Sony CDX-M750 - Fm/am Compact Disc Player User manual

http://servis-manual.com/

22
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. FRONT PANEL ASSY (NORMAL)
2-2. FRONT PANEL ASSY (INOPERATIVE)
1Turn on the power and open the front panel.
2screw (panel)
stand
3screw (panel)
4front panel assy
(Take care not to
pull the flexible
board excessively.)
flexible board
7Lift the cam (R) assy
slightly to make a play.
4PTT 2.6x6
3PTT 2.6x6
1screw (panel)
flexible board
9
0front panel assy
(Take care not to pull the
flexible board excessively.)
2screw (panel)
8Lift the motor block assy
slightly to make a play.
5PTT 2.6x6
6PTT 2.6x6

23
2-3. CD MECHANISM BLOCK, FLEXIBLE BOARD
2-4. SUB PANEL (CD) SUB ASSY
2PTT 2.6x4
4CNP701
1PTT 2.6x6
3PTT 2.6x4
5CD mechanism block
7bracket (CD)
6PTT 2.6x6
8cover (flexible)
0flexible board
9CNP802
Note:When installing
the flexible board,
make the board slack
as illustrated.
3PTT 2.6x6
6sub panel (CD) sub assy 2PTT 2.6 x6
5claw
1CNP805
4claw

24
1PTT 2.6x6
4PTT 2.6x6
5motor block assy
2cam (R) assy
3CNP902
A
Note: Install the cam (R) assy with
the cam fully rotated in the
direction of the arrow A.
2-6. MAIN BOARD
2-5. MOTOR BLOCK ASSY, CAM (R) ASSY
Note : Install the motor block assy and cam (R) assy in this roder.
For phase alignment between cams (L) and (R), see page 29 and 31.
4PTT 2.6x6
ground point
5PTT 2.6x6
ground point
1PTT 2.6x8
6MAIN board
3PTT 2.6x
8
2PTT 2.6x8

25
2-7. HEAT SINK
2-8. CHASSIS (T) SUB ASSY
5heat sink
1PTT 2.6x8
3PTT 2.6x8
4PTT 2.6x
8
2PTT 2.6x12
4chassis (T) sub assy
3P 2x3
2P 2x3
1Unsolder the
lead wires.
black
red
white

26
2-10. SERVO BOARD
2-9. LEVER SECTION
4claws
2DISC IN SW board
7lever (L)
3tension spring (LR)
6lever (R)
5guide (disc)
1special screw
6PS 2x4
1CN3
3Removal the solders.
4P 2x3
5loading motor assy
8SERVO board
2CN2
7PS 2x4

27
Fig. 1
1tension spring (RA)
2arm (roller)
3retaing ring (RA)
4shaft retainer
5shaft roller assy
retaing ring (RA) arm arm
washer washer shaft retainer
shaft retainer
2-11. SHAFT ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
2-12. FLOATING BLOCK ASSY
1tension spring (KF1)
7compression spring (FL)
6floating block assy
8compression spring (FL)
4Fit lever (D) in the
direction of the arrow.
2damper (T)
3damper (T)
5Turn loading ring in the
direction of the arrow.

28
2-13. OPTICAL PICK-UP BLOCK
1P 2x3
2sled motor assy
3optical pick-up block

29
cam (L
)
arm (A-L) assy
arm (B-L) assy
C
A
B
3stop ring 1.5, type-E
hole
SECTION 3
PHASE ALIGNMENT
3-1. ARM (A-L) ASSY, ARM (B-L) ASSY
3-2. CAM (L)
1Move the arm (B-L) assy in the direction of the
arrow Aand the arm (A-L) assy in the direction of
the arrow Bfully (full open state).
2Align the hole on the cam (L) with part Cand install
the cam.
4Turn the cam (L) clockwise and counterclockwise to
verify that both the arms are operated.
5stop ring 1.5, type-E
2stop ring 1.5, type-E
3spring (arm L)
1arm (B-L) ass
y
4arm (A-L) assy
bracket (L) assy

