Mandatory Regulations
7705 SAR-M Chassis Installation Guide 39
Unit Repair
The following stringent precautions are recommended to protect ESD-sensitive devices
during repair to the 7705 SAR-M.
• Ground the work bench to the earth and cover the work surface with an anti-static or
static dissipative material bonded to the bench. A field service kit or equivalent can
be used if an adequate work bench is not available.
• Use a wrist strap of 250 kΩ to 2 MΩ that contacts your skin and is connected to the
bolt that bonds the covering to the bench or safety ground.
• Ground all electrical equipment through a 3-wire power cord.
• Do not allow clothing to touch the unit or ESD-sensitive device under repair.
• Keep units in their original containers until actually needed, as units containing
ESD-sensitive devices are delivered from the manufacturer with protective packing
(containers or conductive foam).
• Keep containers that have units with ESD-sensitive devices in contact with the
anti-static work surface, and make sure your anti-static wrist strap is connected
before removing parts from containers. Devices should be handled by their bodies.
Contact the lead only when necessary.
• Ensure test setups have the correct voltage polarity.
• Do not use VOM-type meters to measure resistance, as this can damage
electrostatic-sensitive devices.
• Use only anti-static (metallized) desoldering tools.
Equipment Interconnection Points
Interconnection points of the 7705 SAR-M are defined as the following SELV connectors:
• T1/E1 (variants with T1/E1 ports)
• Ethernet (10/100/1000 Base-T)
•ToD
•alarms
• management port
• external clock inputs and clock outputs (2.048 MHz, 5 MHz, 10 MHz)
• console port
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