Kenwood KDC-348U User manual

This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
PbF
© 2011-4 PRINTED IN JAPAN
B53-0844-00 (N)303
SERVICE MANUAL
KDC-348U/4751SD
KDC-BT41U/BT648U
KDC-U4549/U4549SD/U549BT
KDC-X395/X695
CD RECEIVER
TDF SPARE-PANEL
MAIN UNIT NAME TDF PARTS No. TDF NAME
KDC-348U Y33-3490-11 TDF-113D
KDC-4751SD Y33-3482-73 TDF-4751SD
KDC-BT41U Y33-3482-71 TDF-BT41U
KDC-BT648U
KDC-U4549 Y33-3490-21 TDF-U4549
KDC-U4549SD Y33-3480-22 TDF-U4549SD
KDC-U549BT Y33-3480-21 TDF-U549BT
KDC-X395 Y33-3490-10 TDF-113DX
KDC-X695 Y33-3480-11 TDF-116DX
KDC-4751SD : Panel assy (A64-5245-02)
Y33-3480-10 TDF-BT116D
After replacing E2PROM (IC203 on X34), tuner setting adjustment is needed.
The adjustment is that to perform the “TUNER Setting Adjustment Mode” (Page 13).
Tuner setting adjustment after replacing E2PROM
Mounting hardware assy
(J22-2049-03)
Lever
(D10-7139-04) x2
* DC cord
(E30-6933-05)
* Screw set
(N99-1757-15)
* Carrying case
(W01-xxxx-xx)
* DC cord
(E30-6934-05)
* Tap screw (2x8)
(N80-2008-48)
* Plastic cabinet assy
(A02-2757-13)
* Remote controller assy (RC-405)
(A70-2104-05)
* Trim plate
(xxx-xxxx-xx)
* Microphone (3m)
(W01-1768-15)
* Depends on the model. Refer to the parts list.
KDC-X695 : Panel assy (A64-5241-12)
KDC-BT648U : Panel assy (A64-5240-02) KDC-U4549SD : Panel assy (A64-5246-12)
KDC-U549BT : Panel assy (A64-5244-12)
KDC-BT41U : Panel assy (A64-5242-12)

2
KDC-348U/4751SD/BT41U/BT648U /U4549/U4549SD/U549BT/X395/X695
BLOCK DIAGRAM
ELECTRIC UNIT (X34- )
SWITCH UNIT (X16- )
E-VOL
IC401
SYSTEM u-COM
SW14V
Q3,4
A8V
BU5V
SW5V
RESET
IC202
RESET SW
IC201
IC801
J1
ILLUMI+B
J701
MUTE
Q707,708
IC501
∗J601
S301
A8V
IC1
IC
SUPPLY
POWER
MUTE
PRE
PRE-OUT
DC-CN
BU
DC/DC5V
Q51
CD
MECHA
DME1
SW
HI-SIDE
IC71
∗A901
LX-BUS
FL
ED1
MATRIX
KEY
SHIFT
LEVEL
IC301
SERVO+B
∗IC902
BT3.3V
BT
MODULE
BU5V
TUNER
ATOMIC
BU5V
MIC CN
∗J921
602
SHIFT
LEVEL
BU3.3V
Q701-706
W551
BU
POWER IC
BU5V BU3.3V
∗IC601,
ROM
E2P
IC203
SW3.3V
BU5V
4VPRE+B A8V
SHIFT
LEVEL
SWREG5V
IC802
iPod
AUTHENTICATION
∗IC261
SW3.3V
AM+BLPF
∗IC901
SW
ANALOG
∗IC921
AGC AMP
∗IC451
SPE-ANA SWREG5V
BT3.3V
TYPE
1,2
BU3.3V
∗CN901
SD SLOTSD3.3V
SURGE
DET
Q102
BU DET
Q301
Q101
ACC DET
∗Q105
ILLUMI DET
LINE MUTE
D105
AM+B
SHIFT
LEVEL
Q5-10
SERVO+B
Q1,2
4VPRE+B
∗Q91,92
BU3.3V
SW3.3V
∗Q302
Q103
PANEL3.3V
Q301
BU3.3V
BU3.3V or SW3.3V
BU5V
SWREG5V
4VPRE+B
SERVO+B
BU3.3V
SW3.3V
PANEL3.3V
∗Q951
SD3.3V
BT3.3V
USB5V
SD3.3V BU3.3V
SWREG5V
SW3.3V
FL+B
REMOTE ILLUMI
KEY
CN DET
USB CN
J3 J1
CONNECTOR
IC2
to GND
AUX CN
J2
USB5V
J301
ILLUMI+B PANEL3.3V
ROTARY
ENCODER
S1
SW3.3V FL+B
MIC CN
∗CN1
SWREG5V
BU DET
1
1
2
PS1-1
ACC-DET
∗OME-RC
FRONT/REAR/NF
PS1-2
PS1-3
P-ANT
P-CON
MUTE
OEM RC
ACC
BU
FRONT L/R
REAR L/R
2
(4MHz)
2219 8 6
22
1
1333
1
2
2
5
ILLUMI
P-ANT
ACC
ILLUMI
MUTE
OEM RC
P-CON
ILLUMI
ACC
MUTE
P-ANT
P-CON
4
PON-PAN3
PON-SW3
PON-4VPRE
ILL-DET
PON-PAN3
PON-4VPRE
∗SD-PWR
SW-VBUS
PS1-3
PON-SW3
PON-SWERG
ACC-DET
LINE-MUTE
ILLUMI-DET
BU-DET
PS1-1
PS2-1
SD PWR
VBUS OC SW VBUS
PON-SWREG
FSEL
PS2-1
PS1-2
LINE MUTE
BU-DET
FSEL
VBUS-OC
MAIN CLOCK = 48MHz (CRYSTAL 12MHz)
SUB CLOCK = 32.768kHz (QUARTZ)
(2.8V)
211
OEM RC
5
9

3
