Motorola DIMETRA MTS 4 Installation, Configuration, And Service Manual page 201

Applicant: Motorola Solutions
Appendix
C
Static Precautions and ESD Strap
This Appendix covers the following topics:
• Static Sensitive Precautions on page 419
• ESD Wrist Strap Safety Precautions on page 419
Static Sensitive Precautions
The static grounding wrist strap (Motorola P/N 4280385A59) must always be used when handling any board or
module within the MTS. Many of the boards or modules used in the MTS equipment are vulnerable to damage from
static charges.
Extreme care must be taken while handling, shipping, and servicing these boards or modules. To avoid static damage,
observe the following precautions:
• Before handling, shipping, and servicing MTS equipment, connect a wrist strap to the grounding clip on the
equipment cabinet which is located at the bottom of the cabinet and marked with a yellow label. This discharges
any accumulated static charges.
• Avoid touching any module, board circuitry, including any connector pins with your hands.
• Before removing a board or module, disconnect its individual power supply first.
• Avoid carpeted areas, dry environments, and certain types of clothing (silk, nylon, and so on) during service or
repair due to the possibility of static buildup.
• Apply power to the circuit under test before connecting low impedance test equipment (such as pulse generators).
When testing is complete, disconnect the test equipment before power is removed from the circuit under test.
• Be sure to ground all electrically powered test equipment. Connect a ground lead (-) from the test equipment to the
board or module before connecting the test probe (+). When testing is complete, remove the test probe first, then
remove the ground lead.
• Lay all circuit boards and modules on a static dispersive surface (a proper antistatic map) when removed from the
system. This mat will be connected to ground through a high resistance element.
• Never use non-conductive material for packaging modules being transported. All modules should be wrapped with
anti-static packaging material. Replacement modules shipped from the factory are packaged in a conductive
material, for example, antistatic bag.
ESD Wrist Strap Safety Precautions
The ESD socket built into the cabinet housing provides a point to which a wire from a wrist strap can be connected.
This is for ESD (electrostatic discharge) protection.
Warning: Use extreme caution when wearing a conductive wrist strap near sources of high voltage.
The low impedance provided by the wrist strap also increases the danger of lethal shock should
accidental contact with high voltage sources occur.
Equipment Type: ABZ89FC5827 / 109AB-5827
419 | Static Precautions and ESD Strap
6802800U74-AD | September 2014 | Send Feedback
Exhibit D2