Elenco SEE AMFM108CK - Manual (Page 6)

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SEMICONDUCTOR PARTS FAMILIARIZATION
This section will familiarize you with the proper method used to test the transistors and the diode.
TRANSISTOR TEST
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
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.