Zte ZXG10 BS21 User manual

ZXG10BS21
Compact Outdoor BTS for GSM
Maintenance Manual
Version 2.2
ZTE CORPORATION
ZTE Plaza, Keji Road South,
Hi-Tech Industrial Park,
Nanshan District, Shenzhen,
P. R. China
518057
Tel: [phone] 800-9830-9830
Fax: [phone]
URL: http://support.zte.com.cn
E-mail: [e-mail]

LEGAL INFORMATION
Copyright © 2005 ZTE CORPORATION.
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disclaimed, including without limitation any implied warranty of merchantability, fitness for a particular purpose, title or non-
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ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the
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or training are subject to change without notice.
Revision History
Date Revision No. Serial No. Description
05/17//2005 R1.0 sjzl20051442
05/19/2007 R1.1 sjzl20051442 Updated

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Name ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
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Contents
About this Maintenance Manual ...............................................................xi
Purpose of this Maintenance Manual........................................................................ xi
Typographical Conventions .....................................................................................xii
Mouse Operation Conventions................................................................................xiii
How to Get in Touch ............................................................................................. xiii
Customer Support .................................................................................................................xiii
Documentation Support.........................................................................................................xiii
Chapter 1........................................................................................ 1
Maintenance Security.................................................................................1
Overview ............................................................................................................... 2
Symbol Description ................................................................................................. 2
Toxic Substances .................................................................................................... 4
Beryllia ...................................................................................................................................4
Hydrochloride..........................................................................................................................4
Electrical Safety ...................................................................................................... 5
Tools ......................................................................................................................................5
High Voltage ...........................................................................................................................5
Power Cord .............................................................................................................................5
Drilling ....................................................................................................................................5
Thunder ..................................................................................................................................6
Antistatic ............................................................................................................... 6
Storage Battery ...................................................................................................... 7
Short Circuit............................................................................................................................8
Hazardous Gases ....................................................................................................................8
High Temperature ...................................................................................................................8
Acid Liquid ..............................................................................................................................8
Storage Battery Replacement ..................................................................................................9
Electromagnetic Radiation ....................................................................................... 9
Working at Heights ............................................................................................... 10
Hoisting Heavy Objects..........................................................................................................10
Using Ladders .......................................................................................................................10
Fans .................................................................................................................... 11

High Temperature ................................................................................................ 11
Board Plugging/Unplugging ................................................................................... 11
Do-Nots ............................................................................................................... 12
Chapter 2......................................................................................13
Maintenance Overview............................................................................ 13
Categories of Daily Maintenance............................................................................. 14
Common Maintenance Methods ............................................................................. 14
Precautions on Daily Maintenance .......................................................................... 16
Chapter 3......................................................................................19
Routine Maintenance .............................................................................. 19
Daily Routine Maintenance .................................................................................... 20
Viewing Current Alarms .........................................................................................................20
Viewing Alarms in Each Module .............................................................................................. 22
Viewing Current Notification Information ................................................................................ 25
Viewing Real-time Attributes of a Carrier ................................................................................29
Creating Daily Performance Report......................................................................................... 30
Creating a Daily Traffic Report................................................................................................35
Weekly Routine Maintenance ................................................................................. 39
Viewing History Alarms..........................................................................................................39
Collecting Alarm Frequency Statistics ..................................................................................... 44
Analyzing Performance Report ............................................................................................... 48
Monthly Routine Maintenance ................................................................................ 48
Creating Monthly Performance Report .................................................................................... 48
Collecting Statistics of Bad Cells .............................................................................................53
Analyzing and Processing Reports .......................................................................................... 57
Generating Monthly Operation Report..................................................................................... 58
Biannual Routine Maintenance ............................................................................... 58
Checking BS21 AC Power ...................................................................................................... 59
Checking Running Status of Heat Exchanger........................................................................... 60
Checking Dust-Proof Status ................................................................................................... 60
Checking Running Status of CMM Module ............................................................................... 61
Checking Running Status of ETRM Module .............................................................................. 64
Checking Running Status of ECDU Module .............................................................................. 67
Measuring Amplifier Output Power ......................................................................................... 69
Measuring SWR of Antenna Feeder ........................................................................................ 69
Calibrating Clock ...................................................................................................................71
Checking Fastness of Antennae and Towers............................................................................ 72
Checking Obliquity of Directional Antennae ............................................................................. 72
Checking whether Antenna Feeder Connectors and Lightning Protection Grounding Kit are
Waterproof............................................................................................................................74

