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

6
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
●SYSTEM μ-COM: 30626FHP3A7GP (X34-597: IC601)
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
1 WIRED_REMO I Remote controller input Pulse width detection
2 RDS_QUAL I RDS decoder QUAL input terminal
2 NC O Not used (Models without RDS) Output is fixed to L
3 S_SYS_DATA O Data from system μ-com to SOC
(System μ-com →SOC) 400k
3 CD_SI O CD mechanism serial output
4 S_SOC_DATA I Data from SOC to system μ-com
(SOC →System μ-com) 400k
4 CD_SO I CD mechanism serial input
5 S_SOC_CLK I Host is SOC, CLK from SOC 400k
5 CD_CLK O 6E Mechanism serial clock output f=1MHz
6 BYTE
7 CNVSS
8 XCIN 32,768Hz
9 XCOUT 32,768Hz
10 RESET
11 XOUT 12MHz
12 VSS
13 XIN 12MHz
14 VCC1
15 NMI I Not used
16 RDS_CLK I RDS clock input terminal RDS clock input terminal
16 NC O Not used (Models without RDS) Output is fixed to L
17 PANEL_DET I Panel connector attach/detach detection
terminal H: Panel detach, L: Panel attach
18 SRC_KEY I Source key input H: OFF, L: ON
19 RDS_DATA I RDS decoder DATA input terminal
19 NC O Not used (Models without RDS) Output is fixed to L
20 CD_DRIVEMUTE O CD motor driver mute output
20 NC O Not used (Models with USB) Output is fixed to L
21 EJECT_KEY I Eject key input H: OFF, L: ON
22 PANRST O Panel reset terminal H: Normal, L: Reset
23 CD_PIO0 I
Command I/F
Communication request terminal from
mechanism DSP
H: Data request
23 NC O Not used (Models with USB) Output is fixed to L
24 PON_CD I/O CD mechanism power supply control H: CD mechanism power supply ON
Hi-Z: Power supply OFF
24 NC O Not used (Models with USB) Output is fixed to L
25 F_SEL1 I/O SW_REG frequency setup terminal 1
(Models with BT)
H: When receiving MW
Hi-Z: When receiving other frequency than MW
25 NC O Not used (Models without BT) Output is fixed to L
26 PWIC_BEEP O Beep output 2kHz 1kHz
27 TUN_SCL I/O F/E I2C clock I/O terminal MAX 400k
28 TUN_SDA I/O F/E I2C data I/O terminal MAX 400k
29 PAN_SYS_DATA O Data from system μ-com to panel
(System μ-com →Panel) UART MAX 500k

7
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
30 PAN_PAN_DATA I Data from panel to system μ-com
(Panel →System μ-com) UART MAX 500k
31 PAN_SYS_REQ O Communication request from system
μ-com to panel (System μ-com →Panel)
32 PAN_PAN_REQ I Communication request from panel to
system μ-com (Panel →System μ-com)
33 BT_SYS_DATA O Data from system μ-com to BT module
(System μ-com →BT module)
33 NC O Not used (Models without BT) Output is fixed to L
34 BT_BT_DATA I Data from BT module to system μ-com
(BT module →System μ-com)
34 NC O Not used (Models without BT) Output is fixed to L
35 NC O Not used Output is fixed to L
36 PON_ILL I/O Panel LED
FL bias power supply control
H: Power ON
Hi-Z: When panel is detach and power is OFF
37 NC O Not used Output is fixed to L
38 PON_PANEL I/O Power supply for panel μ-com
Supply FL_VDD
H: Power ON
Hi-Z: When panel is detach and power is OFF
39 ROMCOR_DET I ROM correction writing request H: Can re-write ROM correction (I2C open)
39 EPM I
EPM input terminal for re-writing
Rewritable when EPM input terminal is “L”
when starting to re-write.
40 CD_MOTOR O CD motor control terminal
41
CD_LOE_LIM_SW I CD detection terminal (Chucking SW) H: Loading completed, L: No disc
42 CD_LOS_SW I CD loading detection terminal L: Ejection completed
43 CD_DISC12_SW I CD disk detection terminal (12cm) L: 12cm disc
44 PAN_SC_CON O Panel operation control terminal
CE when re-writing system μ-com H: In normal condition, L: Stop the panel
45 CD_LOEJ I/O CD motor control terminal
46 S_SOC_REQ I Communication request from SOC to
system μ-com (SOC →System μ-com)
46 NC O Not used (Models without USB) Output is fixed to L
47 SOC_SSTOP O SOC stop terminal H: Normal, L: Stop SOC
47 CD_SRAMSTB O Decoder SRAM STANDBY control
(Models without USB) L: SRAM standby (6E**)
48 SOC_SRST O SOC reset terminal H: Normal, L: Reset (Bolero)
48 CD_RST O CD mechanism μ-com RST terminal H: Normal, L: Reset
49 S_SYS_REQ O Communication request from system
μ-com to SOC (System μ-com →SOC)
49 CD_CCE O Command I/F
CD mechanism chip enable terminal
50 SOC_MUTE I DAC mute request H: Mute request, L: In normal condition
50 CD_MUTE I DAC mute request L: Mute request, H: In normal condition
51 PON_D5V I/O For USB /FDC 5V power supply control
terminal H: ON, Hi-Z: OFF
52 PON I/O Power supply control terminal H: ON, Hi-Z: OFF
53
OEM_DISP_DATA I/O External display DATA External display
53 NC O Not used (Models without BT/Models
without OEM_DISP) Output is fixed to L

