Page 1
SERVICE MANUAL
SERVICE MANUAL
DX-7555
Ref. No. 3911
122005
/ 092006
COMPACT DISC PLAYER
MODEL DX-7555
Black, Silver and Golden models
BMPP
SMPP
GMGT
GMGR
GMDT
BMDC
SMDC
230-240V AC, 50Hz
230-240V AC, 50Hz
220-230V AC, 50/60Hz
220-230V AC, 50/60Hz
120V AC, 60Hz
120V AC, 60Hz
120V AC, 60Hz
ON STANDBY
OPEN/CLOSE
1 2 3
4 5 6
7 8 9
10
10/0 CLR
ENTER
SETUP
RANDOM REPEAT
RC-625C
SEARCH
MEMORY
ENTER
DISPLAYDIMMER
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
Page 2
SPECIFICATIONS
DX-7555
Signal readout :
Frequency response :
SN ratio :
Audio dynamic range :
THD (total harmonic distortion) :
Audio output
Digital optical :
Audio output / Impedance
Digital coaxial :
Audio output / Impedance
Analog :
Power supply :
Power consumption :
Standby power consumption :
Optical non-contact
2 Hz - 20 kHz
111 dB
100 dB
0.0027%
-22.5 dBm
0.5 Vp-p, 75 ohm
2.0 V (rms), 470 ohm
AC 230 - 240 V, 50 Hz
AC 220 - 230 V, 50/60 Hz
AC 120 V, 60 Hz
16 W / 14 W
European : 0.5 W
North American : 0.3 W
Others : 0.4 W / 0.3 W
Dimensions (W x H x D) :
Weight :
Operation condition
Temperature, humidity :
Supported discs :
Specifications and appearance are subject to change for
improvement without prior notice.
435 x 111 x 405 mm
8.0 kg
5 - 35 , 5 - 85 % (no condensation)
CD, CD-R, CD-RW, MP3
(Discs that have not been properly finalized may only be
partially playable or not playable at all.)
Page 3
SERVICE PROCEDURE-1
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
DX-7555
This set employs a laser. Therefore, be sure to follow
carefully the instructions below when servicing.
WARNING!!
SERVICE WARNING : DO NOT APPROACH THE
LASER EXIT WITH THE EYE TOO CLOSELY.
IN CASE IT IS NECESSARY TO CONFIRM LASER
BEAM EMISSION, BE SURE TO OBSERVE FROM
A DISTANCE OF MORE THAN 30cm FROM THE
SURFACE OF THE OBJECTIVE LENS ON THE
OPTICAL PICKUP BLOCK.
LASER W ARNING LABEL
The labels shown below are affixed.
1. Warning label
Laser Diode Properties
Material: GaAS/GaAlAs
Wavelength: 760-800nm
Laser output: max. 0.5mW*
Emission Duration: continuous
*This output is the value measured at a distance about 1.8mm
from the objective lens surface on the Optical Pickup Block.
DANGER:
INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCK FAILED OR DEFEATED. AVOID DIRECT
EXPOSURE TO BEAM.
2. Class 1 label
LUOKAN 1
CLASS 1 LASER
PRODUCT
Printed on rear panel
LASERLAITE
KLASS 1
LASER APPARAT
PRECAUTIONS
1. Ground for the work-desk.
Place a conductive sheet such as a sheet of copper
(with impedance lower than 10 Mohm) on the work desk and place the set on the conductive sheet so that
the chassis can be grounded.
2. Grounding for the test equipments and tools.
Test equipments and toolings should be grounded in
order that their ground level is the same the ground of
the power source.
CAUTION:
HAZARDOUS LASER AND ELECTROMAGNETIC
RADIATION WHEN OPEN AND INTERLOCK DEFEATED.
ATTENTION:
RAYONNEMENT LASER ET ELECTROMAGNETIQUE
DANGEREUX SI OUVERT AVEC L'ECLENCHEMENT
DE SECURITE ANNULE.
3. Grounding for the human body.
Be sure to put on a wrist-strap for grounding whose
other end is grounded.
Be particularly careful when the workers wear
synthetic fiber clothes, or air is dry.
4. Select a soldering iron that permits no leakage and
have the tip of the iron well-grounded.
5. Do not check the laser diode terminals with the
probe of a circuit tester or oscilloscope.
