Sony HCD-LX7 / HCD-LX8 / LBT-LX7 / LBT-LX8 Service Manual ▷ View online
HCD-LX7/LX8
17
17
6-1. CIRCUIT BOARDS LOCATION
CD SECTION
Note:
1. CD Block is 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 an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
checks.
S Curve Check
Procedure :
1. Connect the oscilloscope to test points TP (FE) and TP (VC).
2. Connect TP (FE1) and GND, and TP (AGCCON) and GND of
1. Connect the oscilloscope to test points TP (FE) and TP (VC).
2. Connect TP (FE1) and GND, and TP (AGCCON) and GND of
the BD board with lead wires.
3. Press the "/1 button to turn the set ON.
4. With the disc (YEDS-18) loaded, press the HX button and
4. With the disc (YEDS-18) loaded, press the HX button and
perform focus search. (Focus search will be performed in the
same way even while the disc table is pushed in and out.)
same way even while the disc table is pushed in and out.)
5. Check the symmetry and peak to peak level of the oscilloscope
waveform (S curve) at this time.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD
1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD
board.
2. Press the "/1 button to turn the set ON.
3. Put disc (YEDS-18) in and playback 5 track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
3. Put disc (YEDS-18) in and playback 5 track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
Adjustment Location :
[ BD BOARD ] — SIDE A —
Procedure:
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Press the "/1 button to turn the unit ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the HX button.
5. Check the level B of the oscilloscope's waveform and the A (DC
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Press the "/1 button to turn the unit ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the HX button.
5. Check the level B of the oscilloscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following:
Confirm the following:
• A/B x 100 = less then ± 22 (%)
• B = 1.3 ± 0.6 Vp-p
• B = 1.3 ± 0.6 Vp-p
1 track jump waveform
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (FE)
TP (VC)
TP (VC)
+
–
–
symmetry
A
B
Within 3
±
1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
+
–
–
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.45
±
0.25 Vp-p
0V
Center of the waveform
B
Symmetry
A (DC voitage)
level : 1.3
±
0.6 Vp-p
oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
+
–
–
TP
(VC)
(VC)
TP
(RF)
(RF)
TP
(TE)
(TE)
TP
(FE1)
(FE1)
TP (FE)
TP
(AGCCON)
(AGCCON)
SECTION 6
DIAGRAMS
BD board
MIC board
TC-A board
TC-B board
PANEL-FL board
PANEL-VR board
HEADPHONE board
LED board
CD MOTOR board
TABLE SENSOR board
TUNER UNIT
TRANS board
MAIN board
FRONT INPUT board
CD-R board
CD-L board
PA board
AUDIO board
LEAF SW board
SUB TRANS board (LX7)
HCD-LX7/LX8
18
18
6-2. BLOCK DIAGRAMS
– BD (CD) SECTION –
E
F
A
B
C
D
A
C
RF
FF
TE
D
B
E
F
LD
PD
VCC
VC
RF
SUMMING
AMP
FOCUS
ERROR
AMP
TRACKING
ERROR
AMP
LD
DRIVE
Q101
VC
BUFFER
INTEG-
RATOR
RATOR
RF EQ
AMP
INTEG-
RATOR
RATOR
DIGITAL
PLL
IC101
DIGITAL SERVO
DIGITAL SIGNAL PROCESSOR
SUBCODE
PROCESSOR
