Operation Theorem.................................................................................................................2-8
2.2.3.1 RFI Filter...........................................................................................................................2-8
2.2.3.2 Rectifier and Filter.............................................................................................................2-8
2.2.3.3 Switching Element and Isolation Transformer..................................................................2-9
2.2.3.4 Output Rectifier and Filter.................................................................................................2-9
2.2.3.5 Control Circuit...................................................................................................................2-9
2.2.3.6 Feedback Circuit................................................................................................................2-10
2.2.3.7 Degauss Circuit .................................................................................................................2-10
2.2.3.8 Power Saving Control........................................................................................................2-11
2.2.4 Video C.K.T. Block Diagram.............................................................................................................2-11
2.2.4.1 OSD Preamp CKT.............................................................................................................2-11
2.2.4.2 CRT DRIVER CKT ..........................................................................................................2-12
2.2.4.3 DC Restore CKT ...............................................................................................................2-12
2.2.4.4 ABL CKT (Auto Brightness Limit)...................................................................................2-12
2.2.4.5 H-BLANK CKT................................................................................................................2-12
2.2.4.6 Brightness, V-blank, Change Mode Blank, Spotkiller CKT..............................................2-12
2.3 Microcontroller Circuit Operation Theory...........................................................................................................2-12

Table of Contents API Confidential
No Copy/Reproduction Allowed v
2.3.1 Introduction ........................................................................................................................................2-12
2.3.2 Block diagram.....................................................................................................................................2-13
2.3.3 MCU and the Peripheral Circuit Operation Theory............................................................................2-13
2.3.3.1 MCU Function...................................................................................................................2-13
2.3.3.2 How to Detect Mode Timing.............................................................................................2-13
2.3.3.3 Hat are the Valid Key Functions for User .........................................................................2-14
2.3.3.4 How to Memorize the Timing and Adjusted Data.............................................................2-14
2.3.3.5 How to Display the OSD Menu.........................................................................................2-14
2.3.3.6 How to Execute the Auto Alignment Function..................................................................2-14
2.3.3.7 Flowchart for Auto Calibration .........................................................................................2-15
3. ALIGNMENT PROCEDURE.............................................................................................................................................3-1
3.1 Preparation for Alignment...................................................................................................................................3-1
3.2 BAdjustment........................................................................................................................................................3-1
3.3 HV Adjustment....................................................................................................................................................3-1
3.4 H-center Adjustment............................................................................................................................................3-1
3.5 H-size Preset........................................................................................................................................................3-1
3.6 Factory Setting Mode Adjustment.......................................................................................................................3-1
3.7 Focus Adjustment................................................................................................................................................3-2
3.8 Convergence Adjustment.....................................................................................................................................3-2
3.9 Color Temperature Auto Aalignment..................................................................................................................3-2
3.9.1 Preparing Items...................................................................................................................................3-2
3.9.2 Alignment Procedure..........................................................................................................................3-2
3.9.3 Clear All of User Mode Data..............................................................................................................3-2
3.10 Geometry Specification .....................................................................................................................................3-2
3.11 Power Saving Function Check...........................................................................................................................3-3
4. TROUBLESHOOTING ......................................................................................................................................................4-1
4.1 Check MCU and OSD for No Video Output.......................................................................................................4-1
4.2 Check OSD, MCU for No OSD Window............................................................................................................4-2
4.3 Video Board.........................................................................................................................................................4-2
4.4 No Output Power.................................................................................................................................................4-3
4.5 No Raster.............................................................................................................................................................4-4
4.6 H.V. Abnormal ....................................................................................................................................................4-4
4.7 Check IC201........................................................................................................................................................4-5
4.8 No Vertical Output and Retrace Line No Blanking.............................................................................................4-6
4.9 Spot Killer NG.....................................................................................................................................................4-6
4.10 Focus NG...........................................................................................................................................................4-7
4.11 Horizontal Size Can Not Control.......................................................................................................................4-7
4.12 Size Regulation NG...........................................................................................................................................4-8
4.13 Unstable Vertical Display..................................................................................................................................4-8
4.14 No Blanking.......................................................................................................................................................4-9
Appendix A..............................................................................................................................................................................A-10
7277E Spare Parts List...............................................................................................................................................A-10
Important Service Instruction......................................................................................................................A-11

System Overview API Confidential
No Copy/Reproduction Allowed 1-1
Chapter 1
SYSTEM OVERVIEW
1.1 Introduction
This specification describes a low-cost high performance 17" color auto-scan monitor which will operate
with highend Windows and CAD/CAM applications. This intelligent monitor is microprocessor controlled with
a powerful memory base of pre-programmed screen and input configurations. It also allows users to place
their own settings into memory via external controls. It's setting status is indicated on screen. It is
compatible with various kind of computers and graphics adapters it synchronizes automatically with the
signal from 30kHz to 72kHz horizontal frequency and from 50Hz to 120Hz Vertical scan frequency. When it
works on 1024 x 768 non-interlaced/70Hz mode, the refresh rate for flicker-free high quality image will help to
reduce eye strain. A power management function has been designed to save power consumption and power
management is compliant with VESA and TCO. The monitor is available with two industrial designs: one for
ACER and the other for OEM.
It has the following features:
-With unique design of iScreen
-universal switching power supply
-0.28mm dot pitch CRT
-User controls: Power on/off, " P " , " " , " " , " S " , are all in front bezel.
-On screen control indicators for user:
<P1>display Contrast,Brightness,H-phase,H-size,V-center,V-size,Pincushion,Trapezoid,Tilt adjustment
status.
<P2>display Manual degaussing,iColor control and adjustment status.
<P3>display mode timings status.
-Power on/off indicator
-Power on auto degaussing
-20 seconds auto save function
-Total 32 modes for factory and user settings
-Tilt and swivel base
-Detachable power cable
-VGA resolution at 31.5kHz
640 X 400
640 X 480
-6448A resolution: 640X480 at 37.5kHz
-6448B resolution: 640X480 at 43.27kHZ
-SVGA resolution: 800X600 at 37kHZ to 48kHz
-UVGA resolution: 1024X768 at 48kHZ to 60kHz
-WS resolution: 1280 X 1024 (non-interlaced) at 64KHz/60kHz
-Automatic scanning all horizontal frequencies from 30kHz to72kHz
add all vertical frequencies between 50Hz and 120Hz
-Power management function
-MPRII function

