Kenwood KDC-BT7539U User manual

This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2008-5 PRINTED IN JAPAN
B53-0666-00 (N)429
SERVICE MANUAL
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
CD RECEIVER
KDC-BT7539U
Bluetooth
KDC-BT8041U
Bluetooth
KDC-BT838U
Bluetooth
KDC-BT8041U
KDC-BT8141UY
(E type)
KDC-BT838U
(K type)
SIZE AA BATTERY
(Not supplied)
Panel assy
(A64-4447-02)
MODEL TDF PANEL No. TDF NAME
KDC-BT838U Y33-2970-60 TDF-BT89D
KDC-BT8041U/BT8141UY Y33-2970-61 TDF-BT8041U
KDC-BT7539U Y33-2970-62 TDF-BT7539U
CD MECHANISM EXTENSIONCORD (30P) : E39-1014-05
DC cord (K,M type)
(E30-6428-05)
DC cord (E type)
(E30-6671-05)
Escutcheon
(B07-3245-01)
Mounting hardware assy
(J21-9716-03)
Remote controller assy
(A70-2085-05)
Lever
(D10-7012-04) x2
Carrying case (K,E type)
(W01-1710-05)
Compact disc
(W01-1723-15)
Screw set (K,M type)
(N99-1757-15)
Screw (K,M type)
(N84-4016-48)
Panel assy
KDC-BT8041U:
(A64-4445-02)
KDC-BT8141UY:
(A64-4446-02)
RC-547
Panel assy
(A64-4444-02)
Plastic cabinet assy (M type)
(A02-2755-13)
TDF SPARE-PANEL
Microphone
(W01-1718-05)
KDC-BT7539U
(M type)

2
KDC-BT7539U/BT8041U /BT8141UY/BT838U
BLOCK DIAGRAM
AM+B
FRONT-END
CD MECHA
PON5V
A8V
A8V
AGC
E-VOL
PRE
MUTE
IC
POWER
PRE OUT
AUX IN
IC451
RDS
DECODER
BU5V
A8V
SERVO+B
UP
BACK
RESET
IC
BU5V
u-COM
P-CON
ANT-CON
ACC DET
ILLUMI
BU5V
ILL+B
SW14V
A8V
SW5V
P-CON
ANT CON
ILLUMI
ACC
BACK UP
LINE MUTE
SP OUT
(FL/FR/RL/RR)
FL
RESET SW
LED
BU5V
PON5V
SERVO
A8V
ILL+B
ILL+B
(F/R SW)
WIRED REMO
LINE MUTE
LX BUS CONNECTOR
4P
USB5V
to USB u-COM
USB I/F
SW16V
SW16V
SW16V
USB
PAN5V
BU3.3V
IC1
IC700
IC601
IC501
SERVO
+B+B
FDC
FL+B
SW DC/DC
(FL)
(D5V)
DC/DC
SW
PAN5V
HI-SIDE
SW
FL+B
USB5V
VBUS OC
(BT3.3V)
DC/DC
PAN5V BT3.3V
DET
B.U/SERGE
SW
EJE/SRC
KEY MATRIX
KEY
ROM
CORR
ROTARY
ENCODER
REMOTE
CONTROL
DRIVER
LED
FL+B
u-COM
PANEL
LEVEL
SHIFT
AUTHENTICATION
iPod
u-COM
(USB/CD)
SUB
SYSTEM
VBUS OC
ROM CORR
PON5V
ROM CORR
DRIVER
MUTE
(K,M TYPE)
BU5V
MODULE
BLUETOOTH
BOOK
TEL
A8V
PON5V
+12dB/LPF
MIC
BT
BT3.3V
PANEL
OPEN/CLOSE
DET
SW14V
SW14V
(K,M TYPE)
E2PROM
FST
FM/AM
CD
SPE ANA
MUTE A
MUTE 0,1,2
WININ OFFSET
MUTE A
PWIC MUTE
for
MPX
RDS
DC ERR
MUTE 0,1,2
AUX
CH
MUTE C
MUTE C
STBY
PREM/SW M
I2S
I2S
DAC
MD(BT)
RST
RST
(X16- )
(X34- )
ANT

