Sony ICF-CD853 / ICF-CD853L Service Manual ▷ View online
ICF-CD853/CD853L
8
3-6.
CD BLOCK
3-7.
OPTICAL PICK-UP DEVICE
(KSS-213R)
(KSS-213R)
3
vibration proof (green)
3
vibration proof (green)
3
vibration proof (red)
3
vibration proof (red)
1
three screws
(2.6
(2.6
×
10)
1
screw (2.6
×
10)
4
CD block
2
4
two screws (M2)
3
gear (B)
6
sled shaft
7
flexible flat cable (16core) (CNP701)
8
optical pick-up device
(KSS-213R)
(KSS-213R)
5
1
two claws
1
two claws
2
CD cover
9
ICF-CD853/CD853L
MW VCO VOLTAGE ADJUSTMENT (CD853L)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
531 kHz
2.7
± 0.05 V
Confirmation
1602 kHz
9.5
± 1.5 V
LW VCO VOLTAGE ADJUSTMENT (CD853L)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
CT4
279 kHz
9.0
± 0.05 V
Confirmation
153 kHz
2.35
± 1.0 V
MW TRACKING ADJUSTMENT (CD853L)
Adjust for a maximum reading on level meter
L3-1
621 kHz
CT2
1404 kHz
LW TRACKING ADJUSTMENT (CD853L)
Adjust for a maximum reading on level meter
L3-2
162 kHz
CT3
243 kHz
FM VCO VOLTAGE CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
87.5 MHz
3.2
± 0.5 V
Confirmation
108 MHz
10.3
± 1.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment Location: MAIN board (See page 10)
TUNER SECTION
0 dB=1
µ
V
[AM (MW/LW)]
Setting:
Function : RADIO
RADIO BAND button : AM or MW or LW
Function : RADIO
RADIO BAND button : AM or MW or LW
[FM]
Setting:
Function : RADIO
RADIO BAND button: FM
Function : RADIO
RADIO BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM antenna in FM adjustment.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
4.0
Ω
MAIN board
CN303 pin
CN303 pin
3
MAIN board
CN303 pin
CN303 pin
4
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level:
as low as possible
deviation by 400 Hz
signal
Output level:
as low as possible
+
–
–
level meter
MAIN board
CN303 pin
CN303 pin
3
MAIN board
CN303 pin
CN303 pin
4
set
4.0
Ω
0.01
µ
F
MAIN board
TP (GND)
TP (GND)
MAIN board
TP (FM IN)
TP (FM IN)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
MAIN board
SECTION 4
ELECTRICAL ADJUSTMENTS
FM STEREO ADJUSTMENT
Setting:
Function: RADIO
RADIO BAND button: FM
Function: RADIO
RADIO BAND button: FM
1. Connect the frequency counter to TP (FMST) and TP (RA-
DIO +B) as shown the figure below.
2. Tune the set to 87.5 MHz (98 MHz).
3. Adjust RV1 for 75.95 to 76.05 kHz reading on the frequency
3. Adjust RV1 for 75.95 to 76.05 kHz reading on the frequency
counter.
Adjustment Location: MAIN board (See page 10)
set
MAIN board
TP (FM IN)
TP (FM IN)
MAIN board
TP (GND)
TP (GND)
0.01
µ
F
Carrier frequency : 87.5 MHz
(98 MHz)
Modulation
: no modulation
Output level
: 0.1 V (100 dB)
FM RF SSG
( ): Except CD853: Canadian model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
(
): Italian model
AM VCO VOLTAGE ADJUSTMENT (CD853)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz (531 kHz)
3.0
± 0.05 V
Confirmation
1,710 kHz
9.7
± 1.5 V (9.0 ± 1.5 V)
(1602 kHz)
(
): Italian model
AM TRACKING ADJUSTMENT (CD853)
Adjust for a maximum reading on level meter
L3
580 kHz (621 kHz)
CT2
1,490 kHz (1404 kHz)
33 k
Ω
+
+
–
–
MAIN board
TP (FMST)
TP (RADIO +B)
TP (GND)
frequency counter
1
µ
F/50 V
10
ICF-CD853/CD853L
Adjustment Location:
– MAIN BOARD (Component Side) –
CT3
L3-2
L3-2
LW Tracking Adjustment (CD853L)
T1 AM (MW/LW) IF Adjustment
CT1
L1
L1
FM Tracking Adjustment
RV1 FM Stereo Adjustment
L4 AM (MW) VCO Voltage Adjustment
CT4 LW VCO Voltage Adjustment
CT2
L3-1
L3-1
AM (MW) Tracking Adjustment
CN303
TP
(VT)
TP (FM IN)
TP
(GND)
TP
(FM ST)
TP
(RADIO B+)
1
4
– MAIN BOARD (Conductor Side) –
ICF-CD853/CD853L
11
11
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope to TP (RF) and TP (GND) on the CD
board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
3. Press the
u
(CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
0.8
±
0.2 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
Adjustment Location:
IC701
TP (GND)
TP
(RF)
– CD BOARD (Conductor Side) –
Click on the first or last page to see other ICF-CD853 / ICF-CD853L service manuals if exist.