Sony CDX-C7850R Service Manual ▷ View online
4-4. BLOCK DIAGRAM — TUNER SECTION —
CDX-C7850R
– 35 –
– 36 –
1
2
AM ANT
FM ANT
8 FM +B
9 +B
18
40
33
32
41
42
39
2
1
7
16
L OUT
R OUT
12
13
20
22
19
5
60
AM DET
RECEIVE/SEEK
SD
STIND
S-METER
24
7
WIDE/NARROW
5
VT
10 AM +B
R-CH
Q17
Q16
MUTE
CONTROL
Q19
BUFFER
Q13
MUTE
CONTROL
Q205, 206
ACC
CHECK
Q608
BEEP
DRIVE
Q502
MUTE
CONTROL
Q211
POWER
CONTROL
Q601, 602
VOL
CONTROL
Q203
TUNMUTE
TIRPLAY
67
CKO
66
SO
64
VOLCE
68
SUB CE
80
NOSE SW
61
SW1
62
65
SW0
MUTE
118
LEDON
81
ACC IN
78
ILL IN
79
TELMUTE
58
TEST IN
15
BEEP
120
POW ON
3
WIDE
CONTROL
Q15
AF
SEEK
Q52
VT
CONTROL
IC12
NARROW
CONTROL
Q14
VT
CONTROL
Q51
WIDE
2
7
1
2
AFSEEK
25 SI
1 SEEK OUT
20 SDIN
4 ST/MONO
53 VSM
4
LO/DX
11
23
15
AM IF
21
FM IF
NARROW
6
DOUT
5
DIN
4
CLK
3
CE
18 PD
9 LO/DX
1 XI
20 XO
13 IF IN
6
VCO
15 AM OSC
16 FM OSC
X10
7.2MHz
TUNER PLL
IC10
26 SO
27 CKO
28 CE
PLL
TUNER UNIT
TU10
SUB
VOL/
SUB
AUXINL
CDINL
FMINL
AMINL
R
L
1
3
AMP
IC11
IC11
D13
CDINL
BUS AUDIO IN
-4
-3
CN202
R
L
FRONT
-1
-2
CN201
1
CD
SECTION
2
CD
SECTION
31
30
21 16 22
11
14
13
20
15
12
11
7
9
4
15
9 10
9 8 7
26
25
23
7
24
R-CH
TONE
CLK
DATA
CE
7
5
LINE AMP
IC203
B A
SWITCH
IC201
CLK
DATA
CE
ELECTRONIC VOLUME
IC204
ELECTRONIC VOLUME
IC202
SW802
(NOSE DET)
AMUT
12
7
LINE DRIVER
IC205
2
12
13
Q201
Q207
Q208
LINE DRIVER
IC207
REO1
FNTO1
Q214
Q215
STBY
22
MUTE
3
5
1
9
2
10
5
14
13
15
7
16
6
BATT
BATT
ILL
CHECK
Q604
ACC
D607
D602
6
FM ON
7
4
3
2
TU ON
56
POW SEL
BZ501
BEEP
SW502
(POWER SELECT)
OFF
ON
MODE2
MODE1
STB
9
8
COM8V
ANT+B
ANT+B
7
VCC
10 AM8V
11 FM8V
COM8V
AM8V
FM8V
POWER SUPPLY
IC602
ACC
F901
BATT
Q622
8.5V REG
Q12
ANT+B
5V REG
Q11
TU8.5V
TU5V
FM8V
AM8V
D12
(ANTENNA)
R-CH
CN202
R
L
REAR
-3
-4
R-CH
R
L
SUB OUT
-1
-2
R-CH
LINE
OUT/IN
POWER AMP
IC211
CN601
FL+
FL-
RL+
RL-
AMP REM
ILL
TEL MUTE
TEST
ACC
BATT
ANT REM
D202
D212
D201
04
SYSTEM CONTROL
IC501 (1/2)
FM DET
S-METER (RDS)
RV10
S-METER
6
5
3
SWITCH
IC104 (1/2)
SWITCH
IC104 (2/2)
Q102
Q103
BUFFER
Q10
MPX
95
98
101
96
99
100
97
82-85
1-4
BUSY
CE
CE
RD
WR
RES
DWN
56
55
54
53
35
11
CE
CE
XT1
XT2
RD
WR
RESET
PDWN
D0-3
47
48
X102
4.19MHz
2
POWER
SWITCH
Q101
MPTH
MTP
8
DAVN
9
SDA
10
52
75
70
71
SCL
DAVN
SIO
CKO
20 LVIN
4 OSCD
5 OSCI
14 VDDA
7 VDDD
X101
4.332MHz
BU5V
FM8V
RDS
DEMODULATOR
IC101
I2C
TIR
26
5
44
18
46
50
40
37
36
D0-3
BUSY
D-IN/OUT
SAS
39
15
16
2
11
17
18
22
23
SADX
RWCK
WE
CSI
TAS
SAS
SAD
RWCK
D-IN
DOUT
WE
CS
TAS
TIR CONTROL
IC103
TIR SIGNAL
REGISTER
IC102
4
ADPCM/
DAC
AOUT
L IN
16
• Signal path
: FM
: MW
: CD
: FM
: MW
: CD
(Page 32)
(Page 32)
– 37 –
4-5. CIRCUIT BOARDS LOCATION
– 38 –
• Waveforms
(MODE:PLAY)
1
2
3
4
5
6
7
Approx. 620mVp-p
IC1
!§
(FE)
0V
IC1
!¶
(RFO)
1.2Vp-p
Approx. 200mVp-p
IC1
!¢
(TE)
0V
IC501
&ª
(MDP)
2.6Vp-p
7.6
µ
sec
IC501
*¶
(LRCK)
5.8Vp-p
22.7
µ
sec
IC501
(¡
(BCK)
5.7Vp-p
474nsec
16.89MHz
IC501
`⁄‚‹
(XTAI)
3.2Vp-p
For schematic diagrams
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
%
: indicates tolerance.
•
¢
: internal component.
•
C
: panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
•
U
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
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.
• Signal path.
F
: FM
f
: MW
J
: CD
• Abbreviation
G
: German model.
For printed wiring boards
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
®
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A)
(Side A)
parts face are indicated.
DISC IN SW board
LOAD SW board
tuner unit
(TU10)
(TU10)
SUB board
LIMIT SW board
SERVO board
MAIN board
RELAY board
KEY board
– 39 –
– 40 –
CDX-C7850R
4-6. SCHEMATIC DIAGRAM — CD MECHANISM SECTION (1/3) — • Refer to page 68 for IC Block Diagrams.
Note:
• Voltage and waveforms are dc with respect to ground
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
no mark : CD PLAY
∗
: Impossible to measure
(Page 42)
(Page 43)
– 41 –
– 42 –
CDX-C7850R
4-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION (2/3) — • Refer to page 68 for IC Block Diagrams.
Note:
• Voltage and waveforms are dc with respect to ground
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
no mark : CD PLAY
∗
: Impossible to measure
(Page 43)
(Page 40)
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