Kenwood KDC-3025, KDC-325, KDC-5026, KDC-5026-G Service manual
CD RECEIVER
KDC-3025/325/5026/G
SERVICE MANUAL
© 2003-11 PRINTED IN JAPAN
B53-0106-00 (N) 1029
KDC-5026/5026G
KDC-3025
KDC-325
Panel assy
(A64-3190-02):KDC-5026G
(A64-3191-02):KDC-5026
Panel assy
(A64-3183-02):KDC-325
(A64-3185-02):KDC-3025
CD MECHANISM EXTENSION CORD : W05-0618-00
DC cord
(E30-6322-05)
Escutcheon
(B07-3083-02):KDC-5026G
(B07-3098-02):KDC-325/5026
(B07-3100-02):KDC-3025
TDF PANEL INFORMATION
MODEL TDF PANEL No. TDF NAME
KDC-325 Y33-1930-60 TDF-43D
KRC-3025 Y33-1930-61 TDF-43DB
Plastic cabinet assy
(A02-1486-13)
Screw set
(N99-1719-05)
Mounting hardware assy
(J22-0011-03)
Screw set
(N99-1730-15)
MODEL TDF PANEL No. TDF NAME
KDC-5026 Y33-1930-63 TDF-5026
KRC-5026G Y33-1930-62 TDF-5026G
Remote controller assy (RC-505)
(A70-2040-05)
Except KDC-5026G
Lever
(D10-4589-04)
SIZE AA BATTERY
x2
2
Q201
BUFFER
IC1
IC2
REMOCON
RESET SW
ENCODER
ROTARY
S1
WITH
LCD DRIVER
KEY MATRIX
IC1
LCD
PANEL DET
S1
EJECT SW
S1
EJECT ILLUMI
DSI
u-COM
IC2
MPX
E-VOL
&
ACC DET
TEL MUTE
B.U DET
PRE MUTE
DRIVER
MUTE
IC6
POWER
IC
IC4
THERMAL
PROTECT
ACC
TEL MUTE
BACK UP
(REAR)
PRE OUT
(FRONT)
PRE OUT
SP OUT
SURGE DET
SERVOSERVO+B
SW 14V
Q21
WIRED REMO
SUPPLY
IC
IC3
POWER
ANT CON
P CON
RESET
IC8
SW 5V
Q4
PANEL 5V
Q152
SW5V
ILLUMI CON
DRIVER
MUTE
PRE MUTE
KDC-3025 only
S-METER
AUDIO OUT
IFC OUT
PLL-DATA
PLL-CLK
SW5V
AM+B
A8V
LOE/LIM SW
12EJE SW
LOS SW
MS CLK
MS DATA
M MUTE
LO/EJ
M STOP
MOSW
M RST
SERVO+B
A8V
BU5V
LX-DATA C
LX-MUTE
LX-REQ H
LX-REQ C
LX-CLK
LX-CON
LX-DATA H
BACK UP
NOISE
S-METER
FM
AM
MP IN
LEVEL
CD
QUAL
AFS
CH
BU5V
PANEL DET
EJECT
DSI
L CLK
L DATAS
L CE
L DATAL
VOLUME A
VOLUME B
REMO
ILL CON
MUTE
P-MUTE
PHONE
ACC DET
B.U DET
BEEP
PS1-0
PS1-1
PS1-2
PS2-0
PS2-2
RST
BU5V
BACK UP
A8V
SW5V
BACK UP
AM+B
ILLUMI
A8V
BU5V
BU5V
BU5V
MODE
CD
FM
AM
CH
LEVEL
3600mV
1800mV
600mV
3600mV
LX-RST
REAR
FRONT
TUNER
CD
CH
SWITCH UNIT (X16- )
DAUGHTER UNIT
(X89- )
KDC-3025/325/5026/G
BLOCK DIAGRAM
KDC-3025/325/5026/G
DISASSEMBLY FOR REPAIR
How to Disassemble (PANEL ASSY)
1)Remove four screws (A).
2)While holding the section (B) indicated with arrows, pull and
remove PANEL ASSY.
x2
A
A
B
B
How to install knob (SRC)
1)Place knob (F) and knob (G) in the positions indicated in
the diagram below.
