Sony ICF-CD837 Service Manual ▷ View online
ICF-CD837
17
17
ICF-CD837
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM — CD SECTION —
• Signal path
: CD
A
C
B
F
E
D
A
C
B
D
LD
PD
VR
F
T+
T–
F+
F–
F–
SL+
SL–
SL–
SP+
SP–
E
VREF
LD
PD
LD POWER
CONTROLLER
Q701
APC
FIN2
FIN1
LDD
LDS
TIN2
TIN1
VREF
RF
10
9
11
80
7
79
4
8
9
12
11
TRACKING
COIL
DRIVE
19
7
FOCUS
COIL
DRIVE
TIN
FIN
25
SLIN
SLED
MOTOR
DRIVE
3
SPINDLE
MOTOR
DRIVE
SPIN
VREF
OPIN
MUTE
T+
T–
17
18
F+
F–
26
27
SL+
SL–
2
1
SP+
SP–
TRACKING
COIL
FOCUS
COIL
OPTICAL PICK-UP
BLOCK
(KSS-213C)
M
M
M702
SLED
MOTOR
M701
SPINDLE
MOTOR
SLED/SPINDLE
MOTOR DRIVER,
TRACKING/FOCUS
COIL DRIVER
IC702
S701
(LIMIT)
EFMIN
HFL
AGC
PH(RFENV)
FE
TE
VREF
CONT1
FSEQ
CONT4
DRF
RES
DI
CE
CL
WRQ
DO
XOUT
XIN
LCHO
RCHO
A
3
67
TDD
TD
FD
SP
SL
31
72 25
66
63 61 62
49
48
65 64
42
45
RF AMP,
SYSTEM SERVO PROCESSOR,
DIGITAL SIGNAL PROCESSOR
IC701
40
57 39
54 56 55 50 53
58
X701
16.93MHz
LAT
DATA
CLK
WRQ
XRST
DRF
FSEQ
DATA-IN CD
CD OPEN
SYSTEM CONTROLLER
IC401 (1/2)
S401
PUSH
OPEN/
CLOSE
CLV,CAV
CONTROL
PLL
VCEC
SWITCH
ERROR
CORRECTION
AUDIO CD
A/D
CONVERTER,
SERVO
PROCESSOR
FRAME SYNC
DETECT,PROTECT
INSERT
EFM DECODER
INTERPOLATION
MUTE
&
ATTENUATION
DEEMPHASIS
8FS
DIGITAL
FILTER
&
1-bit DAC
LPF
SLICE
LEVEL
CONTROL
GENERAL
PURPOSE
PORT
COMMAND
INTERFACE
INTERFACE
CLOCK
GENERATOR
23
15
FD
SL
SP
TD
VREF
VREF
VREF
CD-R
NC
CD- L
MAIN
SECTION
D/A
CONVERTER
PH/BH
20
FDD
SPDO
SLDO
21 22 23
AUDIO
OUT
DOUT
39
(Page 18)
ICF-CD837
18
18
ICF-CD837
5-2. BLOCK DIAGRAM — MAIN SECTION —
T1
AM IF
RV601
BRIGHTNESS
CT1,L1
AM
TRACKING
CT4,L4
AM
FREQUENCY
COVERAGE
CT2,L2
FM
TRACKING
CT3,L5
FM
FREQUENCY
COVERAGE
CF1
QUAD
AFC
VREG
24
23
21
12
8
7
4
14
FM
DET
AM
OSC
AM
MIX
FM
OSC
FM
MIX
AM
DET
LPF2
VREG
CF2
CF3
L2
CT2
CV1-2
L5
CT3
CV1-3
VREG
MIX
OUT
MPX
IN
T1 AM IFT
L1
AM
FERRITE-ROD
ANTENNA
IC1
FM/AM FRONTEND
IF AMP,DET
LOUT
ROUT
DET
OUT
VREG
VREG
AM
IF
IN
IF
IN
FM
IF
IN
IF
IN
FM
RF
IN
RF
IN
AMRF IN
FM RF OUT
FM OSC
AF
ST/MO
FM/AM
R-CH
R-CH
13
DECODE
18
17
16
19
ANT1
(FM)
1
S1
BAND
BPF1
AM FM
CT4
CV1-4
CT1 CV1-1
L4
20
AM OSC
CD-R
CD SECTION
CD-L
A
59
52
38-30
68-64
68-64
SEG0
I
SEG12
SEG1
I
SEG13
60
63
51
14
15
16
49
77
78
7
1
11
40
79
80
42
44
75
43
45
46
X402
4.19MHz
SP101
SPEAKER
(L-CH)
SP201
SPEAKER
(R-CH)
R-CH
LIN
LOUT
TIME CLOCK
DETECT
+3.9V
REG
+3.9V
+3.9V
Q1
Q904
Q551
Q681
Q682
Q901
T901
JW901
F901
D901
US,MX
CND,AUS
D902
D903-906
Q902,903
+6V
+3.3V
CD+B
+11V
+6V
REG
LED
DRIVE
LED
DRIVE
VOLTAGE
CHECK
Q905
RIPPLE
FILTER
+B
SWITCH
+B
SWITCH
Q401
D401
IC402
S401
MUTE
DRIVE
Q301
Q515
+3.3V
MIX AMP
Q101,102
Q102
Q104
IC401 (2/2)
SYSTEM CONTROL
A MUT
BUZZER
POWER ON
SEG13
50/60Hz
AC IN
RADIO ON
CD ON
VREF
COM1
17 SEG15
14 SEG14
COM2
CD OPEN
KEY1
X2
74 X1
71
X401
32KHz
XT2
70 XT1
SW2
SW0
SW1
CD/RADIO
NAP LED
KEY0
62
Q514
SEG14
76
RESET
1
I
13
S602
RADIO ON
S604
TIME SET -/.