Page 4
SERVICE PROCEDURE-2
1. Initialize the unit.
(1) Press and hold down the STOP [ ] button, then press the FF (fast forward) [ ] button. All segments light up.
(2) Press and hold down the STOP [ ] button, then press the PUSH TO ENTER (JOG) button.
FL display
0 0:00 NO DISC
(3) Press the POWER button to turn off the unit.
(4) Disconnect the AC power cord from a wall outlet.
2. Check the version of Main microprocessor (Q8005) and Servo microprocessor (Q1001).
(1) Connect the AC power cord into a wall outlet.
(2) Press the POWER button to turn on the unit.
(3) Change into the state of "NO DISC".
(4) Press and hold down the STOP [ ] button, then press the FF (fast forward) [ ] button twice.
The first press lights up all segments.
Main microprocessor version ---> Servo microprocessor version
FL display
MA 050830A SRV 5805A MODEL00 00
--->
--->
--->
--->
DX-7555
NO DISC
(5) Press the POWER button to turn off the unit.
(6) Disconnect the AC power cord from a wall outlet.
3. Setting position before shipment.
(1) POWER button : OFF
(2) PHONES LEVEL : MIN.
4. Take out the Disc.
If cannot take out the disc, please take out disc as follows.
(1) The lever in the direction of the arrow.
(2) The tray is slowly drawn out by the hand.
--- Bottom view ---
Lever
Front panel
Page 5
DX-7555
EXPLODED VIEW
A901
A110
P901
A073
L001
T902
A002
x 10 pcs.
Refer to
"EXPLODED VIEWS
OF MECHANISM"
A072
x 3 pcs.
U04
E012
A141
U03
A136
x 2 pcs.
A060
x 2 pcs.
A109
A105
x 4 pcs.
A006
E011
A074
x 4 pcs.
A056
P1002
A004
A090
A141
U02
D
Z008
A090
A090
A103
x 4 pcs.
D
P1003
With MECHANISM
A028
A126
U08
A012
U05
A076
x 4 pcs.
A074
x 8 pcs.
A141
U10
A
B
A
B
A030
x 2 pcs.
E004
E006
C
A124
U07
A058
A014
x 4 pcs.
A016
x 4 pcs.
U09
U01
C
A012
x 10 pcs.
A088
x 2 pcs.
A070
x 2 pcs.
A060
x 2 pcs.
P7001
A090
A042
A024
x 4 pcs.
A012
x 2 pcs.
A026
x 3 pcs.
U06
A130
A128
A048
A012
x 5 pcs.
A010
A012
A036
A038
A012
x 6 pcs.
A044
A062
A012
x 6 pcs.
A052
A032
A068
A104
x 3 pcs.
A012
x 2 pcs.
A034
A102
A040
A100
A020
A108
A018
A090
A090
A012
x 3 pcs.
A066
DX-7555
Page 6
EXPLODED VIEWS OF MECHANISM-1
CD LOADER MECHA. Z001 : MGD-34
Parts No. 24800055C
<Note>
CD MECHA. =
Loader mecha. : "MGD-34" + Drive unit : "KSM-213CLCM"
