Kenwood KDC-208U User manual

This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
SERVICE MANUAL
KDC-208U/248U/4051UGM/4051URM
KDC-MP148U/MP248U/U3049
KDC-U349A/U349G/U349R/U349S
KDC-U4049
CD RECEIVER
© 2010-12 PRINTED IN JAPAN
B53-0833-00 (N)217
TDF SPARE-PANEL
MAIN UNIT NAME TDF PARTS No. TDF NAME
KDC-208U Y33-3390-11 TDF-120D
KDC-248U Y33-3380-10 TDF-128D
KDC-4051UGM Y33-3400-26 TDF-4051UGM
KDC-4051URM
KDC-MP148U Y33-3390-10 TDF-MP11DU
KDC-MP248U Y33-3380-11 TDF-MP12DU
KDC-U3049 Y33-3400-20 TDF-U3049
KDC-U349A Y33-3400-24 TDF-U349A
KDC-U349G Y33-3400-23 TDF-U349G
KDC-U349R Y33-3400-21 TDF-U349R
KDC-U349S Y33-3400-22 TDF-U349S
KDC-MP248U : Panel assy (GE20277-017A)
KDC-248U : Panel assy (GE20280-020A)
KDC-U349A/G/R : Panel assy (GE20277-019A)
KDC-U349S : Panel assy (GE20277-006A)
Y33-3400-25 TDF-4051URM
KDC-U4049 Y33-3403-01 TDF-U4049
KDC-U4049 : Panel assy (GE20280-019A)
After replacing E2PROM (IC771 on X34), tuner setting adjustment is needed.
The adjustment is that to perform the “TUNER Setting Adjustment Mode” (Page 5)
in the “Tuner Test Mode Specification” of “Production Test Mode”.
Tuner setting adjustment after replacing E2PROM
Mounting sleeve assy
(GE34134-001A)
Hook
(GE40510-001A) x2
* Car cable
(E30-xxxx-xx)
* Screw set
(N99-1757-15)
* Carrying case
(W01-1710-05)
* Car cable
(E30-6937-05)
* Tap screw (2x8)
(N80-2008-43)
* Hard case assy
(A02-2757-13)
* Remote control unit (RC-405)
(A70-2104-05)
Trim plate
(GE20274-001A)
KDC-4051UxM : Panel assy (GE20280-012A)
KDC-MP148U : Panel assy (GE20280-002A)
KDC-U349
KDC-MP248U
KDC-MP148U
KDC-248U
KDC-U4049
* Depends on the model. Refer to the parts list.
KDC-4051UM

2
KDC-208U/248U/4051UGM/4051URM/MP148U/MP248U KDC-U3049/U349A/U349G/U349R/U349S/U4049
BLOCK DIAGRAM
1
BU DET
PHONE
RESET
9
5
9
BU DET
1
2
MUTE
R902,903
12
2
1
1
111
∗R631,632
D891
2
FL+B
PS1-1 / PS1-2 / PS1-3
ACC5V / BU-DET
PS2-1 / PS2-2
PHONE
PS1-1 / PS1-2 / PS1-3
PS2-1 / PS2-2 P-ANT
P-CON
SP-OUT
PHONE
ACC
BU
5
SW3.3V
SW3.3V
PON-FL
1
8
ACC5V
PANEL3.3V
CD1.5V CD3.3V
22
FL+B
3
2
2
FL+B
E-VOL
IC161
A9V
SYSTEM u-COM & USB HOST
∗Q321,341
PHONE
Q970
BU DET
Q971
SW 3.3V
Q951,952
IC501 AUDIO
CD
BU5V
SW5
(REMO DRV)
RESET IC
IC702
ILLUMI+B
CONNECTOR
RESET SW
REMO
FL
IC701
IC301
IC602
CN901
ILLUMI+B
EN601 FL601
∗J321
MUTE
∗Q780
IC1
Q701
VDD3.3V
to GND
S701
CN601
A9V
ANT
E2PROM
BU3.3V
F-AUX
J602
PANEL DET
IC901
CN701
SW3.3V
IC771
TUNER
ROTARY
ENCODER
KEY
ILLUMI
(FL FILAMENT)
RESISTOR
KEY
MATRIX
LOAD
RESISTOR
MOTOR
DRIVER
IC
SUPPLY
POWER
DC-CN etc
MUTE
RCA
AMP
POWER
RCA-OUT
DET
SURGE-
DC-CN
BU5V
SERVO IC
(OASIS)
IC540
CD 3.3V
CD 1.5V
IC530-532
BU
BU3.3V
ATOMIC
(OE REMOTE)
EXT REMO MECHA
CD CD3.3V
to MECHA
J1
BU3.3V
to DC
CONNECTOR
PANEL3.3V
CD
BU3.3V
BU5V
LOAD
SW3.3V
IC931
BU3.3V
SW 3.3V BU5V
PANEL SW3.3
Q602
BU3.3V
BU5V
USB5V
CP
i-Pod
IC80
SW3.3V
SW
HI-SIDE
USB5V
(DC/DC)
IC981
IC961
USB5V
USB CN
CN603
ELECTRIC UNIT (X34- )
SWITCH UNIT (X16- )

