Kenwood KDC-BT645U User manual

© 2010-1 PRINTED IN JAPAN
B53-0781-00 (N)341
CD RECEIVER
KDC-BT40U/BT645U
KDC-U546BT
SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
* Depends on the model. Refer to the parts list.
Panel assy
KDC-BT40U (A64-5015-02)
Panel assy
KDC-BT645U (A64-5013-02)
TDF SPARE-PANEL
MAIN UNIT NAME TDF PARTS No. TDF NAME
KDC-BT40U Y33-3272-72 TDF-BT40U
KDC-BT645U Y33-3270-10 TDF-BT06D
KDC-U546BT Y33-3270-21 TDF-U546BT
Panel assy
KDC-U546BT (A64-5017-02)
Mounting hardware assy
(J22-0789-03)
* Remote controller assy (RC-405)
(A70-2104-05)
Escutcheon
(B07-3271-01)
Lever
(D10-7106-04) x2
* Screw set
(N99-1757-15)
* DC cord
(E30-6933-05)
* Carrying case
(W01-1710-05)
* Screw (4x16)
(N84-4016-48)
Bluetooth
KDC-BT40U KDC-BT645U
Bluetooth
KDC-U546BT
Bluetooth
* Plastic cabinet assy
(A02-2755-23)
* DC cord
(E30-6934-05)

2
KDC-BT40U/BT645U
KDC-U546BT
BLOCK DIAGRAM
2
1
BU DET
PHONE
ACC DET
RESET
9
5
BU DET
1
1
MUTE
R15
12
2
2
3
1
1
1
111
R118
1
PS1-1 / PS1-2
ACC-DET / BU-DET
PS1-3 / PS2-1
PHONE
REAR
FRONT
PS1-1 / PS1-2
PS1-3 / PS2-1 P-ANT
P-CON
SP-OUT
PHONE
ACC
BU
FRONT L/R
REAR L/R
P-STBY
2
13
2
2
8
PANEL5V
to GND
9
5
R31,32
FL+B
PAN SW5
PAN SW5
1
2
REAR/SW
E-VOL
IC2
A8V
SYSTEM u-COM
Q707
PHONE
ACC DET
Q101
Q103
BU DET
Q102
SW14V
Q11,12
Q2,3
A8V
SERVO+B
BU5V
SW5
PANEL5V
RESET IC
IC8
ILLUMI+B
CONNECTOR
RESET
IC1
IC6
J1
ILLUMI+B
Q701-706
MUTE
Q104,105
IC501
Q301
BU5
∗J4
SW5V
S3
A8V
ANT.
∗IC7
SW5
BU5
BU5
SW5
IC4
FL+B
J3
SW5
RDS
DECODER
TUNER
Rx1
1/2W CD
SERVO
IC
SUPPLY
POWER
DC-CN etc
MUTE
PRE
IC
POWER
PRE-OUT
DET
SURGE
DC-CN
BU
USB5V
BU5
DC/DC5V
IC51
CD
MECHA
DME1
SW
HI-SIDE
USB5V
∗IC52
A900
BU
BU5
(ATOMIC) LX-BUS
PANEL DET
ENCODER
ROTARY
REMOTE
IC2
FRONT
J2
AUX
S1
FL
USB CN
ED1
J3
ILLUMI
KEY
MATRIX
KEY
1/2W
Rx2
J4
OEM REMOTE
SW5
FL+B
SHIFT
LEVEL
IC900
LPF
Q902
BU5
SERVO+B
BT3.3V
IC901
BT3.3V
A8V
BT MIC CN
CN1
BLUETOOTH
MODULE
ELECTRIC UNIT (X34- )
SWITCH UNIT (X16- )
BU1.5V
BU3.3V
SW3.3V
DPU1
CD PLAYER UNIT (X32-6260-01) BOARD MOTHER
(X34- )
EF
A
C
B
TR COIL
FO COIL
APC
IC2
16.934MHz
CLOCK
IC3
LOADING &
MOTOR
DRIVER
MOTOR
SPINDLE
S2
S1
S3
SLED
MOTOR
DM1
DM2
X3
Q7
RF AMP
SERVO
MP3 DECODER
WMA DECODER
1Mbit SRAM
PROCESSOR
AAC DECODER
+
+
+
+
+
LEVEL
SHIFT
IC5
iPod
IC7
REG
BU3.3 /
AUTHENTICATION
LEVEL
IC6
SHIFT
IC1
u-COM
Q5
SW BU1.5V
IC9
SW3.3V
REG
Q3
SW
CLOCK
9.000MHz
X1
32.768kHz
CLOCK
X2
IC4
INV
Q9
MECHANISM
VREF
12EJE SW
LOS SW
LOE SW
MOTOR
LO/EJ
AGND
TRO
FOO
DMO
FMO
LD
SIGNAL A/B/C/E/F
S.GND
S7.5V
FOO
TRO
DMO
FMO CD DRIVE MUTE
SO
SRAMSTB
SI
BUCK
CCE
CD REQ
MSTOP
BUCK
CCE
REQ
SO
SI
RST
MRST
Lch
Rch
Z DET
MUTE L/R
DGND
DVSS BU1.5V SW1.5V D3.3V
BU5V
PD
VBUS SW
USB+
VBUS OC
USB-
DATA SCD SI
REQ A
MRST
MSTOP
CLK
CD MUTE
REQ M
DATA M
USB D+
USB D-
USB VBUS SW
USB OC
CD LOE LIM SW RVIN1/RVIN2 DVCC3B PON DVSS DVCC3A PWE
CD SO
DSP REQ
CD CLK
CD RST
ZDET IN
CD SRAMSTB
CE
BSIF LRCK
BSIF DATA
BSIF BCK
BSIF GATE
BSIF ST REQ
IPOD SDA
IPOD SCL
AVSS A3.3V LO RO
BSIF ST REQ
BSIF GATE
BSIF DATA
BSIF BCK
BSIF LRCK
G
D
S