33
DX-7555
18
x 2
18
x 2
09
21
25
11
18
21
08
06
15
16
Z003
x 2
Z007
26
05
Z006
12
13
18
x 2
20
x 2
Z003
(Silver)
Z005
Z002
Drive unit : KSM-213CLCM
Refer to
"EXPLODED VIEWS OF MECHANISM-2"
30
18
17
23
32
24
Z004 x 2
19
03
28
07
10
19
(Gold)
22
04
03
02
Z006 x 2
14
31
x 2
20
Z006
Z003
Z005
01
(Silver)
Page 7
EXPLODED VIEWS OF MECHANISM-2
CD DRIVE UNIT : KSM-213CLCM
DX-7555
54
61
53
58
55
OK
51
NG
52
56
PARTS LIST
REF. NO. PART NO. (SN) DESCRIPTION
51
52
53
54
55
56
57
58
61
X-2625-877-1
X2625-769-1
2626-908-01
24810023
7621-255-15
24840008
1639-678-12
1-564-722-11
8848-483-05
57
Motor chassis ass'y
Motor gear ass'y
Sled shaft
Gear (A) (S)
P2 x 3, Screw
Leaf switch
Motor PC board
Connector 6pin
KSS-213C, Pickup
Q'TY
1
1
1
1
2
1
1
1
1
Page 8
SCHEMATIC DIAGRAMS-1
DX-7555
A
1
2
3
4
5
BCDEFGH
CDSCORI
VDD_CPU
VDD_CPU
CDSVSO
CDSVCK
CDSVRE
FLASHHS
FLASHCK
FLASHO
FLASHRST
FLASHI
VDSPD3.3V
CDDATA2
IREQ
C2PO
MNT2
MNT1
MNT0
FLASHVPI
VDD_CPU
CDOPENSW
CDCLOSESW
RFAC
VC
CDSVRST
ACK_1
CDFOK
CDSCORI
ACK1
CDRESET
CDXLAT1
CDCLOK2
CDCLOCK_1
CDDATA_1
CDDATA2
CDOPEN
CDCLOSE
CDCLOSESW
CDOPENSW
CDSENS_1
CDDATA_1
IREQ_1
CDSVRQ
CDSVCK
CDFOK_1
CDCLOSESW
CDOPENSW
CDCLOSE
CDOPEN
CDXLT_1
EXCLK
EXCLK
CDANAMUT
CDSVAK
CDSVRE
CDSVRST
VSW_CPU
SRDR
TFDR
TRDR
FFDR
FRDR
SSTOP
SP-
SP+
SL+
SL-
VDDM
CDFOK
LD
E
F
A
B
C
D
SSTOP
PD
+3.3V
LD-
LD+
AVD1_+3.3V
CDSENS
ACK
VC
ACK_1
VC
VDDPIC
VDDPIC
CDSVSI
CDXLAT_2
CDXLAT_1
SFDR
CDSVRST_1
CDSVSI
PDSENS
PDSENS
B
D
F
LD
PD
E
A
C
CDRESET
TFDR
TRDR
FRDR
FFDR
SL+
SL-
SP-
SP+
REQ
CDRESET
OP_+8V
OP_+8V
VDSPD3.3V
MECHA_+B
TR+
TR-
FO+
FO-
FLASH_VPI
GNDD
GNDD
GND_CPU
GND_CPU
GND_CPU
GNDD
LD_GND
GNDD
GNDM
GND_CPU
GND_CPU
GNDM
CDCLOCK_1
CDSVRE
CDSVSO
GND_D
DOUT_1
CDCLOK_2
CDDATA_2
TRACKING
LD
VR
FO-
E
D
A
B
C
F
2.5V
5V
VC
+5V
LD-G
PD
FOCUS
TR-
TR-
FO+
INSW
LD+
LD-
DGND
OUTSW
M
pick short terminal
SSTOP
3.3V
SL-
SL+
SP-
SP+
M
M
DIGITAL OUT
<UJJ> Only
0R3005 NC
C3014 104 NC
UJJ ELSE
U3002 NC
NCR3006 0
C2035 NM
R2046
15K
C2034
102
C2033
NM
C2005 104Z
TP2003
MIRR
TP2004
DFCT
TP2001
COUT
TP2005
LOCK
5
R1038 100
C1019
P2004
1
CPUGND
2
CDSVSO
3
CDSVSI
4
CDSVCK
5
RST
6
EV5V
7
Vpp/test
8
NC
P2001 Error_Rate
12345
6
C1016
R1017
1K
R1018
10K
R1020
C1014
C1013
R1008
10K
R1007
