Maintenance
7–2
ECO 422
Under high humidity conditions, accumulated dust can also provide an electrical
conduction path.
CAUTION.
Avoid the use of chemical cleaning agents that might damage the
plastics used in the instrument. Avoid using organic cleaning solutions such as
benzene, toluene, xylene, acetone, freon, or other halogenated hydrocarbon
solvents. Use a nonresidue-type of cleaner, preferably isopropyl alcohol.
Exterior. Remove accumulated dust with a soft cloth or small paint brush. The
brush is particularly useful around the connectors and front-panel buttons.
Remove hardened dirt with a soft cloth, dampened in a mild detergent and water
solution. Do not use abrasive cleaners.
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 before replacing the damaged parts; 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.
CAUTION.
Static discharge can damage or degrade many semiconductor
components.
This instrument contains electrical components that are susceptible to damage or
degradation from static discharge. See Table 7–1 for relative susceptibility of
various classes of semiconductors. Higher static discharge voltages than the
levels listed in Table 7–1 can degrade the performance and reliability of the
semiconductor components. Static voltages of 1 kV to 30 kV are common in
unprotected environments.
Visual Inspection
Static-Sensitive
Components
Summary of Contents for ECO 422
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Page 14: ...General Safety Summary viii ECO 422 ...
Page 16: ...Service Safety Summary x ECO 422 ...
Page 17: ...Getting Started ...
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Page 31: ...Operating Basics ...
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Page 41: ...Operating Basics ECO 422 2 9 Figure 2 6 Setup for Adjusting R265 the User Level for SX 7 ...
Page 43: ...Specifications ...
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Page 53: ...Theory of Operation ...
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Page 62: ...Theory of Operation 4 8 ECO 422 ...
Page 63: ...Performance Verification ...
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Page 84: ...Performance Verification 5 20 ECO 422 ...
Page 85: ...Adjustment Procedure ...
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Page 88: ...Adjustment Procedure 6 2 ECO 422 ...
Page 89: ...Maintenance ...
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Page 101: ...Options ...
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Page 104: ...Options 8 2 ECO 422 ...
Page 105: ...Replaceable Electrical Parts ...
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Page 141: ...Diagrams Circuit Board Illustrations ...
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Page 147: ... ECO 422 Changeover Unit FRONT PANEL 1 ...
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Page 167: ...Replaceable Mechanical Parts ...
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Page 176: ...ECO 422 A1 FIG 1 EXPLODED VIEW A2 A3 A4 ...
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