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Maintenance
6–2
WFM 90 and WFM 91 Service Manual
This instrument contains electrical components that are susceptible to damage
from electrostatic discharge. Static voltages of 1 kV to 30 kV are common in
unprotected environments.
CAUTION. Static discharge can damage any semiconductor component in this
instrument.
Observe the following precautions to avoid static damage:
H Minimize handling of static-sensitive components.
H Transport and store static-sensitive components or assemblies in their
original containers, on a metal rail, or on conductive foam. Label any
package that contains static-sensitive assemblies or components.
H Discharge the static voltage from your body by wearing a wrist strap while
handling these components. Servicing static-sensitive assemblies or
components should only be performed at a static-free workstation by
qualified personnel.
H Nothing capable of generating or holding a static charge should be allowed
on the workstation surface.
H Keep the component leads shorted together whenever possible.
H Pick up components by the body, never by the leads.
H Do not slide the components over any surface.
H Avoid handling components in areas that have a floor or work surface
covering capable of generating a static charge.
H Use a soldering iron that is connected to earth ground.
H Use only special antistatic, suction-type or wick-type desoldering tools.
NOTE. A 2% RMA flux content solder is recommended for making repairs in this
instrument. Cleaning of rosin residue is not recommended. Most cleaning
solvents tend to reactivate the rosin and spread it under components where it
may cause corrosion under humid conditions. The rosin residue, if left alone,
does not exhibit these corrosive properties.
Electrostatic Damage
Prevention