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1-1-3. Product safety notices:
Some electrical and mechanical parts have special safety related characteristics
which are often not evident from visual inspection. The protection they give
may not be obtained by replacing them with components rated for higher volt-
age,wattage,etc. Parts that have special safety characteristics are identified by
△
on schematics and parts lists.
A substitute replacement that does not have the same safety characteristics
as the recommended replacement part might create shock, fire and or other
hazards. Product safety is under review continuously and new instructions
whenever appropriate.
1-2. Servicing Precautions
WARNING 1 : First read the "Safety Precaution" section of this manual. if
unforeseen circumstances create conflict between the servicing
precautions and safety precautions,always follow the safety
precautions.
WARNING 2 : A High Voltage volume replaced in the wrong direction may
cause excessive X-ray emissions.
WARNING 3 : An electrolytic capacitor installed with the wrong polarity might
explode.
1) Servicing precautions are printed on the chassis, and should be followed
closely
2) Always unplug the units AC power cord from the AC power source before
attempting to :(a) remove or reinstall any component or assembly, (b)
disconnect PCB plugs or connectors,(c) connect all test components in
parallel with an electrolytic capacitor.
3) after servicing, always check that the screws, components and wiring have
been correctly reinstalled. Make sure that the area around the serviced
part has not been damaged.
4) Check the insulation between the blades of the AC plug and accessible
conductive parts(examples:metal panels,input terminals and earphone jacks).
5) Never defeat any of the +B voltage interlocks. Do not apply AC power to
the unit(or any of its assemblies) unless all solid-state heat sinks are
correctly installed.
6) Always connect a test instruments ground lead to the instrument chassis
ground before connecting the lead; always remove the instruments lead last.
