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Model
MEX-BT3800U MEX-BT3807U MEX-BT3850U MEX-BT38UW
Pages
50
Size
3.23 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
mex-bt3800u-mex-bt3807u-mex-bt3850u-mex-bt38uw.pdf
Date
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MEX-BT38UW/BT3800U/BT3807U/BT3850U
37
•  IC Pin Function Description
MAIN BOARD  IC501  MB90F058PF-G-111-JNE1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
BT_PLAY
O
Key signal output to the Bluetooth section
2
BT_FR
O
Key signal output to the Bluetooth section
3
BT_FF
O
Key signal output to the Bluetooth section
4
BT_POWER_CTRL
O
Main power on/off control signal output terminal for the Bluetooth section    “H”: power on
5 to 8
BT_STATUS0 to 
BT_STATUS3
I
Status input from the Bluetooth section
9
XBT_RESET
O
Reset signal output to the Bluetooth section    “L”: reset
10
BT_MFUNC
O
Key signal output to the Bluetooth section
11
BT_OPRPOW
O
Key signal output to the Bluetooth section
12
BT_STATUS_POW
I
Power supply status input from the Bluetooth section    “H”: Bluetooth power on
13
X_OUT
O
Sub system clock output terminal (32.768 kHz)
14
X_IN
I
Sub system clock input terminal (32.768 kHz)
15
VCC
-
Power supply terminal (+3.3V)
16
VSS
-
Ground terminal
17
C
-
Not used
18
BT_TEST2
O
Test mode setting terminal for the Bluetooth test mode 2
19
BT_TEST1
O
Test mode setting terminal for the Bluetooth test mode 1
20
XNOSE_SW
I
Front panel remove/attach detection signal input terminal    “L”: front panel is attached
21
XDOOR_SW
I
Front panel remove/attach detection signal input terminal    “L”: front panel is attached    Not 
used
22
I2C_SIO
I/O
IIC two-way data bus
23
I2C_SCK
O
IIC data transfer clock signal output terminal
24
DOOR_IND
O
LED drive signal output terminal    Not used
25
CYRIL_SEL
I
Cyrillic letter response setting terminal    “H”: corresponds to Cyrillic letter
26, 27
RE_IN0, RE_IN1
I
Jog dial pulse input from the rotary encoder
28 to 30
AREA_SEL2 to 
AREA_SEL0
I
Setting terminal for the destination
31
B_OUTSEL
I
Blackout setting terminal    “H”: blackout effective
32
AVCC
-
Power supply terminal (+3.3V)
33
AVRH
I
Reference voltage (+3.3V) input terminal
34
XRC_IN1
I
Rotary remote commander shift key input terminal
35
AVSS
-
Ground terminal
36
SA_IN
I
Spectrum analyzer display data select signal input terminal    Not used
37
VSM
I
FM and AM signal-meter voltage detection signal input from the PLL
38
TU_ATT
O
Tuner muting on/off control signal output terminal    Not used
39, 40
KEY_IN1, KEY_IN0
I
Front panel key input terminal 
41
RC_IN0
I
Rotary remote commander shift key input terminal
42
XEXT_ATT_XEN
O
Muting on/off control signal output terminal
43
WAKE_UP
O
Wakeup signal output to the CD section
44
VSS
-
Ground terminal
45
XKEY_ACK0
I
Acknowledge signal (wake up signal) input terminal for the rotary remote commander    On at 
input of “H”
46
XKEY_ACK1
I
Acknowledge signal (wake up signal) input terminal for the front panel key    On at input of “H”
47
DAVN
I
Synchronize detection signal input terminal    Not used
48
LCD_CE
O
Chip enable signal output to the liquid crystal display driver
49
LCD_SO
O
Serial data output to the liquid crystal display driver
50
LCD_SCK
O
Serial data transfer clock signal output to the liquid crystal display driver
51 to 53
XMD2, MD1, MD0
I
Operation mode setting terminal
54
XRESET
I
System reset signal input from the reset signal generator and reset switch    “L”: reset
55
UNISI
I
SONY bus data input from the SONY bus interface
56
UNISO
O
SONY bus data output to the SONY bus interface
57
UNISCK
O
SONY bus clock signal output to the SONY bus interface
58
RDS_ON
O
Power on/off control signal output terminal    Not used
59
MC_RX
I
Serial data input from the CD section
60
MC_TX
O
Serial data output to the CD section
61
XTEST_IN
-
Not used
62
Z_MUTE
I
Muting on/off control signal input from the CD section
MEX-BT38UW/BT3800U/BT3807U/BT3850U
38
Pin No.
Pin Name
I/O
Description
63
XILL_IN
I
Illuminate line detect signal input for the auto dimmer control    Dimmer is present at input of 
“L”    Not used
64
ATT
O
Muting on/off control signal output terminal
65
VCC
-
Power supply terminal (+3.3V)
66
VSS
-
Ground terminal
67
BU_CHECK
I
Back up power supply detection signal input terminal    “L” is input at low voltage
68
AMP_STB
O
Standby control signal output to the power amplifi er
69
XDIAG
I
Diagnostic signal input from the power amplifi er
70
EJECT_OK
I
CD eject OK signal output to the CD section
71
SA_OUT
O
Serial data output terminal    Not used
72
SA_CLK
O
Serial data transfer clock signal output terminal    Not used
73
F_AUX
O
Muting on/off control signal output terminal    Not used
74
BT_ATT_XEN
O
Muting on/off control signal output terminal for the Bluetooth section
75
VBUS_ON
O
Power on/off control signal output terminal for the CD section
76
XUSB_OVR
I
Over voltage detection signal input terminal for USB power supply section
77
FLASH_EN0
-
Not used
78
FLASH_EN1
-
Not used
79
USB_ON
O
Power on/off control signal output terminal for the USB section
80
DD_ON
O
Power on/off control signal output terminal for the USB section
81
TEL_ATT
I
Telephone muting detection signal input terminal    At input of “H”, the audio signal is attenu-
ated by 20 dB
82
XACC_IN
I
Accessory power detection signal input terminal    “L”: accessory power on
83
XBUS_ON
O
SONY bus on/off control signal output to the SONY bus interface
84
CD_ON
I
CD servo power supply control request input terminal
85
CDM_ON
I
CD mecha power supply control request input terminal
86
XSYS_RST
O
Reset signal output terminal
87
BT_MIC_POW
O
Microphone power on/off control signal output for the Bluetooth section    “L”: power on
88
XBT_MIC_SEL
O
Microphone selection signal output terminal
89
BT_MIC_DET
I
Microphone detection signal input terminal for the EXTERNAL MICROPHONE jack
90
VCC
-
Power supply terminal (+3.3V)
91
VSS
-
Ground terminal
92
OSC_OUT
O
Main system clock output terminal (7.92 MHz)
93
OSC_IN
I
Main system clock input terminal (7.92 MHz)
94
BT_MUTE
I
Muting on/off control signal input from the Bluetooth section
95
SIRCS
I
Remote control signal input from the remote control receiver
96
BT_INT-HF
I
HF operation notifi cation signal input from the Bluetooth section    “H” active
97
BT_CVC
O
CVC selection request signal output to the Bluetooth section
98
ZAPPIN_BEEP
O
Beep sound drive signal output to the ellectrical volume
99
SYNC_OUT
O
Synchronize signal output terminal    Not used
100
BEEP
O
Beep sound drive signal output to the power amplifi er
39
MEX-BT38UW/BT3800U/BT3807U/BT3850U
SECTION  5
EXPLODED  VIEWS
 1 
X-2342-713-3 PANEL 
ASSY, 
SUB
 2 
3-042-244-11 SCREW 
(T)
 3 
X-2179-399-1 LOCK 
ASSY 
(S)
 4 
3-042-244-01 SCREW 
(T)
  5 
2-898-980-01  HOLDER (MIC SLOT)
  6 
1-834-740-11  LEAD WIRE WITH CONNECTOR
  7 
3-376-464-11  SCREW (+PTT 2.6X6), GROUND POINT
  8 
A-1743-350-A  MAIN BOARD, COMPLETE (Including BT board)   
(BT38UW/BT3800U: US, CND)
  8 
A-1743-352-A  MAIN BOARD, COMPLETE (Including BT board)   
(BT3800U: AEP, UK)
  8 
A-1743-353-A  MAIN BOARD, COMPLETE (Including BT board)   
(BT3807U)
  8 
A-1743-354-A  MAIN BOARD, COMPLETE (Including BT board)   
(BT3850U: E)
  8 
A-1743-355-A  MAIN BOARD, COMPLETE (Including BT board)   
(BT3850U: EA)
  9 
A-1641-142-A  BT BOARD, COMPLETE (Included in MAIN board)
 10 
3-264-798-01 CAP
  11 
1-831-838-11  CORD (WITH CONNECTOR) (ISO) (POWER)    
(BT3800U: AEP, UK/BT3807U)
  11 
1-837-531-21  CONNECTION CORD FOR AUTOMOBILE  
 
