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3-4.
SIF Adjustment
(1) Input the following signal conditions to the IC301 Pin48
(TP1).
(FM/SG)
CARRIER
4.5MHz
LEVEL
90dBµ
MOD
OFF
(2) Adjust L207 so that the voltage at IC301 Pin1 (TP21) becomes
4.5V ± 0.3VDC.
(Simple Adjustment Method)
(1) Connect an oscilloscope to IC301 Pin1 (TP21), then receive
a television broadcast.
(2) Adjust L207 so that the center of audio signal level becomes
4.5V.
4.5V
5V
0V
3-5.
TRAP Adjustment
(1) Make connections as shown in figure below.
TU 101 Pin ! (TP2)
ATT
LSW-480
ALIGNMENT
VIF
SCOPE
<IF DETECTOR>
TO ALIGNMENT
SCOPE
GERMANIUM DIODE: ISS-188 FM...etc.
Q201
COLLECTOR
DC POWER
SUPPLY
IF
DETECTOR
FROM Q201
Ge DIODE 1000pF
COLLECTOR
DO AS SHORT
Ge
1000pF
AS IT CAN
DIODE
IF DETECTOR
DC POWER
SUPPLY
4.6V
(2) Adjust L201 so that center section (a section in the figure
below) of the ALIGNMENT SCOPE waveform becomes
60.25 MHz ± 50 kHz.
34
a
60.25MHz
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