8
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
54 OEM_DISP_CLK I/O External display CLK External display
54 NC O Not used (Models without BT/Models
without OEM_DISP) Output is fixed to L
55 OEM_DISP_CE I/O External display control request External display
55 NC O Not used (Models without BT/Models
without OEM_DISP) Output is fixed to L
56 P_CON I/O PCON control terminal POWER ON: H, POWER OFF: Hi-Z
STBY source: Hi-Z
57 ANT_CON O ANTCON control terminal TUNER source (including while receiving RDS): H
POWER OFF: L, STBY source: L
58 NC O Not used (Models without EXT_AMP) Output is fixed to L
59 ILLUMI_DET I Dimmer illumi detection L: ON, H: OFF
60 VCC2 -
61 MUTE_0 O EVOL FRONT MUTE control L: Mute ON, Independent setup of time constant 10ms,
H: In normal condition
62 VSS -
63 MUTE_1 O EVOL REAR MUTE control L: Mute ON, Independent setup of time constant 10ms,
H: In normal condition
64 MUTE_2 O IC-2 SW MUTE control
L: Mute ON, Independent setup of time constant 10ms,
H: In normal condition, Shall be shared with MUTE_
PRE_SW, IC2 shock noise measure
65 LINE_MUTE I Line mute detection TEL MUTE: 1V or less, NAVI MUTE: 2.5V or more
66 NC O Not used Output is fixed to L
67 BT_RST O BT module reset terminal H: Normal, H: BT reset
67 NC O Not used (Models without BT) Output is fixed to L
68 NC O Not used Output is fixed to L
69 MUTE_SA I/O IC-2 MUTE_A control
Spectrum analyzer MUTE
L: Mute ON, Independent setup of time constant 0.5ms,
Hi-Z: In normal condition
70 PWIC_DC_DET I DC offset detection terminal
71 ACC_DET I ACC detection ACC detected: L, ACC not detected: H
72 BU_DET I BU detection BU detected: L
BU not detected/Reduced voltage/Over-voltage: H
73 LX_REQ_S I Communication request from slave unit
73 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
74 MUTE_AFS I/O IC-2 MUTE_C control
AFS MUTE
L: Mute ON, Independent setup of time constant 0.5ms,
Hi-Z: In normal condition
74 MUTE_AFS
(Not-used) I Not used Input is fixed to Hi-Z
75 SDA/EVOL_SDA I/O Data output from system μ-com to E.VOL
(System μ-com →E.VOL data output) Communication speed 200-400k
75 PBOOK_SDA I/O Data for BT telephone book memory
75 SDA/E2P_SDA I/O I2C data for ROM correction Communication speed 200-400k
76 SCL/EVOL_SCL I/O Output from system μ-com to EVOLCLK
(System μ-com →EVOLCLK output) Communication speed 200-400k
76 PBOOK_SCL I/O Clock for BT telephone book memory
76 SCL/E2P_SCL I/O I2C clock for ROM correction Communication speed 200-400k
77 PWIC_MUTE O Power IC MUTE terminal
While in STANDBY source, or momentary power down: L
While TEL MUTE: L
78 PWIC_STBY O Power IC standby terminal POWER ON: H, POWER OFF: L

9
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
79 LX_REQ_M O Communication request to slave unit
79 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
80 LX_MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF
80 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
81 LX_CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF
81 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
82 LX_RST O Hardware-reset to slave unit H: Reset, L: Normal
82 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
83 MUTE_PRE_FR O External PREOUT_MUTE F/R 0bit, “L” during momentary power down
84 MUTE_PRE_SW O External PREOUT_MUTE SUB
MUTE_2 shock noise measure
0bit, “L” during momentary power down
Use in addition to MUTE_2.
85 PON_AM I/O AM+B power supply control terminal H: ON when receiving AM, Hi-Z: OFF in other cases
86 TUN_IFC_OUT I F/E IFC OUT input terminal H: Station found, L: Station not found
87 TUN_SMETER I S meter voltage detection terminal
88 RDS_NOISE I FM noise voltage detection terminal
88 NC O Not used (Models without RDS) Output is fixed to L
89 RDS_AFS_M I/O Time constant switching when noise is
detected L: During AF search, Hi-Z: In normal condition
89 NC O Not used (Models without RDS) Output is fixed to L
90 TYPE_1 I A/D 5 patterns qRefer to “Destination table”
90 NC O Not used (Models without USB) Output is fixed to L
91 TYPE_2 I A/D 5 patterns qRefer to “Destination table”
91 NC O Not used (Models without USB) Output is fixed to L
92,93 NC O Not used Output is fixed to L
94 AVSS -
95 NC O Not used Output is fixed to L
96 VREF -
97 AVCC -
98 LX_DATA_S I Data from slave unit
98 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
99 LX_DATA_M O Data to slave unit
99 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
100 LX_CLK I/O LX BUS clock
100 NC O Not used (Models not-supporting LX-BUS) Output is fixed to L
Truth value table
qDestination setting
Model name Type1
90
Type2
91
Type1 (90) Type2 (91)
FeaturesPull up Pull down Pull up Pull down
R645 R644 R643 R642
KDC-BT838U 1 1 × 22k × 22k BT BLUE
KDC-BT8041U 1 5 × 22k 22k × BT BLUE
KDC-BT8141UY 1 4 × 22k 22k 47k BT BLUE
KDC-BT7539U 1 2 × 22k 47k 22k BT BLUE

