User manual

Repair/
Maintenance
Guidelines
This section provides guidelines for repairing and maintaining the
Agilent E1460A multiplexer module, including:
• ESD precautions
• Soldering printed circuit boards
• Post-repair safety checks
ESD Precautions Electrostatic discharge (ESD) may damage static-sensitive devices in the
multiplexer module. This damage can range from slight parameter
degradation to catastrophic failure. When handling multiplexer 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 board in the multiplexer module has 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:
• 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 module, inspect the device 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 device is
functional.
54 Service Agilent E1460A Service Manual