3
KDC-BT40U/BT645U
KDC-U546BT
COMPONENTS DESCRIPTION
●SWITCH UNIT (X16-678x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC2 Remote Control Sensor
Q20 Key Scan Timing Adjust When the base is Hi, key scan starts.
Q21 Grid Reversing Driver When the base is Hi, GRID1 is ON.
Q22 Grid Reversing Driver When the base is Hi, GRID2 is ON.
Q23 Grid Reversing Driver When the base is Hi, GRID3 is ON
●ELECTRIC UNIT (X34-662x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 System μ-COM Controls FM/AM tuner, CD mechanism, Panel, volume and tone.
IC2 E-VOL Controls the source, volume and tone.
IC4 Power Supply IC Outputs 5Vx2, 8.3V, 10.2V, P-CON and P-ANT.
IC6 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC7 RDS IC RDS decoder.
IC8 Reset IC Lo when detection voltage goes below 3.6V.
IC51 SW REG Power supply for D+5.1V. (to USB and panel)
IC52 Hi-side SW Detection of USB over-current.
IC501 Tuner IC (ATomIC) Tuner IC.
IC900 LPF Bluetooth outputs low pass filter.
IC901 D+3.3V AVR IC Power supply for BT+3.3V.
Q2,3 Servo+B AVR When Q3'base goes Hi, AVR outputs 7.5V.
Q11,12 Control SW for Servo+B ON when the base goes Hi.
Q13 Control SW for IC4 ON when the base goes Hi.
Q14 Control SW for IC4 ON when the base goes Lo.
Q53 FREQ CONT SW for IC51 When the base goes Lo, switching frequency becomes 1.3MHz.
When the base goes Hi, switching frequency becomes 1.8MHz.
Q101 ACC DET ON when the base goes Hi during ACC is applied.
Q102 Surge DET When the base goes Hi, surge voltage is detected.
Q103 BU DET ON when the base goes Hi during BU is applied.
Q104,105 Mute Control ON when the base goes Hi.
Q301 Panel 5V SW ON when the base goes Lo.
Q707~706 Pre-out Mute SW When a base goes Hi, Pre-out is muted.
Q707 Mute Driver for Pre-out ON when the base goes Lo.
Q901 BT Module Reset Control When the base goes Hi, BT module is reset.
Q902 Level Shift (5V→3.3V) Dual FET.
●CD PLAYER UNIT (X32-6260-01)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Mechanism μ-COM Controls DSP and peripheral circuit.
USB host controller. (Compliant with Universal Serial Bus Specification Rev2.0)
IC2 Servo DSP with Built-in Audio DAC Built-in MP3·WMA·AAC decoder.
Built-in 1M-bit-SRAM.
IC3 4ch BTL Driver Driver for focusing & tracking coil, driver for sled & spindle motor, and operation
for disc loading & ejection.
IC4 iPod Authentication Connection authentication for iPod.
MFI341S2162: iPhone-compliant.

4
KDC-BT40U/BT645U
KDC-U546BT
COMPONENTS DESCRIPTION
Ref. No. Application / Function Operation / Condition / Compatibility
IC5 3.3V→5.0V Level Shift Converts communication signal from 3.3V to 5.0V.
IC6 5.0V→3.3V Level Shift Converts communication signal from 5.0V to 3.3V.
IC7 BU1.5V / BU3.3V Regulator Power supply for digital back-up.
Power supply for mechanism μ-COM.
IC8 E2PROM (Not used) Memory for ROM correction.
Countermeasure for software malfunction.
IC9 A3.3V Regulator Power supply for digital, analog and audio line.
Q3 D1.5V Output The output voltage in which the power supply that diverges from the BU1.5V line
is turned on and off is used as D1.5V.
Q5 B.3.3V Output The output voltage in which the power supply that diverges from the BU3.3V line
is turned on and off is used as D3.3V.
Q6 Control signal Inverter Controls Q5.
Q7 APC (Auto Power Control) Laser diode driver.
Q9 Control signal Inverter Because the detection logic of LOE/LIM_SW is different in the mechanism μ-COM
and the system μ-COM, the logic to the mechanism μ-COM side is reversed.
D1 Laser Diode Protection Prevents reverse bias which is applied to laser.
Laser destruction prevention.
D2,3 Countermeasure against Static Elec-
tricity
The potential difference between DGND and AGND is absorbed, and the malfunc-
tion by static electricity is prevented.

