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& Australia model




SERVICE MANUAL
MODEL DCM-380/280
STEREO CD PLAYER




1 Some illustrations using in this service manual are slightly different from the actual set.




16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321

X-0162 NC 0211
DCM-380/280 2



SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.

LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to
chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either
side of the power cord is less than 460 kohms, the unit is defective.




2
DCM-380/280 3

BLOCK DIAGRAM




3
CD MECHANISM
CD PICKUP
WIRING DIAGRAM




CP704
CP401 CN101
TRANS




C3P101
JK302




CN301




4
CP705




MAIN SECTION




CP403
AC CORD
CN706




CP501




CP402
CP502
POWER SWITCH
SW701




FRONT SECTION




CN802
CN801
DCM-380/280
4
DCM-380/280 5

DISASSEMBLY
(To reassemble, reverse disassembly.)

1. TOP COVER
Remove 4 screws A fixing the Top
Cover and 5 screws A mounting the
Rear Panel, then detach the Top Cover
as shown in the arrow direction.




2. MAIN P.W.B.
Remove 1 screw A , 2 screws B ,1
screw C fixing the Main P.W.B. and 1
screw B mounting the rear Panel; then
detach the Main P.W.B. as shown in the
arrow direction.


4




3. FRONT PANEL
Remove 2 screws D mounting the
Front Panel; 2 side screws B and 5
below screws A mounting the Front
Panel, then detach the Front Panel as
shown in the arrow direction.




5
DCM-380/280 6
4. CONTROL P.W.B.
Remove 8 screws E mounting the
Front Panel and 1 E screw fixing the
Control P.W.B., then detach the Control
P.W.B. as shown in the arrow direction.




5. BACK PANEL
Remove 3 screws F mounting the Bot-
tom Cover, then detach the Back Panel
as shown in the arrow direction.

Note: Only in 3x5mm, other screws
can't be used.




6. LOADER ASS'Y
Remove 1 screw G and 4 screws H
mounting the Bottom Cover, then detach
the Loader Ass'y as shown in the arrow
direction.




6
DCM-380/280 7

SEMICONDUCTORS

CXD3068Q




WDCK
WFCK




PCMD
EMPH




MUTE
VPCO




C2PO
XUGF
XTAO


V16M




LRCK
XTSL




VCTL
XTAI




BCK
GFS
71 72 69 59 60 58 11 13 68 10 17 14 65 66 67 3
37 TES1
36 TEST
FSTO 27 Clock Error
2 XRST
C4M 16 Generator Corrector
EFM D/A
RFAC 50 demodurator Interface
ASYI 49
Asymmetry
ASYO 48
Corrector
ASYE 62 32K
Digital 63 MD2
BIAS 57 RAM
OUT 64 DOUT

XPCK 12
Sub Code
FILO 53 Processor
Digital
FILI 54
PLL
PCO 55
CLTV 52
MDP 25
Digital
LOCK 24
CLV
PWMI 23

SENS 7
DATA 4
XLAT 5
CLOK 6
SCOR 15 CPU
SBSO 79 Interface

EXCK 80 Servo
SCSY 78 Auto
Sequencer
SQSO 76
SQCK 77
Signal processor block

Servo block
73 SOUT
74 SOCK
75 XOLT
SERVO 8 SCLK
Interface
19 COUT
26 SSTP
9 ATSK
20 MIRR
MIRR
DFCT 21 DFCT
RFDC 43 FOK 22 FOK
CE 42
TE 41 SERVO DSP PWM GENERATOR
33 FFDR
OPAmp A/D FOCUS PWM
SE 40 FOCUS SERVO
Analog SW Converter GENERATOR 34 FRDR
FE 39
TRACKING TRACKING PWM 31 TFDR
VC 38 SERVO GENERATOR 32 TRDR
IGEN 46
SLED PWM 29 SFDR
SLED SERVO
GENERATOR
30 SRDR

