ICF-CD831, ICF-CD831L - Sony Audio Service Manual (repair manual). Page 11

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11
ICF-CD831/CD831L
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT3
CD831
: 86.5 MHz
CD831
: 109.5 MHz
CD831L : 87.35 MHz
CD831L : 108.25 MHz
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
CD831
: 86.5 MHz
CD831
: 109.5 MHz
CD831L : 87.35 MHz
CD831L : 108.25 MHz
AM/MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM/MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
CD831
: 520 kHz
CD831
: 1,750 kHz
CD831L : 516.5 kHz
CD831L : 1,631.5 kHz
AM/MW TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
CD831: L1, CD831L: L1-1
CT1
600 kHz
1,400 kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT5
145 kHz
261 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-2
CT6
160 kHz
240 kHz

Adjustment Location: See page 12.
digital
voltmeter
100 k
Ω
TP (VT)
speaker terminal
set
16 
Ω
level meter
(range: 0.5—5 V ac)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
FM lead wire
antenna terminal
FM RF signal
generator
0.01 F
set
  TUNER SECTION     0 dB = 1 µV
• FM Section

Setting:
BAND switch: FM
VOLUME control: MIN
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section

Setting:
BAND switch: MW or LW
VOLUME control: MIN
30% amplitude
modulation by
400 Hz signal
• Connecting Level Meter (FM, MW and LW)
• Connecting Digital Voltmeter (FM, MW and LW)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
SECTION 4
ELECTRICAL ADJUSTMENTS

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