Electrical Adjustments; Tuner Section - Sony ICF-CD543RM Service Manual

ICF-CD543RM

TUNER SECTION

[AM]
Setting:
Function : RADIO
RADIO ON/BAND button : AM
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
MAIN board
TP (VT)
TP (AM GND)
[FM/TV/WEATHER]
Setting:
Function : RADIO
RADIO ON/BAND button: FM or TV or WEATHER
MAIN board
FM RF signal
TP (FM IN)
generator
0.01 µ F
22.5 kHz frequency
deviation by 400 Hz
MAIN board
signal
TP (FM GND)
Output level:
as low as possible
MAIN board
TP (VT)
TP (FM GND)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
• Remove FM antenna in FM adjustment.
12
SECTION 4

ELECTRICAL ADJUSTMENTS

0 dB=1 µV
MAIN board
CN371 pin 4
level meter
4.0 Ω
+
set
–
MAIN board
CN371 pin 3
digital voltmeter
100 k Ω
MAIN board
CN371 pin 4
level meter
4.0 Ω
+
set
–
MAIN board
CN371 pin 3
digital voltmeter
100 k Ω
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
RV1
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2 530 kHz
1,710 kHz
Confirmation
(1,602 kHz)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
FM/TV (2 – 6 CH) VCO VOLTAGE CONFIRMATION (US model)
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 108 MHz
Confirmation TV 2 ch
FM/TV (2 – 6 CH) TRACKING ADJUSTMENT (US model)
Adjust for a maximum reading on level meter
L3
CT2
TV (7 – 13 CH)/WEATHER (1 – 7 CH)
VCO VOLTAGE CONFIRMATION (US model)
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation TV 13 ch
Confirmation WEATHER 2 ch
TV (7 – 13 CH)/WEATHER (1 – 7 CH)
TRACKING ADJUSTMENT (US model)
Adjust for a maximum reading on level meter
L4
CT3
FM VCO VOLTAGE CONFIRMATION (Canadian, AEP models)
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 87.5 MHz
Confirmation 108.0 MHz
FM TRACKING ADJUSTMENT (Canadian, AEP models)
Adjust for a maximum reading on level meter
L3
CT2
Adjustment Location: MAIN board (See page 14)
( ): AEP model
1,000 kHz (999 kHz)
( ): AEP model
2.3 ± 0.05 V
9.3 ± 2.0 V
(8.6 ± 1.5 V)
( ): AEP model
580 kHz (621 kHz)
1,490 kHz (1,395 kHz)
14.2 ± 2.0 V
2.2 ± 0.4 V
TV 2 ch
108 MHz
9.2 ± 1.5 V
4.2 ± 0.5 V
WEATHER 2 ch
TV 13 ch
2.5 ± 0.4 V
9.0 ± 2.0 V
87.5 MHz
108 MHz