Maintenance
6-14 2715 Spectrum Analyzer Service Manual
Surface Mounted Components. Surface mounted components areused in this
instrument. These components are mounted on pads on the circuit board, rather
than through holes in the board. (In somerare instances, components may be
mounted on pads around through holes.) Leadconfigurations of these compo-
nents are shown in Figure 6--3.
2
Anode
Anode
Cathode
Transistor
Diode
1
PinNumber
SequencePath
HighestPin
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 electrolyticcapacitor is identified by a band. Other
capacitors and resistors haveno visible identification.
Surface mounted semiconductor devicesare sensitive to static electricity
discharges and should betreated as outlined in the beginning of this section.
A hot air machine, such as HartModel 200A manufactured by Nu-Concept
Systems Incorporated of Colmar,P ennsylvania,is recommended for unsoldering
and soldering surfacemounted components.
Table6 --3 lists tools that are suitable for servicing circuit boards with surface
mounted components.
Do not apply too much heat or pull hard on thecomponents, as the pads on
which the device is soldered may be lifted from the circuitboard.
Replacing SurfaceMounted Components