Sony CX-JT7 / JAX-PK7 / JAX-T7 Service Manual ▷ View online
CX-JT7
21
21
CD SECTION
Note:
1.
CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
check each item in order given.
2.
Use YEDS-18 (3-702-101-01) unless otherwise indicated.
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.
signal level is low than specified value with the following checks.
S-CURVE CHECK
Procedure :
1. Connect an oscilloscope to TP (FE) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In
1. Connect an oscilloscope to TP (FE) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 3
within 3
± 0.5 Vp-p.
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
brightness to obtain best waveform.
RF LEVEL CHECK
Procedure :
1. Connect an oscilloscope to TP (RF) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
1. Connect an oscilloscope to TP (RF) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
BD board
Oscilloscope
TP(FE)
TP(VC)
TP(VC)
symmetry
S-curve waveform
within 3
±
0.5Vp-p
A
B
TP(RF)
BD board
oscilloscope
TP(VC)
Note:
Clear RF signal waveform means that the shape “
◊ ” can be clearly
distinguished at the center of the waveform.
Connecting Location: BD board
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.3
±
0.3Vp-p
TP (VC)
TP (RF)
TP (FE)
IC721
– BD Board (Conductor side) –
SECTION 5
ELECTRICAL ADJUSTMENTS
CX-JT7
22
22
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – CD Section –
8
7
9
10
80
79
70 LIMIT SW
20
TDO
18
10
VO3(+)
FOIN
20
TIN
3
SPIN
7
LDS
25
SLIN
17 VO3(–)
11 VO2(+)
12 VO2(–)
26 VO4(+)
27 VO4(–)
2 VO1(+)
1 VO1(–)
A
C
B
D
E
F
LD
PD
RF AMP, FOCUS/TRACKING ERROR AMP,
DIGITAL SIGNAL PROCESSOR, DIGIRAL SERVO PROCESSOR,
DIGITAL FILTER, D/A CONVERTER
IC721
21
FDO
23
SLDO
22
SPDO
25
CONT4
A
B
D
E
F
C
I-V AMP
DETECTOR
LD
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213DCP)
2-AXIS
DEVICE
(FOCUS)
(TRACKING)
M702
(SPINDLE)
M701
(SLED)
M
M
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC722
49
48
X701
16.9344MHz
S701
(LIMIT)
79 DATAIN
80 DATACK
5 C2FIN
1 LRSY
2 ADDATA
3 ADBCK
4 ADLRCK
7 CKIN
9 CKOUT
78 RESB
99 I-LC78646/LC78684 DI
98 O-LC78646/LC78684 DO
100 O-LC78646/LC78684 CLK
5 O-LC78646 CE
85 I-WRQ
86 I-CD DRF
4 O-LC78646 RESET
60
DATA
59
DATACK
52
C2F
58
LRSY
57
ASDFIN
56
ASDACK
55
ASLRCK
54
16MOUT
10
6
76 66
53
EFLG
50
FSX/16MIN
73 CMDOUT
74 CMDIN
CE
FSYNC
O-LC78684 CE
I-LC78684 SYNC
75 CL
26
MP3RES
64
DO
63
DI
62
CL
96
I-CD NUMBER SENS
22
I-BU IP DOWN/
CD OPEN CLOSE
9
RIN
LM-R
11
RESET
1
O-SYS-MUTE
94
O-POWER RELAY
29
I-HOLD
S-MUTE
O-POWER
HOLD
61
CE
65
*WRQ
67
DRF
72
CD MUTE
66
*RES
4 OUT1
2 OUT2
M751
(LOADING)
M
LOADING MOTOR DRIVE
IC701
MP3 DECODER
IC801
SYSTEM CONTROLLER
IC901 (1/2)
S751
OPEN/CLOSE
DETECT
OPEN
CLOSE
LEVEL SHIFT
Q731
TABLE ADDRESS
SENSOR
IC731
+
ROTARY
ENCODER
S711
7
FIN
LM-F
9
RIN
TM-R
4 OUT1
2 OUT2
M741
(TABLE)
M
TABLE MOTOR DRIVE
IC712
7
FIN
TM-F
LM-F, LM-R,
TM-F, TM-R
D
S-MUTE,
O-POWER, HOLD
B
42
LCHO
45
RCHO
R-CH
CD-L
A
APC
FIN2
FIN1
LDD
LDS
TIN2
TIN1
XOUT
XIN
RF
4
EFMIN
3
ERROR
CORRECT
EQ,
AGC
COMMAND
INTERFACE
INTERFACE
CLOCK
GENERATOR
PH, BH
RF AMP
TBAL
A/D
CONVERTER
D/A
CONVERTER
EXTERNAL
AUDIO IN
SERIAL OUT
D/A
CONVERTER
SERVO
PROCESSOR
AUTOMATIC
POWER CONTROL
Q701
27
I-POWER DOWN
POWER DOWN
RESET
RESET,
POWER DOWN
C
• SIGNAL PATH
: CD PLAY
• R-ch is omitted due to same as L-ch.
