Electrical Adjustments; Tuner Section - Sony ICF-CD553RM Service Manual

TUNER SECTION

[AM]
Setting:
Function: RADIO
Band: 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
[FM/TV/WEATHER]
Setting:
Function: RADIO
Band: FM/TV/WEATHER
TUNER board
FM RF signal
TP (ANT)
generator
0.01 µ F
75 kHz frequency
deviation by 1 kHz
TUNER board
signal
TP (GND)
Output level:
as low as possible
TUNER board
TP (VT)
TP (GND)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
SECTION 5

ELECTRICAL ADJUSTMENTS

0 dB=1 µV
AMP board
CN301 pin 1
level meter
6 Ω
+
set
–
AMP board
CN301 pin 2
AMP board
CN301 pin 1
level meter
6 Ω
+
set
–
AMP board
CN301 pin 2
digital voltmeter
100 k Ω
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L6 530 kHz
Confirmation 1,710 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L5
CT5
FM/TV/WEATHER IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
FM/TV (2 – 6 CH) VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4 TV 2 ch
CT3 108 MHz
FM/TV (2 – 6 CH) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
Confirmation
TV (7 – 13 CH)/WEATHER (1 – 7 CH) VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L3 WEATHER 2 ch
CT4 TV 13 ch
TV (7 – 13 CH)/WEATHER (1 – 7 CH) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT2
Adjustment and Connecting Location: TUNER board
ICF-CD553RM
450 kHz
1.0 ± 0.05 V
5.3 ± 0.7 V
580 kHz
1,490 kHz
10.7 MHz
0.55 ± 0.15 V
4.5 ± 0.15 V
TV 2 ch
108 MHz
1.2 ± 0.15 V
4.1 ± 0.15 V
WEATHER 2 ch
TV 13 ch
(See page 12)
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