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6-14
2715 Spectrum Analyzer Service Manual
Surface Mounted Components. Surface mounted components are used in this
instrument. These components are mounted on pads on the circuit board, rather
than through holes in the board. (In some rare instances, components may be
mounted on pads around through holes.) Lead configurations of these compo-
nents are shown in Figure 6--3.
2
Anode
Anode
Cathode
Transistor
Diode
1
Pin Number
Sequence Path
Highest Pin
Number
Index
B
C
E
Cathode
Cathode
Anode
Diode
Source
Drain
Gate
FET
B
E
C
Transistor
C
8
6
IC
7
5
1
3
4
Figure 6- 3: Surface Mounted Components Lead Configuration
The positive end of an electrolytic capacitor is identified by a band. Other
capacitors and resistors have no visible identification.
Surface mounted semiconductor devices are sensitive to static electricity
discharges and should be treated as outlined in the beginning of this section.
A hot air machine, such as Hart Model 200A manufactured by Nu-Concept
Systems Incorporated of Colmar, Pennsylvania, is recommended for unsoldering
and soldering surface mounted components.
Table 6 --3 lists tools that are suitable for servicing circuit boards with surface
mounted components.
Do not apply too much heat or pull hard on the components, as the pads on
which the device is soldered may be lifted from the circuit board.
Replacing Surface
Mounted Components