5
KDC-BT40U/BT645U
KDC-U546BT
MICROCOMPUTER’S TERMINAL DESCRIPTION
●SYSTEM μ-COM : IC1 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1~3 NC - Not used Output L fixed
4 REMO I Remote control input Detects pulse width
5 NC - Not used Output L fixed
6 BYTE - Setting of memory extension bus Connects to VSS
7 CNVSS - Connects to VSS
H: Rewritable (Only when flash ROM is used)
8 XCIN - 32.768kHz
9 XCOUT - 32.768kHz
10 RESET - L: Reset
11 XOUT - 16.0MHz
12 VSS -
13 XIN - 16.0MHz
14 VCC1 -
15 NC - Not used Output L fixed
16 LX REQ S I Communication request from slave unit
17 RDS CLK I RDS decoder clock input
18 PANEL DET I Panel communication detection H: Panel detached, L: Panel attached
19~22 NC - Not used Output L fixed
23 RDS QUAL I RDS decoder qualification input
24 F SYNC - Not used Output L fixed
25 RDS DATA I RDS decoder data input
26 BEEP O Beep output 2kHz / 1kHz
27 TUN SCL I/O ATOMIC I2C clock output
28 TUN SDA I/O ATOMIC I2C data input/output
29 VFD SYS DATA O VFD data output Communication begins after 500ms after VFD_BLK
becomes Hi.
30 VFD PAN DATA I VFD data input
31 VFD CL O VFD clock output 125kHz
32 VFD BLK O VFD driver reset output H: Reset canceled, L: Reset, Momentary power-down
or panel detached or 11 minutes after ACC OFF: L
33 BT SYS DATA O Data output to Bluetooth
34 BT BT DATA I Data input from Bluetooth
35 NC - Not used Output L fixed
36 ROTARY CW I VOL encoder input Detects pulse width
37 ROTARY CCW I VOL encoder input Detects pulse width
38 PON PANEL I/O Panel 5V control ON: L, Momentary power-down or panel detached or
11 minutes after ACC OFF: Hi-Z
39 EPM I Flash ROM EPM input L: Rewritable (Only when flash ROM is used)
Connects to VSS
39 ROMCOR DET I E2PROM writing request H: Writing
40~43 NC - Not used Output L fixed
44 VFD CE O VFD control request
45 S SYS DATA O Serial output to Bolero
46 S SOC DATA I Serial input from Bolero

6
KDC-BT40U/BT645U
KDC-U546BT
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
47 S SOC CLK I Serial clock input from Bolero
48 NC - Not used Output L fixed
49 S SOC REQ I Communication request from mecha-
nism to system μ-com
50 CD LOS SW I CD loading detection
51 CD DISC12 SW I 12cm disc detection
52 SOC MUTE I SOC mute request L: Mute request, H: Normal
52 CD MUTE I CD mute request L: Mute request, H: Normal
53 SOC RST O SOC reset H: Normal, L: Reset
54 S SYS REQ O Communication request from system
μ-com to mechanism
55 NC - Not used Output L fixed
56 CD MOTOR O CD motor control qRefer to the truth value table
57 CD LOEJ I/O CD motor control qRefer to the truth value table
58 SOC S STOP O SOC stop H: Normal, L: SOC stopped
59 CD LOE LIM SW I CD detection (Chucking SW) H: Loading completed, L: No disc
60 VCC2 -
61 NC - Not used Output L fixed
62 VSS -
63~65 NC - Not used Output L fixed
66 BT RST O Bluetooth module reset L: Normal, H: Bluetooth reset
67 PON FL O Key illumination power supply control H: ON, L: OFF
68 PS1 1 O Power supply IC control wRefer to the truth value table
69 PS1 2 O Power supply IC control wRefer to the truth value table
70 PS1 3 O Power supply IC control wRefer to the truth value table
71 PS2 1 O Power supply IC control wRefer to the truth value table
72 NC (PS2 2) - Not used Output L fixed
73 BU DET I Momentary power-down detection BU found: L, No BU or momentary power-down: H
74 ACC DET I ACC power supply detection ACC found: L, No ACC: H
75 AUD SDA I/O I2C data input/output MAX 400kHz
76 AUD SCL I/O I2C clock input/output MAX 400kHz
77 NC - Not used Output L fixed
78 FSEL O SW-REG frequency SW H: 2.04MHz, L: 1.68MHz
79 PON SWREG O SW-REG ON/OFF H: ON, L: OFF
80 LINE MUTE I Line mute detection Normal: Below 2.5V, NAVI mute: Over 2.5V
81 TYPE 1 I Destination SW
82 NC (TYPE 2) - Not used Output L fixed
83 PWIC DC ERR I Detection of power IC short-circuited
+B/GND
84 AUD DC ERR I DC offset detection
If DC offset is detected 20 times in 100ms with
condition below 1.0V, it will be judged as DC offset is
detected.
85 TUN SMETER I S-meter input
86 NC - Not used Output L fixed

7
KDC-BT40U/BT645U
KDC-U546BT
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
87 PWIC MUTE O Power IC mute STANDBY source or momentary power-down: L,
TEL mute: L
88 NC - Not used Output L fixed
89 PWIC STBY O Power IC standby control POWER ON: H, POWER OFF: L
90 MUTE I/O Mute L: Mute OFF, Hi-Z: Mute ON
91 LX MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF
92 LX CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF
93 LX RST O Forced reset to slave unit H: Reset, L: Normal
94 AVSS -
95 LX REQ M O Communication request to slave unit
96 VREF -
97 AVCC -
98 LX DATA S I Data from slave unit
99 LX DATA M O Data to slave unit
100 LX CLK I/O LX-BUS clock
• Truth value table
qCD motor control
CD MOTOR (Pin 56) CD LOEJ (Pin 57)
Stop L L
Load H L
Eject H H
Brake H Hi-z
wPower supply IC (IC4) control
SEL1 (Pin 10)
PS1-2 PS1-3 PS2-1 ILLUMI P-CON P-ANT
L L L OFF OFF OFF
L L H ON OFF OFF
H L H ON ON OFF
HHHONONON
SEL2 (Pin 11)
PS1-1 PS2-2 AUDIO/SW5 AM
L L OFF OFF
H L ON OFF
H H ON ON

