Agilent Technologies E1364A - Manual (Page 46)

Repair and Maintenance Guidelines
This section provides guidelines for repairing and maintaining the E1364A
Switch Module, including:
•
ESD precautions
•
Soldering printed circuit boards
•
Post-repair safety checks
ESD Precautions
Electrostatic discharge (ESD) may damage static sensitive devices in the
E1364A Switch Module. This damage can range from slight parameter
degradation to catastrophic failure. When handling switch assemblies,
follow these guidelines to avoid damaging switch components:
•
Always use a static-free work station with a pad of
conductive rubber or similar material when handling
switch components.
•
If a device requires soldering, be sure the assembly is
placed on a pad of conductive material. Also, be sure that
you, the pad, and the soldering iron tip are grounded to
the assembly.
Soldering Printed
Circuit Boards
Some of the components on the etched circuit boards in the switch have
plated through-holes that allow a solder path to both sides of the insulating
material. Soldering can be done from either side of the board with equally
good results. When soldering to any circuit board, keep in mind the
following guidelines:
•
Avoid unnecessary component unsoldering and soldering.
Excessive replacement can result in damage to the circuit
board and/or adjacent components.
•
Do not use a high-power soldering iron on etched circuit
boards, as excessive heat may lift a conductor or damage
the board.
•
Use a suction device or wooden toothpick to remove
solder from component mounting holes. When using a
suction device, be sure that the equipment is properly
grounded.
Post-Repair
Safety Checks
After making repairs to the E1364A Switch Module, inspect the switch for
any signs of abnormal internally generated heat, such as discolored printed
circuit boards or components, damaged insulation, or evidence of arcing.
Determine and correct the cause of the condition. Then perform the
Functional Verification Test described in Chapter 2 to verify that the switch
is functional.
46 Service Chapter 4