Sony CDX-C6850R Service Manual ▷ View online
IC3
CN1
IC1
CN2
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
+
–
–
TU601
RV1
MW AUTO SCAN/
STOP LEVEL ADJ
RV2
FM AUTO SCAN/
STOP LEVEL ADJ
RV3
FM STEREO
SEPARATION ADJ
(WIDE)
RV4
FM STEREO
SEPARATION ADJ
(NARROW)
RV801
FM RDS
S-METER ADJ
– 21 –
– 22 –
Adjustment Location : tuner unit (TU601)
–set upper view–
CD SECTION
Note:
1. CD Block basically constructed to operate without adjustment.
1. CD Block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
3. Use the oscilloscope with more than 10 M
Ω
impedance.
4. Clean an objective lens by an applicator with neutral detergent
when the signal level is low than specified value with the following
checks.
checks.
Focus Bias Adjustment
Setting: This adjustment is performed with the set placed
horizontally.
Focus Gain Adjustment (Coarse adjustment)
This adjustment is not required unless the following parts are replaced:
•
•
Optical pick-up
•
RV4
Procedure:
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
the 2-axis device (lens section of the optical pick-up) is
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
•
If the gain is too low:
Focus does not function and no music is selected.
Focus does not function and no music is selected.
•
If the gain is too high:
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Adjustment Location: servo board
Adjustment Location: servo board (component side)
Procedure:
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
on the SERVO board.
2. Connect the power supply.
3. Push the RESET button (S900) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
3. Push the RESET button (S900) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
RF signal level is correct or not.
Note: Clear RF signal waveform means that the sharp “
≈
” can be
clearly distinguished at the center of the waveform.
• When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
Adjustment Location: servo board
– 23 –
– 24 –
CDX-C6850R
4-1. BLOCK DIAGRAM — CD SECTION —
SECTION 4
DIAGRAMS
35
31
36
39
38
PD1
RF
CLKO
XLTO
DATO
SE IN
FOK
CN IN
RF 0
21
PCMD
22
BCK
20
LRCK
34
XTAI
27
GFS
19
CLK
20
XLT
21
DATA
24
SENS
25
FOK
23
14
DIN
59
57
56
54
1
55
C. OUT
37
FE BIAS
22
50
XRST
16
SLO
6
FEO
13
TAO
PD2
E
F
1 FEO
2 FEI
34 PD
33 LD
XRST
MDP
RF AMP, SERVO CONTROL
IC2
OPTICAL PICK-UP
KSS-521A
DIGITAL SIGNAL PROESSOR
IC1
D/A CONVERTER
IC702
FOCUS
GAIN
RV4
FOCUS
BIAS
RV1
LD POWER
CONTROL
Q1, 2
PD
LD
FOCUS/TRACKING COIL DRIVE,
MOTOR DRIVE
IC3
CH2 IN
LEVEL
SHIFT
22
16
15
TRACKING
CH1 IN
LEVEL
SHIFT
19
18
17
FOCUS
M902
(SLED)
CH2+
CH2–
CH1+
CH1–
CH3 IN
LEVEL
SHIFT
24
13
14
CH3+
CH3–
M
M901
(SPINDLE)
CH4 IN
LEVEL
SHIFT
2
CTL2 5
12
CH4+
M
M903
(LOADING)
FWD
LEVEL
SHIFT
6
REV
7
10
CH5+
M
49
SENS
46
SQSO
47
SQCK
51
DATA
52
XLAT
53
CLOK
43
SCOR
45
EXCK
41
WFCK
44
SBSO
5
BCKIN
6
LRCIN
4
CLKO
19
XTI
1
XTO
20
RSTB
15
12
V OUTL
9
V OUTR
17
MC/DM1
X700
16.9344MHz
3
1
2
4
3
11
12
13
6
SELECT
SWITCH
Q3-6
SCOR
EXCK
SBSO
WFCK
TXT ON
SCOR
CLOK25
XLAT25
DATA25
SQ CKO
SQ SI
CD SENS
GFS
XRST
TXT CKO
TXT SI
DQSY
C IN
FOK
LD ON
L SW
IN SW
D SW
SELF SW
XMODE
SCLK
SRDT
DQSY
CD TEXT
IC703
SW3
(LIMIT)
SW1
(DISC IN)
SW4
(DOWN)
SW2
(SELF)
23
2
1
114
115
116
117
118
120
27
25
77
