Elenco AM/FM Radio Kit - Manual (Page 18)

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Figure 14
STATIC MEASUREMENTS
POWER TEST
Set your VOM (Volt-Ohm-Millimeter) to read 2 amps
DC. Connect the meter to the circuit as shown in
Figure 13. Make sure that the volume control is in the
OFF position (turned fully counter-clockwise). While
watching you VOM, turn the volume to the ON position
(rotate clockwise until a “click” is heard). The VOM
should indicate a very low current. Adjust your meter
for a more accurate reading if necessary. If the current is greater than 20 milliamps, immediately turn the
power OFF. The current should be less than 10
milliamps. This is the current drawn by the battery
when no input signal is present (the “idle current”).
Turn OFF the power. If your circuit fails this test, check
that all of the parts have been installed correctly, and
check for shorts or poor solder connections.
OUTPUT BIAS TEST
Put the battery into the holder.
–
+
+
–
Figure 13
GND
TP17
Remove IC from socket and install transistor audio amplifier PC board on the same socket.