Maintenance
6-2 1705A Spectrum Monitor
detergentand water. Abrasive cleanersshould not be used. If the circuit board
assemblies must be removedfor cleaning, follow the instructions for removal/re-
placement under the heading of Corrective Maintenance.
After cleaning,allow the interior to thoroughly dry before applying power to the
instrument.
CAUTION. Donot al low water to get inside any enclosed assembly or component. Do
not clean any plastic materials with organic cleaning solvents, such as benzene,
toluene, xylene, acetone, or similar compounds, because they may damage the plastic.
After cleaning, carefully check the inst rument for defective connections,
damaged parts,and improperly seated transistors or integrated circuits. The
remedy formost visible defects is obvious; however, if heat--damagedparts are
discovered, determinethe cause of overheating before replacing the damaged
part, to preventadditional damage.
Periodic checksof the transistors and integrated circuits are not recommended.
The best measureof performance is the actual operation of the component in the
circuit.
This instrument containselectrical components that are susceptible to damage
from staticdischarge. Static voltages 1 kV to 30 kV are common in unprotected
environments. Table6--1shows the relative static discharge susceptibility of
various semiconductorclasses.
Table6- 1: StaticSusceptibility
Relative SusceptibilityLevels Vo ltag e
1CMOS 100 V --500 V
2ECL 200V -- 500 V
3SCHOTTKYSI GNAL
DIODES
250V
4SCHOTTKYTTL 500V
5HFBI POLAR TRAN-
SISTORS
400t o 600 V
6 JFETS 600 to 800 V
7LINEAR CIRCUITS 400 to 1000 V est.
8LOW POWER SCHOTT-
KYTTL
900V
9 TTL 1200V
VisualInspectionStatic-SensitiveComponents