Checking E1 Interfaces ..........................................................................................................75
Checking Antenna Feeder Interfaces ...................................................................................... 76
Checking Whether Lightning Protection Arrester is in Good Condition ....................................... 76
Checking whether Grounding Cable is Reliable ........................................................................78
Grounding Resistance Test..................................................................................................... 78
Checking Running Status of Transmission Equipment.............................................................. 79
Checking Running Status of UPS ............................................................................................ 79
Chapter 4......................................................................................81
Notification and Handling ....................................................................... 81
Summary of Notification Information...................................................................... 82
No Traffic Notification in BS Cell ............................................................................. 82
Chapter 5......................................................................................85
Alarms and Handling............................................................................... 85
Summary of Alarms.............................................................................................. 86
CMM Alarms......................................................................................................... 90
CMM Power Failure ................................................................................................................90
LAPD Long-Time Link Disconnection ....................................................................................... 91
CMM's FLASH Programming Failure ........................................................................................ 92
HW Long Time Link Disconnection.......................................................................................... 92
Power Over/Under-Voltage Alarms ......................................................................................... 93
Clock Exceptions (13M, FCLK, SYNCLK).................................................................................. 93
Software Accumulative Frame Number Inconsistent with Hardware Accumulative Frame Number
............................................................................................................................................94
Alarms of Communication Link to Main Rack........................................................................... 95
Alarm with Communication Link between Master Rack and Left/Right Slave Rack.....................95
E1 Carrier Wave Receiving Alarm (A, D and E interfaces) ........................................................ 96
Out-of-Frame Alarm at Receiving End of E1 interfaces (A, D and E interfaces).......................... 97
Forward Slip Code Indication at Transmitting End of E1 Interfaces (A, D and E interfaces) ........ 97
Backward Slip Code Indication at Transmitting End of E1 Interfaces (A, D and E Interfaces) .....98
Forward Slip Code Indication at Receiving End of E1 Interfaces (A, D and E Interfaces) ............99
Backward Slip Code Indication at Receiving End of E1 Interfaces (A, D and E Interfaces) ........ 100
ETRM Alarm ....................................................................................................... 101
Dry Contact Alarm............................................................................................................... 101
LNA (Low Noise Amplifier) Alarm.......................................................................................... 102
Power Alarm for Tower Mounted Amplifier ............................................................................ 102
AEM SWR Minor Alarm ........................................................................................................ 103
AEM SWR Major Alarm ........................................................................................................ 103
AEM Power Alarm ................................................................................................................ 104
AEM Type Alarm.................................................................................................................. 104
AEM Not-in-Position Alarm ................................................................................................... 105
TPU’s CHP DSP0 Initialization Failure .................................................................................... 105

TPU’s CHP DSP1~3 Initialization Failure................................................................................ 106
RFAD6620 Initialization Failure............................................................................................. 107
RFAD6620 Resource Unavailable.......................................................................................... 107
CIP Resource Unavailable .................................................................................................... 108
TPU’s FLASH MEMORY Error................................................................................................. 109
WATCHDOG Overflow in TPU’s CHP DSP0............................................................................. 109
WATCHDOG Overflow in TPU’s CHP DSP1~3 ........................................................................ 110
WATCHDOG Overflow in FUC ............................................................................................... 111
Parameter Configuration Error in TPU’s Channel 0~7 ............................................................ 111
Inconsistent Cell Parameter Configuration............................................................................. 112
Inconsistent FUC Software Versions ..................................................................................... 112
Inconsistent CHP Software Versions ..................................................................................... 113
Temporary No Response from FUC’s L3 Software.................................................................. 113
Disconnected LAPD Link between FUC and BSC .................................................................... 114
Interrupted Communication between CMM and FUC ............................................................. 115
TPU’s CIP Initialization Failure .............................................................................................. 116
CIP Parameter Configuration Error ....................................................................................... 116
WATCHDOG Overflow in TPU’s CIP....................................................................................... 117
Inconsistent CIP Software Versions ...................................................................................... 117
Alarm with Clock between TPU and CMM .............................................................................. 118
TPU Power Alarm ................................................................................................................ 119
TPU Frame Number Alarm ................................................................................................... 119
Receiving RF Local Oscillator PLL1~2 out of Lock .................................................................. 120
Transmitting RF Local Oscillator PLL1~2 out of Lock .............................................................. 121
52 M Reference Clock PLL Out of Lock .................................................................................. 121
Transmitting IF Local Oscillator PLL Out of Lock..................................................................... 122
PA Voltage SWR Alarm ........................................................................................................ 123
PA Overheat Minor Alarm..................................................................................................... 123
PA Overheat Major Alarm .................................................................................................... 124
PA Output Power Alarm ....................................................................................................... 124
PAS Power Amplifier Power Supply Over-voltage Alarm......................................................... 125
PAS Power Amplifier Power Supply Under-voltage Alarm ....................................................... 125
DLRC_AL Downward Link Check Error .................................................................................. 126
Chapter 6....................................................................................127
Troubleshooting .................................................................................... 127
Summary of Common Problems .......................................................................... 128
List of Major Faults.............................................................................................. 129
Troubleshooting Procedure of Components Failures ............................................... 129
Troubleshooting at BS Commissioning Stage......................................................... 130
BS Works Normally but Mobile Phone Has no Signals or Cannot Access Network .................... 130
Handling of SWR Major Alarms............................................................................................. 132

