Semiconductor Parts Familiarization; Transistor Test; Diode Test - Elenco Electronics AM/FM-108TK Assembly And Instruction Manual

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 a NPN transistor. Refer
the Figure C (page 7) 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 1MΩ to infinity.
Low Resistance
Ω
Ω
NPN
COM
EBC
TEST A

DIODE TEST

Refer to the parts list and find a diode. Refer to Figure E
(page 7) for locating the Cathode and Anode. The end
with the band is the cathode. Using an Ohmmeter,
connect the diode as shown in Test E. Your meter
should be reading a low resistance.
High Resistance
Ω
Ω
NPN
COM
EBC
TEST B
Using an
Low Resistance
Ω
Ω
COM
Diode
TEST E
Refer to parts list and find a PNP transistor, refer to
Figure D (page 7) for locating the Emitter, Base and
Collector. Using an Ohmmeter, connect the transistor
as shown in Test C. 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 D. 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.
Low Resistance
Ω
Ω
PNP
COM
EBC
TEST C
Ohmmeter, connect the diode as shown in Test F. Your
meter should be reading a high resistance. Typical
results read approximately 1MΩ to infinity for silicon
diodes (1N4148).
High Resistance
Ω
Ω
COM
Diode
TEST F
-5-
High Resistance
Ω
Ω
PNP
COM
EBC
TEST D