(POWER) (BT38UW/BT3800U: US, CND/BT3850U)
  12 
3-250-543-21  SCREW (+B P-TITE M2)
  13 
X-2189-557-1  PLATE (MIC SLOT) (SV) ASSY
  FU701 
1-532-877-11  FUSE (BLADE TYPE) (AUTO FUSE) (10A/32V)
  J401 
1-833-887-11  CONNECTION CORD (RCA) (SUB OUT (MONO))
  J801 
1-836-313-22  CORD, CONNECTION (MIC) (MIC IN)
 MIC801 1-542-689-31 MICROPHONE
  #1 
7-685-792-09  SCREW +PTT 2.6X6 (S)
  #2 
7-685-790-01  SCREW +PTT 2.6X4 (S)
  #3 
7-685-793-09  SCREW +PTT 2.6X8 (S)
  #4 
7-685-794-09  SCREW +PTT 2.6X10 (S)
  #5 
7-685-134-19  SCREW +P 2.6X8 TYPE2 NON-SLIT
  Ref. No. 
Part No. 
Description 
Remark
  Ref. No. 
Part No. 
Description 
Remark
Note:
•  -XX and -X mean standardized parts, so 
they may have some difference from the 
original one.
•  Items marked “*” are not stocked since 
they are seldom required for routine ser-
vice. Some delay should be anticipated 
when ordering these items.
•  The mechanical parts with no reference 
number in the exploded views are not sup-
plied.
•  Color Indication of Appearance Parts Ex-
ample:
  KNOB, BALANCE (WHITE) . . . (RED)
   