10
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
●SUB μ-COM: 92CD28AFG6VV1 (X34-597: IC700)
Pin No. Pin Name I/O Application Processing Operation Description
1 MRST - Reset L: RESET, H: Normal
2 MSTOP I STOP signal from system μ-com (Momentary power down detec-
tion / Recovery to low power consumption mode) H: Normal, L: SOC stop
3 REQ_S I REQ signal from system μ-com L: Request
4 IPOD_RDY I RDY signal of iPOD authentication IC
5 BSIF_ST_REQ I BSIF
6 VCC - Power supply terminal (For PC port and PMC circuit)
7 XT1 - Low frequency oscillator connection terminal
Sub-clock 32.768kHz
8 XT2 - Low frequency oscillator connection terminal
Sub-clock 32.768kHz
9 PWE - External power supply control output L: STOP
10 DVSS - GND terminal
11 DVCC1B - Power supply terminal for built-in SRAM
12 RVOUT1 - Built-in regulator 1.5V output
(Flash version does not output voltage)
13 RVIN - Built-in regulator power supply input
(Flash version has power supply terminal).
14 RVIN - Built-in regulator power supply input
(Flash version has power supply terminal).
15 RVOUT2 - Built-in regulator 1.5V output
(Flash version does not output voltage)
16 DVCC1A - Power supply terminal for built-in logic
17 DVSS - GND terminal
18~22 NC O Not used Output is fixed to L
23 CD_CCE O Command I/F. CD mechanism chip enable terminal
24 CD_RST O RESET. CD mechanism RST terminal H: Normal, L: Reset
25 NC O Not used Output is fixed to L
26 DVSS - GND terminal
27 DVCC3A - Power supply terminal for peripheral I/O
28 CD_REQ I Command I/F
Communication request terminal from mechanism DSP H: Data request
29 CD_SRAMSTBY O Decoder SRAM STANDBY control L: SRAM standby (6E**)
30 CD_DRIVEMUTE O CD motor driver mute output
31 CD_PON O CD mechanism power supply control output H: Power ON (6E**), Hi-z: Power OFF
32~43 NC O Not used Output is fixed to L
44 DVSS - GND terminal
45 DVCC3A - Power supply terminal for peripheral I/O
46~61 NC O Not used Output is fixed to L
62 DVSS - GND terminal
63 DVCC3A - Power supply terminal for peripheral I/O
64 NC O Not used Output is fixed to L
65 ZDET_IN I ZDET. 0Bit Mute request terminal L: Mute request, H: In normal condition
66 CD_MUTE O Mute request to system μ-com L: Mute request, H: In normal condition
67 REQ_M O REQ signal to system μ-com L: Request

11
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application Processing Operation Description
68 IPOD_RST O RESET
69 BOOT I For writing data in Flash
69,70 NC O Not used Output is fixed to L
71 BSIF_LRCK - BSIF
72 AM1 - Operation mode: Fixed to “1”.
73 X2 - High frequency oscillator connection terminal. Main-clock 9.00MHz
74 DVSS - GND terminal
75 X1 -
High frequency oscillator connection terminal. Main-clock 9.00MHz
76 DVCC3A - Power supply terminal for peripheral I/O
77 USB_OC I USB over current detection L: Detected, H: Normal
78 USB_PON O USB PON output
79 USB_D+ - USB data connection terminal
80 USB_D- - USB data connection terminal
81 AM0 - Operation mode: Fixed to “1”
82
CD_LOE_LIM_SW I CD detection terminal (Chucking SW) L: Loading completed, H: No disc
83 DVSS - GND terminal
84 DATA_M O Serial I/F with system μ-com (Sending)
85 DATA_S I Serial I/F with system μ-com (Receiving)
86 CLK O Serial I/F with system μ-com (Clock output) f=1M or less
87 CD_SO O Command I/F. Serial I/F (Sending)
87 FLSH_UO O For writing data in Flash
88 CD_SI I Command I/F. Serial I/F (Receiving)
88 FLSH_UI I For writing data in Flash
89 CD_CLK O Command I/F. Serial I/F (Clock output) f=1MHz, L during other source
90 ROMCOR_SDA I/O E2PROM I2C data I/O terminal for ROM correction
90 IPOD_SDA I/O I2C iPOD authentication data I/O terminal
91 ROMCOR_SCLK I/O E2PROM I2C clock output terminal for ROM correction
91 IPOD_SCLK I/O I2C iPOD authentication clock output terminal f=80kHz
92 BSIF_BCK - BSIF L during other source
93 BSIF_DATA - BSIF L during other source
94 BSIF_GATE O BSIF
95 DVCC3A - Power supply terminal for peripheral I/O
96 NC I Not used
96 ROMCOR_DET I ROMCOR writing detection H: Writing
97~99 NC I Not used
100 DVSS - GND terminal

12
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
●PANEL μ-COM: 30624MWPB81GP/30626MJPA23GP (X16-638: IC1)
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
1 REMO I Remote control signal input Pulse width detection
2 NC - Not used Output L fixed
3 FL SI1 O FL display serial data output Pulse output
4 NC - Not used Output L fixed
5 FL CLK O FL display serial clock output H: Except when data is written
(Including STANDBY)
6 BYTE - GND
7 CNVSS -
8,9 NC - Not used Output L fixed
10 RESET - Reset Being controlled by system μ-COM
H: Normal, L: Reset
11 XOUT - Resonator 12MHz
12 VSS - GND
13 XIN - Resonator 12MHz
14 VCC1 - Power supply (5V) Connects PAN5V
15 NMI I Not used Input fixed
16~19 NC - Not used Output L fixed
20
LED CONT RTY2 O LED rotary (Multi-key side) PWM output H: LED ON, L: LED OFF
20
LED CONT
BLUE
O Vari blue PWM output H: LED ON, L: LED OFF
21 NC - Not used Output L fixed
22 FL BK O FL display blanking control H: FL display OFF, L: FL display ON
23 FL LAT O FL display latch control H: Data through, L: Data latch
24
LED CONT UNDER O LED side luminescence (Under FL display) PWM output H: LED ON, L: LED OFF
24
LED CONT RED O Vari RED PWM output H: LED ON, L: LED OFF
25 NC - Not used Output L fixed
26
LED CONT RTY1 O LED rotary (VOL side) PWM output H: LED ON, L: LED OFF
26
LED CONT GREEN O Vari GREEN PWM output H: LED ON, L: LED OFF
27,28 NC - Not used Output L fixed
29 PAN DATA O Data transmission from panel
30 SYS DATA I Data reception from system μ-COM
31 SYS REQ I System μ-COM communication request input H: Data communicated
32 PAN REQ O Panel communication request output H: Data communicatied
33 FL SI2 O FL display serial data output Pulse output
34 NC - Not used Output L fixed
35 CLK IN I/O FL display serial clock input Inputs FL display clock
36~38 NC - Not used Output L fixed
39 ROMCOR DET I ROM correction writing mode H: Authorization to rewrite in ROM correction
(I2C opened)
39 EPM I For rewriting in flash ROM (EPM) Input fixed
40~43 NC - Not used Output L fixed
44 FLASH CE I For rewriting in flash ROM (CE)
45,46 NC - Not used Output L fixed
47
LED CONT FLTOP I/O LED side luminescence (Above FL display) SW H: LED ON, Hi-Z: LED OFF
MICROCOMPUTER’S TERMINAL DESCRIPTION

