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5. PREVENTIVE MAINTENA~CE
These are the precautions on preventive maintenance which will
protect the instrument from trouble and keep it clean for
a
long
time.
5-1 Cleaning
Since the extent of instrument smearing depends on the
ambient condition in which the oscilloscope is used, the
frequjncy
of
the cleaning operations cannot be defined
initially.
Cleaning should be accomplished as required.
Dust deposited inside the instrument affects the normal
flow of cooling air and invites the local overheating of
components parts
of
results in trouble.
Smeared switch contacts of connector pins can be the cause
of defective contact, and smearing of the circuit can cause
arcing between circuits, particularly in moist season.
Cleaning agents recommended and those prohibited are listed
as below.
Recornrne~ded agent
Alcohol, gasoline of keroscene
Prohibited agent
I
I
I
Acetone, tri-ethyl-ketone
lacquer thinner or agent
containing ketone series so L
vent
Cleaning the c~ver
Normal sruedriGg of the cover can be cleaned by washing
the cover with a neutral chemical cleaner.
For greasy
smearing, use a recommended agent with a soft cloth.
Front and other panels.
Clean the smeared panel with a soft cloth moistened with
a recommended agent.
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