30
3-3. MOTOR BLOCK
3-4. ALIGNMENT BETWEEN ARM (A-L) ASSY
AND ARM (B-L) ASSY
1Turn the cam (L) and position the cam so that part A
does not touch the SWITCH board SW900.
1Input 9V DC to the motor terminal until the cam (L)
stops rotating.
Take care to avoid overload of the motor.
2Verify that the arm (A-L) assy and arm (B-L) assy
are positioned as shown below (full open).
3PTT 2.6x6
4PTT 2.6x6
2motor block
SWITCH board
SW900
cam (L
)
5B 2.6x4
A
motor
GND
arm (B-L) assy
arm (A-L) assy
DC 9
V
+B

31
3-6. CAM (R)
3-5. ARM (A-R) ASSY, ARM (B-R) ASSY
1Move the arm (B-R) assy in the direction of the
arrow Aand the arm (A-R) assy in the direction of
the arrow Bfully (full open state).
2Align the hole on the cam (R) with part Cand install
the cam.
4Turn the cam (R) clockwise and counterclockwise to
verify that both the arms are operated.
bracket (R) assy
4arm (A-R) ass
y
3spring (arm R)
2stop ring 1.5, type-E
5stop ring 1.5, type-E
1arm (B-R) assy
3stop ring 1.5, type-E
cam (R)
B
A
C
arm (B-R) assy
hole
arm (A-R) assy

4242
04
I-V
CONV.
FOCUS
ERROR DIGITAL
CLV
SUB
CODE
PROCESS
TRACKING
ERROR
LD
DRIVE
Q101
FOCUS
COIL
DRIVE
RF
EQ
EFM
DEM
D/A
I/F
RFO RFAC
FE
TE
SE
RFDC
FFDR
FRDR
TFDR
SFDR
SRDR
MDP
TRDR
TE
FE
E
D
B
C
A
F
11
10
PD
4
LD
3
7
6
8
13
14
16
LD
AMP
LD ON
HOLD SW
AGC CONT
22
21
20
5
RF AMP, LD APC,
ERROR AMP
IC1
DIGITAL SERVO,
DIGITAL SIGNAL PROCESSOR
IC501
TRACKING/FOCUS COIL DRIVE
SLED/SPINDLE/LOADING MOTOR DRIVE
IC7
10
11
22
21
TRACKING
COIL
DRIVE
8
9
25
24
SLED
MOTOR
DRIVE
6
7
31
32
FOCUS
COIL
TRACKING
COIL
M902
SLED
MOTOR
SPINDLE
MOTOR
DRIVE
12
13 18
M901
SPINDLE
MOTOR
LOADING
MOTOR
DRIVE
5
4
1
2
34
35
M903
LOADING
MOTOR
MUTE 1
MUTE 2
42
43
40
41
38
39
35
52
51
50
61 79
86
81
SQSO 6
SQCK 7
SCOR
MD2
24
73
XRST 11
DATA 13
XLAT 14
SCLK 17
CLOK
XTAI
BCK
77
LRCK
PCMD
15
SENS 16
GFS 22
FOK 32
LOCK 34
54
SERVO
CTL
X1
10MHz
SW4
(LIMIT)
SW1
(DOWN)
SW3
(DISC IN)
SW2
(SELF)
LM EJ
69
LM LOD
66
SLED –
40
DRIVE ON
70
LD ON
20
HOLD
22
AGC CONT
23
SSTP
11
FOK
XIN
XOUT
54
GFS
55
SENS
57
CD CKO
65
SCLK
45
CD XLAT
68
CD DATA
67
CD RST
21
MD2
71
SCOR
64
SCK2
48
SI2
49
LOCK
16M
BCK
LRCK
DATA
CD ON
MD ON
46
CD ON
18
CDM ON
17
D SW
10
IN SW
62
SELF SW
63
CD SYSTEM CONTROL
IC5
SYSTEM CONTROL
IC801 (1/3)
BUS CLK 51
A MUT 19
OPEN 6
BUS SI 52
BUS SO
SRST
BUS CLK
BUS SI
BUS ON
BU CHECK
UNI SO
LINK OFF
SIRCS
53
TO DISPLAY
SECTION
1
4
ATT
TO TUNER
SECTION
TO DISPLAY
SECTION
2
BUS ON 61
RESET 30
BU IN 60
SW501
(RESET)
S901
(RESET)
HSTX
RESET
1 2
IC902
BU 5V
BATT (H)
CHECK
Q920
BATT (L)
CHECK
BATT
86
RSTX
90 SIRCS 24
BU IN
77
SYS RST
6
BUS ON
14
UNI SO
18
UNI SI
17
UNI CKO
19
CD EJECTOR
58
CLOSE 7CD OPENREQ
59
ATT
5
BATT
10 3
RESET
13 2
BUS ON
CONT
12
9
8
11
1
4
6
BUS INTERFACE
IC802
CLK
DATA 5
4
6
2
1
3
8
7
CNP801
BUS
CONTROL IN
Q804
A
C
B
D
E
F
PD
LD
OPTICAL PICK-UP
KSS-720A
• Signal path
:CD
31
32
MUTE
CONT
Q411
Q805
Q806 Q801
CDX-M700R/M750
4-2. BLOCK DIAGRAM — CD SECTION —
(Page 43)
(Page 44)
(Page 44)

