Section 6 Maintenance; Static-Sensitive Components; Relative Susceptibility To Static-Discharge Damage - Tektronix 2336YA Instruction Manual

Section 6-2336 Service
MAINTENANCE
This section of the manual contains information for conducting preventive maintenance, troubleshooting, and corrective
maintenance on the 2336 Oscilloscope.
STATIC-SENSITIVE COMPONENTS
The following precautions are applicable when per-
forming any maintenance involving internal access t o the
instrument.
C A U T I O N
Static discharge can damage any semiconductor
component in this instrument.
-
This instrument contains electrical components that are
susceptible to damage from static discharge. Table 6-1
l i s t s the relative susceptibility of various classes of semi-
conductors. Static voltages of 1 k V t o 30 kV are common
in unprotected environments.
When performing maintenance observe the following
precautions to avoid component damage:
1. Minimize handling of static-sensitive components.
2. Transport and store static-sensitive components or
assemblies in their original containers or on a metal rail.
Label any package that contains static-sensitive components
or assemblies.
3.
Discharge the static voltage from your body by
wearing a grounded antistatic wrist strap while handling
these components. Servicing static-sensitive components or
assemblies should be performed only at a static-free work
station by qualified service personnel.
4. Nothing capable of generating or holding a static
charge should be allowed on the work station surface.
5.
Keep the component leads shorted together whenever
possible.
6. Pick up components by their bodies, never by their
leads.
Table 6-1
Relative Susceptibility to
Static-Discharge Damage
Semiconductor Classes
Relative
Susceptibilitj
Levelsa
VlOS or CMOS microcircuits or
Jiscretes, or linear microcircuits with
VlOS inputs (Most Sensitive)
ECL
Schottky signal diodes
Schottky TTL
Y igh-frequency bipolar transistors
Linear microcircuits
Low-power Schottky TTL
TT L (Least Sensitive)
a ~ o l t a g e equivalent for levels (voltage discharged from a 100-pF
capacitor through a resistance o f 1 0 0
a ) :