GE HEALTHCARE CARESCAPE Monitor B450, Техническое руководство

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Disassembly and reassembly
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12 Disassembly and reassembly
12.1 Disassembly guidelines
Field repair of the patient monitor is limited to replacing Field Replaceable Units (FRUs). See
chapter
13. Service parts for a detailed list of available FRUs. Attempting a field repair on a
printed circuit board or a factory sealed component or assembly could jeopardize the safe and
effective operation of the patient monitor.
NOTE: Only a qualified service technician should perform field replacement procedures.
NOTE: Perform the checkout procedure described in chapter
10. Maintenance and checkout
each time after you have done any disassembly to the patient monitor.
12.1.1 ESD precautions
All external connectors of the patient monitor are designed with protection from ESD damage.
However if the patient monitor requires service, exposed components and assemblies inside
are susceptible to ESD damage. This includes human hands, non-ESD protected work stations
or improperly grounded test equipment. The following guidelines may not guarantee 100%
static-free workstation, but can greatly reduce the potential for failure of any electronic
assemblies being serviced:
•
Discharge any static charge you may have built up before handling semiconductors or
assemblies containing semiconductors.
• A grounded, antistatic wristband or heel strap should be worn at all times while handling
or repairing assemblies containing semiconductors.
• Use properly grounded test equipment.
• Use a static-free work surface while handling or working on assemblies containing
semiconductors.
• Do not remove semiconductors or assemblies containing semiconductors from antistatic
containers until absolutely necessary.
• Do not slide semiconductors or electrical/electronic assemblies across any surface.
• Do not touch semiconductor leads unless absolutely necessary.
• Semiconductors and electronic assemblies should be stored only in antistatic bags or
boxes.
• Handle all PCB assemblies by their edges.
• Do not flex or twist a circuit board.
WARNING Pins of connectors identified with the ESD warning symbol should not be
touched. Connections should not be made to these connectors unless
electrostatic discharge (ESD) precautions are used.
12.1.2 Reassembly precautions
Pay attention to the following generic precautions when reassembling the patient monitor:
•
Note the positions of any wires, cables or connectors. Mark them if necessary to ensure
that they are reassembled correctly.
• Save and set aside all hardware for reassembly
• GE recommends using the new fasteners (screws, washers, etc.) provided in the FRU kits
rather than reusing the old fasteners. Some fasteners are not intended to be re-used