SERIAL IN
INTERFACE
SERVO
AUTO
SEQUENCER
SERVO
INTERFACE
OVER SAMPLING
DIGITAL FILTER
D/A
INTERFACE
DIGITAL
OUT
TIMING
LOGIC
ERROR
CORRECTOR
EFM
DEMODULATION
APCLD/PD
AMP
5
7
8
6
16
14
49
51
13
LDON
VC
22
15
21
12
11
10
3
IC103
RF AMP
VC
4
VREF
HOLD SW
REF
IC102
FOCUS/TRACKING COIL DRIVE
SPINDLE/SLED MOTOR DRIVE
11
12
T+
T–
14
13
F+
F–
TRACKING
COIL
FOCUS
COIL
CH2OUTR
CH2OUTF
5
CH2FIN
6
CH2RIN
2
CH1FIN
3
CH1RIN
23
CH3RIN
24
CH3FIN
25
CH4SIN
27
CH4BIN
20
MUTE
CH1OUTF
CH1OUTR
17
18
SD+
SD–
CH3OUTF
CH3OUTR
M
15
16
SP+
SP–
CH4OUTF
CH4OUTR
M
M102
SLED
MOTOR
M101
SPINDLE
MOTOR
TFDR
TRDR
FFDR
FRDR
SRDR
SFDR
VC
FD
PD
LASER
DIODE
A
C
D
B
E
F
DETECTOR
OPTICAL PICK-UP BLOCK
(KSS-213B/K-N)
LD
POWER
RF AC
ASY1
48
38
42
43
39
41
40
28
26
29
ASY0
ASYMMETRY
CORRECTION
CORRECTION
SFDR
MDP
SRDR
33
32
FRDR
FFDR
31
30
42
TRDR
TFDR
SE
CE
TE
FE
RFDC
CE
VC
SLED
PWM
PWM
GENERATOR
FOCUS
PWM
GENERATOR
TRACKING
PWM
GENERATOR
PWM
GENERATOR
SLED
SERVO
FOCUS
SERVO
SERVO
TRACKING
SERVO
SERVO DSP
DIGITAL
CLV
OPERATIONAL
AMPLIFIER
ANALOG
SWITCH
A/D
CONVERTER
16K
RAM
DATA BUS
3rd ORDER
NOISE SHAPER
PWM
PWM
CPU
INTERFACE
2
1
3
SQSO
60
D OUT
67
STAO
66
XTA1
8
SENS
20
SCOR
14
XLON
XRST
SQCK
5
DATA
6
XLAT
7
CLOK
9
SCLK
27
SSTP
79
RMUT
80
LMUT
70
LMUT
71
AIN1
72
LOUT1
77
LOUT2
76
AIN2
75
LOUT2
TBL-R
UP SW
TRAY SENS
L OUT
R-CH
TBL-L
HOLD
+5V
SQCK
SCOR
CLOK
XLT
DATA
SENS
SQSO
XRST
DOUT
X101
16.9344MHz
16.9344MHz
A
MAIN
SECTION
09
S101
LIMIT SW
• SIGNAL PATH
: CD
: Digital out
: CD
: Digital out
DISC
SENSOR
IC202
IC201
MOTOR DRIVER
3
7
OUT 2
OUT 1
1
IN 2
9
IN 1
M
+5V
M201
TABLE
MOTOR
LED
D201
(DISC No.)
LED SW
Q201
S201
(UP SWITCH)
(Page 20, 21)
HCD-LX7/LX8
19
19
– DECK SECTION –
IC611
R CH
HP101
PB HEAD
(DECK A)
(DECK A)
L
R
RV311
PLAYBACK
LEVEL
DECK A
IC601
R CH
L
R
RV301
PLAYBACK
LEVEL
DECK B
3
1
IC602
4
REC/PB
EQOUT
REC BIAS
BIAS OSC
T621, Q621, 622
ERASE HEAD
ERASE BIAS
46
48
B IN
A IN
16
PB-A/B
EQIN
38
36
RV301
REC LEVEL
39
RECOUT
BIAS SW
D
M
70
120
DOLBY
TYPE B
TYPE B
+7.5V
Q623
LIN
43
PB
24
18
20
22
40
25
PB OUT
LM ON/
OFF
BIAS ON/OFF
RM ON/OFF
ALC ON/OFF
TC PB L
TC REC L
PB A/B
NORM/HIGH
REC/PB/PASS
BIAS ON/OFF
RM ON/OFF
15
ALC ON/OFF
RELAY
09
B
MAIN
SECTION
LM ON/OFF
NORM/
HIGH
PAS
DOL
P
R
REC/PB HEAD
(DECK B)
X
DOLBY NR
IC301
IC301
DOLBY NR
HRPE101
RV341
REC
BIAS
32
23
NR ON/
OFF
NR ON/OFF
17
S1004
A CrO
2
S1008
B CrO
2
19
A 120/70 B NORM/CROM/
METAL
M
CAP MOTOR
CONTROL
Q336-343
CONTROL
Q336-343
SPEED
CONTROL
Q1001
SWITCH
Q335
RV1001
HIGH
SPEED
RV1002
NORMAL
SPEED
M1
CAPSTAN
MOTOR
CAPM CNT2
CAP M H / L
CAPM CNT1
REEL
DETECT
IC1001
A SHUT
B SHUT
REEL
DETECT
IC1002
S1001 (A PLAY)
+5V
S1002 (B PLAY)
A PLAY
B PLAY
A HALF
B HALF/REC A/REC B
S1003
(A HALF)
+5V
+5V
S1005
(REC A)
S1006
(B HALF)
S1009
(REC B)
• R CH : Same as L ch
• SIGNAL PATH
: PB (DECK A)
: PB (DECK B)
: REC (DECK B)
• SIGNAL PATH
: PB (DECK A)
: PB (DECK B)
: REC (DECK B)
R CH
CN301
1
3
28 27
26
MS
MS OUT
B TRIG
A TRIG
TRIGGER
MOTOR
CONTROL
Q331-334
MOTOR
CONTROL
Q331-334
A DECK/
B DECK
PLUNGER
B DECK
PLUNGER
• PLUNGER SOLENOID is supplied
as the MECHANICAL BLOCK ASSY.