8
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
■Example
Key Description of display Description
÷÷÷÷÷÷÷
A symbol “■” in the key column indicates that the key should be pressed and held.
Key Description of display Description
5
Disc Eject times
display
EJCNT :XXXXX Disc Eject times display (Max. 65535 times).
■5 While Disc Eject times is displayed, press and hold for 2
seconds or longer to clear Disc Eject times.
SEARCH
SRC
BAND
RETURN VOICE
EJECT
■How to enter the Test mode
Procedure Note
Press and hold the [1] key and [3] key and reset.
All lamps blinks when it is detected that the sub-clock resonator is disconnected.
When having started up in the Test mode, change the LINE MUTE inhibition time from 10 seconds to 1 second.
In the Test mode, do not write the detection information in the Data Flash ROM even if a DC Offset Error is detected.
Do not operate the DEMO mode in the Test mode, CD Mechanism Error Log Information Clear Mode, or DC Offset Error Detection Information
Clear Mode.
Also, when the source is STANDBY in the above mode, do not display DEMO ON/OFF switching items in the FUNCTION.
In the Test mode, the forced disc ejection operation is prohibited.
■How to clear the Test mode
Procedure Note
Reset, Momentary power down, ACC OFF, Power OFF, Panel detached. Clearing the Test mode
■Test mode default condition
Description Default values
Source STANDBY
Display Display lights are all turned on.
VOL -10dB (“30” is displayed.)

9
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
Description Default values
BASS BOOST OFF
AUX ON1
SystemQ / dB EQ NATURAL (FLAT)
BEEP Beeps when the key is pressed briefly.
PREOUT REAR
■Test mode specification in STANDBY source
Key Description of display Description
Common All lights ON. ÷÷÷÷÷÷÷ All lights ON.
1
(forward
rotation)
System μ-com
version display SYS0 1 – 3.00 System μ-com version display
BT module version
display BT :HXXXSXXX BT module version display
Mechanism model
name and mecha-
nism version display
9B30: Mechanism model name and mechanism version display
■1
Design version
display mode
ON/OFF
Design version information display mode
(sub-mode) ON/OFF
Press and hold this key for 1 second to display the design
version information.
∗Refer to “Design version information display mode” for the
details of display and operation procedure.
2 Serial No. display SN :00000000 Serial No. displayed (8 digits)
3Power ON time
display
PONTM :0HXX The 00~50 is displayed for “xx”. When less than 1 hour,
displayed by increments of 10 minutes.
PONTM :XXXXX
The 00001-10922 is displayed for “xxxxx”. MAX 10922 (hours)
4
DISC operation
times
display
CDTM :0HX X The 00~50 is displayed for “xx”. When less than 1 hour,
displayed by increments of 10 minutes.
CDTM :XXXXX The 00001-10922 is displayed for "XXXXX". MAX 10922
(hours)
5
DISC EJECT times
display
EJCNT :XXXXX Disc Eject times display. MAX 65535 (times)
■5While disc EJECT times is displayed, press and hold for 2
seconds or longer to clear disc EJECT times.
6
Data Flash ROM
writing-in times
display
DFCNT :XXXXX The number of data writing-in the Data Flash ROM is
displayed. MAX 10000 (times)
BAND ROM correction
version display
SR0001 MR0001
<System μ-com> <Mechanism μ-com>
The number is the ROM correction version number.
SR–––– MR––––
<System μ-com> <Mechanism μ-com>
When not written in yet.
SR∗∗∗∗ MR ∗∗∗∗
<System μ-com> <Mechanism μ-com>
When data not matched
∗Due to the difference in versions.

10
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
Key Description of display Description
■BAND BT device search
(The display blinks)
SEARCH I NG
Press and hold this key for 1 second to initiate the BT device
search.
The search is terminated when 1 device is found.
XXXXXXXXXXXXX When a device is found after the search, the name of that
device is displayed.
UNKNOWN Only when no device is found after the search, press the
[ROTARY] key briefly to re-initiate the search.
After the completion of the search, press and hold the [BAND]
key for 1 second to exit from the test mode.

Audio data
initialization AUD I O I N I T Audio setting value is re-set to the Test mode default value.
■

Clear the BT related
memory information
*1
INITIALIZE
Press and hold this key for 2 seconds.
The character string as shown in the left cell is displayed
while the BT related memory is being initialized.
BT INIT :OK
BT INIT :NG
This is to initialize the BT related memory to its factory de-
fault condition.
When the initialization is successfully completed, “OK” (up-
per) is displayed, and when the initialization is abnormally
completed, “NG” (lower) is displayed.

