Electrostatic Discharge; Device Modifications During Service; Radiation Safety - KaVo ORTHOPANTOMOGRAPH OP 3D Service Manual

3 Safety
Do not compromise:
• EMI enclosures and tightness of cases and screw contacts
• Gaskets
• Cable shields and their grounding to the chassis
• Electromagnetic immunity by incorrect cabling.

3.1.4 Electrostatic discharge

Electrostatic Discharge (ESD) can damage or destroy electronic components.
When you service the device take precautions to avoid electrostatic charge to build up
and discharge (ESD). Follow the local and national recommendations for the prevention
of ESD. If no recommendations are available, follow the guidelines below:
• Leave all new or replacement circuit boards and electrical parts in their protective
packaging until the boards are needed.
• Before handling circuit boards and electrical parts make sure that any static electricity
charge that has built up in your body is discharged.
• When examining and checking circuit boards use an antistatic wrist wrap which is
connected to a ground point through a 1 Mohm current limiting cable. Also use a cable
to connect the device to the same ground potential as the wrist wrap.
• When handling circuit boards hold them by their edges and do not touch any
components or connectors.
• If an antistatic mat is used, connect the wrist wrap to the mat and the mat to the
ground potential.
• To make sure that the wrist wrap is in good condition, check and wash it frequently.

3.1.5 Device modifications during service

CAUTION! Only authorized service technicians are allowed to service,
install and replace parts of the device.
CAUTION! Only approved spareparts supplied by the manufacturer are allowed
to be used.
CAUTION! Make sure that any modifications done to the device do not degrade
the EMC performance of the device.
• Never make unauthorized changes or modifications to the device or its parts.
• Never dismantle or remanufacture any part of the tube head assembly or beam
limiting device.
• Never adjust any part of the beam limiting device unless under the direction of the
manufacturer.
• Ensure that the EMC performance of the device is not degraded when the device is
upgraded, serviced and repaired.
NOTICE! Ensure that the EMC performance is not degraded thoughout the whole
service life of the device.

3.1.6 Radiation safety

CAUTION! When you take test exposures, take adequate precautions to protect
youself from radiation. Stand behind a suitable radiation shield that is positioned
at least two meters from the device.
10 ORTHOPANTOMOGRAPH
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OP 3D