2)While keeping these positions, use a piece of adhesive tape
(H) to hold knobs in position, as shown in the diagarma.
3)Set the rotary (J) position as shown in the diagram.
4) While keeping the letters “SRC” horiz ontally in position, set
it to the rotary on the panel.
5)Remove the adhesive tape (H).
x2
F
G
H
B
3) Pull SWITCH UNIT (C) as indicated in the diagram and remove knob (D).
(The knob (D) is attached to the rotary with hook (E) and it
is not possible to remove hook (D) only.)
C
B
D
E
J
3
KDC-3025/325/5026/G
COMPONENTS DESCRIPTION
● SWITCH UNIT (X16-2500-xx)
Ref. No. Application/Function Operation/Condition/Compatibility
IC1 LCD Driver Drives LCD
IC2 Remote Control IC Controls the unit.
Q1,Q4 REMO ON SW The power supply of IC2 is turned on when base level goes “L”.
● ELECTRIC UNIT (X34-3090-xx)
Ref. No. Application/Function Operation/Condition/Compatibility
IC1 System µ-COM Controls FM/AM tuner, the changer, CD mechanism, Panel, volume, and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.
Bu5V (5V) Audio8V (8V) FM+B (8V)
AM+B (8V) P-CON ANT-CON
SW1 OUT
1.5~3.0 Audio ON
IC3 Power Supply IC
3.5~5.0 Audio P-CON ON
7.0~ Audio P-CON P-ANT ON
SW2
2.0~3.0 ILLUMI FM ON
4.0~ ILLUMI AM ON
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC6 Muting logic IC Controls logic for muting.
IC8 Reset IC “L” when detection voltage goes below 3.5V or less.
Q1 Surge Detection
Q2 BACK-UP Detection “L” when B.u is present. “H” when B.u is absent or momentary power down is detected.
Q3 ACC Detection “L” when Acc is present.
Q4 SW 5V ON when the base is “L”.
Q21 Servo Regurator
Q22 Servo SW
Q23 Conrtol Power Supply IC
Q151 DSI Driver DSI turns off when the base is “H”.
Q152 Panel 5V SW
Q153,Q154 ILLUMI Control ILLUMI lights when the base of Q153 is “H”.
Q201 Noise buffer
Q351 Pre Mute SW Mutes the Rear Lch when the base is “H”.
Q352 Pre Mute SW Mutes the Rear Rch when the base is “H”.
Q354 Pre Mute SW Drives the Pre Mute sw (Q351, 352, 355, 356) when the base is “L”.
Q355 Pre Mute SW Mutes the Front Lch when the base is “H”.
Q356 Pre Mute SW Mutes the Front Rch when the base is “H”.
“L” when the back-up voltage becomes more than 24V (momentary power down).
“H” when the back-up voltage becomes less than 24V.
DSI lights when the base is “L”.
DSI turns on and off when panel is taken off.
When the panel is attached, the base goes “L”, turning the Tr ON to supply 5V to the panel.
When panel is taken off, panel 5Vcut off.