Forced Power OFF
information display
POFF ––– No forced Power OFF
POF F PNL Forced power OFF by communication error between system
μ-com and panel.
■

While the forced power OFF data is displayed, press and
hold for 2 seconds to clear the data.
VOICE
CD information
display mode
ON/OFF
Transition to the CD information
display mode (sub-mode)
∗Refer to “CD information display mode” for the details of
display and operation procedure. Press [VOICE] key briefly.
■VOICE Clear all of the CD information
Press and hold this key for 2 seconds in the CD information
display mode to clear all of the CD information.
Press and hold the [VOICE] key.
SEARCH
Information display
iPod authentication
IC installation
condition display
iPod :
iPod :OK
iPod :NG
iPod :
∗∗
iPod authentication IC installation condition display
When the display in the left cell is shown, press this key to
return to the normal display.
Blank: Searching and deciding the present status.
OK: Authentication IC has been installed.
NG: This is the iPod compatible model, but the
authentication IC is not yet installed.
∗∗: This is not the iPod compatible model.
■SEARCH
Preout switching
SWPRE REAR Pressing and holding this key for 1 second switches the
preout.
SWP R E S UB – W
RETURN
All lights ON /
All lights OFF
÷÷÷÷÷÷÷
Switch from “All lights ON” to “All lights OFF” and vice
versa.
÷÷÷÷÷÷÷
*1: This is a function to clear the information recorded in the flash memory, to clear the data flash ROM that has BT memory information to be
initialized with the “Data flash ROM clear” function, and to write the specific values in the ROM to initialize it to its factory default condition.
• Factory default condition
· To clear the pairing information (in the flash memory of the BT module)
· To clear the preset telephone numbers (in the data flash ROM)
· To write “KENWOOD BT CD/R-3P2” in the friendly name (in the flash memory of the BT module)
· To write “0000” in the PIN code (in the flash memory of the BT module)

11
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
• CD information display mode (sub-mode)
Key Key Description of display Description
BAND
(forward
rotation)

/

CD mechanism error
log display
MECH A E R 1 :X X
Mechanism error log 1 (Latest)
XX: Error number. The “--” is displayed in case there
is no error.
MECH A E R 2 :X X
Mechanism error log 2 (Latest)
XX: Error number. The “--” is displayed in case there
is no error.
MECH A E R 3 :X X
Mechanism error log 3 (Latest)
XX: Error number. The “--” is displayed in case there
is no error.

/

CD load error
information display
LOAD ER1 :XX
Load error switch 1
XX: The number of errors. The “--” is displayed in
case there is no error.
LOAD ER2 :XX
Load error switch 2
XX: The number of errors. The “--” is displayed in
case there is no error.

/

CD ejection error
information display
EJECT ER1 :XX
Ejection error switch 1
XX: The number of errors. The “--” is displayed in
case there is no error.
EJECT ER2 :XX
Ejection error switch 2
XX: The number of errors. The “--” is displayed in
case there is no error.
EJECT ER3 :XX
Ejection error switch 3
XX: The number of errors. The “--” is displayed in
case there is no error.
EJECT ER4 :XX
Ejection error switch 4
XX: The number of errors. The “--” is displayed in
case there is no error.

/

CD time code error
count information
display (Missing
counts)
CNT LOSE CD time code error count information (Missing
counts) mode is display.
CDDA :XX
Number of CD-DA error counts
XX: The number of errors. The “--” is displayed in
case there is no error.
CDROM :X X
CD-ROM (Compression file) number of count errors
XX: The number of errors. The “--” is displayed in
case there is no error.

/

CD time code error
count information
display (Count is not
updated.)
CNT STAY CD time code error count information
(Count is not updated) mode display.
CDDA :XX
Number of CD-DA error counts
XX: The number of errors. The “--” is displayed in
case there is no error.
CDROM :X X
CD-ROM (Compression file) number of count errors
XX: The number of errors. The “--” is displayed in
case there is no error.

12
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
• Design version information display mode (sub-mode)
Key Description of display Description
BAND
(forward
rotation)
Destination terminal
condition display TYPE21 :11 TYPE indicates μ-com destination, and indicates condition
of the destination terminal in real-time.
Development ID
condition display 0928WE2 –3.00 Development code - Version (system μ-com)
BT module address BTAD BT module address information display (in 12 digits)
(The display scrolls to display all of the digits)
BT module PIN code PIN : BT module PIN code display
■Test mode in Tuner source
If the following display is shown when the source is TUNER, it indicates an error.
Status Description of display Description
TUNER IC
communication error TUN CON NG This display indicates the status in which the communication with
TUNER IC is not possible.
The adjustment is not
yet made. ∗ERR∗A 9 8.3 A
This display indicates the status in which the TUNER adjustment
has never been made (Adjustment value: 0X00 or 0XFF)
However the following TUNER test mode functions are valid (Note
that the display, “∗ERR∗” remains as it is.)
• TUNER band switching operation
Key Description of display Description
BAND BAND switching
operation FM1–4 A 98.3A Every time when the [BAND] key is pressed, the BAND is
switched as listed in the next table for each TYPE.
MODEL (KDC-) BAND1 BAND2 BAND3 BAND4 BAND5 BAND6 Description
BT645U qFM1 FM2 FM3 wAM – – q→w
BT40U qFM1 FM2 FM3 wMW/LW – – q→w
U546BT qFM1 FM2 FM3 wMW eSW1 rSW2 q→w→e→r
• Switch in injection setting / packs setting
In the TUNER FM source, every time the [5] key is pressed and held for 1 second the injection setting switches in the following sequence of
order: AUTO →H →L →AUTO.
In the TUNER FM source, every time the [6] key is pressed and held for 1 second the packs setting switches in the following sequence of order:
AUTO →1 →2 →. . . 7 →AUTO.
In both settings, the default condition is AUTO, which is displayed as shown in the next table.
Key Description of display Description
■5Injection setting
switching
FM1–4 A 98.1A A: Injection setting AUTO
FM1–4 A 98.1H H: Injection setting H
FM1 – 4 A 9 8.1 L L: Injection setting L
■6Packs setting
switching
FM1–4 A 98.1A A: Packs setting AUTO
FM1–4 7 98.1A X: Packs setting 1~7

