CVS-841/851
Preface
Safety Precautions
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High Voltage
High voltages are used in the transmitter section which could be life threatening. A protection cover with
the words
Danger High Voltage
is provided in this section but wait 10 minutes before inspecting inside.
Even if the power switch is turned off, residual voltages may remain in the capacitors inside the unit.
Before inspection or replacement of parts, discharge this residual voltage in a safe and correct manner.
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Disconnect Main Power
It is still possible to receive an electric shock caused by unintentionally switching on the power during
repair work. To prevent this from happening, make sure to completely disconnect the unit from the
ship’s main supply before attempting any inspection.
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Dust
Dust can accumulate inside after long periods of use. Allergies can result from the inhalation of this dust,
therefore during inspection and cleaning it is advisable to use a mask.
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Static Electricity
Static sensitive semiconductor devices are used in this unit. Before changing the printed boards be
careful not to damage any of these devices due to electrostatic build up from carpet, clothes, seats, etc
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Display Front Plate
A glass plate is used in front of the Liquid Crystal Display in the CVS-841 sounder unit. The glass is
vulnerable against mechanical impact. Use the utmost care when handling this unit, not to apply
mechanical shock to this part. In the CVS-851 sounder unit, a plastic plate is used for the same
purpose, which is stronger than the glass, however, the same caution should be taken.
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Liquid Crystal Display
A Liquid Crystal Display contains mercury, which is harmful to the human body when touched. When
you attempt to discard this device, follow the proper disposal procedures.
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