Electrical Adjustments; Tuner Section - Sony ICF-CD513 Service Manual

TUNER SECTION

[AM]
Setting:
Function : RADIO
Band switch : 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]
Setting:
Function : RADIO
Band switch : FM
FM RF signal
MAIN board
generator
TP (FM IN)
0.01 µ F
TP (FEG GND)
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
• Attention
BP1 Desoldering
(Must be short after measurement)
MAIN board
TP (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

ELECTRICAL ADJUSTMENTS

0 dB=1 µV
level meter
4 Ω
+
set
–
MAIN board
speaker terminal (CN301)
level meter
4 Ω
+
set
–
MAIN board
speaker terminal (CN301)
digital voltmeter
100 k Ω
SECTION 5
Adjust for a maximum reading on level meter
T1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
Confirmation
Adjust for a maximum reading on level meter
L3
CT2
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2
Confirmation
Adjust for a maximum reading on level meter
L1
CT1
Adjustment Location: MAIN board (See page 13)
FM VCO Adjustment
Setting:
FM RF SSG
Carrier frequency: 98 MHz
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
Procedure:
1. Connect the frequency counter to TP(ST VCO), TP(TU - +B)
on the MAIN board, as shown the figure below.
2. Tune the set to 98 MHz.
3. Adjust RV1 on the MAIN board for 76 kHz reading on the
frequency counter.
Specified Value: 75.95 to 76.05 kHz
MAIN board
TP (ST VCO)
TP (TU - +B)
Adjustment Location: MAIN board (See page 13)
– 11 –
no mark : US, Canadian models
< > : AEP model
AM IF ADJUSTMENT
530 kHz
2.65 ± 0.05 V
<531 kHz>
1,710 kHz
<8.3 ± 1.0 V>
<1,602 kHz>
AM TRACKING ADJUSTMENT
580 kHz <621 kHz>
1,490 kHz <1,404 kHz>
2.6 ± 0.05 V
87.5 MHz
108 MHz
FM TRACKING ADJUSTMENT
87.5 MHz
108 MHz
0.01 µ F
TP (FEG GND)
frequency counter
1 µ F
+
+
–
33 k Ω
450 kHz
8.8 ± 1.0 V
8.8 ± 1.0 V
MAIN board
TP (FM IN)
set