57
75
28
3
4
19
17
78
6
5
DEEMPH
R-CH
30
SYSTEM CONTROL
IC801 (1/3)
CD L-CH
TUNER
SECTION
A
I-V
AMP
04
• Signal path
: CD
(Page 25)
4-2. BLOCK DIAGRAM — TUNER SECTION —
CDX-C6850R
– 25 –
– 26 –
ANT AM
L
R
L
CD L-CH
ANT FM
1
18
R 16
AM DET 12
FM+B 8
TU+B 9
AM+B 10
WI/NA 24
VT 5
LCL/DX 4
AM IF 11
FM IF 21
VCO 6
S-METER
(RDS)
15
FM DET 23
S-METER 19
ST/MONO 22
SD 20
SEEK 13
2
CNJ600
(ANTENNA)
TUNER UNIT
TU601
R-CH
FM8V
TU8V
AM8V
CD
SECTION
A
SE3L
SE3R
SCL
SDA
28
FML
1
CDL
OUT FL
12
22
OUT RL 20
SUB OUT+ 18
SUB OUT– 17
SUB OUT– 17
PDL
R-CH
11
27
MUTE
26
24
25
ELECTRONIC
VOLUME
IC401
PJ400
–1
–2
BUS AUDIO IN
2
3
1
SUB LPF
IC406
SYSTEM CONTROL
IC801 (2/3)
TU ATT
ATT 60
X1A 73
X0A 74
62
SEEK OUT
82
SD IN
83
ST/MONO
81
VOL ATT
58
S-METER
53
WIDE
84
NARROW
85
SCL
71
SDA
70
SSTOP
65
X801
32kHz
X0 92
X1 93
AMP ON 56
AMP ATT 31
TEL ATT 80
TEST 66
FM ON/
AM ON
68
TU ON 69
X800
3.68MHz
WIDE/NARROW
CONTROL
Q608,616,617
S-METER
Q801
AMP
Q618
RV801
S-METER
LP OUT
28
LCL/DX
5
IF AM
14
IF FM
15
FM IN
24
AM IN
25
OSC IN
9
OSC OUT
10
S METER
20
XO
4
XI
5
FM DET
16
5
1
SCL 12
SDA 13
SSTOP 16
SDA 9
SCL 10
MPTH 2
DAVN 8
PLL
IC601
MPDH
52
DAVN
67
QUALITY
50
NS MASK
55
X601
10.25MHz
X602
4.3MHz
RDS DECODER
IC602
NOISE
FILTER
IC603
NOISE
CONTROL
Q804
RDS POWER
CONTROL
Q604,605
TU5V
FM8V
RDS5V
MUTE
CONTROL
Q401,402
D402
MUTE
Q403
MUTE
Q111
MUTE
Q110
12
11
4 22
5
3
POWER AMP
IC200
1
9
9
7
2
10
13
15
5
6
7
16
CNP501
STBY
MUTE
Q916
AMP+B
ANT+B
ACC
BATT
F901
FL+
FL–
RL+
RL–
ATT
TEST
AMP REM
ANT REM
ACC
BATT
PJ400
L
R
SUB OUT
L
R
REAR
R-CH
–6
–5
L
R
FRONT
LINE OUT
R-CH
–4
–3
04
TUNER POWER
CONTROL
Q603,609
AM/FM POWER
CONTROL
Q610,612,615
+5V REG
Q613
+8V
FM 8V
AM 8V
TU 5V
TU 8V
MUTE
Q101
• Signal path
: CD
: FM
: MW
(Page 24)
– 27 –
– 28 –
CDX-C6850R
4-3. BLOCK DIAGRAM — DISPLAY SECTION —
RESET
IC902
1
2
BU5V
BATT
BATT
S901
(NOSE DET)
90
13
RESET
SO
14
CKO
104
CE
SO
CKO
CE
ANGLE
ILL ON
72 NOSE2
29 SYSRST
76 BU IN
SYSTEM CONTROL
IC801 (3/3)
LCD DRIVE
IC501
LCD
RC
LCD
BACK-UP
CHECK
Q906
SIRCS
BUFFER
Q806
ACC
CHECK
Q905
LCD ANGLE
CONTROL
Q802,803
COLOR
SELECT
Q504,506
LCD POWER
CONTROL
Q901,902
ROTARY
ENCODER
RE501
KEY ACTIVE
Q914,915
+10V REG
Q903
POWER
CONTROL
Q913,919
BATT
CHECK
Q940
+8V REG
Q904
+8V REG
Q912
CD POWER
CONTROL
Q907,908
ANT POWER
CONTROL
Q924,925
IR
RECEIVER
IC502
13
2
BUS INTERFACE
IC803
RST
RST
22 CK
21 SO
UNI
20 SI
11
4
CLK
CLK
36 BUS ON
24
41
SIRCS
95 COM8V ON
35 CD ON
32
47
48
MD ON
BATT
101
108
RE IN0 106
RE IN1
KEY IN1
KEY IN2
79
NIL
37
NIL
61
IN1
49
IN0
107
ACC IN
111 ANT REM
109 PW ON
12
1
BUS ON
BUS ON
9
6
DATA
8
DATA
DATA
10
3
BATT
BATT
D910
4
7
8
5
6
1
1
2
3
CNP801
(BUS CONTROL IN)
+5V REG
Q909
CD POWER
CONTROL
Q910,911
BATT
BATT
BATT
ACC
D909
BATT
D940
+8V
LED506,507
LSW511
LSW511
CD5V
AMP ON
1
2
4
VCC
AMP+B
5 BU+B
AMP+B
ANT+B
MD 8V
BU5V
POWER SUPPLY
IC901
18
17
19
VLC5
6
VLC4
7
VLC3
8
VLC2
9
VLC1
10
VLCD
DIM ON
11
3
POWER ON 4
AMBER 2
GREEN 1
COLOR
SELECT
Q503,505
DIMMER
CONTROL
Q501,502
LCD POWER
CONTROL
Q507
LCD501
LED501-505,
LSW512-521,
LSW531-538
LSW512-521,
LSW531-538
LED510,511
D919
D918
CNP802
(REMOTE IN)
(REMOTE IN)
KEY MATRIX
LSW512-521
LSW531-538
LSW512-521
LSW531-538
S502
04
S900
RESET
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