13
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
• TUNER setting adjustment mode
This mode is to adjust TUNER setting.
Key Note
■VOICE
Press this key to change the mode to the TUNER setting adjustment (Press and hold the key for 1 second).
When the source is FM, frequency is switched to 98.3MHz at the start of the adjustment mode.
Press and hold the [VOICE] key.
Procedures in the TUNER setting adjustment mode are as follows:
• Adjustment mode switching (AUTO/MANUAL)
Key Description of display Description
■BAND
(forward
rotation)
Level Offset
adjustment (Auto) A S–XX L–XX
Press and hold the [BAND] key for 1 second to select the
TUNER adjustment method (A: AUTO / M: MANUAL).
S-XX →Present S meter value (HeX)
L-XX →Level offset value (HeX)
∗When the level offset value is not yet adjusted (0XFF or
0X00), “--” is displayed.
Level Offset
adjustment (Manual) M S–XX L–XX
• Procedure in the AUTO adjustment mode
Key Description of display Description
ROTARY
In automatic
adjustment A S–XX L–XX Press this key briefly to start the automatic adjustment.
Completion of
automatic adjustment
Save the adjustment
value.
ADJ OK :XX
(Level offset value)
After the completion of the automatic adjustment, save the
level offset value in the Data Flash ROM and display the
resultant level offset value (HeX).
Failure of the
automatic adjustment
Cannot save the
adjustment value.
Save the failed value
(0XFF).
ADJ NG
Display shown when the automatic adjustment failed
(Write OXFF in the Data Flash ROM. →Given the OXFF
saved in the ROM, the adjustment starts with “--” when the
automatic adjustment mode is re-started.)
RETURN Mode clear
FM1–4 A 97.9A
This is to clear the FST adjustment mode (in normal
operation) (The display returns to the normal display and the
test mode is retained.) Frequency is switched to 97.9MHz.
∗ERR∗A97.9A
This is to clear the FST adjustment mode (when failed in the
automatic adjustment) (The display returns to the normal
display and the test mode is retained.)
Frequency is switched to 97.9MHz.
• Procedure in MANUAL adjustment mode
Key Description of display Description

/

■

/

Level Offset
adjustment (Manual) M S–XX L–XX Press [

/

] key for 500ms or longer to
continuously increase / decrease the adjustment value.
ROTARY
Completion of the
adjustment value
saving
ADJ OK :XX
(Level offset value)
Display when the adjustment value has been saved in
the Data Flash ROM
The saved level offset value (HeX) is displayed.
Failed to save the
adjustment value ADJ NG Display when the adjustment value has not been saved
in the Data Flash ROM

14
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
Key Description of display Description
RETURN Mode clear
FM1 – 4 A 9 7.9 A
This is to clear the FST adjustment mode (in normal
operation) (The display returns to the normal display
and the test mode is retained.) Frequency is switched
to 97.9MHz.
∗ERR∗A 9 7.9 A
This is to clear the FST adjustment mode (when failed
in the automatic adjustment) (The display returns to
the normal display and the test mode is retained.)
Frequency is switched to 97.9MHz.
After the TUNER setting adjustment, the entire test modes can be cleared with the reset button.
If you do not save the adjustment value in the Data Flash ROM after the adjustment, the value is not saved in the ROM.
When the level offset value is read out and found to be 0X00 or 0XFF, it is decided that the adjustment is not yet made.
The adjustment starts with the default value (OX3E) when the adjustment is re-started from the status in which it is not yet made.
Setting is not yet adjusted: L –––
[

/

] key operation
Start the adjustment: L E3–
[

/

] key operation
Increase / Decrease the adjustment value: L XX–
• S-meter voltage pass and fail evaluation mode
This mode is to display the S-meter present voltage (HeX) and to check and evaluate if the voltage is within the criteria or not (OK or NG).
Check and evaluate the voltage only after the completion of the TUNER setting adjustment. (When the setting is not yet adjusted, “--” is dis-
played.)
When receiving AM, do not select this mode.
In this mode, the BAND switching and SEEK operations such as operation of [BAND], [

/

], and [PRESET] keys shall be prohibited.
Key Description of display Description
RETURN
S-meter voltage
pass and fail
evaluation display
ON/OFF
S–MTR XX:OK
(S-meter value) (Evaluation result)
[S-meter value]
XX: Present S-meter value (HeX)
[S-meter value evaluation result]
OK: S-meter voltage is within the range of the criteria
(0XA3~0XAD)
NG: S-meter voltage is outside of the range of the criteria
(Outside of the above range)
--: TUNER setting is not yet adjusted.
S–MTR XX:NG
S–MTR XX:––
• RDS automatic measurement (KDC-BT40U only)
This automatic measurement is implemented in place of the visual inspection of the PS display that had been carried out in the production line.
Status Description of display Description
PS data reception RDS T EST
The P-CON is forcibly turned off when the display in the left cell is
shown.
P-CON is recovered by turning the power OFF and ON (Power OFF/ON).