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
BLOCK DIAGRAM
DPU1
CD PLAYER UNIT (X32-6250-02) BOARD
MOTHER
(X34- )
EF
A
C
B
TR COIL
FO COIL
APC
IC4
16.934MHz
CLOCK
IC3
LOADING &
MOTOR
DRIVER
MOTOR
SPINDLE
S2
S1
SLED
MOTOR
DM1
DM2
X1
Q1
RF AMP
SERVO
MP3 DECODER
WMA DECODER
1M bit SRAM
PROCESSOR
AAC DECODER
+
+
+
+
+
LEVEL SHIFT
RESISTOR
FILTER
FILTER
D1.5V
IC5
Q14 REG
BU1.5V/
OUTPUT
D3.3V
VREF
12EJE-SW
LOS-SW
LOE-SW
MOTOR
LO/EJ
A.GND
TR OUT
FO OUT
DM OUT
FM OUT
A3.3V
LD
SIGNAL A/B/C/E/F
S.GND
S7.5V
FO OUT
TR OUT
DM OUT
FM OUT
DRV MUTE
SO
SRAM STB
SI
BUCK
CCE
PIO0
R15
SRAM STB
BUCK
CCE
PIO0
SO
SI
MRST MRST
C43
C44
Rch
Lch Lch
Rch
ZDET MUTE L/R
D.GND
D GND BU1.5V D1.5V D3.3V
AGND
BU5V
P.ON
PD

4
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
COMPONENTS DESCRIPTION
●ELECTRIC UNIT (X34-696x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Power Supply IC Outputs 5Vx2, 8V, 8.3V, 10.3V, P-CON, P-ANT.
IC21 3.3V AVR IC Power supply for BU+3.3V to μ-COM.
IC51 SW REG Power supply for D+5.1V to USB and panel.
IC71 Hi-side SW USB over-current detection.
IC201 System μ-COM Controls FM/AM tuner, CD mechanism, panel, volume.
IC202 Reset IC Lo when detection voltage goes below 2.8V.
IC203 E2PROM For log memory.
IC261 iPod Authentication IC For Apple authentication.
IC301 3.3V to 5V Level shift.
IC401 E-VOL Controls the source and volume.
IC501 ATomIC RDS Tuner IC.
IC601,602 3.3V to 5V Level shift.
IC801 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC802 3.3V to 5V Level shift.
IC901 BT LPF Bluetooth output low pass filter.
IC902 3.3V AVR Power supply for BT/SD+3.3V.
IC921 Switch IC MIC switching signal (Panel microphone/ Rear microphone)
Q1,2 SERVO+B AVR When Q2’s base goes Hi, AVR outputs 7.5V.
Q3,4 Control SW for SERVO+B ON when Q3’s base goes Hi.
Q5,6 Control SW for IC1 ON when Q5’s base goes Hi.
Q7,8 Control SW for IC1 ON when Q7’s base goes Hi.
Q9,10 Control SW for IC1 ON when Q9’s base goes Hi.
Q51 FREQ CONT SW for IC51 1.1MHz when the base goes Lo, 1.7MHz when the base goes Hi.
Q91,92 4V PREOUT+B AVR When Q92’s base goes Hi, AVR outputs 12V.
Q93,94 CONT SW for 4V PREOUT+B ON when Q94’s base goes Hi.
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 Mute CONT ON when the base goes Hi.
Q301 PAN3.3V SW ON when the base goes Lo.
Q302 SW3.3V SW ON when the base goes Lo.
Q701,702 Pre-out Mute SW When one of 2 bases goes Hi, pre-out is muted.
Q703,704 Pre-out Mute SW When one of 2 bases goes Hi, pre-out is muted.
Q705,706 Pre-out Mute SW When one of 2 bases goes Hi, pre-out is muted.
Q707,708 Mute Driver for Pre-out ON when the base goes Lo.
Q921 MIC SW CONT Rear MIC when the base goes Lo, panel MIC when the base goes Hi.
Q951 SD3.3V SW ON when the base goes Lo.

5
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
●CD PLAYER UNIT (X32-6250-02)
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/ACC decoder and 1M-bit-SRAM.
IC5 BU1.5V/D3.3V REG. Power supply for BU1.5V.
Power supply for digital/analogue/audio 3.3V.
Q1 APC (Auto Power Control) Drives LD (Laser Diode).
Q14 D1.5V Output Switches ON/OFF at one end of BU1.5V line which is separated into 2 directions.
