Keysight VXI Bus 75000 C Series, Руководство по обслуживанию

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Keysight E1463A 32-Channel Form C Switch Service Guide 61
Repair/Maintenance Guidelines Service
Repair/Maintenance Guidelines
This section provides guidelines for repairing and maintaining the Keysight
E1463A 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 switch
modules. This damage can range from slight parameter degradation to
catastrophic failure. When handling the switch module assemblies, follow these
guidelines to avoid damaging components:
–
? Always use a static-free work station with a pad of conductive rubber or
similar material when handling electronic components.
– ? Do not use pliers to remove a MOS or CMOS device from a high-grip
socket. Instead, use a small screwdriver to pry the device up from one end.
Slowly lift the device up, one pair of pins at a time.
– ? After you remove a MOS or CMOS device from a module, place the
device onto a pad of conductive foam or other suitable holding material.
–
? 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
The etched circuit boards in the switch module 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:
–
? The relays used on these printed circuit boards require special soldering
techniques and equipment. The use of a solder-pot is recommended for
relay removal and replacement.
–
? 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 the
equipment is properly grounded.