Elenco AM Radio Kit - Manual (Page 8)

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TEST C TEST D
High Resistance
Diode
Low Resistance
Diode
Ω
Ω COM
Ω
Ω COM
TEST A TEST B
Low Resistance
NPN
EBC
High Resistance
NPN
EBC
Ω
Ω COM
Ω
Ω COM
SEMICONDUCTOR PARTS FAMILIARIZATION
This section will familiarize you with the proper method used to test the transistors and the diode.
TRANSISTOR TEST
Refer to the parts list and find transistors. These are
NPN transistors. Refer to Test A for locating the
Emitter, Base and Collector. Using an Ohmmeter,
connect the transistor as shown in Test A. Your meter
should be reading a low resistance. Switch the lead
from the Emitter to the Collector. Your meter should
again be reading a low resistance. Using an Ohmmeter, connect the transistor as shown
in Test B. Your meter should be reading a high
resistance. Switch the lead from the Emitter to the
Collector. Your meter should again be reading a high
resistance. Typical results read approximately 1M
Ω
to infinity.
DIODE TEST
Refer to the parts list and find a diode. This is a
silicon 1N4148 diode. Refer to Test C for locating the
Cathode and Anode. The end with the band is the
cathode. Using an Ohmmeter, connect the diode as
shown in Test C. Your meter should be reading a low resistance. Using an Ohmmeter, connect the diode
as shown in Test D. Your meter should be reading a
high resistance. Typical results read approximately
1M
Ω to infinity.