Uses output voltage as D1.5V.
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-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
MICROCOMPUTER’S TERMINAL DESCRIPTION
●System μ-COM : IC201 (X34- : ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1,2 NC - Not used
3 AVSS - Reference GND for A/D converter Connects to GND even when A/D converter is
not used
4 VREFH - Reference power supply for A/D converter Connects to +B even when A/D converter is not
used
5 RESET I Reset input
6 MODE I Mode Connects to GND
7 IPOD SDA I/O
I2C data input/output for iPod authentication IC
8 IPOD SCL O I2C clock output for iPod authentication IC
9 IPOD RST O Reset signal for iPod authentication IC
10 ROTARY CW I VOL encoder input Pulse width detection
11 VFD DATA I/O VFD data input/output VFD data input/output
12 VFD PAN DATA I VFD data input VFD data input
13 VFD CLK O VFD clock output 125kHz
14 ROTARY CCW I VOL encoder input Pulse width detection
15 DVSS - GND
16 VFD RST O VFD driver reset output
H: Reset cancelled, L: Reset
Momentary power down or panel detached or
11 minutes after ACC OFF: L
17 VFD CE O VFD control request
18 PON SW3 I/O SW3.3V control ON: L, OFF: Hi-Z
19 BSIF LRCK O BS LRCK output
20 BSIF BCK O BS BCK output
21 BSIF DATA O BS DATA output
22 BSIF GATE O Data transfer starting signal
23 BSIF ST REQ I Data input request signal
24 MIC SW O BT microphone switching (KDC-BT648U) L: Panel microphone, H: Rear microphone
25 PON PANEL3 I/O PAN3.3V control ON: L, Momentary power down or panel de-
tached or 11 minutes after ACC OFF: Hi-Z
26 NC - Not used Output L fixed
27 PANEL DET I Panel connection detection H: No panel, L: Panel attached
28 NC - Not used Output L fixed
29 CD BREAK O CD motor brake qRefer to the truth value table
30 CD LOEJ O CD motor control qRefer to the truth value table
31 CD PON I/O CD mechanism power supply control output H: Power supply ON, Hi-Z: Power supply OFF
32 CD LOE LIM SW I CD detection (Chucking SW) H: Loading completed, L: No disc
33 CD SRAM STBY O Decoder SRAM standby control L: SRAM standby
34 CD REQ I Communication request from mechanism DSP H: Data request
35 CD LOS SW I CD loading detection
36 CD SO O Serial interface transmission
37 CD SI I Serial interface reception
38 CD CLK O Serial interface clock output 1MHz
39 BEEP O Beep output 2kHz/1kHz
40 CD DISC12 SW I 12cm disc detection

7
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
41 ZDET IN I 0-bit mute request H: Mute request, L: Normal play
42 CD RST O CD mechanism reset H: Normal, L: Reset
43 CD CCE O CD mechanism chip enable
44 CD DRIVE MUTE O CD motor driver mute output
45 CD MOTOR O CD motor switching control qRefer to the truth value table
46 NC - Not used Output L fixed
47 DVCC3 - Power supply
48 DVSS - GND
49,50 NC - Not used Output L fixed
51 SD CD I SD card insert detection L: SD found
52 SD PWR I/O SD block power supply control L: POWER ON, Hi-Z: POWER OFF
53 BT RST O BT module reset L: BT reset, H: Normal
53 SD CS O CS output to SD
54~56 NC - Not used Output L fixed
57 PS1-1 O Power supply IC control wRefer to the truth value table
58 PS1-2 O Power supply IC control wRefer to the truth value table
59 PS1-3 O Power supply IC control wRefer to the truth value table
60 PS2-1 O Power supply IC control wRefer to the truth value table
61 NC - Not used Output L fixed
62 FSEL1 O SW-REG frequency switching
63 NC - SW-REG frequency switching Output L fixed
64 PON SW-REG O SW-REG ON/OFF L: OFF, H: ON
65 BT SYS DATA O Data output to BT
65 SD DO O Data output to SD
66 BT BT DATA I Data input from BT
66 SD DI I Data input from SD
67 SD CLK O Clock output to SD
68~70 NC - Not used Output L fixed
71 ILLUMI DET I Dimmer illumination detection L: ON, H: OFF
72 BU DET I Momentary power-down detection
BU found: L,
No BU or momentary power down: H (Operates
less than 4ms after momentary power down)
73 ACC DET I ACC detection ACC found: L, No ACC: H
74 NC - Not used Output L fixed
75 PON 4V-PRE I/O 4V-PRE power supply control (eXcelon model) H: ON, Hi-Z: OFF
76 SA RST O Reset output for spectrum analyzer H: Reset cancelled, L: Reset
77 SA CLK O Clock output for spectrum analyzer
78 MUTE 0 O Front direct mute L: Mute ON (Time constant solo setting: 10ms),
H: Normal
79 MUTE 1 O Rear direct mute L: Mute ON (Time constant solo setting: 10ms),
H: Normal
80 MUTE 2 O Other direct mute
L: Mute ON (Time constant solo setting: 10ms),
H: Normal (Countermeasure against IC2 shock
noise)
