© 2004-02 PRINTED IN JAPAN
B53-0131-00 (N) 2439
CD RECEIVER
KDC-MP925
KDC-W8027
SERVICE MANUAL
*Size AA Battery
(Not Supplied)
Escutcheon
(B07-3078-01)
Plastic cabinet assy
(A02-2731-13)
Mounting hardware assy
(J21-9823-03)
* DC cord
(E30-4942-05)
* Antenna adaptor
(T90-0552-05)
Screw
(N99-1734-05)
Lever
(D10-4674-04) x 2
*Screw set
(N99-1723-05)
CD mechanism extension cord (24PIN) : W05-0935-00
* DC cord
(E30-6295-05)
*Remote controller assy
(A70-2040-05) : RC-505
*Remote controller assy
(A70-2026-05) : RC-420
* Depends on model. Refer to the parts list.
TDF PANEL INFORMATION
MODEL
PARTS NO.
PANEL NAME
KDC-MP925
KDC-W8027
Y33-1790-61
TDF-M7000
Panel assy
KDC-MP925 (A64-3226-01)
Panel assy
KDC-W8027 (A64-3232-01)
Panel assy
(A64-3252-02)
Panel assy
(A64-3248-02)
KDC-MP925/W8027
2
TUNER
CD
CH
MECHA
PANEL
TDF UNIT
SWITCH UNIT
(X16-208)
(X16-256)
(X34- )
(X16-253)
DISPLAY
UNIT
BUFFER
RDS
DECODER
BUFFER
REMO
RESET SW
KEY MATRIX
FL
SYSTEM
MPX
E-VOL
&
ACC DET
TEL MUTE
B.U DET
SYSTEM
DRIVER
MUTE
POWER
IC
ACC
TEL MUTE
BACK UP
SP OUT (FL)
RESET
KEY ILL
IC14
IC2
IC1
IC4
IC8
IC9
Q303,304
AM+B
AGC
E'S+
PRE MUTE
PRE MUTE
PRE MUTE
PRE OUT
(FRONT)
PRE OUT
(REAR)
(SUB WOOFER)
PRE OUT
AUX IN
OP AMP
OP AMP
OP AMP
SP OUT (FR)
SP OUT (RL)
SP OUT (RR)
EXT AMP
DIMMER
DIMMER
EXT.AMP.CON
ANT-CON
ANT CON
P-CON
P CON
WIRED REMO/
OPEL DISP I/F
FOCUS
SW
WOW
IC5
IC20
IC6
IC9
IC13
IC12
IC11
Q207,208
Q205,206
Q203,204
BU5V
SW 5V
SW 14V
5V
SERVO
FL+B
SW REG
A8V
PANEL
Q1,2
Q3,601
Q502,503
Q4,5
Q6-8
Q9,602
BU5V
SW5V
PANEL5V
SW14V
DC/DC
A8V
SERVO
CD4.7V
IC16
MOTOR
DR
DR
MOTOR
IC15
DC/DC
ROTARY
ENCODER
IC7
LEVEL
SHIFT
LEVEL
SHIFT
IC8
u-COM
IC11
IC2
MASK
ROM
2.5V
ROM
FLASH
IC4
BPF
PANEL
SW5V
IC6
3.3V
SW3.3V
Q5
FL+B
Q4
FL3.3V
Q2,3
EEPROM
EEP5V
Q501
IC1
Q23,24
Q26
Q25
IC18
Q27
Q29
IC10
Q6,10
Q11-14
IC19
LED
LED
EEPROM
MICROPROCESSOR
S-METER
AUDIO OUT
SERVO
8V
BU5V
CD4.7V
BACK UP
FM
AM
CD
QUAL
CH
PANEL5
KEY
BU5V
8V
SW5V
8V
8V
SW5V
BPF
8V
8V
9V
9V
9V
8V
9V
SW5V
FL+B
FAC
AGC
8V
8V
BU5V
BU5V
BU5V
SERVO
ILL+
SW5V
BLOCK DIAGRAM
KDC-MP925/W8027
3
SUB CIRCUIT UNIT (X16-2080-10)
Ref No.
