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Maintenance
6–2
TDS 684A, TDS 744A, & TDS 784A Service Manual
H Section 10, Mechanical Parts List, lists all field replaceable modules by part
number.
Preparation
CAUTION. Static discharge can damage any semiconductor component in this
oscilloscope.
Precautions. When performing any service which requires internal access to the
oscilloscope, adhere to the following precautions to avoid damaging internal
modules and their components due to electrostatic discharge (ESD).
1. Minimize handling of static-sensitive modules.
2. Transport and store static-sensitive modules in their static protected
containers or on a metal rail. Label any package that contains static-sensitive
modules.
3. Discharge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these modules. Do service of static-sensitive
modules only at a static-free work station.
4. Nothing capable of generating or holding a static charge should be allowed
on the work station surface.
5. Handle circuit boards by the edges when possible.
6. Do not slide the modules over any surface.
7. Avoid handling modules in areas that have a floor or work-surface covering
capable of generating a static charge.
Susceptibility to ESD. Table 6–1 lists the relative susceptibility of various classes
of semiconductors. Static voltages of 1 kV to 30 kV are common in unprotected
environments.
Preventing ESD