MICROCOMPUTER’S TERMINAL DESCRIPTION

8
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
81 MUTE AFS I/O AFS mute L: Mute ON (Time constant solo setting: 0.5ms),
Hi-Z: Normal
82 PWIC MUTE O Power IC mute STANDBY source or momentary power down: L,
TEL mute: L
83 PWIC STBY O Power IC standby control POWER ON: H, POWER OFF: L
84 PWIC DC ERR I Detection of power IC’s +B and GND short-
circuited
85 LX DATA M O Data to slave unit SIO mode transmission
86 LX DATA S I Data from slave unit SIO mode reception
87 LX CLK I/O LX-BUS clock SIO mode clock (125kHz or 107kHz)
88 NC - Not used Output L fixed
89 DVCC3 - Power supply
90 DVSS - GND
91 SW DIO - For on-board writing
92 SW CLK - For on-board writing
93 TRACE CLK - For debug
94 TRACE DATA 0 - For debug
95 TRACE DATA 1 - For debug
96 TRACE DATA 2 - For debug
97 TRACE DATA 3 - For debug
98 AUD SDA I/O I2C data input/output (E-VOL IC control) Communication with E2PROM for system
μ-COM data keeping
99 AUD SCL O I2C clock input/output (E-VOL IC control) Communication with E2PROM for system
μ-COM data keeping
100 LX RST O Forced reset to slave unit H: Reset, L: Normal
101 LX MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF
102 LX REQ M O Communication request to slave unit
103 LX CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF
104 USB PON O USB P.ON output H: ON, L: OFF
105 USB OC I USB over-current detection L: Detected, H: Normal
106 NC - Not used Output L fixed
107 MUTE PRE O External preout mute O-bit or momentary power down: L, L: Mute ON
108 MUTE PRE SW O External preout mute (SUB) O-bit or momentary power down: L, L: Mute ON
109 LX REQ S I Communication request from slave unit For external interrupt
110 TUN SDA I/O I2C data input/output (Tuner IC control)
111 TUN SCL O I2C clock output (Tuner IC control) I2C clock frequency: 200kHz
112 REMO I Input signal of remote control reception and
wired remote control Pulse width detection
113 REMO I Remote control signal input Even pin No.112 is being short-circuited, input
signal can be ignored in software
114 REG VCC3 - Power supply
115 XT1 I Low frequency resonator connection Sub clock: 32.768kHz
116 XT2 O Low frequency resonator connection Sub clock: 32.768kHz
117 CVCC3 - Power supply
118 X1 I High frequency resonator connection Main clock: 12MHz
119 CVSS - GND
MICROCOMPUTER’S TERMINAL DESCRIPTION

9
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
120 X2 O High frequency resonator connection Main clock: 12MHz
121 DVCC3 - Power supply
122 DVSS/REGVSS - GND
123 USB D+ I/O USB data connection
124 USB D- I/O USB data connection
125 NM IN I Non-maskabe interrupt
126 TEST1 - For test Output L fixed
127 TEST2 - For test Output L fixed
128,129 NC - Not used Output L fixed
130 AVCC3 - Power supply
131 SA IN I Input data for spectrum analyzer
132 AUD DC ERR I DC offset detection
133 NC - Not used
134 LINE MUTE I Line mute detection TEL mute: Below 1V (Model without BT func-
tion), NAVI mute: Over 2.5V
135~138 NC - Not used
139 TYPE 1 I Destination switching
140 TYPE 2 I Destination switching
141,142 NC - Not used
143 SERIAL DET I For serial number writing
144 NC - Not used
Truth value table
qCD motor control
CD MOTOR (Pin 45) CD LOEJ (Pin 30) CD BRAKE (Pin 29)
Standby L L L
Eject H H L
Load H L L
Brake H H/L H
wPower supply IC control SEL1 (Pin No.10 of IC1)
PS1-2 (Pin 58) PS1-3 (Pin 59) PS2-1 (Pin 60) ILLUMI P-CON P-ANT
L L L OFF OFF OFF
L L H ON OFF OFF
H L H ON ON OFF
H H H ON ON ON
wPower supply IC control SEL1 (Pin No.11 of IC1)
PS1-1 (Pin 57) AUDIO/SW5/AM
L OFF
HON
HON
MICROCOMPUTER’S TERMINAL DESCRIPTION

10
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
1. Panel
ACCENT
SEARCH
RETURN VOL
2. How to enter each Test Mode
Test Mode name Operation
Production Test Mode Press and hold [1] key and [3] key and reset.
Service Test Mode In the STANDBY source, while pressing and holding [2] key, press [6] key for 7 seconds.
(Starting to press [2] key and [6] key at the same time can not be entered into the mode)
Service information clear mode Press and hold [2] key and [5] key and reset.
DC Error Information Mode Press and hold [3] key and [6] key and reset.
Version display mode *1 While pressing and holding [RETURN] key, press [DISP] key.
Forced update mode Press and hold [1] key and [SEARCH] key and reset.
✳Transition to Test Mode shall be available during DC Error detection.
*1: The model that does not support firmware update function will not also support the version display mode.
