Electrical Adjustments; Tuner Section - Sony ICF-CD820 Service Manual

PRECAUTION
• Adjustment should be performed in the order given.

TUNER SECTION

[FM]
Setting:
Function switch: RADIO
BAND switch : FM
FM RF SSG
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
[AM (MW) /LW]
Setting:
Function switch: RADIO
BAND switch : MW/LW
AM RF SSG
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
4 Ω
set
speaker terminal
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
CT1
SECTION 4

ELECTRICAL ADJUSTMENTS

0 dB=1 µV
0.01 µ F
FM lead wire antenna terminal
Put the lead-wire
antenna close to
the set.
level meter
+
–
87.5 MHz
108.0 MHz
87.5 MHz
108.0 MHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
CT4
AM (MW) TRACKING ADJUSTMENT
(Except CD820L: FR)
Adjust for a maximum reading on level meter
L1 (CD820)
L1-1 (CD820L: AEP, UK)
CT3
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
CT4
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1-1
CT3
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
CT6
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1-2
CT5
NOTE:
[ ] : Italian model
• Abbreviation
FR : French model
– 9 –
455 kHz
(Except CD820L: FR)
530 kHz [526.5 kHz]
1,605 kHz [1,606.5 kHz]
600 kHz [598.5 kHz]
1,400 kHz [1,399.5 kHz]
(CD820L: FR)
160 kHz
240 kHz
(CD820L: FR)
160 kHz
240 kHz
(CD820L: AEP, UK)
145 kHz
(CD820L:AEP, UK)
160 kHz
240 kHz