Elenco SEE AMFM108CK - Manual (Page 16)

STATIC MEASUREMENTS
AGC ZERO SIGNAL BIAS
With the power turned OFF, connect your VOM to TP5 as shown in Figure 13. Make sure that the AM/FM switch
is in the AM position.
Check that the VOM is adjusted to
read 9 volts DC and turn the power
ON. The voltmeter should read
approximately 1.5 volts DC. If your
reading varies by more than .5 volts
from this value, turn the power OFF
and check the polarity of D4. Also
check R36 and R35 and check that
transformer T6 is properly installed.
T8 TEST
-15-
ASSEMBLY INSTRUCTIONS
C34 - 100 μ F Lytic
(see Figure B)
T6 - AM IF Coil
(Yellow Dot)
R35 - 27k
Ω
Resistor
(red-violet-orange-gold)
TP5 - Test Point Pin
(see Figure A)
C32 - 10
μ
F Lytic
(see Figure B)
R36 - 3.3k
Ω
Resistor
(orange-orange-red-gold)
C33 - .02
μ
F Discap (203)
or .022 μ F Discap (223)
R38 - 100 Ω Resistor
(brown-black-brown-gold)
TP3 - Test Point Pin
(see Figure A)
T8 - AM IF Coil
(Black Dot)
D4 - 1N4148 Diode
(see Figure D)
C38 - .01
μ
F Discap (103)
R42 - 2.2k
Ω
Resistor
(red-red-red-gold)
TP15
V
COM V
If you do not have an RF generator, skip to Section 3.
With the power turned OFF, connect the positive lead
of the VOM to TP3 and the negative lead to ground
pin TP15. Make sure that the VOM is set to read 9
volts DC and turn the power ON. The voltage on the VOM should be the same as your battery voltage or
power supply voltage. If not, turn the power OFF and
check that T8 is properly installed. Turn the power
OFF.
Figure 13