Handling Precautions For Pcbs And Software Chips; Handling Printed Circuit Boards; Handling Software Flash Memory Chips - Planmeca ProOne Technical Manual

HANDLING PRECAUTIONS FOR PCBS
AND SOFTWARE CHIPS
6 HANDLING PRECAUTIONS FOR PCBs AND
SOFTWARE CHIPS
6.1

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.
WARNING
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.
6.2

Handling software flash 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).
Software flash memory chips must always be stored in their specific anti-static plastic
tubes which also protect them mechanically. A mechanically damaged chip might also
damage the mating socket on the CPU board.
Since the software chips are of PLCC-type (plastic leadless chip carrier), they must be
removed only by using a proper extracting tool (see spare part manual for details). Using
any other tool for removal can seriously damage the sockets on the CPU board.
Technical Manual
GENERAL & TECHNICAL DATA
Planmeca ProOne A-13
CHAPTER A