10K
1.5 to 1.6
TP2006
R2056
3.3K
R2051
10K
R2052
470K
C2046
332
R2060
15K
3.3
R2062
470K
C2061
101
R1067
1K
R1070
1K
R1064
1K
D1001
1SS355
R1049
390
TP1001 CDRW
R2048
0
R2049
0
R2050
0
R2044
15K
R2043
0
R2045
0
R2041
0
R2040
0
3.3
R2019
0
C3009
C3010
C3008
C3001
224
C3013
104
C3012
330/16
+
Q3001
74HCU04AF
7
GND
65432
114
VCC
131211109
8
Q1002
TC7WT241FU
1
G
2
A1
3
Y2
4
GND5A2
6
Y1
7
G
8
VCC
Q1003
TC7WT241FU
1
G
2
A1
3
Y2
4
GND5A2
6
Y1
7
G
8
VCC
Q1004
TC7WT241FU
1
G
2
A1
3
Y2
4
GND5A2
6
Y1
7
G
8
VCC
3
2
1
Q1005
TC7WZU04FU
567
8
VD
123
4
GND
Q2001
BD7931F
1
VCC
2
M+
3
M-
4
POWGND5PREGND
6
CONT
7
REV_IN
8
FWD_IN
Q2003
CXD3014R
31
MIRR
32
DFCT
33
FOK
34
DVSS4
35
DVDD5
36
DVSS5
37
LOCK
38
MDP
39
SSTP
40
IOVSS4
41
SFDR
42
SRDR
43
TFDR
44
TRDR
45
FFDR
46
FRDR
47
IOVDD1
48
AVD1
49
AVS1
50
E
51
F
52
TEI
53
TEO
54
FEI
55
FEO
56
VC
57
A
58
B
59
C
60
D
61
AVD262RFDCO63PDSENS64AC_SUM65EQ_IN66LD67PD68RFC69AVS270RFACO71RFACI72AVD373BIAS74ASYI75ASYO76VPCO77VCTL78AVS379CLTV80FILO81FILI82PCO83SRAMVSS184SRAMVDD1
85
6
7
XTACN
8
XRST
9
DVSS3
10
IREQ
11
CLOK
12
DATA2
13
XLAT2
14
REQ
15
ACK
16
XLAT
17
DVDD3
18
SRAMVSS3
19
SRAMVDD3
20
SENS
21
WFCK
22
XUGF
23
XPCK
24
GFS
25
C2PO
26
SCOR
27
DVDD4
28
COUT
29
SRAMVSS4
30
SRAMVDD4
L3001
BLM21B222SPT
L3002
BLM21B222SPT
T3001
NSRF-2046
U3001
TOTX141
1
GND
2
V
3
IN
P2002
for_Jitter_Measure
2
1
R2020
22K
C2014
472
C2004
104Z
R2007
5.6K
C2043
104Z
C2006
104
C1008
104Z
C2029
104Z
C2067
C3011
104
C1010
104Z
C1009
104Z
C2008
104Z
C2013
104
C2025
104Z
R2053
1K
C2058
104
C2052
100/16
+
C3006
223
C3003
223
C2032 681
C2002 104Z
C2003
470/16
+
C2063
100/16
+
C2037
100/16
+
R2047
0
C2036
100/16
+
C1011
100/16
+
C9001
C2050
100/16
C3007
330/16
+
C3002
22/50
+
R1004
NC
R1003
10K
R1002
10K
R1009
100
R1010
100
R1011
100
R1006
10K
R1005
10K
C1015
TP1002 CD2SPD
TP1003
CD4SPD
R1012
0
R1016
0
R1013
0
R1015
10K
R1037
0
R1033
0
R1032
0
R1029
0
R1027
0
R1025
0
R1021
R1026
0
R1028
0
R1024
0
R1022
0
R1023
R1030
10K
R1031
R1035
10K
R1034
10K
C1017
C1007
104Z
R1036
R1046
0
R1039
100
R1043
0
R1053
1K
R1055
1K
R1052
560
R1057
0
R1051
47
R1050
560
R1058
0
R1061
560
R1060
560
R1059
560
R1068
R1065
R1066
R1069
R1062
0
R1063
0
C1012
104Z
R1072
R2012
0
R2010
0
R2009
0
TP2002