S606
SNOOZE/
SLEEP OFF
S607
ALARM
SET A
S653
CLOCK
SET/
TRACK
S610
ALARM
SET B
S603
CD/u
S601
ALARM RESET
/x/OFF
VR301
VOLUME
S605
SLEEP
S608
NAP
S609
TIME SET +/>
D681
CD/RADIO
D682
NAP
S612
ALARM MODE A
S651
CD PLAY MODE
BUZZER RADIO CD OFF
S611
ALARM MODE B
NORMAL
REPEAT
SHUFFLE
SHUFFLE REPEAT
STBY
IC301
POWER AMP
3
1
AC IN
LED501
LED INDICATOR
UNIT
Z
PUSH
OPEN/CLOSE
BUZZER RADIO CD OFF
BRIGHTNESS
CONTROL
Q402
LED
DRIVER
Q501-513
RESET
• Signal path
: CD
: FM
: AM
• R-ch is omitted due to
same as L-ch
• Abbreviation
CND : Canadian model
MX : Mexican model
AUS : Australian model
MX : Mexican model
AUS : Australian model
(Page 17)
ICF-CD837
19
19
ICF-CD837
5-3. CIRCUIT BOARDS LOCATION
• NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
• C : panel designation.
• A : B+ Line.
• H : adjustment for repair.
• Voltage and waveforms are dc with respect to ground
• H : adjustment for repair.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
– CD Board –
no mark : CD PLAY
– MAIN Board –
no mark : FM
(
– CD Board –
no mark : CD PLAY
– MAIN Board –
no mark : FM
(
) : AM
<
> : CD
– Other Boards –
no mark : FM
no mark : FM
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
J
: CD PLAY
• Abbreviation
CND : Canadian model.
MX
MX
: Mexican model.
AUS
: Australian model.
for printed wiring boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
Q
Q
E
B
C
E
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
Replace only with part number specified.
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Waveforms
— CD BOARD — (Mode: PLAY)
CD board
KEY board
BRIGHTNESS board
POWER board
INDICATOR board
DRIVE board
MAIN board
0.85
±
0.2Vp-p
Approx. 100mVp-p
1
IC701 4 (RF)
500mV/div, 0.5
µ
sec/div
1.6V
Approx. 100mVp-p
1.6V
16.93MHz
3.0Vp-p
2
IC701 qd (FE)
100mV/div, 5msec/div
3
IC701 qg (TE)
100mV/div, 5msec/div
4
IC701 rk (XOUT)
1V/div, 0.05
µ
sec/div
3.3Vp-p
3.3Vp-p
4.19MHz
32.768kHz
1
IC401 ua (XT2)
1V/div, 10
µ
sec/div
2
IC401 ug (X2)
1V/div, 0.1
µ
sec/div
— MAIN BOARD —
ICF-CD837
20
20
ICF-CD837
5-4. PRINTED WIRING BOARD — CD SECTION — • Refer to page 19 for Circuit Boards Location.
: Uses unleaded solder.
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
IC701
Q701
IC702
C729
C730
R730
R728
R729
C704
R708
C728
R724
R722
R725
R726
R707
C701
C726
C723
C725
C724
R719
R717
R718
R716
C720
C721
R731
R721
R720
R715
R714
C727
C711
C709
FB701
C736
C734
R709
C705
R710
R701
C703
C731
R706
R727
R712
R723
C708
R741
JC701
R744
C751
JC702
JC703
C743
C744
C742
C754
C755
C741
C707
L706
C739
C738
R732
R742
R735
R704
R733
R702
R734
R703
R746
R743
R705
R736
R747
R738
R711
R713
R737
C716
C722
C717
C745
M702
M701
S701
C732
CNP701
X701
CNP702
JW706
JW707
JW709
JW713
JW714
JW715
JW716
JW717
JW718
JW721
JW722
JW723
JW724
JW725
JW726
JW727
JW728
JW729
C740
C750
C746
C747
JW719
C735
JW720
C733
C706
JW712
JW710
JW702
JW701
JW708
C702
JW703
JW705
JW704
JW711
JW730
JW731
JW732
(Page 22)
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