13
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
Pin No. Pin Name I/O Application Truth
value table Processing Operation Description
48 LED CONT TRI I/O Triangle LED luminescence SW H: LED ON, Hi-Z: LED OFF
49,50 NC - Not used Output L fixed
51 SDA I/O Data transmission and reception for ROM correction Output except when data is read
52 SCL I/O Clock for ROM correction Output except when clock data is read
53~55 NC - Not used Output L fixed
56 ROTALY2 CW I Rotary (Multi key) B input Pulse width detection
1-pulse/2-click, 15-pulse/360°
57 ROTALY2 CCW I Rotary (Multi key) A input Pulse width detection
1-pulse/2-click, 15-pulse/360°
58 ROTALY1 CW I Rotary (VOL) B input Pulse width detection
1-pulse/2-click, 15-pulse/360°
59 ROTALY1 CCW I Rotary (VOL) A input Pulse width detection
1-pulse/2-click, 15-pulse/360°
60 VCC2 - Power supply (5V) Connects PAN5V
61 NC - Not used Output L fixed
62 VSS - GND
63~70 NC - Not used Output L fixed
71 SC CON I System μ-COM communication
Panel operation control
H: Panel operated,
L: Panel operation stopped
72 NC - Not used Output L fixed
73 KR2 I Key return input q
74 KR1 I Key return input q
75 NC - Not used Output L fixed
76 KS1 I/O Key scan output qSwitches between output-L and Hi-Z
77 KS2 I/O Key scan output qSwitches between output-L and Hi-Z
78 KS3 I/O Key scan output qSwitches between output-L and Hi-Z
79 KS4 I/O Key scan output qSwitches between output-L and Hi-Z
80 KS5 I/O Key scan output qSwitches between output-L and Hi-Z
81~90 NC - Not used Output L fixed
91 SA RST O Reset output for spectrum analyzer H: Reset released, L: Reset
92 SA CLK O Clock output for spectrum analyzer
93 SA IN I Data input for spectrum analyzer
94 AVSS - GND
95 NC - Not used Output L fixed
96 VREF - A/D analog reference voltage Connects PAN5V
97 AVCC - Power supply (5V) Connects PAN5V
98~100 NC - Not used Output L fixed
Truth value table
qKEY MATRIX
KR1 (Pin 74) KR2 (Pin 73)
KS1 (Pin 76) TI AM
KS2 (Pin 77) MENU <<
KS3 (Pin 78) AUDIO PLAY
KS4 (Pin 79) ATT >>
KS5 (Pin 80) N/A FM
MICROCOMPUTER’S TERMINAL DESCRIPTION

14
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
● How to enter the test mode
Press and hold the [FNC] and [EJECT] keys and reset.
(While “----” is being displayed, power can be ON for 30
minutes.)
●How to clear the test mode
Reset, momentary power down, ACC OFF, Power OFF,
detach the panel.
●Test mode default condition
• Source is STANDBY.
• Display lights are all turned on.
• The volume is at 30 (-10dB).
• LOUD is OFF.
• CRSC is off regardless of the availability of switching
function.
• SYSTEM Q is NATURAL (=FLAT).
• BEEP should always function when the key is pressed
briefly.
• AUX is ON
• DISPLAY TYPE is TYPE A, SIDE is Display Tag.
• TUNER source display shall be as shown below:
<For European models> Upper row = PS/Frequency,
Middle row = Spectrum analyzer/Clock, Lower row =
Date
<For models of destination “K” and “M”> Upper row =
SNPS, Middle row = Spectrum analyzer/Clock, Lower
row = Date
• CD/USB source display shall be as shown below:
Upper row = P-TIME, Middle row = Spectrum analyzer/
Clock, Lower row = Date
• SOURCE SELECT shall be “2”.
●Specification of the test mode for tuner source
The frequency of 98.3MHz is received when the [4] key is
pressed in the TUNER FM mode.
(
∗1) Only in the test mode, [1] key, [2] key, [3] key, [4] key,
[5] key and [6] key shall be displayed on the multi-
function key.
1. Press the [FNC] key briefly to make the multi-
function display.
2. Rotate the control knob on the right side and use
the [ ] / [ ] keys to display the target key in the
center.
3. Press the [ ] key briefly to finalize the display.
(
∗2) Perform the same operations as above on the keys,
[1], [2], [3], [4], [5], and [6] of the remote controller.
●TUNER Setup adjustment mode specification
1. Use [FM] / [AM] key to select TUNER band.
2. Press and hold [ ] key for 2 seconds to enter TUNER
adjustment mode. At the same time, set FM receive fre-
quency to 98.3MHz.
3. Use [FM] / [AM] key to change between the adjustment
items.
FM Key FM Key
AM Key
AM Key
AM Key
FM Key
Seek Stop Level adjustment
(manual)
Soft Mute adjustment
Seek Stop Level adjustment
(auto)
(Note) The first item shall be Soft Mute adjustment.
But, in the case of AM band, the first item shall be
Seek Stop Level adjustment (auto) because there
is no Soft Mute adjustment for AM band.
4. Proceed with the following steps for every adjustment
item:
Soft Mute Adjustment
∗This item exists only in TUNER FM. Make adjustment
under the condition when VOLUME=30 and LOUD is
OFF.
(Display) SMD–x___ : Adjustment values, 0~F, are
shown in “x”.
a. Use [ ] / [ ] key (which can be pressed and con-
tinuously held) to set the value between 0 (18dBμ) and
F (36dBμ).
b. After the completion of the adjustment, press and hold
[] key for 2 seconds to start writing the adjustment
values in E2PROM. At the successful completion of
the writing, “EP_WRITE” is displayed
Seek Stop Level Adjustment (Auto)
(Display) ATN_4.32V : When at Normal (Local OFF)
(Display) ATL_3.45V : When at Local (Local ON)
Current receive level
←
a. In the band in which Local Seek ON/OFF is selectable,
Press [AUTO] / [TI] key briefly to change between Lo-
cal Seek ON and OFF.
TEST MODE

