8 HANDLING PRECAUTIONS FOR PCBs AND SOFTWARE CHIPS Chapter A: GENERAL & TECHNICAL
22 Planmeca ProOne Technical manual
8 HANDLING PRECAUTIONS FOR PCBs AND
SOFTWARE CHIPS
8.1 Handling printed circuit boards
The circuit boards are well protected against static discharges when they are in the X-ray
unit. However, some precautions are necessary when handling the boards since some
internal nodes on the PCBs can easily be damaged by static electricity. This is true
especially during low humidity conditions when there is evidently a potential risk of static
discharges.
INPROPER HANDLING MIGHT CAUSE DISTRUCTIVE DAMAGE TO THE
CIRCUIT BOARDS. WARRANTY DOES NOT COVER SUCH DAMAGES.
Follow these rules when handling PCBs or software chips:
• Grounding wrist-straps are recommended but not necessarily required when handling
the boards, as long as you first always touch a grounded exposed metal part in the X-
ray unit before touching the PCB.
• Place the removed PCB immediately in an antistatic plastic bag without landing it any-
where else in between. PCBs for warranty replacement must be returned to the factory
properly packaged in antistatic plastic bags.
• Never place a removed PCB on any surface or hand it to another person without touch-
ing the surface or the person first.
8.2 Handling EEPROM memory chips
It is strongly recommended that the software is always upgraded electronically. In the
event that this is done the “old-fashioned” way (by replacing the software chips), you can
avoid static discharge problems by following the same rules that apply for PCBs (see
above).
EEPROM (Electrically Erasable Programmable Read-Only Memory) chips must always be
stored in their specific anti-static plastic tubes which also protect them mechanically. A
mechanically damaged memory chip might also damage the mating socket on the CPU
board.
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