WFCK
R2011
0
R2008
15K
R2005
R2018
0
R2016
0
R2027
0
R2030
0
R2023
0
R2025
0
R2034
0
R2032
0
R2022
R2039
0
R2055
100K
R2058
1M
R2054
4.7K
C2059
104Z
C2044
R2072
0
R3001
150
C3005
223
C3004
223
R3004
C3014
U3002
1
GND
2
V
3
IN
R3005
0
R3006
R1074
R1075
NC
P1004B
CN12
Val
1
2
3
4
5
6
7
8
9
10
11
12
R1019
10K
R1056
1k
R1047
0
R1001
NM
C1018
C2062
NC
R2065
R2057
0
R2061
0
R3003
100
P3001
COAXIAL
3
R1014
0
P1003
for_SL_SP_Motor
1
2
3
4
5
6
R2063
33
Q2006
2SA1162
R2037
10K
R2021
0
R3002
150
L3003
BLM21B222SPT
Q2002
BA5947FP
15
CH4OUTR16CH4OUTF17CH3OUTF18CH3OUTR19POWVCC20MUTE21GND30fin22CH3RIN23CH3FIN24CH4IN25CH4CAPA26OUTVREF27OPOUT28PREVCC
1
OPIN-
2
OPIN+
3
SW
4
CH1FIN
5
CH1RIN
6
CH2FIN
7
CH2RIN
29
fin
8
GND
9
VREFIN
10
POWVCC
11
CH2OUTR
12
CH2OUTF
13
CH1OUTR
14
CH1OUTF
P1005B
4
3
2
1
P9004
ACINLET
2 1
P1001
for_Loading_Motor
5
4
3
2
1
R1073
R1040
0
R1045
0
R10410R10420R1044
0
Q9001
78M05
3
O
2
G
1
I
C2030
1000/16
+
Q2007
UPC2906HF
3
O
2
G
1
I
P9011BP9011A
C2064+C2069
330/16
+
C2041
104K
C2040
103K
C2047
104K
C2045
104K
C2049
104K
C2053
474K
C2051
152K
P3002A
3
2
1
C2048
NC
D2001
L2005
2.2u
L2004
2.2u
L1001
2.2u
L2001
2.2u
Q1001
MPD78F4225GC
61
CDSVGPI
62
CDSCORI
63
CDSVRQ
64
CDIREQ
65
CDACK
66
NC
67
VSS0
68
VDD1
69
X2
70
X1
71
TEST/VPP
72
NC
73
GND
74
VDD0
75
AVDD
76
GPANI0
77
GPANI1
78
GPANI2
79
GPANI3
80
GPANI4
1
GPANI52GPANI63GPANI74AVSS5GPANO06GPANO17AVREF18CDDATA2I9CDDATA2O10CDCLOK211CDSENS12CDDATA13CDCLOK14CDSVAK15CDSVRE/FLASHHS
16
CDSVSI/FLASHI17CDSVSO/FLASHO
18
CDSVCK/FLASHCK
19
CDSVGPO20CDXLT
21
CDFOK
22
CDRESET
23
CDREQ
24
CDPOWER
25
CDLAT2
26
CDEMPHASIS
27
CDDACRST
28
CDDACCS
29
CDDACCLK
30
CDDACSO
31
CDDACMUT
32
CDANAMUT
33
VSS1
34
CDOPEN
35
CDCLOSE
36
CDOPENSW
37
CDCLOSESW
38
CD4SPD
39
CD2SPD
40
CDRW
41
NC42NC43NC44NC45NC46NC47NC48NC49NC50NC
51
VDDVOLTAGE
52
GPIO053GPIO154GPIO255GPIO356GPIO457GPIO558GPIO659GPIO7
60
CDSVRST
5
ATTENTION
VA
ET CALIBRATION COMME INDIQUE.
D'INCENDIE, REMPLACER UNIQUEMENT
PERMANENTE CONTRE LES RISQUES
AFIN D'ASSURER UNE PROTECTION
PAR UN FUSIBLE DE MEME TYPE
AGAINST FIRE HAZARD, REPLACE
VA
FOR CONTINUED PROTECTION
AND RATING INDICATED.
ONLY WITH FUSE OF SAME TYPE
CAUTION
THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY.