Poor Conversation Quality at BS........................................................................................... 134
Troubleshooting in BS Maintenance Stage............................................................. 137
Shrinkage of BS Coverage ................................................................................................... 137
Cell Carrier not Occupied ..................................................................................................... 140
LAPD Broken-Link of BS Carrier............................................................................................ 142
BS in Normal Status but BS Handover Is Abnormal............................................................... 147
Handling Lightning-Stricken BS Faults .................................................................................. 149
MS Signal is not Stable in Idle State ..................................................................................... 151
Unstable MS Signal in Conversation...................................................................................... 153
TCH Assigned with Low Success Ratio and Calls Are Difficult to Get through ........................... 154
MS Echo during Conversation............................................................................................... 156
Troubleshooting in BS Cutover and Expansion Stages ............................................ 158
Unidirectional Mobile Phone Calls.......................................................................................... 158
SDCCH Occupied too Long................................................................................................... 160
Call Drop Rate in Cell Rises Suddenly ................................................................................... 163
Chapter 7....................................................................................167
Collection of Maintenance Experience.................................................. 167
Reference for Wireless Parameters Adjustment during Commissioning .................... 168
Adjusting List of Adjacent Cells and List of Carrier-Sense Frequencies .................................... 168
Adjusting Wireless Parameters ............................................................................................. 170
Others ................................................................................................................................ 171
Analysis of Bird928 Mobile Phone’s Failure to Access Network................................. 172
Configuration Method for Intra-Cell Handover ....................................................... 174
Appendix A .................................................................................175
Replacement of Modules and Parts ...................................................... 175
Overview ........................................................................................................... 175
CMM Replacement .............................................................................................. 176
ETRM Replacement............................................................................................. 177
AEM Replacement............................................................................................... 178
PSM Replacement............................................................................................... 179
Power Lightning Protection Module Replacement ................................................... 180
Backplane Replacement ...................................................................................... 181
Heat Exchanger Replacement .............................................................................. 182
Trunk Cable Replacement.................................................................................... 183
RF Cable Replacement ........................................................................................ 184
Antenna Feeder Lightning Arrester replacement .................................................... 185
Cabinet-Bottom 1/2 Soft Jumper Replacement...................................................... 187
Tower Top 1/2” Soft Jumper Replacement ............................................................ 188
Feeder Connectors Replacement .......................................................................... 190

Tower Amplifier Replacement .............................................................................. 191
Antenna Replacement ......................................................................................... 192
Appendix B .................................................................................195
Common Maintenance Tables............................................................... 195
Daily Maintenance Record Table........................................................................... 195
Weekly Maintenance Record Table ....................................................................... 196
Monthly Maintenance Record Table ...................................................................... 197
Biannual Maintenance Record Table ..................................................................... 198
Emergency Failure Record Table .......................................................................... 199
Appendix C .................................................................................201
Use of Common Instruments and Meters ............................................ 201
SAGEM (OT35) Test Mobile Phone........................................................................ 201
Basic Functions ................................................................................................................... 201
Operation Description .......................................................................................................... 202
Engineering Test Mode of ZTE289 Mobile Phone .................................................... 211
Key Description ................................................................................................................... 211
How to Enter Engineering Mode ........................................................................................... 211
How to Close Engineering Mode ........................................................................................... 211
Instructions of Engineering Mode Menu ................................................................................ 211
BIRD Power Meter .............................................................................................. 214
BIRD Power Meter Components ........................................................................................... 214
Usage ................................................................................................................................. 215
HP8954E Spectrum Analyzer ............................................................................... 217
Components ....................................................................................................................... 218
Usage ................................................................................................................................. 218
Antenna Feeder Tester (SITE MASTER S332B) ...................................................... 222
Procedure for Testing SWR .................................................................................................. 222
Test Procedure of DTF ......................................................................................................... 223
Appendix D.................................................................................225
Operation Maintenance Quality Indexes of Certain Telecom Network
(Wireless Part)...................................................................................... 225
Abbreviations .............................................................................227
Figures........................................................................................233
Tables .........................................................................................235

