© 2003-11 PRINTED IN JAPAN
B53-0102-00 (N) 1029
CD RECEIVER
KDC-105
KDC-126/126S
SERVICE MANUAL
CD mechanism extension cord (22PIN) : W05-0618-00
AUTO
CLK
ADJ
SCAN
AUD
RDM
REP
OFF
LOU
D
AME
CRSC
AUTO
CLK
ADJ
SCAN
AUD
RDM
REP
OFF
LOU
D
AME
CRSC
Escutcheon
KDC-105
(B07-3097-02)
KDC-126
(B07-3001-02)
KDC-126S (B07-3098-02)
Mounting hardware assy
(J21-9716-03)
Lever
(D10-4589-04) x 2
DC cord
(E30-6322-05)
(E30-6323-05)
Screw set
(N99-1719-05)
Front glass
KDC-105 (B10-4445-01)
Panel assy
KDC-105 (A64-3151-02)
Front glass
KDC-126 (B10-4446-01)
KDC-126S (B10-4448-01)
Panel assy
KDC-126
(A64-3152-02)
KDC-126S (A64-3154-02)
2
KDC-
105,1
26/1
26S
BLOCK
DIA
GRAM
S1(LOS SW)
S2(12EJE SW)
(LOE & LIM SW)
S4(8EJE SW)
LPF
LPF
IC1
MECHANISM
CONTROL IC
S3
5V SW
Q2
3.3V AVR
IC2
IC3
DSP/DAC IC
CD RF/SERVO/
Q3
APC
Q4
SW
IC4
4ch BTL
DRIVER
LD
PD
C
F
AB
E
TR COIL
FO COIL
M
M
DM1
DM2
SPINDLE
MOTOR
LOADING
MOTOR
& SLED
OPTICAL PICKUP
DPU1 :
BU5V 15
DGND 14
DATA
CLK
18
19
MUTER
MUTEL 12
13
MSTOP
MRST 11
10
LOS SW 20
21
SW
1
8EJE SW 17
A8V 9
Lch 8
AGND 7
DOUT
Rch
22
6
4
MOTOR
LO/EJ 5
SGND
S7.5V 3
2
NC 16
12EJE SW
MST
OP
D
ATA
MRST
MUTEL
MUTER
CLK
PON
SERCH
LOE&LIM
LOE & LIM
SW
PON
INTQ
SI
AO
DSP RESET
STB
SCK
DRV MUTE
SO
CNTL
RST
SI
SCK
STB
AO
INTQ
SO
MD+
SD+
TD+
FD+
LZM
RZM
R
OUT
LOUT
TX
X1
4.19MHz
Z
MUTE
L
Z
MUTE
R
16.934MHz
X2
A
B
C
D
E
PRE OUT
F
LD
PD
FDIN-
BIAS
CNT
TR+
TR-
FO-
FO+
SLD+
SLD-
SPD-
SPD+
TDIN-
SPIN-
SLIN+
MUTE
LO/EJ
OPEN
OPEN
BU5V
SW5V
SW3.3V
S7.5V
VREF
CD PLAYER UNIT (X32-5490-00)
3
KDC-
105,1
26/1
26S
1200mV
1200mV
CD : 3600mV
CH : 3600mV
AM(E) : 855mV
FM(E) : 1372mV
FM(J,K) : 1800mV
AM(J,K) : 600mV
CHANGER
KEY MATRIX
WITH
LCD DRIVER
LCD
REMOCON
MI-COM
CD
ANT
AM AGC
FM AGC
RESET
IC
EEP-ROM
TUNER,MPX &
E-VOL.
SUPPLY IC
SW5V
SERVO
P-ANT
P-CON
POWER
MUTE
LOGIC
DET
ACC
BU
DET
MUTE
PRE
POWER IC
SP
ACC
UP
BACK
OUT
OUT
PRE
IC1
DATA H
MUTE
DATA C
REQ H
CH-CON
AUDIO OUT
CLK
REQ C
RST
BACK UP
BU5V
IC2
SW5V
LO/S
RST
LOE/LIM
MO
LO/EJ
STOP
MUTE
8EJE
SDA
SCLK
AUDIO OUT
12EJE
Q501
Q502
AM+B
FM+B
AM AGC OUT
CH
CD
SERVO
BU5V
A8V
TUNER
OUT
BU5V
IC11
IC12
IC10
FM AGC OUT
A8V
SW2
SW1
ILLUMI
VCC
BU5V
AUDIO+B
AM+B
FM+B
BA
CK
LIGHT
KEY
ILLUMI
Q51,55
SW5V
Q50
SERVO
BU5V
FM+B
AM+B
A8V
P-CON
P-ANT
IC8
Q20
Q10
IC7
MUTE
Q223,224
IC4
ELECTRIC UNIT (X34- )
SWITCH UNIT (X16- )
BLOCK
DIA
GRAM
4
KDC-105,126/126S
COMPONENTS DESCRIPTION
SWITCH UNIT (X16-2470-xx)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
LCD driver
LCD derive & Key input interface
Q1
Key scan detect
key scan start at base gose "L".
