Denon DCM-280, DCM-380 Service Manual
For U.S.A., Canada, Europe, U.K.
& Australia model
SERVICE MANUAL
MODEL
STEREO CD PLAYER
DCM-380/280
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
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
2
BLOCK DIAGRAM
DCM-380/280
3
3
WIRING DIAGRAM
AC CORD
DCM-380/280
4
CD PICKUP
TRANS
CP704
CN101
CP401
CP705
SW701
CN706
POWER SWITCH
CP502
FRONT SECTION
CD MECHANISM
C3P101
MAIN SECTION
CP501
CP403
CN301
JK302
CP402
CN802
CN801
4
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.
DCM-380/280
5
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.
4
5
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 Bottom Cover, then detach the Back Panel
as shown in the arrow direction.
DCM-380/280
6
Note: Only in φ3x5mm, 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
SEMICONDUCTORS
DCM-380/280
CXD3068Q
7
FSTO
C4M
RFAC
ASYI
ASYO
ASYE
BIAS
XPCK
FILO
FILI
PCO
CLTV
MDP
LOCK
PWMI
SENS
DATA
XLAT
CLOK
SCOR
SBSO
EXCK
SCSY
SQSO
SQCK
RFDC
CE
TE
SE
FE
VC
IGEN
XTAI
72
71
27
16
50
49
48
62
57
12
53
54
55
52
25
24
23
7
4
5
6
15
79
80
78
76
77
43
42
41
40
39
38
46
OPAmp
Analog SW
V16M
XTSL
XTAO
69
59
Clock
Generator
Asymmetry
Corrector
Digital
PLL
Digital
CLV
CPU
Interface
VPCO
60
58
A/D
Converter
44
VCTL
GFS
XUGF
13
68
11
EFM
demodurator
Sub Code
Processor
Servo
Auto
Sequencer
WFCK
EMPH
10
Error
Corrector
32K
RAM
SERVO
Interface
MIRR
DFCT
FOK
SERVO DSP
FOCUS SERVO
TRACKING
SERVO
SLED SERVO
WDCK
C2PO
65
14
17
D/A
Interface
PWM GENERATOR
MUTE
BCK
PCMD
LRCK
66
67
3
Digital
OUT
Signal processor block
Servo block
FOCUS PWM
GENERATOR
TRACKING PWM
GENERATOR
SLED PWM
GENERATOR
TES1
37
TEST
36
XRST
2
63
MD2
DOUT
64
73
SOUT
74
SOCK
XOLT
75
SCLK
8
COUT
19
SSTP
26
ATSK
9
MIRR
20
21
DFCT
22
FOK
33
FFDR
34
FRDR
31
TFDR
32
TRDR
29
SFDR
30
SRDR
ADIO
7
EQ_IN
AC_SUM
RFG
BST
26242334
RFC
25
VFC
CXA2581N
DCM-380/280
8
AC
SUM
AC
VCA
EQ
15
RFAC
EQ_ON/OFF
VC
RW/ROM
RW/ROM
DV
CC
30
29
28
DC_OFST
RFDCI
RFDCO
VC
6
A
7
B
8
C
9
D
VOFST
RW/ROM
DVC
DV
CC
17
16
FEI
FE
VC
19
18
TE_BAL
TE
RW/ROM
gm
VC
10
F
11
E
gm
VOFST
VC
VOFST
DVCC
RW/ROM
RW/ROM
SW
PD
LD
12
B
21
20
CEI
CE
C
DVC
DV
CC
A
D
VC
DVC
RW/ROM
APC-OFF (Hi-Z)
RW/ROM
(H/L)
APC
2
1
VC
DVC
VC
V
CC
DVC
VC
VOFST
13
DVCC
VCC
145
DVC
VCC
GND
2722
VC
8
DCM-380/280
8-BIT TIMER/COUNTER 0
8-BIT TIMER 1
UART BAUD RATE
GENERATOR
UART RECEIVER
UART TRANSMITTER
INT2
XTAL
PWM
RAM
3984
BYTES
SPC 700
CPU CORE
A/D CONVERTER
INT3/NMI
INT1
INT0
AN0 to AN7
8
PA0 to PA7
FDP
CONTROLLER/
DRIVER
32kHz
TIMER/COUNTER
PRESCALER/
TIME-BASE TIMER
RST
V
DD
V
SS
PORT A
PORT B
PORT C
PORT D
PORT E
PORT F
PORT G
8
8
6
2
8
8
8
8
PB0 to PB7
PC0 to PC7
PD0 to PD7
PE0 to PE5
PF0 to PF7
PG0 to PG7
PE6 to PE7
TEX
EXTAL
TX
CS0
2
ROM
32K/40K/ 52K/60K
BYTES
RAM
KEY SCAN
PORT H
PH0 to PH7
8
CLOCK GENERATOR/
SYSTEM CONTROL
14-BIT PWM GENERATOR
FIFOREMOCON
RMC
SI0
SO0
SCK0
SI1
SO1
SCK1
EC0
TO
CINT
EC1
ADJ
G0/A0 to G15/A15
A16 to A23
A24 to A56
V
FDP
KR0 to KR7
16
8
32
8
2
SERIAL INTERFACE (CH1)
16-BIT CAPTURE
TIMER/COUNTER 2
SERIAL
INTERFACE
(CH0)
BUFFER
RAM
2
2
PORT I
PI0 to PI4
4
TxD
RxD
INTERRUPT CONTROLLER
RAM
CXP82032/82040/82052/82060
9
9
BCK
DCM-380/280
10
PCM1748
LRCK
DATA
ML
MC
MD
SCK
Serial
Input
I/F
Function
Control
I/F
System Clock
Manager
Oversampling
Digital Filter
System Clock
8x
with
Function
Controller
ZEROL
Enhanced
Multi-Level
Delta-Sigma
Modulator
Zero Detect
ZEROR
DAC
DAC
Output Amp and
Low-Pass Filter
Output Amp and
Low-Pass Filter
Power Supply
DD
V
DGND
CC
V
AGND
V
L
OUT
V
COM
V
R
OUT
BA033FP
10
DCM-380/280
25 24 23 22 21 2032 31 30 29 28 27 26 19 18 17
100
10k
-
10k
10k
INTER-
FACE
FR
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
+
F
R
INTER-
FACE
FR
-
+
F
R
FR
INTER-
19k
FACE
POWV
50k
Vref
50k
CC
PreV
CC
POWV
R
F
MUTE
REGULATOR
OW
V
CC
P
50k
CC
T. S. D
MONITOR
D D DD
50k
D D D D
THERMAL
SHUTDOWN
LEVEL
SHIFT
11
BA5979S
NJM-4556D
11
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