Confidential and Proprietary Information of ZTE CORPORATION xi
About this Maintenance
Manual
ZXG10 BS21 (V2.2) Base Station Transceiver Station Maintenance Manual
describes maintenance safety, routine maintenance items and methods,
handling of alarm and notification information, handling of common faults
and maintenance experience of the ZXG10 BS21 (V2.2). The manual
serves as a reference manual in the maintenance and fault handling of the
ZXG10 BS21 (V2.2) equipment.
The complete set of manuals is listed below:
ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Guide to
Documentation
ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Technical Manual
ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Hardware Manual
ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Installation Manual
ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
Purpose of this Maintenance
Manual
Chapter 1, Maintenance Security, presents the meanings of the signs used
in this manual. It also covers some safety precautions related to the
installation procedure, such as precautions against high voltage,
thunderstorms and overhead operations.
Chapter 2, Maintenance Overview, introduces daily maintenance
categories, common maintenance methods and some precautions on
maintenance of ZXG10 BS21 (V2.2) base station controllers.
Chapter 3, Routine Maintenance, explains routine maintenance items of
the ZXG10 BS21 (V2.2) base station controller equipment and details
instrument requirements, check methods and fault handling of individual
maintenance items; among them, the version of the OMCR interface
diagram is the software OMCRV2.52.02a for the time being.

ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
xii Confidential and Proprietary Information of ZTE CORPORATION
Chapter 4, Notification and Handling, provides notification messages
related to the ZXG10 BS21 (V2.2) base station controller in the ZXG10-
BSS base station subsystem so that the system maintenance personnel
can have a clear understanding of notification messages in the system,
including meanings causes and handling of notification messages.
Chapter 5, Alarms and Handling, covers the alarm information in the
ZXG10-BSS Base Station Subsystem related to ZXG10 BS21 (V2.2), in
order for system maintenance personnel to have a clear idea about the
alarm messages given by the system, including their meaning, cause and
way of handling.
Chapter 6, Troubleshooting, gives an introduction to the universal
methods for the common faults of the ZXG10 BS21 (V2.2), including fault
symptoms, source, analysis, location and troubleshooting.
Chapter 7, Collection of Maintenance Experience, provides some
experience derived from project maintenance for your reference.
Appendix A, Replacement of Modules and Parts, describes the procedure
for and precautions on the replacement of modules and backplanes.
Appendix B, Common Maintenance Tables, lists forms used in routine
maintenance.
Appendix C, Use of common Instruments and Meters, introduces the
instructions on common instruments and meters used for maintaining the
ZXG10 BS21 (V2.2) transceiver station.
Appendix D, Operation Maintenance Quality Indexes of Certain Telecom
Network (Wireless Part), describes the telecommunication network
operation maintenance quality indexes (wireless part) as required by a
certain carrier for your reference.
Typographical Conventions
ZTE documents employ the following typographical conventions.
TABLE 1TYPOGRAPHICAL CONVENTIONS
Typeface Meaning
Italics References to other guides and documents; parameter values
“Quotes” Links on screens
Bold Menus, menu options, input fields, radio button names, check
boxes, drop-down lists, dialog box names, window names
Bold, with first
letter capitalized Keys on the keyboard and buttons on screens and company
name
Constant width Text that you type, program code, files and directory names,
and function names