Application / Functions
Operation / Condition / Compatibility
IC1
E2PROM
E2PROM for security
DISPLAY UNIT (X16-2530-11)
Ref No.
Application / Functions
Operation / Condition / Compatibility
IC1
Panel microprocessor
Panel control microprocessor
IC2
ROM IC
Graphic ROM
IC4
AVR
For 3.3V power supply
IC5
AVR
For 2.5V power supply
IC6
Buffer IC
Level shift buffer IC (5V
3.3V)
IC7
Buffer IC
Level shift buffer IC (3.3V
5V)
IC8
Remote control IC
For Remote control sensor
IC9
Logic IC
Control for FL contrast
IC10
Analog IC
Spectrum analyzer IC
Q1
3.3V Regulator
While PAN5V is applied when 3.3V regulator output is +3.3V
Q2
2.5V Regulator
While PAN5V is applied when 2.5V regulator output is +2.5V
Q3,4
FL +B SW
FL +B (VDD1) is turned on when Q3 base level goes H
Q5
3.3V SW
SW3.3V is turned on when Q5 base level goes L
Q6,200
FL 3.3V SW
FL +3.3V (VDD1) is turned on when Q200 base level goes H
Q7,8
Remote control ON SW
The power supply of IC8, 10 is turned on when Q10 base level goes H
Q9
FL BLK SW
VFD is turned on when Q9 base level goes H
Q11
Red LED SW
Red LED is turned on when Q11 base level goes H
SWITCH UNIT (X16-2560-10)
Ref No.
Application / Functions
Operation / Condition / Compatibility
Q1
DSI LED SW
DSI LED blinks when Q1 base level goes H/L
Q2
KEY Illumination SW (Green)
KEY Illumination SW "ON" when the Q2 base level goes H
Q3
KEY Illumination SW (Red)
KEY Illumination SW "ON" when the Q3 base level goes H
Q4
KEY Illumination SW (Blue)
KEY Illumination SW "ON" when the Q4 base level goes H
CD PLAYER UNIT (X32-5540-00)
Ref No.
Application / Functions
Operation / Condition / Compatibility
IC1
Mechanism control microprocessor
-
IC2
DSP
CD signal processor, RF amp, Servo control
IC3
Decoder IC
MP3/WMA decoder
IC4
BTL driver
Focus, Tracking coil, Feed and Spindle motor driver IC
IC5
AVR
SW3.3V AVR
IC6
AVR
BU3.3V AVR
IC7
AVR
BU2.5V AVR
IC8
Selector IC
Serial audio data selector
COMPONENTS DESCRIPTION
KDC-MP925/W8027
4
Ref No.
Application / Functions
Operation / Condition / Compatibility
IC9
AVR
3.3V AVR (IC2 DAC part)
Q1,4
Level shift FET
Level shift (3.3V - 5.0V)
Q3,5
Level shift TR
Level shift (3.3V - 5.0V)
Q6
Level shift TR
Level shift (3.3V - 5.0V)
Q7
Level shift TR
Level shift (3.3V - 5.0V)
Q8
APC
Auto power control
Q9,10
Switching TR
Sub beam delay control switch
ELECTRIC UNIT (X34-3030-10, X34-3032-71)
Ref No.
