Static Measurements - Elenco Electronics AM/FM-108CK Assembly And Instruction Manual

STATIC MEASUREMENTS

Amps COM V/Ω
TP15
Figure 29
FM VOLTAGE
Connect your VOM as shown in Figure 29. Switch the
AM/FM switch to the FM position. Set your VOM to
read 9 volts DC. Turn the power ON. The voltage at this
TRANSISTOR CURRENT TEST
Amps COM V/Ω
TP15
Figure 30
Connect your VOM to the circuit as shown in Figure 30.
Turn the power ON. The voltage at the emitter of Q6
should be about .7 volts. Record the voltage here:
V(Q6) = __________.
Turn the power OFF. If your answer is greater than 2
volts, check R20, R21, R22, R24, Q6 and the battery.
Since the current through resistor R22 is equal to the
IF YOU DO NOT HAVE AN RF GENERATOR OR OSCILLOSCOPE,
V
V
SKIP TO THE RATIO DETECTOR ALIGNMENT PROCEDURE.
point should be between 7 and 9 volts. Turn the power
OFF. If you do not get this reading, check R25, C24 and
the battery voltage.
current through transistor Q6, calculate the current
through Q6 as follows:
Current (I) = V(Q6) / R22
Your calculated answer should be between .0005 amps
(.5 milliamps) and .0011 amps (1.1 milliamps).
Current (I) = __________.
-35-
Battery