(Page 24)
(Page 24)
(Page 24)
(Page 23)
R-CH
DISC TRAY
ADDRESS DETECT
I/01 – I/016
A0 – A8
MDATA0
– MDATA15
MADRS0
– MADRS8
27 OE
45
OEB
13 WE
42
WEB
14 RAS
41
RASB
29 LCAS
43
CASLB
28 UCAS
44
CASUB
IC802
MEMORY
2-5, 7-10,
31-34, 36-39
23-30, 33-40
60-53, 50
16-19, 22-26
MUTING
Q311
MUTING CONTROL
SWITCH
Q312
CX-JT7
23
23
6-2.
BLOCK DIAGRAM – TUNER/TAPE/PANEL Section –
10
CAPSTAN/REEL
MOTOR DRIVE
Q601
11
PLUNGER DRIVE
(DECK-A)
Q602
M
M
TAPE MECHANISM
DECK BLOCK
(CAPSTAN/REEL)
(DECK-A)
(DECK-B)
LED DRIVER,
TAPE MECHANISM CONTROLLER
IC202
MOTOR
3 DATA
4 CLOCK
87 I-LC72121 DI
92 O-LC72121/BU2099 CLK
9 O-LC72121 CE
88 I-TUNER TUNE
97 I-TUNER STEREO
2 I-BU1924 DI
3 I-BU1924 CLK
21 I-MIC/I-TU SIG
19 I-SPEANA M
91 O-LC72121/M61529/BU2099 DO
5 LCK
18 SO
A-SOL
G
TAPE-L, REC-L
(Page 24)
K
DI, SO, CLK, MCLK, LCK,
(Page 24)
J
TUNER-L
(Page 24)
D
LM-F, LM-R, TM-F, TM-R
(Page 22)
TUNER UNIT
AM LOOP
FM ANT
AM ANT
L-CH
R-CH
R-CH
TU-MUTE
DI
DI
CLK
CLK
S-OUT
LCK
DI
BIAS OSC
L201
REC BIAS
SWITCH
Q228
+9V
BIAS OSC
Q223
ERASE
HRPE1
(REC/PB/ERASE)
(DECK-B)
HP1
(PB)
(DECK-A)
L-CH
R-CH
R-CH
R-CH
L-CH
R-CH
R-CH
18 I-SPEANA L
20 I-SPEANA H
BAND-PASS
FILTER
Q204 – 206
SPEANA AMP
Q201, 202
B+ SWITCH
Q921
FL902
FLUORESCENT
INDICATOR TUBE
MUTING
Q219, 221
12
PLUNGER DRIVE
(DECK-B)
Q603
B-SOL
LED213
LED901
A-PHOTO
B-SOL
A-SOL
CAPM+
B-PHOTO
A-HALF
B-HALF
A-MODE
B-MODE
REC (FWD)
REC (REW)
9 I-BASS
+3.3V
B+
D603 – 610
I-B-PHOTO
I-B-HALF
I-REC (FWD)
S10/I-REC (REW)
S6 – S10
S1 – S5,
S11 – S23
G1 – G11
48
52
49
53
50
55
S7/I-A-PHOTO
95
O-KEYSCAN
S8/I-A-HALF
U8
U9
U7
S10/U11
S7/U5
S8/U6
S9/I-B-MODE
47
54
S6/I-A-MODE
S9/U10
S6/U4
U8
U9
U7
U11
U5
U6
U10
U4
93
O-POWER LED
8
O-BU2099 LCK
41 – 45, 56 – 68
30 – 40
MIC, SA
SA
MIC
E
SO
MCLK
LCK
X901
32.768kHz
13
12
XT2
XT1
7
O-M61529 CLK
16
15
X902
8.64MHz
CF2
CF1
i-BASS
LED303
8 CD3
3
LED302
7 CD2
2
LED301
6 CD1
1
POWER 1 STANDBY/ON
(Page 24)
(AEP, UK)
(Except AEP, UK, CIS)
SYSTEM CONTROLLER
IC901 (2/2)
FM 75
Ω
(COAXIAL)
LED DRIVER
IC201
3 DATA
4 CLOCK
5 LCK
18 SO
LED204
9 TAPE
TAPE A/B
LED205
10
HEAVY
HEAVY
LED206
11
VOCAL
VOCAL
LED207
12
SALSA
TECHNO