43 43
04
(ANTENNA) 110
2
ANT MPX
FL
RL
SR
ADL
19
AM IF
8
AMDET
9
RDS
ANT
TUNER UNIT
TU601
BUF
Q607
MUTE
CONTROL
Q604,606
NOISE
FILT
IC602
Q602 Q601
Q605
13
12
11
15
14
20
21
17
18
31
32
50
56
15
SYSTEM CONTROL
IC801 (2/3)
16
20
14
S METER VSM
NS MASK
52 MPTH
75 DAVN
QUALITY
TU ATT
VOL ATT
MUTE
QUAL
SCL
SDA
S METER
MP IV
AM
AM IF
MPX
24 OUTSSL
35 SWINR
33 AC INLR
34 ACIFLR
12
SDA IC 70 I2CSIO
13
SCL IC 71 I2CCKO
4
FM AGC 51 FM AGC
17
SDA ROM 10 E2PSIO
18
SCL ROM 11 E2PCKO
RDS DECODER
IC601
FM DET
XO
XI
S METER
4
5
X601
4.3MHz
9
RDS
SCL 10
MPTH 2
DAVN 8
130
SEL OUT FL
ELECTRONIC VOLUME
IC401
29
OUT RL
25
SWR
55
ST-BY
16
TEL ATT
95
ILL IN
81
ACC IN
73
X1A
74
X0A
84
TEST
83
PW ON
92
X0
93
X1
114
TU ON
ATT
TO DISPLAY
SECTION
3
TO CD
SECTION
4
IC409
7
2
12
13
PRE
AMP
IC402
Q202
Q201
Q403
Q410
MUTE
CONTROL
Q401, 402
12
5
3
11
22
4
9
7
POWER AMP
IC903
MUTE
STBY
CNP901
FL+
FL–
RL+
RL–
ATT
ILL
ACC
TEST
FR+
13
14
7
15
4
10
2
9
1
12
3
11
COM 8V
FR–
RR+
RR–
5AMP REM
6ANT REM
16 BATT
X802
32kHz
X801
3.68MHz
ILL
DET
Q902
POWER
CONT
Q461
ACC
DET
Q918
POWER
CONT
Q905, 919
Q923 R-CH
BATT
BATT
MD +B
TU 8V
POWER
CONT
Q924, 925
MD +B
Q917
Q901
PJ402
PJ401
–1
–2R
L
SUB OUT (MONO)
–3
–4R
LLINE OUT
REAR
R-CH
–5
–6R
LLINE OUT
FRONT
R-CH
–1
–2R
L
BUS AUDIO IN
R-CH
53
(M700R)
(M750)
(M700R)
(M750) FL
RL
F901
•Signal path
: FM
: AM/MW
4-3. BLOCK DIAGRAM — TUNER SECTION —
(Page 42)
(Page 44)
CDX-M700R/M750