About this Maintenance Manual
Confidential and Proprietary Information of ZTE CORPORATION xiii
Typeface Meaning
[]Optional parameters
{ } Mandatory parameters
| Select one of the parameters that are delimited by it
Note: Provides additional information about a certain topic
Checkpoint: Indicates that a particular step needs to be checked
before proceeding further
Tip: Indicates a suggestion or hint to make things easier or
more productive for the reader
Mouse Operation Conventions
TABLE 2MOUSE OPERATION CONVENTIONS
Typeface Meaning
Click Refers to clicking the primary mouse button (usually the left
mouse button) once.
Double-click Refers to quickly clicking the primary mouse button (usually the
left mouse button) twice.
Right-click Refers to clicking the secondary mouse button (usually the right
mouse button) once.
Drag Refers to pressing and holding a mouse button and moving the
mouse.
How to Get in Touch
The following sections provide information on how to obtain support for
the documentation and the software.
Customer Support
If you have problems, questions, comments, or suggestions regarding
your product, contact us by e-mail at [email protected]. You can also
call our customer support center at (86) 755 26771900 and (86) 800-
9830-9830.
Documentation Support
ZTE welcomes your comments and suggestions on the quality and
usefulness of this document. For further questions, comments, or

ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
xiv Confidential and Proprietary Information of ZTE CORPORATION
suggestions on the documentation, you can contact us by e-mail at
[email protected]; or you can fax your comments and suggestions to (86)
755 26772236. You can also explore our website at
http://support.zte.com.cn, which contains various interesting subjects like
documentation, knowledge base, forum and service request.

Confidential and Proprietary Information of ZTE CORPORATION 1
Chapter 1
Maintenance Security
In this chapter, you will learn about:
Safety regulations to be observed
Instructions on the safety symbols

ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
2 Confidential and Proprietary Information of ZTE CORPORATION
Overview
To avoid any accident, please carefully read safety instructions in this
chapter before conducting any maintenance operation on the ZXG10 BS21
(V2.2) device. If there are local safety specifications to be followed, the
safety instructions here shall only serve as a supplement to the local
safety specifications. If there is any conflict between them, the local safety
specifications shall prevail.
Maintenance personnel of the ZTE BS21 (V2.2) device should have the
basic safe operation knowledge, pass the relevant technical training,
correctly grasp the device operation and maintenance methods as well as
obtain the corresponding qualification.
During operation and maintenance on the ZTE BS21 (V2.2) device, please
strictly observe the equipment precautions and special safety instructions
provided by ZTE Corporation.
In addition, the safety instructions listed in this manual are only those
calling for special attentions of users provided by ZTE. ZTE Corporation
shall not be liable for any behavior against the general safe operation
requirements or against the safety standards for the design, production
and use of the equipment.
Symbol Description
Safety symbols quoted in this manual are shown in Table 3, prompting
users to follow safety instructions during equipment maintenance.
TABLE 3SAFETY SIGNS
Safety Signs Meaning
Danger: Indicates an imminently hazardous situation, which if
not avoided, will result in death or serious injury. This signal
word should be limited to only extreme situations.
Warning: Indicates a potentially hazardous situation, which if
not avoided, could result in death or serious injury.
Caution: Indicates a potentially hazardous situation, which if not
avoided, could result in minor or moderate injury. It may also
be used to alert against unsafe practices.
Note: Indicates a potentially hazardous situation, which if not
avoided, could result in injuries, equipment damage or
interruption of services.
Erosion: Beware of erosion.

Chapter 1 - Maintenance Security
Confidential and Proprietary Information of ZTE CORPORATION 3
Safety Signs Meaning
Electric shock: There is a risk of electric shock.
Electrostatic: The device may be sensitive to static electricity.
Microwave: Beware of strong electromagnetic field.
Laser: Beware of strong laser beam.
No flammables: No flammables can be stored.
No touching: Do not touch.
No smoking: Smoking is forbidden.
Among them, universal alarm symbol adopts four grades. Based on
the descending order of the danger degree, they are: danger, warning,
caution and notes. Their respective formats and meanings are described
as below.
Danger: This sign means that personal death or major accidents such as
equipment damage or breakdown may occur if you ignore this safety warning.
Warning: This sign means that there may be a major or serious accident,
equipment damage or interruption of key services if you ignore this safety warning.
Caution: This sign means that serious injury or death, equipment damage or
interruption of some services may occur if you ignore this safety warning.
Notes: This sign means that an injury, equipment damage or interruption of local
services may occur if you ignore this safety warning.
To the right of a safety sign is a text indicating its safety level. Under the
sign is the detailed safety description.

ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
4 Confidential and Proprietary Information of ZTE CORPORATION
Toxic Substances
Beryllia
Warning: Beryllia is a type of toxic chemical existing in the transistor and other
components. The power amplifier circuit and AEM circuit in the base station contain
Beryllia, so it is advised not to touch these components directly under any
circumstances.
Beryllium oxide dusts may be produced when a component containing
beryllium oxide is broken, frictionized or bruised. They may seriously hurt
human skin and membrane even life safety.
Beryllium oxide may hurt human bodies only when components containing
beryllium oxide are damaged. Therefore, be sure to take care when
replacing or handling such components and boards and avoid any
mechanical damage.
Do not discard components containing beryllium oxide randomly. Please
observe local regulations to make chemical treatment or special waste
material treatment for components containing beryllium oxide.
If you suspect that beryllium oxide has entered your skin or been
absorbed in your body, please thoroughly rinse the skin wound with water
and then see the doctor immediately.
The personnel contacting or handing such components should understand
the characteristics of such components and take the corresponding
preventive measures.
Hydrochloride
Warning: Chemicals containing hydrochloride have to be used in some
components of the BS21 (V2.2) device. Burning these components will generate
toxic gas.
Do not burn the components and take preventive measures to avoid
inhaling toxic gas.
Do not discard components containing hydrochloride randomly. Please
observe local regulations to make chemical treatment or special waste
material treatment for components containing hydrochloride.

Chapter 1 - Maintenance Security
Confidential and Proprietary Information of ZTE CORPORATION 5
Electrical Safety
Tools
Warning: Be sure to use special tools rather than common tools for high-voltage
and AC operations.
High Voltage
Danger: High voltage is hazardous. Direct or indirect contact with high voltage or
mains supply through a wet object could result in fatal danger.
Do follow the local safety regulations to install any AC power equipment.
Personnel who that installs AC devices must be qualified for high-voltage
and AC operations.
During operation, it is strictly forbidden to wear any conductive articles
such as watch, chain and ring.
Please prevent water from entering the equipment during operation and
maintenance in damp environments.
Power Cord
Notes: Do not install or remove power cables with power on. Contact of the power
cable with any conductor will generate electric spark or electric arc, which may
cause fire or eye injury.
Do turn off the power supply before connecting or disconnecting a power
cable.
Before connection, make sure the connecting cable and its label suit the
actual installation requirements.
Drilling
Warning: It is not allowed to drill the cabinet without permission.
Unqualified drilling could damage the wiring and cables inside the cabinet.
Additionally, metal pieces inside the cabinet created by the drilling could
result in a shorted circuit board.
When it is necessary to drill holes in the cabinet in some special cases,
please wear insulated protective gloves and move away the cables in the

ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
6 Confidential and Proprietary Information of ZTE CORPORATION
cabinet before drilling. Take care to protect your eyes during drilling.
Flying metal scraps may harm your eyes. In addition, please promptly
clean and clear metal scraps after drilling.
Thunder
Danger: Operations concerned with high-voltage, AC, iron tower or mast are
strictly forbidden in thunderstorms.
Thunderstorms would give rise to a strong electromagnetic field in the
atmosphere. So, the equipment should be earthed and protected in time
against lightning strike.
Antistatic
Notes: The static electricity produced by the human body could damage the static-
sensitive components on the circuit board, such as large-scale integrated circuits
(IC).
Friction caused by human body’s activities is a source of accumulation of
static charge. When it is dry, the static voltage a human body carries may
be as high as 30kV, and may stay a long while. An operator with static
may cause damage to a device when in touch with it due to the discharge
from the device.
To avoid any damage to sensitive devices by human body static, an
operator should wear an antistatic wrist strap before touching devices,
plug-in boards, circuit boards and IC chips, and well ground the other end
of the antistatic wrist strap.
The cable between the wrist and the ground must be connected in series
with a more than 1M ohm resistance to protect operators from electric
shock. The static discharge from a 1M ohm-plus resistance is sufficiently
low.
Check the antistatic wrist strap regularly. Do not replace the cable of the
wrist strap with any other cable.
Static-sensitive board should not be in touch with any objects carrying
static electricity or easy to generate static electricity. For example, friction
of the package, conveyor box and conveyor belt made of insulation
materials will make the components statically electrified. These
components will discharge static electricity when touching human body or
the ground, thus being damaged.
Static-sensitive boards can only touch high quality discharging materials
such as static-protective packages. Use static-protective packages on
boards during storage and transportation.