3
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
BLOCK DIAGRAM
DPU1
CD PLAYER UNIT (X32-6130-00) BOARD
MOTHER
(X34- )
EF
A
C
B
TR COIL
FO COIL
APC
IC4
16.934MHz
CLOCK
IC3
LOADING &
MOTOR
DRIVER
MOTOR
SPINDLE
S2
S1
S3
SLED
MOTOR
DM1
DM2
X1
Q1
RF AMP
SERVO
MP3 DECODER
WMA DECODER
1M bit SRAM
PROCESSOR
AAC DECODER
+
+
+
+
+
CR FILTER
CR FILTER
REVERSAL
CIRCUIT
Q13
BU1.5V REG
IC5
IC6
IC11
SW3.3V REG
SW1.5V REG
LOADING &
VREF
12EJE-SW
LOS-SW
LOE-SW
MOTOR
LO/EJ
A.GND
A8V
A,B,C,E,F
TR OUT
FO OUT
DM OUT
FM OUT
A3.3V
LD
SIGNAL
S.GND
S7.5V
FO OUT
TR OUT
DM OUT
FM OUT
DRV MUTE
SO
SRAMSTB
SI
BUCK
CCE
PIO0
SRAMSTB
BUCK
CCE
PIO0
SO
SI
MRST MRST
C88,R82
C87,R83
R-ch
L-ch L-ch
R-ch
ZDET MUTE L/R
D.GND
D GND BU1.5V SW1.5V SW3.3V
AGND
BU5V
P.ON
PD
BSIF LRCK
BSIF ST REQ
BSIF GATE
BSIF BCK
BSIF DATA
BSIF ST REQ
BSIF GATE
BSIF DATA
BSIF BCK
BSIF LRCK
8EJE-SW

4
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
●SWITCH UNIT (X16-638x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Panel μ-COM
IC3 Remote Control IC Remote control receiver
Q1 Triangle Red LED SW Triangle LED lights when Q1’s base level goes Hi.
Q3 Blue LED SW (Vol left) Blue LED brightness control (PWM).
Q4 Blue LED SW (FL Top & ATT Key) Blue LED lights when Q4’s base level goes Hi.
Q5 Blue LED SW (FL under) Blue LED brightness control (PWM).
Q6 Blue LED SW (Multi function Key) Blue LED brightness control (PWM).
Q11 VFD Filament Voltage (-) VFD Cut-off bias (5-7.5V) supply.
●ELECTRIC UNIT (X34-597x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC11 Audio8V Ref Power Supply Output 1.27V.
IC21 Regulator Power supply for IC700. (USB μ-com)
IC61 Switching Regulator Power supply for D5V. (to USB/PANEL)
IC71 Switching Regulator Power supply for FL+B. (to PANEL)
IC211 Hi-side SW Detection of USB Over Current
IC301 RDS decoder IC RDS decoder. (only E type)
IC331 OPAMP For AGC of the Spectrum Analyzer
IC451 Eelectrical Volume & Source Selecter Controls the source, volume, and tone.
IC501 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC601 System μ-com Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone.
IC602 Reset IC “L” when detection voltage goes below 3.6V or less.
IC603 ROM CORRECTION For Main program correcting emergency (EEP_ROM)
IC604 Muting logic IC Controls logic for muting.
IC605 Logic IC Level Shift (3.3V→5V)
IC607 Logic IC Level Shift (5V→3.3V)
IC608 EEP_ROM Memory of TEL BOOK for “Blue Tooth”
IC700 Sub μ-com USB/CD mechanism control
IC750 iPod Authentication Coprocessor iPod Authentication
IC751 ROM CORRECTION For USB program correcting emergency (EEP_ROM)
IC964 OP AMP +12dB Gain AMP & L.P.F for BT Output
IC965 Switching Regulator Power supply for BT3.3V. (to BT Module)
Q11 Audio8V AVR When Q13 & Q12’ go ON, A8V AVR outputs 8.0V.
Q12 Audio8V AVR SW When Q13’Base goes Hi, Supply current to IC11.
Q13 Audio8V AVR SW When Q13’Base goes Hi, Q12 & Q11 are ON.
Q21,22 B.U.5V AVR While BU is applied, BU5V AVR outputs +5V.
Q23,24 PON5V When Q24’base goes Hi, PON5V outputs +5V.
Q31,32 SERVO+B AVR When Q33 & Q34’ go ON, AVR outputs 8V.
Q33,34 SERVO+B SW When Q34’Base goes Hi, Q33 is ON.
Q41,42 Illumination+B AVR When Q43 & Q44’ go ON, AVR outputs 10V.
Q43,44 Illumination+B SW When Q44’Base goes Hi, Q43 is ON.
Q51,52 SW16V When Q9 & Q34’ go ON, The voltage appears. (~16V)
Q71,72 FDC+B AVR When Q43 goes ON, AVR outputs 9V. (FL Filament)
Q81,82 FL+B SW When Q81’Base goes Hi, FL+B outputs 53V.
COMPONENTS DESCRIPTION

