Sony CDX-4250 Service Manual page 17

AM Auto Scan/Stop Level Adjustment
Setting:
SOURCE n MODE button
D-BASS switch
Frequency Select switch (E model) : AM 10K
AM RF signal
dummy
generator
antenna
30 Ω 15 pF
30 pF
Carrier frequency : 1000 kHz
30% amplitude
modulation by
1 kHz signal
output level : 33 dB (44.7 µV)
Adjustment Location: tuner unit (TU01)
– tuner unit (TU01) (component side) –
AM AUTO
SCAN/STOP
LEVEL ADJ
– tuner unit (TU01) (conductor side) –
: AM
: OFF
antenna
terminal
4 Ω
set
SPEAKER OUT
AM SENS
IFT3
IFT3
IFT4
FM CENTER
ADJ
S-METER OUT
level
meter
Procedure:
+
1. Adjust IFT3 on TU01 so that the reading on the digital
–
voltmeter is 1.5 ± 0.2 V.
Adjustment Location: tuner unit (TU01)
ADJ
IFT1
FEB1
FM SENS/IF
ADJ
IC1
R24
S-METER
OUT
– 17 –
digital
voltmeter
+
–
'
FM CENTER
OUT
'