1-2 API Confidential
No Copy/Reproduction Allowed 7277e Monitor Service Guide
1.2 Operational Specification
1.2.1 Environment
1.2.1.1 Temperature
-Operating 5 to +40 degrees Celsius
-Non-operating -20 to +60 degrees Celsius
1.2.1.2 Humidity
-Operating 20% to 90% non-condensing
-Non-operating 10% to 90% non-condensing
1.2.1.3 Altitude
-Operating 0 to 3,048m (10,000ft)
-Non-operating 0 to 12,192m (40,000ft)
-Operating condition / without packing
-Non-operating condition / with packing
1.2.2 Vibration
Package, Non-Operating
-5--26.6Hz : 0.6G
-26.6--50Hz: 0.016"
-50--500H : 2G
-Total Test Time : 312min
(104min/Axis for X, Y, Z)
After test, there is no electrical and mechanical damage permitted.
1.2.3 Drop Test (with packing)
1.2.3.1 Drop Height
PKG. Gross Wt. No. of Drops Drop Height
41 - 60.991b(18.7-27.7kg) 10 24"(61cm)
1.2.3.2 Drop Sequence
2
1
53
4
6
Surface 2. Front
3. Bottom
4. Rear
5. Left
6. Right
1. Top
Manufacturing
joint
-Corner 5-3-2 select at weakness side [the low left(or right) corner of the front panel]
-An edge drop with impact on the shortest edge radiating from corner 5-3-2
-An edge drop with impact on the next shortest edge radiating from corner 5-3-2
-An edge drop with impact on the longest edge radiating from corner 5-3-2
-A flat drop with impact on the rear
-A flat drop with impact on the front
-A flat drop with impact on the right
-A flat drop with impact on the left
-A flat drop with impact on the bottom
-A flat drop with impact on the top
After test, there is no electrical and mechanical damage permitted.
1.2.4 Electrostatic Discharge Requirements
The subject product must withstand 15kv test voltage of electrostatic discharge and meet the

System Overview API Confidential
No Copy/Reproduction Allowed 1-3
requirement as specified in ESD standard IEC801-2.
1.2.5 Safety Requirements
The display unit complies with the following safety standards and specifications.
1.2.5.1 110V Version
-UL compliance...standard for information-processing and business equipment, UL 1950.
-CSA compliance...standard C22.2 No. 950-M89, data processing equipment.
-DHHS...rules 21 sub-chapter J as of date of manufacture.
1.2.5.2 220V Version
-TUV compliance...EN60950 safety specification-business equipment.
-PTB...German X-ray emission standards.
-ZH1/618...German ergonomic standard.
-ISO9241-3...Ergonomic Requirements of Visual Display.
-Demko...EN60950.
-Nemko...EN60950.
-Semko...EN60950.
-Fimko...EN60950.
-CE marking compliance...73/23/EEC (EN60950)
1.2.6 EMC Requirements
This display unit complies with the following RFI rules and regulations.
1.2.6.1 110V Version
-FCC compliance....FCC Rule, Part 15, Subpart B, Class B.
-VCCI
1.2.6.2 220V Voltage
-CE Mark Compliance...89/336/EEC.
EN50082-1, IEC801-2, IEC801-3,IEC801-4.
EN50081-2, EN55022, CLASS B.
EN60555-2, EN60555-3.
-DNSF compliance...EN 55022, class B
-Low Radiation...MPRII
1.2.7 Acoustical Noise
With the display operating, the issue of sound measured is contained within 40 dB/A in the audible
field.
1.2.8 Reliability
Demonstration MTBF of the display unit shall be greater than 60,000 hours excluding the picture tube.

1-4 API Confidential
No Copy/Reproduction Allowed 7277e Monitor Service Guide
1.3. Input/Output Specifications
1.3.1 Input Signal Requirements
1.3.1.1 Signal cable (Directly attached to unit)
1.3.1.1.1 Video Inputs
-15pin mini D-sub connector is on the captive signal cable for IBM VGA, 8514A or
compatible graphics adapters The pin assignment's of this connector are as the follows.
15
610
11 15
**15pin mini D-sub male
1 RED VIDEO
2 GREEN VIDEO
3 BLUE VIDEO
4 GROUND
5 GROUND
6 RED GROUND
7 GREEN GROUND
8 BLUE GROUND
9 +5V
10 SYNC GROUND
11 GROUND
12 SDA
13 H.SYNC (H+V)
14 V.SYNC
15 SCL
1.3.1.1.2 Cable Length
1500mm +- 20mm
1.3.1.2 Video Signal
Analog 0.7 Vpp/75 ohm positive.
1.3.1.3 SYNC Signal
- Separate SYNC : TTL level
- Horizontal SYNC : positive/negative
- Vertical SYNC : positive/negative
- Composite SYNC : TTL level, positive/negative