4
KDC-3025/325/5026/G
MICROCOMPUTER’S TERMINAL DESCRIPTION
● SYSTEM MICROCOMPUTER : M30302MC-1N4FP (X34 : IC1)
Pin No. Pin Name I/O Application
1~5 N.C O OPEN (Output L fixed)
6 REMO I Remote control input
7 N.C O OPEN (Output L fixed)
8 BYTE I External data bus width switching input Connect to GND
9 CNVSS I Pull down at 1kΩ
10 XCIN I Sub clock input
11 XCOUT O Sub clock output
12 RESET I Reset input Normal : H, When RESET : L
13 XOUT O Main clock output
14 VSS - GND
15 XIN I Main clock input
16 VCC - Power supply input (5V)
17 NMI Pull up (B.U5V)
18 EJECT I EJECT detection input L : EJECT
19 N.C O OPEN (Output L fixed) (Other than RDS model)
20 LX-REQ S I Reception request from external slave L : Request
21 ILL CON O Illumination output control FLIP DET “L” during “H”
22 PANEL 5V I/O Panel 5V control
23 VOL A I VOL key input
24 VOL B I VOL key input
25
LOE/LIM SW (SW3)
26 BEEP O BEEP output
27 M STOP O STOP request to CD mechanism When CD : H, When STOP : L
28 MOSW O CD mechanism MOTOR SW LOADING, EJECT, Brake : H
29 PLL-CLK I/O Clock output to F/E
30 PLL-DATA I/O Data input/output with F/E
31 LX-DATA M O Data output to external slave Last retention
32 LX-DATA S I Data input from external slave
33 LX-CLK I/O Clock input and output of external slave
34 LX-REQ M O Transmission request to external slave At request : L
35 L DATAS O Data output to LCD driver
36 L DATAL I Data input from LCD driver
37 L CLK I/O Clock output to LCD driver
38 FLIP-DET I Panel collapse detection L : Panel received, H : Panel collapse
39 L CE O CE output to LCD driver
40 LO/EJ I/O CD mechanism LOADING, EJECT switching
41 EPM I For flush writing Pull down at 100kΩ
I CD DOWN SW detection H : Chucking
Truth Value
Table
Processing Operation Description
L : ON (Panel detect & ACC ON)
Hi-Z : OFF (Panel no detect or ACC OFF)
STOP, Brake : Hi-z
LOADING : L, EJECT : H
5
KDC-3025/325/5026/G
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
42 M RST O RESET output to CD mechanism Normal : H, When RESET : L
43 M-MUTE R I MUTE request (Rch) from CD mechanism L : MUTE ON
44 12EJE SW (SW2) I 12cm DISC detection input L : 12cm disk
45 M-MUTE L I MUTE request (Lch) from CD mechanism L : MUTE ON
46 LX-CON O External slave selection ON : H, OFF : L
47 LO.S SW (SW1) I LOADING SW detection input L : LOADING START
48 DSI O EJECT key, DSI, guide ILLUMI output ILLUMI ON : L, ILLUMI OFF : H
49 PANEL-DET I Detection for panel or no panel H : Panel detect, L : Panel no detect
50 N.C O OPEN (Output L fixed)
51 IFC OUT I F/E IFC OUT input H : Station detect
52,53 N.C O OPEN (Output L fixed) (Other than RDS model)
54 N.C OPEN (Output L fixed)
55 AFS O Constant switch terminal at noise detection
56 SDA I/O Data input/output to IC2, CD mechanism
57 SCL I/O CLK output to IC2, CD mechanism
58 MUTE O IC2 MUTE control MUTE ON : H, MUTE OFF : L
59 N.C OPEN (Output L fixed)
60 IC2 TYPE 0 I
61 IC2 TYPE 1 I
62 VCC Power supply input (5V)
63 N.C O OPEN (Output L fixed)
64 VSS GND
65~67 TYPE 0~TYPE 2 I Destination switching port e
68 N.C O OPEN (Output L fixed)
69 SVR O Power IC SVR control Momentary power dropped : H
70 P-STBY O Power IC STBY control
71 P-MUTE O Power IC MUTE control
72 SW5V I/O SW5V control ON : L, OFF : Hi-z
73 B.U-DET I Momentary power dropped detection input L : B.U detect, H : B.U no detect
74 ACC-DET I Acc detection input L : Acc detect, H : Acc no detect
75 N.C O OPEN (Output L fixed)
76~78 PS1-0~PS1-2 O Power supply IC control terminal q
79,80 PS2-0~PS2-1 O Power supply IC control terminal w
81 LX-MUTE I MUTE request from external slave H : MUTE ON, L : MUTE OFF
Third party/genuine switching 0
(ROLL-OFF)
Third party/ genuine swithcing1
(NOISE-CANCEL)
Truth V alue
Table
Processing Operation Description
During FM seek, AF search : L
When receiving : H
L : Third party, H : Genuine
L : Third party, H : Genuine
POWER IC ON : H, OFF : L
ALL OFF during : L
When POWER OFF : L, When ALL OFF : L
When TEL MUTE : L
6
KDC-3025/325/5026/G
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
82~88 N.C O OPEN (Output L fixed)
89 KEY-REQ I Communication request from LCD driver L : Key input detect
90~92 N.C O OPEN (Output L fixed)
93 S-METER I S-meter voltage input
94 NOISE I FM noise detection
95 N.C O OPEN (Output L fixed)
96 AVSS - GND
97 N.C O OPEN (Output L fixed)
98 VREF I Reference voltage input Connect to 100 pin
99 AVCC - 5V
100 REFCON O VREF control While power ON : H
Truth Value
Table
Processing Operation Description
Truth Value Table q
PS1-0 PS1-1 PS1-2 AUDIO P-CON P-ANT
LLLOFFOFF OFF
H (L) L (H) L ON OFF OFF
HHLONONOFF
HHHONON ON
Truth Value Table w
PS2-0 PS2-1 ILLUMI FM+B AM+B
LLOFF OFF OFF
H(L) L(H) ON ON OFF
HHONOFF ON
Truth Value Table e
MODEL DESTINATION
KDC-5027 E L L H
KDC-5027Y E2 L L H
KDC-508 E L L H
KDC-3025 K H L H
KDC-325 K H L H
KDC-5026 M (K) H H H
KDC-5026G M (K) H H H
012
TYPE
7
KDC-3025/325/5026/G
TEST MODE
1. How to enter the test mode
• While holding the Preset 1 and Preset 3 keys, reset the unit.