15
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
b. Press and hold [ ] key for 2 seconds to make the cur-
rent receive level to be the seek stop level in order to
start writing the adjustment values in E2PROM. At the
successful completion of the writing, “EP_WRITE” is
displayed. (In this step, use Local Seek ON/OFF setup
to change the destination of the writing.)
Seek Stop Level Adjustment (Manual)
(Display) MNN_3.98V : When at Normal (Local OFF)
(Display) MNL_4.44V : When at Local (Local ON)
Adjustment values
Contents written in E2PROM as
the initial values are displayed.
←
a. In the band in which Local Seek ON/OFF is selectable,
Press [AUTO] / [TI] key briefly to change between Lo-
cal Seek ON and OFF.
b. Use [ ] / [ ] key (which can be pressed and con-
tinuously held) to manually adjust the seek stop level
between 0.00 and 4.49V (K/M), and between 0.00 and
4.70V (E), depending on the destination.
∗The key keeps functioning downwards after the level
becomes 0.00V but in the meantime the level will be-
come 0.00V as it is displayed.
c. Press and hold [ ] key for 2 seconds to make the volt-
age that is adjusted in the above step to be the seek
stop level and to start writing the voltage in E2PROM.
At the successful completion of the writing, “EP_
WRITE” is displayed. (In this step, use Local Seek ON/
OFF setup to change the destination of the writing.)
5. Press [ ] key briefly to exit from TUNER Adjustment
mode (and to keep running the Test mode).
●
RDS automatic measurement (European model)
Add the process to replace the visual inspection of PS
display previously done in the production line.
When it is confirmed that the PS data has been received
and that the content of the PS is “RDS_TEST”, force to
OFF the P-CON terminal. ( The symbol, “_” indicates the
blank. )
→ Make this as the process dedicated for the test mode.
P-CON is recovered by Power OFF→ON.
●Special display in tuner sourse
Error is found in front-end, etc. if indications below are
displayed while in tuner sourse.
• “TNE2P_NG”……E2PROM (inside front–end) values are
still default (not determined)
• “TNCON_NG”……Cannot communicate with the front-
end.
●K3I forced switching
Every time when [6] key is pressed in tuner FM band,
switched in the following order: AUTO→Forced WIDE
→Forced MIDDLE→Forced NARROW→AUTO. Default
status is AUTO, and displayed as shown below.
• AUTO …
aF1 98.1
• Forced WIDE …
wF1 98.1
• Forced MIDDLE … mF1 98.1
• Forced NARROW … nF1 98.1
●CD source test mode specification
• Jumps to the following tracks by pressing the [ ] key.
9
→15→10→11→12→13→22→14→9 (recursive)
Note that when playing a CD-DA disc and MP3 / WMA
/ AAC / WAV discs with 8 files or less, the disc is played
from the 1 track in the normal order.
• Pressing the [ ] key goes back by 1 track from the track
being played.
• While in CD source, press the [1] key ([1] and [FM] keys
are for CD-DA) briefly to jump to No.28.
• While in CD source, press the [2] key briefly to jump to
No.14.
• While in CD source, press the [3] key briefly to display
CD mechanism model name and the version.
Press the [3] key briefly again to return to the normal dis-
play. (Time code display)
6E20 V0123
SERV V1.23
BOOT V1.23
• While in CD source, press the [6] key ([6] and [AM] keys
are for CD-DA) briefly to jump to No.15. At this time, the
volume value is set to 27 (2V PRE).
(
∗1) Only in the test mode, [1] key, [2] key, [3] key and [6]
key shall be displayed on the multi-function key.
1. Press the [FNC] key briefly to make the multi-
function display.
2. Rotate the control knob on the right side and use
the [ ] / [ ] keys to display the target key in the
center.
3. Press the [ ] key briefly to finalize the display.
(
∗2) Perform the same operations as above on the keys,
[1], [2], [3], and [6] on the remote controller.
●AUDIO adjust mode
• Press the [AUD] key briefly to enter the audio adjustment
mode.
TEST MODE