3. How to release each Test Mode
• Reset
• Momentary voltage drop
• ACC OFF
• POWER OFF
• Panel Detach
• Arbitrary key operation (firmware and version display only)
4. Production Test Mode
●How to enter the production test mode
Press and hold [1] key and [3] key and reset.
●Default status immediately after the mode activation
It shall be same as normal RST start in other settings than the following.
Details
Difference in action
Period to prohibit TEL/LINE MUTE immediately
after activation (normally 10 seconds) 1 second
Initial CD mechanism operation at start-up Prohibited
Write-in to E2PROM when detecting a DC error Prohibited
Demo Mode ON/OFF Setting Menu Prohibited
Power supply during ACC OFF (Back Up On) MUTE terminal turns OFF after 2 seconds (When the terminal
is turned OFF, the CD mechanism does not function)
BEEP sound Beep with short-pressing in any functions
TEST MODE

11
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Details
Various setting value
Volume 30 (-10dB)
BASS BOOST/LOUD OFF
EQ NATURAL
Fader/Balance Center
DEMO Mode Setting OFF
AUX Setting ON1
●Mode structure
Some Test Modes change according to the current source.
The following table shows the current source in Set and the related test mode status.
Model source Test mode
POWER OFF -
Standby STANDBY Test Mode
TUNER TUNER Test Mode
CD CD Test Mode
SD -
BT BT Test Mode (BT built-in model)
USB -
AUX -
●Basic operation of the [ACCENT] keys
BT built-in model
Source Condition Operation
Other than BT Mode/HF interruption BT Mode source
■Easy Setting
BT Mode
Transmit possible condition (displaying phone number) Transmit
Transmit impossible condition BT Mode clear
■Easy Setting
HF interruption
Receiving Off Hook (connect)
Transmitting Off Hook (disconnect)
Connected Off Hook (disconnect)
Connected (receiving interruption) Interruption receiving Menu
Connected (receiving interruption Menu) Invalid
Connected (interruption connected) Disconnect (Parrot dependent)
■(Invalid)
SD built-in model
Source Condition Operation
Other than SD SRC
SD inserted SD SRC
SD not inserted Invalid
■Invalid
SD SRC -
-
TEST MODE

12
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
USB model
Source Condition Operation
Other than iPod SRC
iPod inserted iPod SRC
iPod not inserted Invalid
■Invalid
iPod SRC Invalid
■ iPod By Hand Mode
●Mode content
Syscon shall display the following information after entering this mode. The operation shown below shall be workable.
Display content Details
÷÷÷÷÷÷÷
All lights ON
●STANDBY Test Mode Specification
Operation Display content Details
1 (Toggle)
Syscom version display SYS01–200
SYS03–200
Syscom version
SYS01: BT/USB 13 digit model
SYS03: SD MODEL
BT module version
display BT HXXXSXXXXXBT module/version displlay (Target model: BT)
Information display
Mechanism model name
Mechanism version
9B20: Mechanism model name and mechanism version
display
All lights ON All lights ON (Switch with other display)
2 (Toggle)
Serial No. display SN :00000000Serial No. display (8-digit)
✳Display as it is in hex
All lights ON :All lights ON (Switch with other display)
3 (Toggle) All lights ON/OFF :
:All lights ON/OFF with toggle
4 (Toggle)
USB
model only
Information display iPod
verification IC mount
status display
iPod :
iPod :OK
iPod :NG
iPod :
∗∗
iPod verification IC mount status display
Blank: Verifying
OK: Verification IC mounted
NG: Verification IC not mounted
∗∗: Non-iPod support model
All lights ON/TEST All lights ON (Switch to other display)
5 (Toggle) Preout switch SWP R E R E A R
SWP R E S U B – W
Switch Preout with toggle
(KDC-4751SD/BT41U/U549BT)
6 (Toggle) All lights ON/OFF Switches between all lights ON and all lights OFF
SOURCE
transition Mode release Return to Normal mode
■RETURN Mode release Return to Normal mode
DISP Display blinks once when key is pressed.
BAND Display blinks once when key is pressed.
SEARCH Display blinks once when key is pressed.
TEST MODE

13
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
●Tuner Test Mode Specification
The following display shall be indicated according to the TUNER status.
Status Display content Details
TUNER IC Normal Error TUN CON NG Communication to TUNER IC not available (indicated unless
the mode is in Clock Display Mode).
Adjustment not imple-
mented
∗ERR∗A97.9A
Blink in 2Hz
For models that TUNER adjustment is necessary but not done
(adjustment value: 0x00 or 0xFF), the following TUNER Test
Mode functions are valid (“∗ERR∗” display is continuing).
RDS Specified data
reception RDS TEST Turn OFF P-CON forcibly if PS=RDS TEST is received.
P-CON recovers with Power OFF/ON.
Operations
Operation Display content Details
ACCENT TUNER IC display
ATOM RDS Display TUNER IC version
BAND BAND switch
operation FM1 – 3 A 9 7.9 A Execute Band Switch as shown in the following table
every time Band key is pressed in each type.