Application / Functions
Operation / Condition / Compatibility
IC1
System control IC
System control microprocessor
IC2
E-VOL & tuner IC
E-VOL. FM/AM tuner & stereo decoder
IC3
Power supply IC
For A8V AVR
IC4
Audio power IC
Audio power amplifier
IC5
System IC
For System E's control
IC6
Audio control IC
For WOW/FOCUS control
IC7
Power supply IC
-9V AVR (For 4.5V Pre-out)
IC8
Reset IC
When BU5V line voltage is less than 3.5V, this IC output line is "L"
IC9
Muting logic IC
Control for MUTE, P-ANT & RESET muting
IC10
Buffer IC
For spectrum analyzer
IC11~13
OP AMP
For 4.5V Pre-out
IC14
RDS decoder
Decode for RDS signal
IC15,16
Motor driver
Control for Panel mechanism motor
IC18
P-CON IC
Power control IC
IC19
Power supply IC
Switching regulator IC for CD4.7V
IC20
Analog SW
Control for WOW/FOCUS IC (IC4)
Q1,2
BU 5V AVR
While BU is applied when BU5V regulator output is +5V
Q3,601
SW5V AVR
When Q601base level goes H, SW5V regulator output is +5V
Q4,5
SW14V AVR
When Q5 base level goes H, SW14V regulator output is +14V
Q6~8
Audio 8V AVR
When Q6 base level goes H, A8V regulator output is +8.3V
Q9,602
Servo +B AVR
When Q602 base level goes H, S+B regulator output is +7.5V
Q11~14
Illumination & DC/DC +B AVR
When Q11 base level goes H, AVR output is +9.2V
Q15,16
Audio 10.5V AVR
When Q16 base level goes H, AVR output is +10.5V
Q17~19
Pre Amp & -9V AVR
Q18,19 work as differential amplifier, Q17 wark as driver and -9.1V is supplied to
OP AMP for Pre-out
Q20~22
Pre Amp & +9V AVR
Q20,22 work as differential amplifier, Q21 wark as driver and +9.4V is supplied to
OP AMP for Pre-out
Q23,24
P-ANT SW
When Q23 base level goes H, P-ANT SW output is +14V
Q25
Buffer
EX amp control buffer
Q26
Small lamp det. SW
When Q26 base level goes H, Q26 turned ON
COMPONENTS DESCRIPTION
KDC-MP925/W8027
5
Ref No.
Application / Functions
Operation / Condition / Compatibility
Q27
BU detector
When Q27 base level goes H, Q27 turned ON
Q29
ACC detector
When Q29 base level goes H, Q29 turned ON
Q30,31
Muting driver
When base level goes L, muting driver is turned ON
Q201
Buffer
Noise detect buffer amp
Q202
E-VOL muting SW
When Q202 base level goes H, muting SW is turned ON
Q203~208
Pre-out muting SW
When base level goes H, Pre-output is muted
Q210
AGC
For AGC for spectrum analyzer
Q303,304
AM +B SW
When Q303 base level goes H, AM +B is out to tuner unit
Q305
Buffer
Composite signal buffer for RDS
Q501
E2P 5V SW
When Q501 base level goes L, E2P 5V is out for E2PROM
Q502,503
Panel 5V SW
When Q503 base level goes H, Panel 5V is out
Q603
SW
When Q603 base level goes H, Q603 is turned ON
COMPONENTS DESCRIPTION
SYSTEM MICROPROCESSOR : UPD703030GC041 (X34-303 : IC1)
Pin No.
Pin Name
I/O
Description / Processing Operation
Fig.
1
PLL DATA
I/O
Data input/output terminal for Tuner front-end
2
AM+B
I/O
AM+B (AM operation : H)
3
(FM+B)
O
FM+B (FM operation : H, Last FM : H with RDS, RBDS model)
4PAN E2P DATA
I/O
Variable illumination D/A converter, E2PROM DATA terminal
5PAN E2P CLK
I/O
Variable illumination D/A converter, E2PROM CLK terminal
6
EVDD
-
VDD 5V
7
EVSS
-
GND
8
AFS
O
Time constant switching for noise detection (FM seek, AF search, AUTO 0 : L, Receiving : H)
9
BEEP
O
BEEP audio output terminal
10
REMO
I
Remote control input terminal
11
P MUTE
O
Audio power IC muting control terminal (POWER OFF, ALL OFF, TEL MUTE : L)
12
SVR
O
Audio power IC SVR discharge circuit control terminal
13
IC2 SDA
I/O
CD mechanism, IC2, IC5, ROM correction DATA line
14
IC2 CLK
I/O
CD mechanism, IC2, IC5, ROM correction CLOCK line
15
P STBY
O
Audio power IC Stand-by terminal (POWER IC ON, ALL OFF : H, POWER IC OFF : L)
16
P CON
I/O
Power control terminal (POWER ON : H, POWER OFF, ALL OFF : Hi-Z)
17
WOW MODE2
O
WOW control terminal
1
MICROCOMPUTER'S TERMINAL DESCRIPTION