44
ADIO




7
DCM-380/280 8




AC_SUM
CXA2581N




EQ_IN

RFG




RFC
VFC
BST
4 3 23 24 26 25

AC AC
EQ
SUM VCA
15 RFAC
EQ_ON/OFF

RW/ROM
30 DC_OFST

29 RFDCI
DVCC
VC RW/ROM 28 RFDCO
VC
A 6
17 FEI
B 7 DVCC
C 8 16 FE

D 9 VOFST DVC
RW/ROM
VC
19 TE_BAL
RW/ROM

VOFST RW/ROM
VC
F 10 gm DVCC

18 TE
E 11 gm
VC
VOFST RW/ROM

B
DVC 21 CEI
C DVCC
A 20 CE
D DVC
VC
RW/ROM
APC-OFF (Hi-Z) DVC
SW 12 RW/ROM VC VOFST
(H/L)
VCC
PD 2 APC VC 13 DVCC
LD 1 VC DVC
VCC


22 5 27 14
VCC


GND




VC




DVC




8
INT3/NMI

INT1
INT0
XTAL




INT2
VDD



EXTAL

TEX
VSS

RST



TX
2

AN0 to AN7 8 A/D CONVERTER
SPC 700 CLOCK GENERATOR/
PORT A 8 PA0 to PA7
CPU CORE SYSTEM CONTROL
G0/A0 to G15/A15 16
FDP
A16 to A23 8 CONTROLLER/ RAM 8 PB0 to PB7
DRIVER
A24 to A56 32
PORT B




VFDP
KR0 to KR7 8 KEY SCAN RAM
ROM RAM 8 PC0 to PC7
RxD UART RECEIVER
PORT C




32K/40K/ 52K/60K 3984
TxD UART TRANSMITTER BYTES BYTES
UART BAUD RATE
8 PD0 to PD7
GENERATOR
PORT D




INTERRUPT CONTROLLER
PWM 14-BIT PWM GENERATOR 6 PE0 to PE5




9
2 PE6 to PE7
PORT E




RMC REMOCON FIFO

CS0 8 PF0 to PF7
SERIAL
BUFFER
PORT F




SI0
INTERFACE
SO0 RAM
SCK0 (CH0)
8 PG0 to PG7
SI1
PORT G




SO1 SERIAL INTERFACE (CH1) PRESCALER/ 32kHz
SCK1 TIME-BASE TIMER TIMER/COUNTER
2
EC0 8-BIT TIMER/COUNTER 0 8 PH0 to PH7
PORT H




8-BIT TIMER 1
2
TO 16-BIT CAPTURE 4 PI0 to PI4
CINT
PORT I




TIMER/COUNTER 2
EC1
2
ADJ
DCM-380/280



CXP82032/82040/82052/82060
9
DCM-380/280 10


PCM1748




BCK



Serial
LRCK Input Output Amp and VOUTL
DAC
I/F Low-Pass Filter


DATA 8x
Oversampling Enhanced
Digital Filter Multi-Level
with Delta-Sigma
VCOM
Function Modulator
ML
Controller


Function Output Amp and
DAC
MC Control Low-Pass Filter VOUTR
I/F


MD

System Clock

System Clock
SCK Zero Detect Power Supply
Manager
ZEROL




ZEROR




VDD
DGND


VCC
AGND
BA033FP




10
DCM-380/280 11




BA5979S


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17


100 10k
PreVCC POWVCC 50k
D D D D
F R 50k
10k R MUTE
+
-




+
-
INTER-
19k
FACE

F LEVEL
10k
SHIFT
POWVCC
50k
THERMAL
Vref
F 50k SHUTDOWN

INTER-
FACE REGULATOR
R F T. S. D
F R MONITOR

INTER-
FACE R
F R POWVCC D D D D




1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16




NJM-4556D




11
DCM-380/280 12




NJM78L00A
NJM78L00UA


NJM78L00EA
(5V,9V,12V)


BA4558 / BA4558F / BA4558N
BA4558 / BA4558F BA4558N




OUT1 1 8 VCC


+ +
1ch 2ch