16
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
• Press the remote control [∗] key and [AUD] key to enter
the audio adjustment mode.
• Both AUDIO FUNCTION MODE and SETUP MODE ad-
justment items are included.
• By pressing [AUD] and [FM] key briefly, switch the item to
be adjusted in the following order. (Only in forward rota-
tion)
The default item shall be Fader, and then the item
is forwarded in the following order: Balance→Bass
Level→Middle Level→Treble Level→HPF Front→HPF
Rear→LPF Sub Woofer (thereafter arbitrary).
• Continuous forwarding by remote control is prohibited.
• Fader is adjusted by the VOL knob and [ ] / [ ] keys
in 3 steps: R15↔0↔F15. (Default value: 0)
• Balance is adjusted by the VOL knob and [ ] / [ ]
keys in 3 steps: L15↔0↔R15. (Default value: 0)
• Bass/Middle/Treble Level are adjusted by the VOL knob
and [ ] / [ ] keys in 3 steps: -8↔0↔8. (Default value:
0)
• HPF Front / Rear is adjusted by the VOL knob and [ ] /
[] keys in 2 steps: Through↔180Hz (or 220Hz). (Default
value: Through)
• LPF Sub Woofer is adjusted by the VOL knob and [ ]
/ [ ] keys in 2 steps: 60Hz (or 50Hz) ↔Through. (Default
value: Through)
• Sub Woofer Phase is adjusted by the VOL knob and [ ]
/ [ ] keys in 2 steps: Reverse↔Normal. (Default value:
Normal)
• Volume Offset (other than the internal AUX) is adjusted
by the VOL knob and [ ] / [ ] keys in 2 steps: -8↔0.
(Default value: 0)
• Volume Offset (the internal AUX) is adjusted by the VOL
knob and [ ] / [ ] keys in 3 steps: -8↔0↔+8. (Default
value: 0)
• Loudness ON/OFF is adjusted by the VOL knob and [ ]
/ [ ] keys in 2 steps: OFF↔ON. (Default value: OFF)
• Dual Zone ON / OFF is adjusted by the VOL knob and
[] / [ ] keys in 2 steps: OFF↔ON. (Default value:
OFF)
• Bass f / Bass Q / Bass EXT / Middle f / Middle Q / Treble
f are not displayed in the audio adjustment menu.
• SYSTEM Q curve selection is not displayed in the audio
adjustment menu.
●MENU
• Press the [FNC] key briefly to make the multi-function
display and press the [ ] key briefly to enter the MENU.
• Press the remote control [DNPP/SBF] key and the
[DIRECT] key to enter the MENU.
• Continuous forwarding by remote control is prohibited.
• Only in the Test mode, add [PH-SEL] (Phone Selection)
in the multi-function display of the STANDBY source and
this shall be included in the initial item (and shall be lo-
cated at the top of the item).
• The initial item in TUNER source MENU source during
the Test mode shall be selectable between Seek ON and
OFF. (European model)
• Only in the Test mode, it shall be made possible to show
“ROM Write Mode” and “ROM Read Mode” items in the
STANDBY source MENU to allow the ROM data transfer
process.
●Bluetooth
• Connect the unit with the Test mode counterpart unit and
follow the below procedure to do the Audio Loop Back
test.
• While in the source is STANDBY, press and hold the [ATT]
key for 1 second to initialize the BT memory information
to the factory setup.
During the initialization, the message “Initialize....” blinks
(at the period of 1Hz) and at the completion of the initial-
ization the message, “BT_MEM_INIT_OK” is displayed.
(In the case of unsuccessful initialization, the message,
“BT_MEM_INIT_NG” is displayed.)
• Factory setup
Pairing information (Flash Memory) cleared
Telephone number preset (E2PROM) cleared
Friendly name “KENWOOD BT CD/R-2P2” written
PIN code “0000” written
• Audio Loop Back
Audio Loop Back test can be carried out with BT Audio
source in the Test mode.
(Note: After the Audio Loop Back test, “CK5050” is add-
ed to the list of registered units. After the completion of
the test, without fail reset to the factory setup using the
above procedure.)
1. Add [PH-SEL] (Phone Selection) in the multi-function of
the STANDBY source in the test mode, and the [PH-SEL]
shall be included in the initial item.
2. While in the source is STANDBY, press the [FNC] key
briefly to show the multi-function display and press the
[] key briefly to enter the Phone Selection mode (Coun-
terpart unit selection mode).
TEST MODE

17
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
3. In the Phone Selection mode in the Test mode, 5 coun-
terpart units are listed. Rotate the control knob on the
right or use the [FM] / [AM] key to select the desired
counterpart unit, and then press the [ ] / [ ] key brief-
ly to connect with the counterpart unit.
4. The symbol, ∗lights up at the left side of the selected
counterpart unit name and the Audio Loop Back test
mode turns ON after the completion of the connection.
5. Turn [SRC] key briefly twice to switch the source to the
BT Audio.
6. When the source is BT Audio, voice from the Mic can
be heard from the Speaker as shown in the below il-
lustration, where the voice passes through the paths, q
through r.
Speaker MIC
;:
.
@
Test mode (dedicated)
Counterpart unit
This unit
●ROM data transfer
This function is used to transfer E2PROM data (installer
memory) inside of the front-end to mother E2PROM of
the backup, and to transfer the data back from the moth-
er E2PROM to the E2PROM of the front-end.
1. While in the source is STANDBY, press the [FNC] key
briefly to show the multi-function display and press the
[] key briefly to enter the Menu.
2. Rotate the control knob on the right or use the [ ] / [ ]
keys to select ROM Read Mode or ROM Write Mode in
the MENU items and press and hold the [ ] key for 1
second to turn on the Mode.
Operation Display Description
Start resetting by
pressing “[FNC]
key + [EJECT]
key”
All lights ON Test mode ON
Press [FNC] key
to select [Menu]
mode.
“ROM_Read_Mode”
Front-end→Mother
Process to transfer data
“ROM_Write_Mode”
Mother→Front-end
Process to transfer data
Operation Display Description
(In the above
ROM Read Mode)
Press and hold
[] key (for one
second) to select
Yes.
“ROM_Reading…” Front-end→Mother
ROM data transfer in progress
“ROM_Read_OK” Front-end→Mother
ROM data transfer OK
“ROM_Read_NG” Front-end→Mother
ROM data transfer NG
(In the above
ROM Write Mode)
Press and hold
[ ] key (for one
second) to select
Yes.
“ROM_Writing…” Mother→Front-end
ROM data transfer in progress
“ROM_Write_OK” Mother→Front-end
ROM data transfer OK
“ROM_Write_NG” Mother→Front-end
ROM data transfer NG
●Dual Zone
• If the [AUTO] or [TI] keys is pressed briefly while in a
source other than STANDBY, 2ZONE is switched be-
tween ON / OFF.
●Backup current measurement
If reset while in Acc OFF (Back Up ON) condition, MUTE
terminal goes off 2 seconds later, rather than 15 seconds.
(During this time, the CD mechanism does not function.)
●OPEL communication
(OPEL / OEM display supporting model)
OPEL communication line while in the test mode outputs
the following. (Communication line output condition is
switched every 500msec.)
CE
DATA
CLK
500msec 500msec 500msec
●Special displays while all lights are on
When all lights are on with STANDBY source, if the fol-
lowing keys are pressed, the following messages are dis-
played.
[FM]
key
Key pressed briefly: ROM correction version is displayed
(Display) SYS_ROM_R1234
(Display) PAN_ROM_R1234
(Display) BOL_ROM_R1234
When E2PROM is not installed: ROM_ERR__
When not written in: ROM_R - - - -
When data not matching: ROM_R∗∗∗∗
∗1
“BOL ROM” can be shown only in the model with USB.
TEST MODE