REPLACE ONLY WITH PART NUMBER SPECIFIED.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
ELECTROLYTIC CAPACITORS ARE IN uF/WV.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030 3pF 330 33pF 331 330pF 333 0.033uF
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
NOTE
( )
6
6
6
2.5
5
5
6
U01 : MAIN CIRCUIT PC BOARD NAAR-8645
U02 : CONNECTOR
PC BOARD NAETC-8736
Page 9
DX-7555
DACLRCK
DACDATA
DACBCK
VDDC1.8V/2.5V
VDSPD3.3V
DOUT
ACM_H
ACM_L
DIS_COM+5V
VDDC1.8V/2.5V
HP_-B
VDSPD3.3V
+B_R
+B
+B_L
D+3.3V
ACLOCKADJ
ACLOCKADJ
CDSVRQ
DAC_SDO
DAC_RST
CDSVRQ
EXCLK
SO_1
SI_1
CL_1
REQ_1
ACLOCKADJ_1
SYS_+5V
CDRESET
REQ
SYS_GND
CDSVRQ
CDSVAK
CDSVRST
BACK_UP_EV5V
K0_1
REMO_IN_1
INT_K0_1
test
CDSVRE
RST
RI_OUT
RST
RI
HP_MUTE
HP_OUTR
MUTE_-B
AMUTE
MUTE_R
HP_MUTE
EV_GND
EV+5V
BACK_UP_EV5V
STBY_LED
REMO_IN_1
P-SUPPLY
MUTE_L
DIS_COM+5V
FL_AC_L
FL_AC_H
FL_AC_H
FL_AC_L
DIS_COM+5V
VCONT_MPU
VD+3.3V
DSP_+8VVSW8V
XTAI
-B_R
test
REQ_1
SO_1
SI_1
CL_1
OP_+8V
K0_1
BACK_UP_EV5V
P-ON
EV
EV_GND
SUB_RST
SUB_CL
SUB_SI
SUB_SO
EV_GND
SUB_REQ
REMO_IN
LED
K0
INT_K0
-VDISP
-VDISP_GND
FLAC1
FLAC2
-B
-Vdisp_C
STBY_LED
DAC_LAC
DAC_CLK
CDSVCK
CDSVSI
CDSVSO
AC_-VDISP
AC_-VDISP
CLK2V
DAC_SCLK
DIS_COM+5V
EV+5V
CLK3.3V
MUTE_+B
OP_+8V
OP_+8V
OP_+8V_1
MUTE_+B_1
MUTE_+B
A+5V
MECHA_+B
SUBRST_1
SUBRST_1
GNDD
GND_CPU
DSP_GND
DIS_GND
GNDD
MUTEGND
MUTEGND
SUB_GND
-VDISP_GND_1
DIS_GND
GNDD
GNDD
GNDM
DGND
DSP_GND
DIS_GND
GND
GND
P_GND
EV_GND_1
EV_GND_1
GNDM
DIS_GND
-VDISP_GND_1
MUTE_GND
APGND
DGND
APGND
MUTE_GND_1
-VDISP_GND_1
GNDM
INT_K0_1
MUTE_GND_2
MUTE_GND_2
MUTE_GND_3
+5V
P-ON
K0_1
DAC_LAC
DAC_RST
DAC_SDO
DAC_CLK
RI_IN
P-OFF_1
P-OFF
P-OFF
-B_HP
+B_HP
AOUTL
AOUTR
HP_+B
A_GND
HP_OUTL
HP_-B
P_GND
JL0002
JL0001
JL0004
JL0003
SERVO_+5V
Back up circuit
RI
no saving mode
CXD3014ARCXD3014R
R8057
R8060
0 ohm
0 ohm
NC
NC
R2036
0
C2011
104Z
C2016
104Z
R2014
22
R2015
22
C2028
104Z
R2028
10K
R2026
0
P7002
1
2
3
4
5
6
7
8
C9021
470/16
+
C4011
332
C8009
104Z
R8047
100
1K
1K
1K
C8008
104Z
C9025
104J
5
R4066
560K
P001B
12345
6
Q8003
RN1407
Q8004
S-80145CLMC
3
NC
2
VSS
1
DS5VCC
4
OUT
Q8002
BR93L56F-WE2
5
DI
6
DO
7
GND
8
NC1NC
2
Vcc
3
CS
4
SK
PCO83SRAMVSS184SRAMVDD185SRAMSTB86DVDD187DVSS188TEST189DATA90CLOK2
91
VSS2
92
VDD2
93
TEST2
94
TEST3
95
TEST4
96
TEST5
97
TEST6
98
DVSS2
99
DVDD2
100
IOVDD2
101
DOUT
102
TEST
103
TEST
104
IOVSS2
105
PLLAVD