as the MECHANICAL BLOCK ASSY.
31, 33
(Page 20, 21)
HCD-LX7/LX8
20
20
– MAIN (1/2) SECTION –
RESET
IC801
SPEANA
MD OUT
J701
L-CH SIG
BBA2
BUS OUT2
REC B2
REC A2
BBB2
VD OUT
6
1
VIDEO 2
IN
IN1
IN3
J804
10
2
3
5
C
B
A
VIDEO
IN
J702
46
45
28
J705
J805
X
12
14
V1, AU
(L IN)
X1
X0
J701
13
10
9
B
A
V2, AU,
L-CH IN
J804
09
46
45
IC181 SELECTOR
IC191
AV SWITCH
PHONO
(L IN)
J701
CD
SECTION
TC PB L
MD (L IN)
69
68
66
IN D2
IN B2
IN A2
IC101
SOUND PROCESSOR 1
IC601
PHONO AMP
65
2
67
IN C2
MIC IN
IN E2
64 IN F2
MUTE
SWITCH
Q804
MUTE
SWITCH
Q803
RESET
SWITCH
Q802
D807
MAIN CONTROL
IC501 (1/2)
6
3
LINE-MUTE
F-RELAY
7
28
34
38
47
45
DBFB-H/L
V-MUTE
SW-MODE
493-LAT
493-DATA
FUNC-SEL1
22
AC-CUT
46
FUNC-SEL0
48
493-MUTE
RESET
7
28
34
38
47
45
46
46
48
48
47
38
34
37
BUF IN2
SWITCH
Q115
7
SWITCH
Q111
SWITCH
Q112
57
36
39
38
58
L+R
30
MUTE
SWITCH
Q113
VIDEO
OUT
J702
TC REC L
DECK
SECTION
POWER
SECTION
MIC-SIG
ST-L
CD-L
D OUT
J701
B
(Page 19)
A
(Page 18)
C
(Page 22,
23)
DECK
SECTION
B
(Page 19)
POWER
SECTION
E
(Page 22, 23)
DISPLAY
SECTION
D
(Page 24)
TC REC L
3
1
DISPLAY
SECTION
F
(Page 24)
DBFB
F-RELAY
POWER
SECTION
G
(Page 22, 23)
• R CH: Same as L ch
• SIGNAL PATH
: FM
: CD
: PB
: REC
: VIDEO/MD
: Digital out
• SIGNAL PATH
: FM
: CD
: PB
: REC
: VIDEO/MD
: Digital out
FM/AM TUNER
TUNER UNIT IS
SUPPLED AS THE
ASSEMBLED
BLOCK
TUNER UNIT IS
SUPPLED AS THE
ASSEMBLED
BLOCK
CD
DIGITAL
OUT
D OUT
CD
(L OUT)
CD
(LIN)
IC781
OPTICAL
TRANSMITTING
EXCEPT
LX7/LX8:MX
JW704
LX7/LX8:MX ONLY
33
32
34
CLOCK
DATA
LATCH
12
RESET
RESET
SWITCH
Q801
D805
+5v
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