15
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
■Test mode in CD source
Display mode default P-Time
• Procedure in CD-DA media (KTD-02A)
Key Description of display Operation

Track up procedure
Every time pressed, jumps to the track shown below.
No.9 →No.15 →No.10 →No.22 →No.12 →No.13 →
No.14 →No.9 (recursive)
But in case the disc has 8 tracks or less, playback starts
with track No.1 (at both of CD-DA and compressed file disc).

Track down
procedure Goes down by 1 track from the currently played track.
1 Jump procedure Jump to No.28. (0.7mm scratch for MUSIC line vibration
test)
2 Jump procedure Jump to No.14. (Blurring surface disc: TCD-731RA Tr14)
3
(forward
rotation)
Information display
Mechanism model name
Mechanism version
9B30: Mechanism model name and mechanism version display
Information display
Mechanism Servo
version
SERV: Mechanism servo table version display
Information display
Mechanism Boot
program version
BOOT: Mechanism boot program version display
4 Jump procedure Jump to No.15. Set the volume value to “26”.
(For 20Hz 0dB DC protection error operation FCT checking)
5 Jump procedure ∗Switch the track jump from No.9 to No.22 or
from No.22 to No.9 (No.9 ↔No.22)
When the track No.22 is being played back, this key makes
the track jump to No.9.
When the track No.9 is being played back, this key makes
the track jump to No.22.
6PLAY/PAUSE
procedure
This key is to switch from PLAY to PAUSE and vice versa
(PLAY/PAUSE). (Normal operation)
• Procedure in compressed media
Key Description of display Description
– File format display (MP3) MP 3
The file format is displayed just before the file playback.
– File format display (WMA) WM A
– File format display (AAC) AAC
■Backup current measurement
Procedure Note
Power on during ACC OFF (Back Up ON) MUTE terminal is turned OFF after 2 seconds, not after 15 seconds.
(During this time, the CD mechanism does not function.)

16
KDC-BT40U/BT645U
KDC-U546BT
TEST MODE
■Clearing DC offset error detection information (Clear the Data Flash ROM)
Procedure Note
While pressing and holding [3] key and [6] key, reset-start. To enter DC offset error display mode.
The transition to this mode shall be possible even if the DC offset error has been detected.
This mode is cancelled by resetting. (The last screen will not be retained.)
Procedure Description of display Description
While pressing and
holding [3] key and
[6] key, reset-start.
DC ERR When DC offset error is detected (when either one of capacitor leak is
leaking, or an improper connection or other error is detected)
DC OK When DC offset error is not detected (when none of capacitor leak, no
improper connection or other error is detected)
1
DC1 ERR When improper connection or other DC offset errors are detected.
DC1 OK When improper connection or other DC offset errors are detected.
■1DC1 OK
When there is any misconnection detected or when the DC offset
error is displayed during the other detection period, press and hold
this key for 2 seconds to clear the detection information.
(Clear the Data Flash ROM)
2DC2 4 Capacitor leak detection period
display of the detected times of capacitor leaks. (0~4)
■2DC2 0 Press and hold this key for 2 seconds when a capacitor leak is
detected to clear the number of detection. (Clear the Data Flash ROM)
■FM/AM Channel space switching (KDC-BT645U/U546BT only)
Procedure Note
While Power OFF, pressing and holding [1] key and [5] key, and press
[SRC] key to Power ON
FM200kHz/AM10kHz ↔FM50kHz/AM9kHz (KDC-BT645U)
FM50kHz/MW9kHz/SW5kHz ↔FM200kHz/AM10kHz (KDC-U546BT)
■Forced update
Procedure Note
Start resetting while keeping pressing the [1] key and [SEARCH] key. To enter the forced update mode.
After entering the mode, make the normal SRC feed with the [SRC] key, DISC insertion, and USB insertion.
The display of the SRC switches and READING is shown in the same manner as the display of the normal mode.
After the completion of READING, start the UPDATE if there is an update file.
If there is no update file, display “NO FILE”.
Procedure Description of display Description
F/W UP MODE STANDBY condition in the forced update mode
READ I NG After the SRC switches, the “READING” is displayed during reading
(The display blinks)
NO F I L E The “NO FILE” is displayed when there is no update file
UPDAT I NG The UPDATE in progress is displayed after it is verified that there is an update
file and while updating the file (The display blinks).
COMPLETE Completion of UPDATE
UPDATE ERR UPDATE error

17
KDC-BT40U/BT645U
KDC-U546BT
Refer to the schematic diagram for
the values of resistors and capaci-
tors.
EDCBA
1
2
3
4
5
6
7
PC BOARD
(COMPONENT SIDE VIEW)
PC BOARD
(FOIL SIDE VIEW)
VOUT
EJECT
5
1
SRC
BAND
2
RETURN
AUX
34
DISP
W1
C52
C54
C55
C56
C57
C59
C60
C61
C62
C65
USB
VCC
VOL AUDIO
49 1
41
G
G
IC2
D54
D63
D55
D58
D62
D53
D52
D67
D69
D72
D74
D68
D71
D70
D66
D73
D51
D85
D84
D86
D87
ED1
J3
J2
S1
D56
D57
D59
D61
D60
D65
SWITCH UNIT
X16-678x-xx (J76-0650-02)
TP46
TP37
TP38
TP39 TP40 TP41
TP42
TP43
TP45
R11
R58
R17
R59
R60
R61
C14
C15
C16
C17
C100
R105
R4
R2
R3
R21
C41
C42
C58
C71
C72
CP12
R16
C82 C81
R14
R1
R103
R104
R8
R6
R7
R5
1
2
1
24
23
C10
C11
R10
R12
R52
R54
R55
R56
R57
C12
C83
CP14
R51
C21
R22
C13
CP11
R32
R31
R13
R15
R82
R81
CP13 CP15
R53
2
BE
BE
BEBE
SWITCH UNIT
X16-678x-xx (J76-0650-02)
D6
D1
D2
D3
D5
D4
D7
D8
J4
Q21
Q22
Q23
D9
CN1
D79
D10
D82
Q20
D81
TP71
TP72
TP82
TP81
TP87
TP88 TP89
TP90
TP91
TP92 TP93
TP95
TP96
TP31
X16-678x-xx
Ref. No. Address
Q20 5D
Q21 5D
Q22 5D
Q23 5D
X16-678x-xx
Ref. No. Address
IC2 3B