LED208
13
TECHNO
SALSA
LED210
14
HIP POP
HIP POP
LED211
15
MANUAL
MANUAL
LED203
8 AUX
MD (VIDEO)
LED202
7 TUNER
TUNER BAND
LED201
6 CD
CD
DISC DIRECT PLAY
ANTENNA
34
32
BIN (L)
AIN (L)
28
27
EQOUT (L)
26
PB-OUT (L)
TAI (L) MUTE
DECK A/B SELECT SWITCH, REC/PB EQ AMP
IC201 (SUFFIX-11) IC201 (SUFFIX-13)
REC-
OUT (L)
OUT (L)
REC-IN (L)
21
EQ
24
DO
CLK
CE
TUNED
ST
RDS DATA
RDS INT
MULTI CONTROLLER
IC309 (SUFFIX-11) IC309 (SUFFIX-13)
7 BIAS
15
14
6 REC
11 TUNER MUTE
MUTE-ON/OFF
REC MUTE-ON/OFF
9
10 REC MUTE
PB MUTE
8
A/B
13
A/B
REC ON/OFF
SWITCH
Q222, 225
3
DATA
4
CLOCK
5
LCK
18
SO
CLK
S-OUT
13
LM-L (CD)
LM-F
12
LM-R (CD)
LM-R
TAPE-L
REC-L
15
TM-L (CD)
TM-F
14
TM-R (CD)
TM-R
• SIGNAL PATH
: TUNER (FM/AM)
: TAPE PLAY (DECK-A)
: TAPE PLAY (DECK-B)
: REC
• R-ch is omitted due to same as L-ch.
H
SP-F
(Page 24)
16
FRONT SPON/OFF
76 I-HP MUTE
KEY ACTIVE
SWITCH
Q504, 505
28 I-RMC
REMOTE CONTROL
RECEIVER
IC802
S301 – 309,
S311 – 331
(FRONT PANEL KEY)
83 I-VOL B
84 I-VOL A
ROTARY
ENCODER
S801
VOLUME
79 I-BASS B
80 I-BASS A
ROTARY
ENCODER
S802
TREBLE
MIDDLE
81 I-JOG B
82 I-JOG A
ROTARY
ENCODER
S803
BASS
77 I-TRE B
I-KEY1 –
I-KEY3
78 I-TRE A
ROTARY
ENCODER
S804
MULTI JOG
26 – 24
HP
F
(Page 24)
+4V
+3.3V (SUB)
CX-JT7
24
24
6-3.
BLOCK DIAGRAM – AMP/POWER SUPPLY Section –
J221
R-CH
PHONES
SPEAKER
+
–
–
–
+
R
L
JK502
R-CH
–VL
–VP
+VP
–VH
OUTPUT LEVEL
DETECT
Q23, 24
Q23, 24
BIAS
Q507, 509
HOLD
Q7 – 9
FEED BACK
SWITCH
Q491
FINAL DRIVE
Q501, 503
SWITCHING
Q17, 19, 22
SWITCHING
Q18
R-CH
R-CH
+
+
R-CH
CASCADE
Q511, 513, 515
MIC AMP
IC401 (1/2)
MIC AMP
IC401 (2/2)
MUTING
Q525
CURRENT
MIRROR
Q521, 523
FREQUENCY
CONTROL
Q314 – 316
BASS BOOST
ON/OFF SWITCH
Q323
R-CH
+
+VL
+VH
OUTPUT LEVEL
DETECT
Q20, 21
Q20, 21
1
14
6
9
BASS BOOST ENHANCER
IC303 (SUFFIX-11) IC303 (SUFFIX-13)
INPUT SELECTSWITCH, TONE CONTROL,
ELECTRICAL VOLUME, BASS BOOST AMP
IC301 (SUFFIX-11) IC301 (SUFFIX-13)
BASS BOOST CONTROLLER
IC310 (SUFFIX-11) IC310 (SUFFIX-13)
CTRL1 –
CTRL3
INA
VREF
7
BBE
13
GIN
I-BASS
19
SAOUT
SA
MIC
OUTA
29
TOUT
25
OUT2
VR401
J401
3
DATA
4
CLOCK
LCK
S-MUTE
O-POWER
O-POWER
HOLD
CLK
SO
5
LCK
35