18
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
[ ]
key
Key pressed briefly: AUDIO data initialization
(Display) AUD_INIT
[]
key
Key pressed briefly: Forced Power OFF data displayed.
Press and hold: To clear the forced power OFF infor-
mation. (Press and hold for 2 seconds while the forced
power OFF data is displayed.)
(Display) POFF_ - - - (No Forced Power OFF)
SEC (Forced Power OFF because of
missing Security Code)
PNL (Forced Power OFF because of
system μ-com and panel commu-
nication error)
[AUD]
key
Key pressed briefly: iPod authentication IC installation
status display
(Display) iPod_ OK_ (Installation status OK)
NG (Installation status NG)
[FNC]
key
Key pressed briefly: Multi-function display
Press and hold: Version & Service information display
mode ON
Refer to the Table 1.
[1]~[6]
Key
(Remote
controller)
Key pressed briefly: Version & Service information display
mode ON
Refer to the Table 1.
[]
key
Key pressed briefly: CD information display mode ON
Refer to the Table 2.
Table 1 - Version & Service information display mode
[AM]
key
↑
↓
[FM]
key
[1]
key
(Remote
controller)
Key pressed briefly: Version is displayed (Switching)
(Display) C0715WK__SYS1.23
(Display) STYPE: ××_PAN1.11
(Display) PTYPE: ×__
∗1 STYPE indicates system μ-com destination, and
PTYPE indicates panel μ-com destination, and
show real-time condition of the destination termi-
nal
↓↑ Use the remote controller [1] key or the [ ] /
[ ] keys to switch.
(Display) BT_VER : HW×××_SW×××
(BT module H/W & S/W Version)
(Display) ADDR : ××××××××××××
(BT module Address)
(Display) PIN : ××××××××
(BT module PIN Code)
[2]
key
(Remote
controller)
Key pressed briefly: Serial No. is displayed (8 digits)
(Display) SNo_××××××××
[3]
key
(Remote
controller)
Key pressed briefly: Power ON time is displayed.
(Display) PonTim_0H××_
(00~50 is displayed for “xx”.
When less than 1 hour,
display by increment of 10
minutes.)
××××× (00001-10922 is displayed
for “xxxxxx”.)
MAX 10922 (hours)
[AM]
key
↑
↓
[FM]
key
[4]
key
(Remote
controller)
Key pressed briefly: CD operation time is displayed.
(Display) CDTim_0H××_ (00~50 is displayed for “xx”.
When less than 1 hour,
display by increment of 10
minutes.)
××××× (00001-10922 is displayed
for “xxxxxx”.)
MAX 10922 (hours)
[5]
key
(Remote
controller)
Key pressed briefly: Number of CD EJECT times is
displayed.
(Display) EjeCnt_××××× MAX 65535 (times)
[] key Key pressed briefly: Invalid
Press and hold: To clear the service information that
is being displayed. (Press and hold for 2 seconds
while each service information is displayed.)
[FNC] key Key pressed briefly: Version & Service information
display mode OFF
Table 2 - CD information display mode
[AM]
key
↑
↓
[FM]
key
I2C communication condition and CD mechanism error log
display
(Display) I2C_{{____________
(Display) ERR_1-UU, 2-U, 3-UU
∗
“OK” or “NG” is displayed for “{{”. / “—“ or the error
code is displayed for “U/U”.
CD loading error log display
(Display) Load_Error____
(Display) __(1) xx__ (2) xx
(Number of times is displayed for “xx”.) MAX 99 (times)
CD ejection error log display
(Display) Eject_Error___
(Display) __(1) xx__ (2) xx
(Display) __(3) xx__ (4) xx
(Number of times is displayed for “xx”.) MAX 99 (times)
CD time code error count data display (missing counts)
(Display) Count_Lose
(Display) __CDDA_: xx
(Display) __CDROM: xx
(Number of times is displayed for “xx”.) MAX 99 (times)
CD time code error count data display (count not updated)
(Display) Count_Stay
(Display) __CDDA_: xx
(Display) __CDROM: xx
(Number of times is displayed for “xx”.) MAX 99 (times)
[ ]
key
Key pressed briefly: CD information display mode OFF
Press and hold: To clear entire CD information (Press and
hold for 2 seconds)
●Initializing AUDIO-related setting value
Press the [ ] key briefly in the STANDBY source to reset
the AUDIO setting value to the test mode default value.
TEST MODE