5
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
Ref. No. Application / Function Operation / Condition / Compatibility
Q121 B.U Detected SW When Q121’base gose Hi, B.U voltage is detected.
Q122 Surge Detect SW When Q122’base goes Hi, Surge voltage is detected.
Q123 ACC Detect SW When Q123’base gose Hi, Acc voltage is detected.
Q141,144 P-CON SW When Q144’base goes Hi, AVR outputs 14V.
Q142,143 P-CON Protect Protect Q141 by turning on when P-CON output is grounded.
Q145,146 Power Antenna SW When Q146’base goes Hi, power antenna switch outputs 14V.
Q151 Small-lamp Detect SW When Q151’base goes Hi, Small-lamp is detected.
Q321,322 AM+B SW When Q322’base gose Hi, AM+B is outputs.
Q331 AGC CONTROL (for SPE. ANA.) AGC GAIN CONTROL
Q401~406 Pre-out mute SW When a base gose Hi, Pre-out is set to mute.
Q407,408 Pre-out mute driver When a base gose Lo, mute driver is turned on.
Q602,603 LEVEL SHIFT System μ-com (5V) to Sub μ-com (3.3V)
Q680 Invertor When a base gose Hi, BT RESET is ON.
Q681,682 PANEL +5V SW When Q682’base gose Hi, PANEL +5V is outputs.
Q683,684 LEVEL SHIFT CD mechanism (3.3V) to Sysytem μ-com (5V)
Q702,703 3.3V_AVR_for_IC700 (flash_type) When base of Q702 is “H”, 3.3V_On.
Q704 Decoder SRAM standby control Buffer When base of Q704 is “L”, SRAM_STBY.
Q705 CD “LOE_LIM” SW_Buffer When base of Q705 is “H”, Loading_End.
Q900 L.P.F L.P.F for BT Output (Rch)
Q901 L.P.F L.P.F for BT Output (Lch)
●CD PLAYER UNIT (X32-6130-00)
Ref. No. Application / Function Operation / Condition / Compatibility
IC3 4ch BTL Driver Driver for focusing & tracking coil, driver for sled & spindle motor, and operation
for disc loading & ejection.
IC4 Servo DSP with built-in Audio DAC With built-in MP3/WMA/AAC decoder and 1M-bit-SRAM.
IC5 D1.5V REG. Power supply for digital 1.5V.
IC6 D3.3V REG. Power supply for digital 3.3V.
IC11 BU1.5V REG. Power supply for back-up 1.5V.
Q1 APC (Auto Power Control) Drives LD (Laser Diode).
Q13 Inverter Inverts ZDET signal.
D2 Laser Diode Protection Prevents reverse bias which is applied to laser. Laser destruction prevention.
D3,4 Static Electricity Countermeasure Prevents malfunction by static electricity.
COMPONENTS DESCRIPTION