SEARCH S meter voltage
judgment display
S–MTR xx:OK
S–MTR xx:NG
S–MTR xx:––
S meter value xx: Current S meter value
Determination result OK: Within S meter voltage spec
NG: Out of S meter voltage spec
– – : No LEVEL OFFSET adjustment
■DISP
Shift to TUNER
setting adjust-
ment mode
Shift to TUNER setting adjustment mode after switching
to 98.3MHz
SG setting values
Frequency: 98.3MHz, Modulation frequency: 1kHz,
Modulation mode: MONO, Modulation: OFF,
Deviation: 40kHz, ANT input level: 34dBμV
TUNER Setting Adjustment Mode
1) Operation (Operation after performance of above-mentioned “Shift to TUNER setting adjustment mode” item)
Operation Display content Details
■BAND
(Toggle)
AUTO Adjust-
ment Mode A S–xx L–xx
Select TUNER adjustment method (AUTO) using [BAND] key.
S-xx: Current S meter value (Hex)
L-xx: Level offset value (Hex)
✳In case that the level offset value is not adjusted (0xFF
or 0x00), display “– –”.
RETURN Mode release Return to TUNER Test Mode
2) Operation in AUTO Adjustment Mode
Operation Display content Details
VOL
PUSH Adjustment start A S–xx L–xx
Start adjustment (Start Auto adjustment, and transit to Suc-
cess/Failure display depending on the adjustment result)
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
3) Status display during adjustment
Status Display content Details
Adjustment success ADJ OK :x x When the adjustment value write-in to E2PROM (IC203 on X34)
has been completed. xx: Level offset value (HEX)
Adjustment failure ADJ NG When the adjustment value write-in to E2PROM (IC203 on X34)
has failed
4) Operation of return to TUNER Test Mode
Operation Display content Details
RETURN Mode release Return to TUNER Test Mode.
BAND switch list
Type BAND1 BAND2 BAND3 BAND4 BAND5 BAND6 Details
KqFM1 FM2 FM3 wAM - - q→w
EqFM1 FM2 FM3 wMW/LW - - q→w
MqFM1 FM2 FM3 wMW SW1 SW2 q→w
●CD Test Mode Specification
It shall be the same as normal RST start in other than the below setting.
Content Details
Playback track from top No.9
Default for Display mode Play time
Operations in CDDA playback
Operation Display content Details
Special track
up
Every time pressed, track up/down performed as below.
No.9→No.15→No.10→No.22→No.12→No.13→No.14→No.9
However, playback is from No.1 for discs with 8 tracks or
less.
If transferred to tracks other than the above with B. Skip,
up/down is performed 1 track at a time to the nearest track
Special track
down
3Special jump
operation
Jump to No.28
(Scratch 0.7mm for MUSIC line vibration test)
4Special jump
operation Jump to No.14 (Damaged disc TCD-731RA Tr14)
5Special jump
operation
Jump to No.15
• Set Volume value at 27 (2.5V PREOUT MODEL)
• Set Volume value at 29 (4V PREOUT MODEL)
(for error operation FCT check of 20Hz 0dB DC protection)
6Special jump
operation
Jump to No.9 if the track No.22 is playing.
Jump to No.22 if the track No.9 is playing.
●BT test mode specification (BT built-in model)
Initial condition of the BT MODE (BT source) will display as following.
Status Display content Details
BT MODE BT MODE BT MODE display
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Operations during BT MODE
Operation Display content Details
ACCENT Clear the BT MODE (BT source) and transition to the last
source. (Target model: BT)
■
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. (Target model: BT)
BT INIT :OK
BT I N I T :NG
This is to initialize the BT related memory to its factory de-
fault condition.
When the initialization is successfully completed, “…OK”
(upper) is displayed, and when the initialization is abnor-
mally completed, “…NG” (lower) is displayed.
(Target model: BT)
■
SEARCH
BT device
search
(The display blinks)
SEARCH I NG
Press and hold this key for 1 second to initiate the BT de-
vice search.
The search is terminated when 1 device is found.
(Target model: BT)
xxxxxxxxxxxxxWhen a device is found after the search, the name of that
device is displayed. (Target model: BT)
UNKNOWN
When no device is found at the completion of the search.
Only for this case, perform the search again by pressing the
[VOL PUSH] key briefly. (Target model: BT)
After the completion of the search, press and hold the
[BAND] key for 1 second to exit from the test mode.
(Target model: BT)
■BAND Internal loop
back ON *2
INT LOOP F
• Set the Volume to 22 and turn the internal loop back func-
tion ON by pressing and holding for 1 second.
• INT LOOP F: Display internal loop back by FRONT micro-
phone
• INT LOOP R: Display internal loop back by REAR micro-
phone
• Microphone setting initial value is FRONT for model with
microphone setting.
• Display microphone position for each model for model
without microphone setting.
• Details of display will not change except [F or R] if it is
ON.
+AM233 (Target model: BT)
INT LOOP R
Operations during internal loop back (only with KDC-BT648U)
Operation Display content Details
DISP
(Toggle)
Switch micro-
phone
INT LOOP R Microphone REAR setting
INT LOOP F Microphone FRONT setting
*1: This is a function to clear the BT memory information recorded in the EEPROM and the FLASH memory to be initialized with
the “Data flash clear” function, and to write the specific values to initialize it to its factory default condition.