19
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
●Other
• When Power ON, do not display “CODE_NG”, “CODE_
OFF”, and “CODE_ON”.
• When the source is STANDBY, press and hold the [AUTO]
or [TI] keys for 1 second to switch the PREOUT between
Rear and Sub Woofer (Rear↔Sub Woofer). (2PREOUT
models)
• When started in the test mode, duration of prohibiting
LINE MUTE shall be changed from 10 seconds to 1 sec-
ond.
• When in the test mode, when DC offset error detection
is run, the detection information is not written into the
E2PROM.
• DEMO mode shall not be operated while in the Test
Mode, Backup/Installer Memory & CD Mechanism In-
formation & Service Information & DC Error Detection
Information & BT Memory Information Clear Mode, or DC
Error Detection Information Clear Mode.
Also, do not display DEMO ON/OFF option items in the
MENU in STANDBY source in the above modes.
●Panel combination check
In order to avoid improper combination of the unit and
panel, the following messages are shown in the STAND-
BY source during the Test mode. The message is de-
cided based on the combination of System μ-com and
panel.
<Mother for K destination + Panel for K destination >
<Mother for E destination + Panel for E destination>
<Mother for M destination + Panel for M destination>
OK!
< Mother for K destination + Panel for E destination>
NG
_Mother:K_with_BT
_Panel_:E_with_BT
NG!
<Mother for K destination + Panel for M destination>
NG
_Mother:K_with_BT
_Panel_:M_with_BT
NG!
<Mother for E destination + Panel for K destination>
NG
_Mother:E_with_BT
_Panel_:K_with_BT
NG!
<Mother for E destination + Panel for M destination>
NG
_Mother:E_with_BT
_Panel_:M_with_BT
NG!
<Mother for M destination + Panel for K destination>
NG
_Mother:M_with_BT
_Panel_:K_with_BT
NG!
<Mother for M destination + Panel for E destination>
NG
_Mother:M_with_BT
_Panel_:E_with_BT
NG!
[Note]
1. The above indication of the “NG” message is based
on the decision made by the panel μ-com. In the panel
μ-com of the model that is already T/O and does not
have the integrated BT, the combination with the mother
of the model that has the integrated BT is not consid-
ered. Thus the indication of OK or NG is not correct for
the combination of <Mother of the model with the inte-
grated BT and Panel of the model without the integrated
BT>.
2. In the combination of the above 1 and any case of the
above NG, the power is forcedly turned off if the unit is
normally started up (not in the Test mode startup).
●Clearing the Backup/Installer memory & CD
mechanism information & service information
& DC error detection information & BT memory
information (Clearing E2PROM data within the
front end)
1. While pressing and holding the [SRC] and [AUD] keys,
reset-start to start initializing the backup/installer memory
data, CD mechanism information, service information,
DC offset error detection information and BT memory in-
formation.
(While “----” is being displayed, power can be ON for 30
minutes.)
[CD mechanism information]
• Displays I2C communication condition
• Displays CD mechanism error log
• Displays CD loading error data.
• Displays CD ejection error data.
• Displays CD time code error count data (missing
count).
• Displays CD time code error count data (count not up-
dated).
TEST MODE

20
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
[Service Information]
• Displays power ON time is displayed.
• Displays CD operation time.
• Displays number of CD EJECT times.
• Displays forced Power OFF data.
[DC offset error detection information]
• DC offset error detection display 1
• DC offset error detection display 2
[BT memory information]
• Pairing information
• Preset telephone number information
• Friendly name (Setup)
• PIN code
2. After the initialization process is completed, the following
is displayed.
When successfully completed
E2P_CLR:{
BT_CLR :{
When finished but unsuccessful 1: Initialization of BT
memory information is NG
E2P_CLR:{
BT_CLR :°
When finished but unsuccessful 2: Initialization of
E2PROM in TUNER PACK is NG
E2P_CLR:°
BT_CLR :{
When finished but unsuccessful 3: Initialization NG
E2P_CLR:°
BT_CLR :°
(Note)
It takes about 10 seconds to initialize BT memory infor-
mation and during this initialization process the following
“–” is shown that indicates the “Not-yet-decided” status.
E2P_CLR:{
BT_CLR :—
3. In this mode, even if the specified time has passed, the
backup memory items are not written into E2PROM.
4. This mode is cancelled by resetting. (The last screen will
not be retained.)
(Note) In this mode, the DC error detection display, “Pro-
tect” is not shown.
Do not touch any key in this mode (while in clearing).
Never turn ON or OFF in this mode.
●Clearing DC offset error detection information
(Clearing E2PROM data within the front end)
1. Press and hold [ATT] and [AUD] keys and reset-start to
go into the DC offset error display mode.
(While “----” is being displayed, power can be ON for 30
minutes.)
2. While in STANDBY source, the current DC offset error
detection condition is displayed.
Upper
row
DC offset error detection display 1 (To show such detec-
tion as the improper connection, and other detection)
(Display) DC1_OK__ (not detected)
ERR (Improper connection or other error
is detected.)
Middle
row
DC offset error detection display 2 (To show the number
of capacitor leaks.)
(Display) DC2_0___ (not detected)
1 (Leak is detected once.)
2 (Leak is detected twice.)
3 (Leak is detected 3 times.)
4 (Leak is detected 4 times or more.)
3. While the DC offset error detection condition is being
displayed as above, press and hold [1] key for 2 seconds
to clear the information about the improper connection,
and other detection. Press and hold [2] key for 2 seconds
to clear the information about the number of capacitor
leaks. (Clear E2PROM)
4. DC offset error display mode is cancelled by resetting.
(The last screen will not be retained.)
(Note) In this mode, the DC offset error detection display,
“Protect” is not shown.
●FM/AM channel space switching (Models for
destination “K” and “M”)
FM: 50kHz↔200kHz, AM: 9kHz↔10kHz
• While power is OFF, press and hold [FNC] and [AUTO]/[TI]
keys, and press [SRC] key to power ON.
●Security
How to enter the forced POWER ON mode
While “_ _ _ _” is being displayed, while simultaneously
pressing [FNC] key and [ ] key, press [RESET] button,
With this, it is possible to turn the power on for 30 min-
utes only.
• How to register the security code on the “Car
Audio Passport” sheet after replacing E2PROM
(inside the front-end) (code security models)
1. Enter the test mode. (Refer to “How to enter the test
mode”.)
TEST MODE