RECB-2
12 – 10
BASS BOOST
CONTROL
Q317 – 320
BB CTRL1 –
BB CTRL4
16 – 13
40 CD-L
MD-L
2 MIC
39 TUNER-L
38 TAPE-L
28 VOLIN2
MIC LEVEL
AGC
Q401
–30V REGULATOR
Q533 – 536 (Except AEP, UK, CIS)
Q534 – 536 (AEP, UK, CIS)
(AC IN)
SUB POWER
TRANSFORMER
PT902
MAIN POWER
TRANSFORMER
PT901
RECT
D2
+VL
TO
POWER AMP
BLOCK
–VL
VL
VL
VF1
TO
FLUORESCENT
INDICATOR TUBE
VF2
RECT
D1 (Except AEP, UK, CIS)
D3 – 6 (AEP, UK, CIS)
+VH
–VH
VM+9V
VM+10V
–VFL
EVER+10V
VH
VH
RECT
D319 – 322
RECT
D301 – 304
VM
VM
VCC
RECT
D902 – 905
DECK+9V, M+9V
+4V
REGULATOR
IC501
+3.3V (SUB)
POWER DOWN
RESET
D504
RESET SIGNAL
GENERATOR
IC502
MIC
MIC MIXING
CD-L
A
D402
TUNER-L
J
TAPE-L, REC-L
TAPE-L
REC-L
G
DI, SO, CLK,
MCLK, LCK
MCLK, LCK
K
RESET,
POWER DOWN
POWER DOWN
C
21
DATA
22
CLOCK
D401
MIC, SA
(Page 23)
E
S-MUTE, O-POWER, HOLD
B
: MIC INPUT
(Page 22)
H
(Page 23)
HP
F
(Page 23)
(Page 22)
(Page 23)
(Page 23)
(Page 23)
(Page 22)
(Except AEP, UK, CIS)
(Chilean, Peruvian)
(Chilean, Peruvian)
Except
Chilean, Peruvian
AC VOLTAGE
S901
Except
Chilean, Peruvian
VOLTAGE
SELECTOR
RY901
POWER ON/OFF
RELAY DRIVE
Q330, 331
RY902
+10V
REGULATOR
IC313
+9V
REGULATOR
IC308
D102
P+7V
D313 – 315
+9V
REGULATOR
IC305
+4V
REGULATOR
IC306
B+ SWITCH
Q301, 302
RELAY B+
+9V
+1.8V
(MP3)
+3.3V (MAIN)
+1.8V
REGULATOR
IC803
RESET SWITCH
Q901
R-CH
SPEAKER ON/OFF
RELAY DRIVE
Q304
FAN MOTOR
ON/OFF SWITCH
Q327, 328, 372, 373
RY501
M731
(FAN)
(FAN)
M
SP-F
: TAPE PLAY
: REC
: CD PLAY
: TUNER (FM/AM)
SIGNAL PATH
: MD (VIDEO) IN
R-ch is omitted due to same as L-ch.
R-CH
JK302
L
R
MD (VIDEO)
IN
37
BASS BOOST
CONTROL
Q492
R-CH
BUFFER
IC304
CENTER VOLATAGE
GENERATOR
Q324
VM+10V
MCLK
DI
+
R-CH
OVER LOAD
DETECT
Q505
DC DETECT
Q5, 6
THERMAL DETECT
Q10, 11
+
+
TH501,
502
+
R-CH
+
MUTING CONTROL
SWITCH
Q527
POWER OFF
MUTING DRIVER
Q529, 530
D513
VM+10V
HOLD
Q12
OVER CURRENT
DETECT
Q13
PRE DRIVE
Q517, 519
+4V
IC304 (SUFFIX-11) IC304 (SUFFIX-13)
IC313 (SUFFIX-11) IC313 (SUFFIX-13)
IC308 (SUFFIX-11) IC308 (SUFFIX-13)
IC305 (SUFFIX-11) IC305 (SUFFIX-13)
IC306 (SUFFIX-11) IC306 (SUFFIX-13)
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