2. How to exit from the test mode
• Reset the unit, momentary power down, ACC OFF, power
OFF, and Panel detached.
•(Note) The test mode cannot terminated by Panel is fall
down.
3. Initial status in the test mode
• Sources : All OFF.
•Display :All segments are lit.
•Volume :-10 dB (displayed as 30)
• Loudness :OFF
• CRSC : OFF regardless of the presence of
switching function.
• SYSTEM Q :Flat.
• BEEP : When pressing any keys, the buzzer
generates a beep at any time.
• DISPLAY TYPE:TYPE A
4. RDS automatic measurement
• An addition to disposal of substitute for visual check PS
display as usual production lines.
• P-CON ter minal is OFF by force, when received the PS
data and in case of corrobaration PS display is
“RDS_TEST”. (“_” is mean blank.)
• This disposal is test mode only.
• P-CON is switching the source or return with power on→off.
5. Special display in Tuner mode
When any of the following messages is displayed in Tuner
mode, the front end may be abnormal.
• “TNE 2P NG”: The EEPROM is set to the default (unstable
values) because the F/E was shipped without passing
through the adjustment process, etc.
• “TNCON NG”: Communication with the F/E is not possib le.
7.CD Receiver Test Mode Specification
• When resetting to start, forced ejection of CD is prohibited. When a CD is in place , the CD is not recognized when
reset.
• When this key is pressed, the mechanism jumps to
the following trac k.
No9 → No15 → No10 → No11 → No12 → No13 →
No22 → No14 → No9 (Return to the first track.)
• When this key is pressed, the tr ac k goes do wn b y one
from the currently played track.
•When a CD being played, by pressing [1] key intermittently,
the mechanism can be made to jump to Track No. 28.
8. Audio-related specifications
•A short press of the Q key initiates the audio adjustment
mode.
• Pressing the ✽ key on the remote initiates the audio
adjustment mode.
•Fader is selected to the initial item.
• Continuous holding of a remote control key is inhibited.
• Bass, Middle and Treble are adjusted in 3 steps of -8/0/+8
with the Track Up/Down keys.
• Balance is adjusted in 3 steps of L15/0/R15 with the Track
Up/Down keys.
•Fader is adjusted in 3 steps of F15/0/R15 with the Track
Up/Down keys.
•Volume Offset is adjusted in 2 steps of -8/0 with theTrack
Up/Down keys.
9. Menu-related specifications
•A short press of the MENU key initiates the Menu mode.
Except, tape source is usually press and hold 1 second to
enter the menu mode and short press initiates turn over.
• Pressing the DNPP/SBF key on the remote initiates the
Menu mode.
• Continuous holding of a remote control key is inhibited.
• Contrast is adjusted in 3 steps of 0/5/10 (5x7dot), 0/4/7
(14seg) with the Track Up/Down keys.
6. Forced switching of K3I
• Each press of the Preset 6 key in Tuner mode should switch
K3I from AUT O → Forced Wide → Forced Middle → Forced
Narrow → AUTO. The initial status is AUTO and the display shows these modes as follows.
