Furuno FR-8111, FR-8251 manual Chapter MAINTENANCE, Danger!-Electrical Shock Hazard

Chapter 3

MAINTENANCE

Danger!-Electrical Shock Hazard

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)

•Modulator circuit and magnetron (Antenna unit )

•Motor drive circuit (Antenna unit)

When Working on the Antenna Unit

Wear a safety belt and a hard hat when working on the antenna unit. Always make sure that the radar is POWERED OFF and the Antenna Switch in the display unit is OFF before working on the antenna unit. Also take all steps to ensure that the radar will not be accidentally operated by someone else, to prevent the potential risk of being struck by the rotating antenna and exposure to RF radiation hazards.

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.

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