Factory default condition
• Clearing of the pairing information (FLASH memory of the BT module)
• Clearing of the preset telephone numbers (EEPROM)
• Writing “KENWOOD BT CD/R-3P1” in the friendly name (FLASH memory of the BT module)
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
• Writing “0000” in the PIN code (FLASH memory of the BT module)
*2: Perform internal LOOP-BACK inspection to check the connection of the built-in microphone (component).
This mode is cleared by reset. (Last status is not retained.)
●Special display while the [ACCENT] key is pressed
SD built-in model
Operation Display content Details
[ACCENT] key No SD NO SD Display when SD is not inserted.
USB model (except BT built-in model)
Operation Display content Details
[ACCENT] key No iPod NO I POD Display when iPod is not inserted.
5. Service Test Mode
●How to enter the service test mode
While pressing [2] key, press and hold [6] key for 7 seconds in STANDBY source.
(It is not possible to enter the service test mode by pressing [2] key and [6] key simultaneously)
●Default status immediately after the mode activation
It shall be same as the normal activation.
●Mode structure
Service Test Mode can be executed independent of the current source.
●Mode content
Syscom shall display the following information after entering this mode. The operation shown below shall be workable.
Display content Details
SRV TEST The display is released when another operation is executed.
●Operation mode common to all sources
Operation Display content Details
1 (Toggle)
Development name
status display 1017WE –200Development name – Version (Micom)
BT module version
display BT Hxxx Sxxx.xBT module version display (Target model: BT)
BT module address BTAD xxxxxxxxBT module address display (Target model: BT)
BT module PIN
code PIN :xxxxxxxxBT module PIN code display (Target model: BT)
Information display
Mechanism model
name
Mechanism version
9B20: Mechanism model name and mechanism version
display
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Operation Display content Details
3Power ON duration
display
PONTM 0H x x
00~50 are displayed in “xx”.
For less than 1 hour, the display is indicated per 10
minutes.
PONTM xxxxx00001~10922 are displayed in “xxxxx”.
MAX 10922 (hours)
4Disc action duration
display
CDTM 0H x x
0~50 are displayed in “xx”.
For less than 1 hour, the display is indicated per 10
minutes.
CDTM xxxxx00001~10922 are displayed in “xxxxx”.
MAX 10922 (hours)
5Disc Eject number
of times display EJCNT xxxxxDisplay Disc Eject number of times.
MAX 65535 (times)
■5Disc Eject number
of times clear
Clear Disc Eject number of times by pressing for 2
seconds when it is displayed.
Forced Power OFF
information display
POFF ––– No forced Power OFF
POFF PNL Forced Power OFF due to Syscom-Panel communica-
tion error.
■Forced Power OFF
info clear
Clear forced Power OFF information by pressing for 2
seconds when it is displayed.
●CD Error Information Display Mode
Operation Display content Details
DISP CD error information
display mode Transit to CD error information display mode.
Move
between
BAND
(Forward
search)
items with
/
CD Mecha error log
display MECHA E R # :x x
Mecha error history 1,2,3 (latest)
#: History No. (1,2,3)
xx: numbers of errors, “--” when there is none
CD Load error info
display LOAD ER# :x x
Load error switch 1,2
#: Switch No. (1,2)
xx: numbers of errors, “--” when there is none
CD Eject error info
display EJECTER# :xx
Eject error switch 1,2,3,4
#: Switch No. (1,2,3,4)
xx: numbers of errors, “--” when there is none
CD time code error
count information
display (count skip)
CNT LOSE CD time code error count information (count skip)
mode display
CDDA :x x CD-DA error count numbers
xx: numbers of errors and “--” when there is none
CDROM :x x CD-ROM (compressed file) error count numbers
xx: numbers of errors and “--” when there is none
CD time code error
count information
display (no count
update)
CNT STAY CD time code error count information (count not up-
dated) mode display
CDDA :x x CD-DA error count numbers
xx: numbers of errors and “--” when there is none
CDROM :x x CD-ROM (compressed file) error count numbers
xx: numbers of errors and “--” when there is none
■DISP CD error information
clear CD error information all clear
DISP Mode release CD error information display mode release
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
6. Version Display Mode
●How to enter the version display mode
While pressing and holding [RETURN] key, press [DISP] key.
●Default condition when the mode is started
Same as normal start-up.
●Mode structure
Version display mode can be executed independent of the current source.
However, this mode is supported only on the model that supports the firmware update function.
●Mode content
After entering this mode, system μ-com will display the following information regardless of the status.
Display content Details
1011WE –200Development name – Version (Micom)
Display content Model Development name
1009WM –X.XXKDC-U4549 C-1009WM
1010WK –X.XXKDC-X395 C-1010WKB
1017WE –X.XXKDC-BT41U C-1017WE
1017WK –X.XXKDC-BT648U C-1017WK
1017WM –X.XXKDC-U549BT C-1017WM
1018WK –X.XXKDC-X695 C-1018W
1040WK –X.XXKDC-348U C-1040W
1043WE –X.XXKDC-4751SD C-1043WE
1043WM –X.XXKDC-U4549SD C-1043WM
7. DC Error Information Mode
●How to enter the DC error information mode
Press and hold [3] key and [6] key and reset.
