Sony MEX-BT4700U / MEX-BT4750U Service Manual ▷ View online
MEX-BT4700U/BT4750U
17
3-7. CHASSIS (T) SUB ASSY
3-8. ROLLER ARM ASSY
chassis (T) sub assy
claw
two screws
(M
(M
1.7
× 2.5)
two screws
(M
(M
1.7
× 2.5)
washer
gear (RA1)
roller arm assy
spring (RAL)
spring (RAR)
MEX-BT4700U/BT4750U
18
3-9. CHASSIS (OP) ASSY
3-10. CHUCKING ARM SUB ASSY
chassis (OP) assy
tension spring (KF)
gear (LE1)
lever (D)
slider (R)
chucking arm sub assy
spring
Note 1: Have this portion receive the chassis.
Note 1: Have this portion receive the chassis.
Note 2: Be careful not to touch the turn table.
MEX-BT4700U/BT4750U
MEX-BT4700U/BT4750U
19
19
3-11. SLED MOTOR ASSY
3-12. OPTICAL PICK-UP BLOCK
3-13. OPTICAL PICK-UP
sled motor assy
sled motor assy
spring
spring
stand
(bottom view)
(bottom view)
stand
turn table
three serration screws
(M
(M
2
× 3)
three
serration
screws
(M
2
× 3)
Note 1: Place the stand with care not to touch the turn table.
Note 2:
Never remove these parts since they were adjusted.
Never remove these parts since they were adjusted.
Note for Assembly
Note 3: Take care to prevent the chassis from being bent
when tightening the three machine screws.
bearing (F)
bearing (R)
optical pick-up block
Note: Be careful not to touch the lens and hologram
terminal when removing the optical pick-up block.
(bottom view)
There is space at the end of the
leaf spring (sub guide) to avoid
contact with the slide.
leaf spring (sub guide) to avoid
contact with the slide.
pan tapping screw
(M
(M
1.4
× 2.5)
leaf spring (sub guide)
leaf spring (OP)
optical pick-up
lead screw assy
Notes for Assembly
Prevent the end of the
leaf spring (sub guide) from being
in contact with the OP slide base.
leaf spring (sub guide) from being
in contact with the OP slide base.
Prevent the end of the
leaf spring (sub guide) from being
in contact with the OP slide base.
leaf spring (sub guide) from being
in contact with the OP slide base.
(bottom view)
MEX-BT4700U/BT4750U
MEX-BT4700U/BT4750U
20
20
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM - AUDIO Section (1/2) -
• SIGNAL PATH
: USB
: CD PLAY
: AUDIO
: Bluetooth
: MIC
• R-ch is omitted due to same as L-ch.
CN971
(USB)
CN501
D400
2
3
CD MECHANISM
DECK
(MG-101Z-188//Q)
SENSOR
BOARD
SERVO BOARD
BT BOARD
(PATTERN ANTENNA)
MIC801
AU_LCH
RXD (MC-BUS)
CD_ON
CDM_ON
VBUS_ON
60 MC_TX
84 CD_ON
85 CDM_ON
75 VBUS_ON
84 CD_ON
85 CDM_ON
75 VBUS_ON
TXD (MC-BUS)
D- (USB)
D+ (USB)
59 MC_RX
XSYS_RST
BT_ON
BT_ON
SYS_RST
SYS_RST
BU_CHECK
BU_CHECK
AU_ATT
AU_RCH
R-CH
BT_AUDIO_L
BT_AUDIO_R
R-CH
Z_MUTE
EJECT_OK
WAKE_UP
62 Z_MUTE
70 EJECT_OK
43 WAKE_UP
70 EJECT_OK
43 WAKE_UP
88 XBT_MIC_SEL
51 XMD2
89 BT_MIC_DET
53 MD0
D801
D802
D472
D502
5
3
7
F_WRITE
(NC)
NCO
TX
4
RX
1
RESET
RESET
SWITCH
Q598
INVERTER
Q599
MUTING
CONTROL
Q493
78 FLASHEN1
2
CLK
61 XTEST_IN
INVERTER
Q597
XEXT_A
TT_XEN
42
AT
T
64
BT_MUTE
MUTING
CONTROL
Q490
BT_A
TT_XEN
74
MIC AMP
IC813 (1/2)
SYSTEM CONTROLLER
IC501 (1/3)
CENTER VOLTAGE
REGULATOR
IC813 (2/2)
AUDIO
+8.5V
MIC
+3.3V
+3.3V
MIC B+
MIC_IN-
MIC_IN+
MIC
AMP
IC814
MIC AMP
Q824, 825
MUTING
Q862
B+ SWITCH
Q820 - 822
MIC INPUT
SELECT
IC812
INVERTER
Q823
J801
EXTERNAL
MICROPHONE
BT_TEST1
BT_TEST2
BT_TEST2
BT_MFUNC
BT_FF
BT_FR
BT_TEST1
19
BT_TEST2
18
BT_MFUNC
10
BT_FF
3
BT_FR
2
BT_PLAY
BT_CVC
BT_INT-HF
BT_STATUS0
BT_STATUS1
BT_STATUS1
BT_PLAY
1
BT_CVC
97
BT_MUTE
BT_MUTE
94
BT_INT_HF
96
BT_OPRPOW
BT_POW_ON
BT_OPRPOW
11
BT_RESET
XBT_RESET
9
BT_STATUS_POW
12
BT_STATUS0
5
BT_STATUS1
6
BT_STATUS2
BT_STATUS2
7
BT_STATUS3
BT_STATUS3
8
BT-L
ATT
CD-L
A
MUTING
CONTROL
Q470, 471
+
DOOR_SW
D494
73
F_AUX
B
USB SELECT
SWITCH
IC971
USB ON/OFF
CONTROL
Q971
(Page
21)
(Page
22)
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