3
KDC-208U/248U/4051UGM/4051URM/MP148U/MP248U
KDC-U3049/U349A/U349G/U349R/U349S/U4049
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)
DC Error Information Mode Press and hold [3] key and [6] key and reset.
✳Transition to Test Mode shall be available during DC Error detection.
3. How to release each Test Mode
• Reset
• Momentary voltage drop
• ACC OFF
• POWER OFF
• Panel Detach
4. Production Test Mode
●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
Mecha Initialize Action 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
BEEP sound Beep with short-pressing in any functions
Various setting value
Volume 30 (-10dB)
BASS BOOST/LOUD OFF
EQ NATURAL
Fader/Balance Center
DEMO Mode Setting OFF
AUX Setting ON1
NAVI MUTE Setting for Japan Detecting function valid (ATT)
TEST MODE

4
KDC-208U/248U/4051UGM/4051URM/MP148U/MP248U
KDC-U3049/U349A/U349G/U349R/U349S/U4049
●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
USB -
AUX -
●Mode content
Syscon shall display the following information after entering this mode. The operation shown below shall be workable.
Display content Details
PRO TEST The display is released when another operation is executed.
The display will blink if sub clock is not functioning.
●STANDBY Test Mode Specification
Operation Display content Details
1 (Toggle)
Syscom version display SYS0∗–∗∗∗ Syscom version (Refer to Syscom Version Table)
All lights ON All lights ON (Switch with other display)
2 (Toggle)
Serial No. display SN 00000000 Serial 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)
Information display iPod
verification IC mount sta-
tus 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 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
6 FL display short check
All lights ON →All lights OFF →odd terminal and
even terminal of the largest grid ON alternatively
every 125ms →odd terminal ON →even terminal
ON →(repeat continuously)
SOURCE
transition Mode release Return to Normal mode
■RETURN Mode release Return to Normal mode
●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).
TEST MODE

5
KDC-208U/248U/4051UGM/4051URM/MP148U/MP248U
KDC-U3049/U349A/U349G/U349R/U349S/U4049
Status Display content Details
Adjustment not imple-
mented ∗ERR∗A97.9A
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).
Display “∗ERR∗” blinks with 250ms interval.
RDS Specified data re-
ception RDS T EST 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 mode
Shift to TUNER setting 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 mode” item)
Operation Display content Details
■BAND
(Toggle)
AUTO Adjustment
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 “– –”.
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)
3. Status display during adjustment
Status Display content Details
Adjustment success ADJ OK :x x
When the adjustment value write-in to E2PROM (IC771 on X34) has
been completed.
xx: Level offset value (HEX)
Adjustment failure ADJ NG When the adjustment value write-in to E2PROM (IC771 on X34) has
failed
4. Operation of return to TUNER Test Mode
Operation Display content Details
RETURN Mode release Return to TUNER Test Mode.
TEST MODE