CD PLAYER UNIT (X32-5490-00)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
Mechanism control
When BU5V & MSTOP (12pin) goes "H" (IC1 is active)
IC2
SW3.3V AVR
When CNTL (1pin) goes "H" (SW3.3V AVR : ON)
IC3
CD DSP & servo IC
CD RF amp, Servo, DSP & DAC
IC4
BTL driver
Focus, tracking coil, Sled & Spindle motor driver IC
Q2
SW
SW5V SW transistor
Q3
APC
Auto Power Control
Q4
SW
EQ SW transistor
ELECTRIC UNIT (X34-3110-xx)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
System control IC
System control microprocessor
IC4
Audio power IC
Audio power amplifier
IC7
Power supply IC
Multi AVR IC (for 5V, 8V, P-CON & P-ANT)
IC8
Muting logic IC
Control for MUTE, P-ANT & RESET muting
IC10
E-VOL & tuner IC
E-VOL. FM/AM tuner & stereo decoder
IC11
Reset IC
When BU5V line voltage is less than 3.5V, this IC output line is "L"
IC12
E2PROM
Memorized tuner adjustment data (save & load)
Q10
BU detector
When the base goes "H" during BU applied (ON)
Q20
ACC detector
When the base goes "H" during ACC applied (ON)
Q40
Muting driver foe Q223, 224
When the base goes "L" (Muting : ON)
Q50
SW5V
When the base goes "L" (SW5V : ON)
Q51
SW
Control SW for IC7
Q53
Control SW for SERVO +B
When the base goes "H" (Servo +B : ON)
Q55
SERVO +B AVR
Servo AVR (7.4V)
Q70
Serge detector
When the base goes "H" (Serge detection)
Q223,224
Preout muting SW
When the base goes "H" (Preout muting : ON)
Q251
SW
When the base goes "L" (IC4 : ON)
Q501
AM RF amplifier
When the base goes "H" (RF circuit gain is up)
Q502
FM RF amplifier
When the base goes "H" (RF circuit gain is up)
5
KDC-105,126/126S
MICROCOMPUTER'S TERMINAL DESCRIPTION
SYSTEM MICROCOMPUTER : UPD780058GC556 (X34 : IC1)
Pin No.
Name
I/O
Description
Processing Operation
1PANEL
I
Panel detection
H : Panel detached, L : Panel attached
2
8EJE SW
I
H : Eject is completed
Except 8cm CD model : Always output L
3NCO
Not used (out put L)
4Avss
H : Panel detached, L : RESET
5
L-RST
O
LCD driver RESET
Normal H, Power off L
When 7seg model, output L
6
L-CE
O
LCD driver selection
H : Select (panel communication)
When panel attached, output L
7AVREF1
8NC
Not used (connected to 9pin)
9
IC10-DATA
I/O
IC10, E2PROM data communication
Non communication : H
10
IC10-CLK
O
IC10, E2PROM clock communication
Non communication : H
Non communication : H
11
L-DATAL
I
Data input from the LCD driver
When panel detached : L
Pull down on X34 unit, Pull up on X16 unit
12
L-DATAS
O
Data output to the LCD driver
When panel detached, output L
13
L-CLK
O
Clock output to the LCD driver
When panel detached, output L
14
R-DATA
I
Data input from the RDS
Except RDS model : Output L
15
R-QUAL
I
Quality input from the RDS
Except RDS model : Output L
16
CH-DATAC
I
Data input from the changer (new 5L)
Except changer model : Output L
17
CH-DATAH
O
Data output to the changer (new 5L)
When non communication, last data keeping
Except changer model : Output L
18
CH-CLK
I/O
Clock input/output with the Changer (new 5L)
Check the old and new
Except changer model : Output L
19
CH-REQH
O
Request output to the changer (new 5L)
L : Requset
Except changer model : Output L
20
NC
O
Not used (output L)
21
AFS
O
Noise detection time constant switching terminal
H : Normal, L : FM/AM seek and AF search
(When tuner SRC auto zero, L)
22~24
NC
O
Not used (output L)
25
CH-CONT
O
Changer control
H : Changer on, L : Changer off
Except changer model : Output L
26
TYPE REF
O
5V lines output for destination setting
H : During destination reading
27
SD
I
Tuner SD input
H : Station detected
28
NC
O
Not used (output L)
29
TYPE2
I
Destination type selection terminal 2
Refer to destination type list.
30
TYPE1
I
Destination type selection terminal 1
Refer to destination type list.