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Maintenance
SPG 422 Service Manual (B034000 and above)
6–3
Interior. The best way to remove accumulated dust inside the instrument is to
blow it off with dry, low-velocity air. Remove remaining dust with a small paint
brush, followed by a soft cloth dampened in a mild detergent and water solution.
CAUTION.
Do not allow water to get inside any enclosed assembly or component.
Visually inspect the instrument during the preventive maintenance routine for
signs of damage, scorched components, and loose or disconnected pin connec-
tors. If you discover heat damaged parts, try to determine the cause of the
overheating; otherwise, the damage may repeat.
Periodic checks of the transistors and integrated circuits are not recommended.
The best measure of performance is the actual operation of the component in the
circuit.
This instrument contains electrical components that are susceptible to damage or
degradation from static discharge. See Table 6–1 for relative susceptibility of
various classes of semiconductors. Higher static discharge voltages than the
levels listed in Table 6–1 can degrade the performance and reliability of the
semiconductor components. Static voltages of 1 kV to 30 kV are common in
unprotected environments.
CAUTION.
Static discharge can damage or degrade many semiconductor
components.
Table 6–1: Relative susceptibility levels
Semiconductor classes
Relative susceptibility levels
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
MOS or CMOS microcircuits or discrete or linear mi-
crocircuits with MOS inputs (most sensitive)
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
100 to 500 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
EL, 74F, 74ALS, and 155- P/N parts
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
200 to 500 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Schottky signal diodes
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
250 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Schottky TTL
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
500 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
High-frequency bipolar transistors & ICs
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
400 to 600 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
JFETs
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
600 to 800 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Low-frequency linear microcircuits
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
400 to 1000 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Low-power Schottky TTL
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
900 V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
TTL (least sensitive)
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
1200 V
Visual Inspection
Static-Sensitive
Components
Summary of Contents for SPG 422
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