Read Sony ICF-CD830 / ICF-CD830L Service Manual online
9
ICF-CD830/CD830L
SECTION 4
ELECTRICAL ADJUSTMENTS
FM VCO Adjustment
Procedure:
FM RF signal
generator
generator
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.1 V (100 dB)
Modulation: no modulation
Output level: 0.1 V (100 dB)
0.01
µ
F
FM lead wire antenna terminal
Connection:
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT (CD830)
Adjust for a maximum reading on level meter
L4
515 kHz (516.5 kHz)
CT4
1,750 kHz (1,631.5 kHz)
AM TRACKING ADJUSTMENT (CD830)
Adjust for a maximum reading on level meter
L1
600 kHz
CT1
1,400 kHz
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
86.5 MHz (87.35 MHz)
CT3
109.5 MHz (108.25 MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
86.5 MHz (87.35 MHz)
CT2
109.5 MHz (108.25 MHz)
PRECAUTION
• Adjustment should be performed in the order given.
[FM]
Setting:
Function switch : RADIO
BAND switch
Function switch : RADIO
BAND switch
: FM
[AM (MW/LW) ]
Setting:
Function switch : RADIO
BAND switch
Function switch : RADIO
BAND switch
: AM (MW/LW)
AM RF signal
generator
generator
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
400 Hz signal.
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
75 kHz frequency deviation
by 1 kHz signal.
Output level: as low as possible
by 1 kHz signal.
Output level: as low as possible
0.01
µ
F
FM lead wire antenna terminal
TUNER SECTION
0 dB=1 µV
Frequency counter
75,950 – 76,050 Hz
IC1 Pin
4
+
–
–
frequency counter
33 k
Ω
MAIN Board
IC1 Pin
7
LW FREQUENCY COVERAGE ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
CT6
145 kHz
LW TRACKING ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L1-2
160 kHz
CT5
240 kHz
1. Connect the frequency counter to 4 and 7 pins of IC1 as shown
the figure right.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz reading on frequency counter.
3. Adjust RV1 for 76 kHz reading on frequency counter.
Specification Value:
MW FREQUENCY COVERAGE ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L4
515 kHz
CT4
1,750 kHz
MW TRACKING ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L1-1
600 kHz
CT1
1,400 kHz
level meter
set
SPEAKER OUT
4
Ω
+
–
–
( ) : AEP Model
Adjustment Location:
[MAIN BOARD] (Component Side)
L3
T1
AM IF
Adjustment
AM IF
Adjustment
CT3
CT2
L2
FM Traking
Adjustment
FM Traking
Adjustment
L3
FM Frequency
Coverage
Adjustment
FM Frequency
Coverage
Adjustment
L4
CT4
AM Frequency
Coverage Adjustment
MW Frequency
Coverage Adjustment
AM Frequency
Coverage Adjustment
MW Frequency
Coverage Adjustment
CT6
LW Frequency
Coverage
Adjustment
LW Frequency
Coverage
Adjustment
L1, L1-1
AM Tracking Adjustment
MW Tracking Adjustment
AM Tracking Adjustment
MW Tracking Adjustment
CT5
LW Traking Adjustment
LW Traking Adjustment
L1-2
LW Traking Adjustment
LW Traking Adjustment
CT1
AM Tracking Adjustment
MW Tracking Adjustment
AM Tracking Adjustment
MW Tracking Adjustment
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