 
 
   
 
Parts Color  Cabinet’s Color
• Abbreviation
  CND  : Canadian model
  EA 
: Saudi Arabia model
5-1.  MAIN  SECTION
The components identifi ed  by  mark  0 
or dotted line with mark 0 are critical for 
safety.
Replace only with part number specifi ed.
Les composants identifi és par une marque 
0 sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant 
le numéro spécifi é.
Note: When the BT board is replaced, it is necessary to confi rm operation. Refer to “BLUETOOTH FUNCTION 
CHECKING METHOD USING A CELLULAR PHONE” of the servicing note (See page 6).
not supplied
not
supplied
CD mechanism
deck section
(MG-101Z-188//Q)
front panel section
not supplied
MAIN board
1
#1
#1
#1
#1
#2
#3
#3
#3
#3
#4
#4
#5
#5
FU701
J401
J801
not supplied
not supplied
not supplied
not supplied
MIC801
2
3
13
4
5
6
7
7
7
8
9
11
12
10
not supplied
(ANTENNA board)
A
B
C
C
B
D
D
A
#4
40
MEX-BT38UW/BT3800U/BT3807U/BT3850U
5-2.  FRONT  PANEL  SECTION
  51 
X-2515-264-1  BUTTON ASSY (S) (BT3800U: AEP, UK/BT3807U)
 51 
X-2515-265-1 BUTTON 
ASSY 
(S) 
(BT38UW/BT3800U: US, CND/BT3850U)
  52 
3-250-543-21  SCREW (+B P-TITE M2)
  53 
X-2515-266-1  PANEL (SV) ASSY, FRONT (BT3800U: US, CND)
  53 
X-2515-267-1  PANEL (SV) ASSY, FRONT (BT38UW)
  53 
X-2515-268-1  PANEL (SV) ASSY, FRONT (BT3800U: AEP, UK)
  53 
X-2515-269-1  PANEL (SV) ASSY, FRONT (BT3807U)
  53 
X-2515-270-1  PANEL (SV) ASSY, FRONT (BT3850U)
  54 
X-2514-264-1  KNOB (VOL) (SV) ASSY
 55 
2-639-881-01 SPRING 
(RELEASE)
  56 
1-780-789-12  CONDUCTIVE BOARD, CONNECTION
 57 
4-144-557-01 ILLUMINATOR 
(LCD)
 58 
4-141-754-01 PANEL, 
BACK
  59 
X-2187-544-3  CASE ASSY (BT3800U: AEP, UK/BT3807U/ 
 
BT3850U)
  60 
A-1743-361-A  PANEL COMPLETE ASSY, FRONT 
(BT3800U: AEP, UK)
  60 
A-1743-367-A  PANEL COMPLETE ASSY, FRONT 
(BT3800U: US, CND)
  60 
A-1743-373-A  PANEL COMPLETE ASSY, FRONT (BT38UW)
  60 
A-1743-380-A  PANEL COMPLETE ASSY, FRONT (BT3807U)
  60 
A-1743-386-A  PANEL COMPLETE ASSY, FRONT (BT3850U)
  CN901 
1-820-619-11  PLUG, CONNECTOR 20P
  CN902 
1-822-798-11  USB CONNECTOR (   )
  LCD901  1-802-992-11  DISPLAY PANEL, LIQUID CRYSTAL
  RE901 
1-479-902-32  ENCODER, ROTARY (PUSH ENTER/SELECT/   )
  Ref. No. 
Part No. 
Description 
Remark
  Ref. No. 
Part No. 
Description 
Remark
Note: Refer to the servicing notes “NOTE FOR REPLACEMENT OF THE USB 
CONNECTOR (CN902)” (See page 5), if replacing the Ref. No. CN902.
59
LCD901
RE901
not supplied
not supplied
not supplied
not supplied
not supplied
(KEY board)
51
53
54
55
56
57
58
52
52
60
not supplied
CN901
CN902
not supplied
(JACK board)
not supplied
(for FRONT PANEL)
(BT38UW/BT3800U: US, CND)
(BT3800U: AEP, UK/BT3807U/BT3850U)
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