Static Measurements - Elenco Electronics AM/FM-108TK Manual

STATIC MEASUREMENTS
POWER TEST
For
all measurements, connect your equipment GND to
circuit GND
TP15.
Set your VOM (Volt-Ohm-Millimeter)
to read 2 amps DC. Connect the meter to the circuit
as
shown in Figure
3.
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
OUTPUT BIAS TEST
Put
the batterY into the holder.
meter
for
a
more accurate reading if necessary.
11
current is greater than 20 milliamps, immediately
the power
OFF. The
current should
be less
that
milliamps. This is the current drawn by the
ba
when no input signal is
present
(the "idle current").
OFF
the power. lf your circuit fails this test, check
all of
the parts have been installed correctly, and
cl
for
shorts or poor solder connections'
ra
P3
?l
ff
K
. .';.
O
Ia
-1
r0
r+
{-
o'
Figure
4