4444
04
BUS SI
BUS CLK
BUS ON
BU CHECK
EMPH
LINK OFF
SIRCS
S RST
UNI SO
BUF
IC303 7
IR
RECEIVE
IC501
2
IR
RECEIVE
IC903
1
6
LCD DRIVER
IC901
100 9997 98
100 9997 98
84
85
86
X351
18.43MHz
INH CLK DATA CEO
INH
CLK
DATA
CEO
DIMMER
85
86
XTAL
LINK OFF
RES
NMI
BU IN
BUS ON
UNI SCK
UNI SI
UNI SO
EXTAL
66 CEO
69 INH
64 CLK
70 52
CEI
LCD9V
LCD9V
ILL ON
MD +B
33
SP LAT
62
RX
46
LED SW1
47
LED SW2
57
BOOT
SB-SI
DSP CLK
60
TX/FL-SO
SW1
SW2
POWER
CONT.
Q907,908
VREF
CONT.
Q303,304
I
DET
Q302
SHIFT
Q909
POWER
CONT.
Q903, 904
POWER
CONT.
Q912, 916
POWER
CONT.
Q913, 915
LED
DRIVE
Q501,502
REG
IC306
POWER
CONT.
Q901,902
POWER
CONT.
Q903,904
MT +B
KEY IN
MATRIX
KEY
ACTIVE
Q921
AD ON
CONT.
Q807
BATT
AD ON
BU 5V
BU 5V
MD 5V
BATT
BATT
LCD 9V
LCD 9V
MT +B
FLASH W
CLOSE SW
RT
INA1
SHIFT
OPEN SW
I DET
FPCRTL
MOT–
MOT+
FLSWPWON
FLS SO
FLS SI
SP LATCH
LED SW1
LED SW2
BOOT
BATT
A 3.3V
MD 5V
D 3.3V
DSP 5V
BZ801
BU 5V
98 61
63
101
38
49
82
81
50
97
DISPLAY CONTROL
IC301
TO CD
SECTION
2
LCD902
LCD901
LCD DRIVER
IC902
Q906 Q905
CN502
ILL ON 9V
TX (SO)
RX (SI)
FL SW
1 3
I
DET
IC308
3 7
2
MOTOR
DRIVE
IC307
3
14
16
11
6
12
SW900
(OPEN/CLOSE)
40
96
99
37
BEEP
DRIVE
Q803
BEEP
ON/OFF
DRIVE
Q906
15
MD2 89
DSP ON
108
CDON IN
16M
CD ON
MD ON
76
3.3V
REG
IC904
MD1
MD +B
ON/OFF
DRIVE
Q911
88 1 2
BU 5V
REG
IC905
1 2
AND
IC352
BCK
LRCK
DATA
DSPMST
4
1
2
3.3V
REG
IC305
3.3V
REG
Q301
4 6
69
100
82
4
KEY IN1
47
KEY IN0
46
RC IN1
72
KEY ACK
79
RC IN0
48
12
115
116
106
13
98
97
2
3
OUT1 7
9
OUT2 10
INA2 14
VCC
DC/DC CONV.
CONTROL
IC901
CD 5V
REG
Q914
MCKO
58
BCK
75
LRCK
76
DATA
R-CH
R-CH(RR)
R-CH(FR)
ADL
SR
71
MST/SLV
77
REDY
60
XLAT
62
DSP RST
57
SCK
59
TRDT
61
RVDT
63
29
READY 78
LAT 35
RST
DSP 36
CKO 27
SI 25
SO 26 DAILO 27
DA3RO 54
DA1RO 29
DA3LO 52
DA2RO 43
ADL IN 35
ADR IN 46
MCK0 40
MCK1 41
5 6
2 3
9 8
LATCH
IC304
DSP
IC302
SYSTEM CONTROL
IC801 (3/3)
IC406
RL
IC405
FL
IC405
X302
16MHz
TO TUNER
SECTION
3
CNP803
(REMOTE IN)
M601
OPEN/CLOSE
MOTOR
TO CD
SECTION
1
SW504
Z
•Signal path
: FM
: CD
OPEN
CLOSE
4-4. BLOCK DIAGRAM — DISPLAY SECTION —
(Page 42)
CDX-M700R/M750
(Page 43)
(Page
42)

