Huawei MU709 Series Hardware Manual page 45

HUAWEI MU709 Series HSPA+ Mini PCIe Module
Hardware Guide
 The EPA must use the ESD two-circuit wrist strap, and the wrist strap must be
connected to the dedicated jack. The crocodile clip must not be connected to the
ground.

The ESD sensitive components, the processing equipment, test equipment, tools,
and devices must be connected to the ground properly. The indexes are as
follows:
Hard ground resistance < 4 Ω
−
Ω ≤ Soft ground resistance < 1 x 10
5
− 1 x 10
Ω ≤ ICT fixture soft ground resistance < 1 x 10
5
−
1 x 10
−
The electronic screwdriver and electronic soldering iron can be easily oxidized.
Their ground resistance must be less than 20 Ω.

The parts of the equipment, devices, and tools that touch the ESD sensitive
components and moving parts that are close to the ESD sensitive components
must be made of ESD materials and have sound ground connection. The parts
that are not made of ESD materials must be handled with ESD treatment, such
as painting the ESD coating or ionization treatment (check that the friction voltage
is less than 100 V).

Key parts in the production equipment (parts that touch the ESD sensitive
components or parts that are within 30 cm away from the ESD sensitive
components), including the conveyor belt, conveyor chain, guide wheel, and SMT
nozzle, must all be made of ESD materials and be connected to the ground
properly (check that the friction voltage is less than 100 V).

Engineers that touch IC chips, boards, modules, and other ESD sensitive
components and assemblies must wear ESD wrist straps, ESD gloves, or ESD
finger cots properly. Engineers that sit when handling the components must all
wear ESD wrist straps.

Noticeable ESD warning signs must be attached to the packages and placement
areas of ESD sensitive components and assemblies.

Boards and IC chips must not be stacked randomly or be placed with other ESD
components.

Effective shielding measures must be taken on the ESD sensitive materials that
are transported or stored outside the EPA.
HUAWEI MU709 module does not include any protection against overvoltage.
Electrical and Reliability Features
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Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2015-06-25)
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