Furuno FR-8111 Chapter TROUBLESHOOTING, Simple Troubleshooting, Danger!-Electrical Shock Hazard

Chapter 4

TROUBLESHOOTING

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 and separate power supply units)

•CRT circuit (Display unit)

•Modulator circuit and magnetron (Antenna unit or separate transceiver 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.

4.1 Simple Troubleshooting

This paragraph describes how to cure operational problems, by observing the radar picture and using operator controls and touchpad keys without opening the display unit, antenna unit or other equipment units.

The table below shows user-level troubleshooting procedures.

Problem	Remedy
No own ship mark	On the R-type radar, check that SHP GRPH ON is selected at
	the INITAL menu, referrring to paragraph 1.24. The own ship
	mark is not available on the N-type radar.

4-1