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Chapter 2
MAINTENANCE
Periodic checks and maintenance are important for proper operation of any electronic systems. This
chapter contains maintenance instructions to be followed to obtain optimum performance and the
longest possible life of the equipment.
This equipment contains high voltages which can endanger human life at several
internal circuits including a cathode ray tube (CRT) which uses several thousands
volts. Any internal adjustment, servicing and repair shall only be performed by
qualified service personnel totally familiar with electrical circuits and servicing of
the equipment. A residual charge remains in capacitors and other devices several
minutes after turning off the power. It is therefore essential to wait at least 3 min-
utes to allow residual charge to subside before accessing the inside of the equip-
ment. Special care must be taken when approaching the following parts:
• Power supply circuit (Display unit)
• CRT circuit (Display unit)
2.1 Periodic Maintenance Schedule
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2 – 1
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