Sony ICF-CD843L Service Manual ▷ View online
9
ICF-CD843L
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3-2
162 kHz
CT3
243 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE CONFIRMATION
Frequency Display
Reading on Digital Voltmeter
87.5 MHz
3.2
± 0.5 V
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)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
MW VCO VOLTAGE ADJUSTMENT
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
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
Adjust for a maximum reading on level meter
L3-1
621 kHz
CT2
1404 kHz
TUNER SECTION 0 dB=1 mV
[MW/LW]
Setting:
Function: RADIO
BAND button: MW or LW
Function: RADIO
BAND button: MW or LW
[FM]
Setting:
Function: RADIO
BAND button: FM
Function: RADIO
BAND button: FM
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustment.
SECTION 4
ELECTRICAL ADJUSTMENTS
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
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 (RADIO
+B) as shown the figure below.
2. Tune the set to 87.5 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
Modulation
Modulation
: no modulation
Output level
: 0.1 V (100 dB)
FM RF SSG
33 k
Ω
+
+
–
–
MAIN board
TP (FMST)
TP (RADIO +B)
TP (GND)
frequency counter
1
µ
F/50 V
10
ICF-CD843L
Adjustment Location:
– MAIN BOARD (Component Side) –
CT3
L3-2
L3-2
LW Tracking Adjustment
T1 AM IF Adjustment
CT1
L1
L1
FM Tracking Adjustment
RV1 FM Stereo Adjustment
L4 MW VCO Voltage Adjustment
CT4 LW VCO Voltage Adjustment
CT2
L3-1
L3-1
MW Tracking Adjustment
CN303
TP
(VT)
TP (FM IN)
TP
(GND)
TP
(FM ST)
TP
(RADIO B+)
1
4
– MAIN BOARD (Conductor Side) –
ICF-CD843L
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
Procedure:
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
thecenter of the waveform can be clearly distinguished.
RF Signal Reference Waveform (Eye Pattern)
Adjustment Location:
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.
IC701
TP (GND)
TP
(RF)
– CD BOARD (Conductor Side) –
ICF-CD843L
12
12
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – CD Section –
A
A
B
B
D
D
F
F
E
E
C
C
I-V AMP
DETECTOR
12
11
17
18
26
SL+
SL–
F–
F–
F+
F+
T+
T+
T–
T–
SPINDLE
MOTOR DRIVE
M701
(SPINDLE)
S701
(LIMIT)
SLED
MOTOR DRIVE
27
M702
(SLED)
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
SP+
SP–
3
25
9
19
FIN
TIN
SLIN
SPIN
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC702
LD
LD
PD
PD
LASER DIODE
OPTICAL PICK-UP
(KSS-213R)
2-AXIS
DEVICE
(FOCUS)
(TRACKING)
2
1
1
M
M
7
MUTE
AUTOMATIC
POWER
CONTROL
Q701
8
FIN2
7
FIN1
+
MIX
4
RF
LPF
EQ
PH
BH
10
TIN2
9
TIN1
A/D
SW
LPF
TRACK
JUMP
TBAL
80
LDD
APC
AUDIO
ADJUST
SERVO
PROCESSOR
RUPTURE
DETECT
79
LDS
SW
AGC
D/A
13
FE
15
TE
20
TDO
21
FDO
23
SLDO
22
SPDO
S/H
3
EFM
IN
IN
SLISE LEVEL
CONTROL
ERROR
CORRECTION
AUDIO CD
C1 – 2, C2 – 2
RAM
8FS
DIGITAL
FILTER
INTERPOLATION
MUTE
ATTENUATION
DEEMPHASIS
1 BIT
DAC
42
LCHO
45
RCHO
LPF
39
DOUT
AUDIO
OUT
FSEQ
PLL
VCEC
CLV, CAV
CONTROL
FRAME SYNC
DETECT,
PROTECT INSERT,
EFM DECODE
31
RAM
DRF
67
25
CONT4
72
CONT1
66
RES
61
CE
62
CL
63
DI
64
DO
65
WRQ
RF AMP, FOCUS/TRACKING SERVO,
DIGITAL SIGNAL PROCESSOR,
CLV SERVO, D/A CONVERTER
IC701
50 WRQ
56 DATA-IN CD
54 DATA CD/RADIO
55 CLK CD/RADIO
53 LAT CD/RADIO
58 XRST
57 DRF
41 FSEQ
CD-L
39
OPEN
S302
CD LID OPEN/CLOSE
DETECT
D306
D307
D308
A
SYSTEM
CONTROLLER
IC401 (1/2)
R-CH
: CD PLAY
•
R-ch is omitted due to same as L-ch.
•
SIGNAL PATH
DI, CLK, CE
B
GENERAL-PURPOSE
PORTS
COMMAND
INTERFACE
INTERFACE
DRF
XOUT
XIN
49
48
X701
33.8688MHz
DI
CLK
CE
D52
D53
D54
(Page 14)
(Page 13)
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