45 45
tuner unit
(TU601)
DISC IN SW board
SWITCH board
DISPLAY board
SERVO board
LIMIT SW board
MAIN board
SUB board
4-5. CIRCUIT BOARDS LOCATION THIS NOTE IS COMMON FOR PRINTED WIRING
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. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•f: internal component.
•C: panel designation.
•U: B+ Line.
• Powervoltageis dc 14.4Vandfed with regulateddcpower
supply from ACC and BATT cords.
• Voltages aretaken with aVOM (Inputimpedance 10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
f: AM/MW
J: CD
for printed wiring boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•a: Through hole.
•b: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side: Partsonthepatternfaceside seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
• Waveforms (MODE:PLAY)
1
2
3
Approx. 620mVp-p
IC1 qf (FE)
0V
IC1 qh (RFO)
1.2Vp-p
Approx. 200mVp-p
IC1 qd (TE)
0V
4
5
6
7
8
IC501 uj (LRCK)
IC501 ul (PCMO)
IC501 ia (BCK)
16.89MHz
IC501 ih (XTAI)
10MHz
IC5 ea (X IN)
5Vp-p
5Vp-p
5.7Vp-p
3.8Vp-p
2Vp-p
22.7µsec
474nsec
474nsec

4848
• Refer to page 45 for Waveforms.
4-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION (1/2) — • Refer to page 60 for IC Block Diagrams.
(Page 52)
Note:
• Voltage and waveforms are dc
with respect to ground
under no-signal conditions.
no mark : CD PLAY
∗: Impossible to measure
(Page 49)
(Page 49)
CDX-M700R/M750

49 49
Note:
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
∗: Impossible to measure
(Page 48)
(Page 48)
• Refer to page 45 for Waveforms.
4-8. SCHEMATIC DIAGRAM — CD MECHANISM SECTION (2/2) — • Refer to page 60 for IC Block Diagrams.
CDX-M700R/M750

5252
D411, 412
CRZ22 (M700R)
CRS02 (M750)
4-10. SCHEMATIC DIAGRAM — MAIN SECTION (1/4) — • Refer to page 60 for IC Block Diagrams.
Note:
• Voltage is dc with respect to ground under
no-signal (detuned) condition.
no mark : FM
< > : CD PLAY
(Page 54)
(Page 53)
(Page 55)
CDX-M700R/M750
(Page 48)
Ver 1.3 2001. 05

53 53
4-11. SCHEMATIC DIAGRAM — MAIN SECTION (2/4) — • Refer to page 60 for IC Block Diagrams.
(Page 55)
(Page 52)
(Page 54)
Note:
• Voltage is dc with
respect to ground under
no-signal (detuned)
condition.
no mark : FM
( ) : AM/MW
CDX-M700R/M750

5454
4-12. SCHEMATIC DIAGRAM — MAIN SECTION (3/4) — • Refer to page 60 for IC Block Diagrams.
Note:
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(Page 55)
(Page 52) (Page 53)
CDX-M700R/M750