106
PLLAVS
107
XVSS
108
XTAO
109
XTAI
110
XVDD
111
AVD4
112
AOUT1
113
VREFL
114
AVS4
115
AVSS
116
VREFR
117
AOUT2
118
AVD5
119
IOVDD3
120
IOVSS3
1
LRCK
2
LRCKI3PCMD
4
PCMDI
5
BCK
6
BCKI
7
XTACN
8
XRST
DVSS3
Q4005
NE5532AP
6
5
7
Q4002
NE5532AP
3
2
1
P2005
8
NC
7
Vpp/test
6
EV5V
5
RST
4
CDSVCK
3
CDSVSI
2
CDSVSO
1
CPUGND
Q7003
2SD1644
Q7002
2SD1644
Q9005
UPC29M33HF
2
G
1
I
3
O
Q2005
MPD120N25T1B
1
O3I
2
G
D9005
RL1N4003
D9006
RL1N4003
D9004
RL1N4003
C8002
2.2/50
+
D8002
D9001
UDZS4.7B
D8008
D8003
UDZS5.6B
Q8001
RN2403
D8001
D7001
RL1N4003
C7002
104J
R8011
470
L8001
BLM21B222SPT
P3101
RI_JACK
3
2
1
4
P9033 From_S_PT
1
2
3
4
5
P9001
For_M_PT
1
2
3
4
5
6
7
P703
For_Freq_Measure
2
1
C8011
0.1F
+
D8007
D8006
C2007
104Z
C9007
C9009
C2054
C4027
104J
C4025
104J
C4026
104J
Q4008
2SD655
Q4006
2SD655
Q4009
2SD655
Q4007
2SD655
3 2
C8013
104Z
C8003
104
C9016
C9004
C9022
104Z
1K
C8012
104Z
C2001
473
C8004
473
C8005
473
C9011
474
C9010
474
C8014
33P
C8016
33P
C8015
33P
C8019
33P
C8018
33P
C8022
33P
C9014
22000/50
+
C4006
102
Q4003
NE5532AP
6
5
7
C4009
102
C4028
102
C4008
102
C4029
102
C4019
182
C4010
332
C2039
100/16
+
C2038
104Z
+
C2050
100/16
+
C9018
1000/16
+
C9003
330/16
+
C9017
330/16
+
C9020
470/16
+
C7001
470/16
+
C8010
2.2/50
+
C8024
2.2/50
+
C2010
22/50
+
C2015
22/50
+
C2012
47/50
+
C2017
47/50
+
R1048
560
R1054
1K
R1071
0
R2006
47K
R2001
560
R2005
R2002
1K
R2013
22
R2035
R2031
0
4.7K
R2066
0
R20670R20680R2069
0
R4002
R4006
1.2K
R4004
1.2K
R4001
R4003
1.2K
R4005
1.2K
R4007
R4008
R4010
2.4K
R4012
2.4K
R4011
2.4K
R4009
2.4K
R4013
10K
R4015
10K
R4014
10K
R4016
10K
C4017
C4016
R4020
22(1/2W)
R4017
22(1/2W)
R4018
22(1/2W)
Q4003
NE5532AP
2
3
4
1
8
R4021
1.5K
R4023
22K
Q4002
NE5532AP
5
6
8
7
4
R4022
1.5K
R4024
22K
R4025
22K
R4026
22K
R4028
22K
R4027
22K
R4029
22K
R4031
1.5K
R4030
22K
R4032
1.5K
Q4004
NE5532AP
5
6
8
7
4
R4034
1.5K
R4035
R4037
R4039
4.7K
R4041
R4043
470K
R4044
470K
R4045
10K
R4046
10K
R4047
220
R4051
220
R4052
220
R4048
220
R4050
10K
R4049
10K
R4055
560K
R4056
560K
R4054
220K
R4053
220K
R4057
0
R4065
0
R4058
0
R4067
220K
R4068
0
R7011
10k
R7010
10k
R8005
0
R80060R8007
0
R8002
100
R8010
10K
R8004
220K
R8024
0
R8025
0
R8053
10K
R8052
10K
R8015
0
R8014
0
C8023
33P
R8017
0
R8012
10K
R8028
560
R8029
560
R8030
560
R8027
560
R8032
1K
R8031
1K
R8034
1K
R8036
10K
R8049
R8048
10K
R8046
1K
R8059
