GE Medical Systems marquette Dash 2000, Service Manual, Page: 85 / 202

TROUBLESHOOTING: Special Components
Revision A DASH 2000 Patient Monitor 4-3
2000 412-001
Special Components
Surface Mounted
Devices Surface mounted devices are used to aid in miniaturizing the electrical/
electronic assemblies within the monitor.
Surface mounted integrated circuits have legs that are soldered to
rectangular pads on the surface of the printed circuit board (PCB),
versus pin-through devices having legs that are made to be inserted into
solder fillets protruding completely through a PCB. Surface mounted
integrated circuits (ICs, SMD, PLCC) may have legs on either two or four
sides of the IC. Another surface mounted technology are Ball Grid Array
ICs (BGA) using soldering balls as electrical connections on the bottom of
the components.
Surface mounted resistors, capacitors, and diodes have conductive parts
acting as legs that are directly soldered to the PCB.
WARNING
Surface mounted components were not designed to be
removed or replaced using standard soldering
equipment. Removal of surface mounted components
using a conventional soldering iron can potentially
destroy the PCB. Only soldering workstations specifically
designed for surface mount technology may be used to
remove and replace these type of components.