18
KDC-BT40U/BT645U
KDC-U546BT
PC BOARD (COMPONENT SIDE VIEW)
FGHIJ
1
2
3
4
5
6
7
1
1
1
5V
GND
DATA
CLK
1
13
910 6 7 5 1
11 12 8 4 3 2 27
226
W21
W23
W22
R353
L551
W6
R352
C603 R601
R602
R603
R605
R606
R607
R608 R609
R610
R611
R612
W24
W608
W30
L401
W53
R809
C401
C805
X3
W102
C301
C302
C308
C703
C704
C705
C706
W46
C403
W99
R541
C64
R118
R112
R334
R344
R345
R346
W106
W39
W60
W62
C702
C701
C519
L502
L508
L507
L506
L503
L505
L504
L501
X501
R331
R811
R109
R810
R59
R62
C102
C101
C203
C202
C809
C807
C806
R119
R108
C59
R803
R808
R271
R204
R209
R210
23
24
1
2
C920
C921
R324
R275
R802
R804
R805
CP203
CP202
CP201
R307
R306
R325
R326
R328
C73
R268
R813
X2
X1
R274
R302
1
2
23
24
L51 C57
R342
C55
C58
R53
R54
C56
R55
R56
R57
L73
C875
C876
R715
R716
R709
R710
R703 R704
R717
R718
R711
R712
R705
R706
100 76
75
5125
26 50
5
10
6
EBEB EBEB BE
BE
45
31
EB
EB
BE
ELECTRIC UNIT
X34-662x-xx (J76-0648-02)
IC6
IC1
IC52
IC51
J5
D306
J3
D801
D802
D304
D305
D312
D311
D603
P1
D401
D109
D108
D1
D106
W551
D602
D601
D604
D605
CN2
J4
S3
Q101
Q103
Q104
Q705
Q706
Q703
Q704
D51
Q701
Q702

19
KDC-BT40U/BT645U
KDC-U546BT
Refer to the schematic diagram for the values of resistors and capacitors.
ONMLK
1
2
3
4
5
6
7
1
112
8
9
1
16
W202
C2
R106
C912
W64
C5
W98
C7
W101
W5
W105
R101
R102
W102
C916
C1
W103
W104
W89
L1
R1
W2
R15
R107
W1
W87
W91
W92
W68
W74
W3
R109
R151
C101
R915
R916
R152
R918
R108
R2
R271
R3
R110
L72
R324
R307
R306
R328
C73
R278
R279
R302
R5
C17
L51 C57
C922
R935
C913
L71
1 2
13 14
5
DGS
SGD
EB
BE
EB
BE
B
EB
E
IC4
5
2
D5
D650
A900
D1
J1
D4
Q2
D2
0
8
D107
06
S3
Q11
CN900
Q14
Q101
Q901
D102
D104
Q902
Q13
D51
X34-662x-xx
Ref. No. Address
IC1 5H
IC4 4L
IC6 2I
IC51 4J
IC52 5J
Q2 2M
Q11 3L
Q13 4K
Q14 4L
Q101 3K
Q103 3J
Q104 3J
Q701 3F
Q702 3G
Q703 3G
Q704 3G
Q705 3G
Q706 3G
Q901 5M
Q902 6K

20
KDC-BT40U/BT645U
KDC-U546BT
PQRST
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
ELECTRIC UNIT
X34-662x-xx (J76-0648-02)
8
1
1
C910
C201
R2
0
R218
R225
C911
R117
C11
R401
R912
R913
R910
R911
C9
C914
R340
C915
C404
TH1
C3
C4
C14
C
2
R58
C801
R919
C907
C908
C802
R111
R113
R115
R116
R
R226
C904 R903
R905
R906
R806
C906
C309
R347
C306 C307
C918
C803
C804
R920
R333
R114
R330
C63
R332
R343 R336
R337
R338
R339
R341
C405
C406
R301
R322
R327
R318
R812
R320
R260
R261
R263
R262
R208
C851
C852
R281
R282
C857
C855
C69
C853
C856
C858
C854
C859
C407
R
6
C310 C311
R349
R348
C54
C105
C923
R936/L900 R650
C20
L751/R405
L750/R406
14
28 15
5
4
EB
OG I
BE
EB
BE
EB
BE
IC2
IC901
IC900
D3
Q301
D110
Q12
D101
D103
Q102
Q105
Q3
Q53
D301
VCC
EPM
BUSY
CE
RXD
SCLK
TXD
GND
A-DC-ERR
AC-GND
SEL2
SEL1
TP54
TP315
TP10
TP316
TP18
TP52
TP17
RST