•AUTO:FMA
•Forced Wide :FMW
•Forced Middle : FMM
•Forced Narrow :FMN
8
10. Backup current measurement
•When the unit is reset while ACC is OFF (i.e. by turning
Back-Up ON), the MUTE terminal goes OFF in 2 seconds
in place of 15 second.
TEST MODE
KDC-3025/325/5026/G
11. Special display when the display is All ON
Pressing the Preset keys while the power is All OFF displays the following information.
[14seg 8 digits]
1key Version displa y (8 digits, Month/Da y/Hour/Minute)
(Display) xxxxxxxx
2key
3key Short press: View power ON time. (The All OFF
period is not counted.)
Long press/hold: Clear power ON time.
(Display) PONxxxxx Max. 65535 (hours)
4key Short press: Display TAPE operation time.
Long press/hold: Clear TAPE operation time.
(Display) TPTxxxxx Max. 65535 (hours)
5key Short press: Display TAPE ejection count.
Long press/hold: Clear TAPE ejection count.
(Display) EJCxxxxx Max. 65535 (times)
6key Short press: Display Panel open/close count.
Long press/hold: Clear Panel open/close count.
(Display) PCxxxxx Max. 655359 (times)
FM key Display ROM colection version
(Display) ROM Rxxx Invalid :ROM R–
[15x7dot 12 digits]
1key Version displa y (8 digits, Month/Da y/Hour/Minute)
(Display) SYS_xxxxxxxx
2key
3key Short press: View power ON time. (The All OFF
period is not counted.)
Long press/hold: Clear power ON time.
(Display) PonTim_xxxxx Max. 65535 (hours)
4key Short press: Display TAPE operation time.
Long press/hold: Clear TAPE operation time.
(Display) TPTim_xxxxx Max. 65535 (hours)
5key Short press: Display TAPE ejection count.
Long press/hold: Clear TAPE ejection count.
(Display) EjeCnt_xxxxx Max. 65535(times)
6key Short press: Display Panel open/close count.
Long press/hold: Clear Panel open/close count.
(Display) PnCnt_xxxxxx Max. 655359 (times)
FM key Display ROM colection version
(Display) ROM Rxxx Invalid: ROM R–
12. Other specifications
• The line mute against times are 1 second from 10 seconds when starting the test mode.
■ Security
• Forced Power ON mode (All models)
Even when the security is approved, resetting the unit while
holding the Q and 4 keys makes it possible to tur n the
power ON for 30 minutes .After 30 minutes ha ve elapsed, it
is not possible to return to the previous condition unless
the unit is reset again.
• Method of registration of the security code after
EEPROM (F/E) replacement (Code security model)
1. Enter the test mode. (See How to enter the test mode)
2. Press the MENU key to enter the MENU.
3. When the message “Security” is displayed, press and
hold the Track Up/Down key for 1second to enter the
Security registration mode.
4. Enter the code using the FM/AM/Track Down keys.
• FM key : Number up
• AM key : Number down
•Track Up key : Cursor right shift
•Track Down key : Cursor left shift
5. Hold down the Track Up key for at least 3 seconds and
the message, “RE-ENTER” appears , so once again enter the code according to Step 4 above.
6. Press and hold the T r ack Up k e y for 3 seconds until “AP-
PROVED” is displayed.
7. Exit from the test mode. (See 2 How to exit from the test
mode)
(Note) All Clear is not applicable to the security code of
this model.
• Simplified method of clearing the security code
1. While the code entry is requested, press and hold the
Track Up key for 3 seconds while holding the AUTO k e y
pressed. (----will dissappear.)
2. Enter “KCAR” from the remote.
•Press the 5 key on the remote twice, then press the
Track Up key. (This enters “K”)
•Press the 2 key on the remote 3 times, then press the
Track Up key. (This enters “C”)
• Press the 2 key on the remote once, then press the
Track Up key. (This enters “A”)
•Press the 7 key on the remote twice, then press the
Track Up key. (This enters “R”)
3. Security function is canceled and the unit enters the All
OFF mode.
4. If you commit a mistake in the code entry, the unit enters the code request mode.
9
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