●Default status immediately after the mode activation
It shall be same as normal activation.
●Mode structure
DC Error Info Mode is enabled regardless of current source.
●Mode content
Syscom shall display the following information after entering this mode. The operation shown below shall be workable.
Display content Details
DC ERR When DC error is detected (in case that one of capacitor leakage, wrong connection or
other detection is found)
DC OK When DC error is not detected (in case that none of capacitor leakage, wrong connec-
tion or other detection is not found)
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
●Mode operation specification
Operation Display content Details
1DC ERR1dis-
play
DC1 ERR When wrong connection & DC error in other detection
duration is detected
DC1 OK When wrong connection & DC error in other detection
duration is not detected
■1 DC ERR1 clear DC1 OK
Clear detection information when wrong connection & DC
error in other detection duration is displayed. (Clear data
flash)
2DC ERR2 dis-
play DC2 4 Display detecting number of times in capacitor leakage
detection duration (0~4)
■2 DC ERR2 clear DC2 0 Clear number of times for detection information in capaci-
tor leakage detection duration. (Clear data flash)
8. Forced Update Mode
●How to enter the forced update mode
Press and hold [1] key and [SEARCH] key and reset.
●Default status immediately after the mode activation
It shall be same as normal activation.
●Mode structure
Forced update mode can be executed independent of the current source.
●Mode content
After entering the mode, perform the normal SRC feed with the [SRC] key, or DISC insertion.
The display of the SRC switching 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”.
Display specification for this will be as following.
Display content Details
F/W UP MODE STANDBY condition in the forced update mode
FILE CHECK File Check display after SRC switching
READ I NG Display while Reading
NO F I L E Display when there is no update file
UPDAT I NG Display after confirming the existence of an update file, and updating (The display blinks)
COMPLETE V300Update completed (Version that was data written is displayed after completion)
UPDATE ERR Update error
TEST MODE

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KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
ELECTRIC UNIT
X34-696x-xx
(J76-0730-12)
IC801
IC603
IC301
IC601
IC602
IC
5
IC451
IC201
IC203
IC71
IC261
IC401
IC802
IC921
J701
J921
J601
J301
W551
CN301
S301
Q103
Q
Q705
Q706
Q703 Q704
Q51
D51
Q921
Q105
D305
D306
D307
D921
D922
Q701
Q702
D52
D403
D402
D401
D105
D701
D702
Q707
Q708
D308
D801
1
1
1
1
1
1
1
1
1
C809
C104
C10
3
R235
W62
R812
R813
R814
R221
C519
C813 C815
R406
R405
R236
R237
R116
R243
R244
R248
R247
R246
R720
R719
R350
R351
R409
R407
R408
C606
C414
C605
C74
C75
R613
R614
W46
C307
C207
W608
271
13
910 6 7 5 1
11 12 8 4 3 2
LX BUS
PRE OUT
MIC
LR
226
C73
C60
C309
C310
C411
C91
C94
R268
C301
R517
C302
R325
R326
R621
W
1
C410
C811
C412
W99
R345
R344
C805
L551
C603
L502
L503
L507
L504
L506
L508
L505
L501
X501
R11
R12
R815
R816
R818
R817
R615
W21
W22
W23
W30 W39 W53
C701
C702
C703
C704
C706
C705
R249
C210
C211
C212
C213
C214
C215
C216
C457
C921
R617
C105
C8
0
C401
C403
C409
C807
C806
C455
C456
C453
C408
C407
C406
C405
R206
R208
C101
C202
R107
R112
R11
4
R802
R805
R806
C71
C261
C917
C916
C54
R117
R458
R115
R401
R119
R459
R929
R217
R463
R821
R11
3
R809
R456
R
9
R317
R316
C55
C52
C58
C102
C106
C203
C822 C826
C828
R803
C458
R59
R71
R314
R262
R226
R230
R227
R703 R704 R709 R710 R715
R716
R804
R108
R261
R118
R619
R620
R216
R321
R322
R204
R220
R457
R239
R120
R240
R241
R266
R267
R327
R263
R801
R807
X201
R925
R926
R924
R923
R320
R207
R209
R308
R303
R307
R319
R318
C402
C404
C711 C712 C713 C714 C715
C716
L51
X202
L302
L52
L401/R411
L402/R412
L403/R413
R712
R711 R717
R718
R706
R705
R302
R304
30
29
2
1
1
2
23
RST 24
R309 R310
R313
R312
R311
R271
R225
R228
R222
R224
R233
R231
R229
R
9
R808
R205
R454
R223
R234
R954
R461
R460
R810
R403
R462
R57
R455
CP901
R822
R823
C217
C218
R335
L404/ R414
L405/
R415
C418
R336
R125
R124
7
14
8
4
58
16
17
32
64
49
48 33
4
58
45
8
8
5
610
16
20
11
15
8
16
9
144
36
108 73
109
37
72
1
34
5
BE
EBEB
EB
BE
BE
EB
BE
BE
EB
45
31
13
45
45
13 B
E
BE
BE
E
BE
ABCDE
1
2
3
4
5
6
7
PC BOARD (COMPONENT SIDE VIEW)