47K
R8057
R8050
1K
R8055
R8056
0
R8058
R8054
10K
R8061
R8060
R9008
0
R9006
33(1W)
R9001
22(1/2W)
R9003
22(1/2W)
C9013
22000/50
+
R9018
0
C4012
470/16
+
C4013
470/16
+
C4015
470/16
+
Q4001
WM8740
1
LRCIN2DIN3BCKIN4MODE8X5SCLK6DIFFHW7DGND8DVDD9AVDDR10AGNDR11VMIDR12VOUTRP13VOUTRN14AGND
15
AVDD
16
VOUTLN
17
VOUTLP
18
VMIDL
19
AGNDL
20
AVDDL
21
ZERO
22
RSTB
23
CSBIWO
24
MODE
25
MUTEB
26
MD/DM027MC/DM1
28
ML/I2S
Q8006
NE5532AP
7
6
5
Q9006A
78M56
3
O
2
G
1
I
R8008
100
D8004
R8020
0
R8062
10K
R8013
0
C4005
47/50
+
C4023
100/50
+
C4030
334
R8051
100
Q4013
2SA1162-Y
Q4011
2SA1162-Y
Q4010
2SA1162-Y
C4024
104J
C4022
100/50
+
C4018
182
R8001
47K
C2022
223
R2074
0
C2024
104Z
R1056
1k
R8003
220
C8020
33P
C8021
33P
R4038
R4040
4.7K
C4014
470/16
+
R4019
22(1/2W)
C8006
104Z
C8001
104Z
R2059
0
R2042
22
Q4005
NE5532AP
2
3
4
1
8
R4033
1.5K
C4007
102
C8017
103
R7005
100
R7002
100
R7003
100
R7004
100
R7001
100
R7009
100
R7006
100
R2075
150
D9003
RL1N4003
C9023
470/16
+
R9010
10K
R9020
10K
R9023
1K(1W)
R9021
10K
R9017
10K
R9024
NC
Q8006
NE5532AP
814
3
2
R8026
100
R8065
NC
Q9006B
S-812C56AUA-C3E-T2
3
O
1
G
2
I
D8005
D9002
D5SBA20
134
2
D9007
RL1N4003
D9009
R9007
1k
Q9003
78M05
3
O
2
G
1
I
P7001
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
P3002B
1
2
3
R2063
33
R2064
33
Q2006
2SA1162
C2065
104
C2066
100/16
+
R8021
0
C4003
47/50
+
C4031
100/50
+
Q9004
78M08
3
O
2
G
1
I
R8009
0
R8064
0
C2055
22/6.3
+
C8007
104Z
C4004
470/16
+
C2068
223
X8001
12.5MHz
C4032
474
J1501
R4036
J1502
J1503
Q4004
NE5532AP
3
2
1
R4042
C4020
100/50
+
C4021
100/50
+
J1504
R9022
0.22(1W)
R9009
0
J1505
D7002
RL1N4003
J1507
J1506
C7003
330/16
+
C9024
2200/25
+
C4002
474
R8019
0
R8018
0
R7008
0
R7007
0
R8023
0
R8022
0
J1508
C7004
330/16
+
Q9002
UPC29M33HF
3
O
2
G
1
I
Q7001
78M05
1
I3O
2
G
P4001
PINJACK
Val
4
2
1
3
7
5
6
C9019
Q8005
61
EXILIN
62
POFF
63
SYSIN
64
CDSVRE
65
INTK0
66
EXIRIN
67
VSS0
68
VDD1
69
X2
70
X1
71
TEST/VPP
72
NC
73
GND
74
VDD0
75
AVDD
76
MODEL
77
GPANI1
78
K0
79
GPANI3
80
GPANI4
1
GPANI52MODEL13GPANI74AVSS5ACLKADJ6NC7AVREF18GPANI9NC10GPANI11CDSVSO12CDSVSI13CDSVCK14EXCLK15SUBRST16SUBSO17SUBSI18SUBCL19SUBREQ20NC
21
CDSVRST
22
CDSVAK
23
CDSVRQ
24
NC
25
NC
26
NC
27
CDIC_SEL
28
NC
29
NC
30
NC
31
NC
32
NC
33
VSS1
34
STBYLED
35
NC
36
DACRST
37
NC
38
DACLAC
39
DACSDO
40
DACCLK
41
NC42NC43NC44NC45NC46NC47NC48NC
49
SYSOUT
50
EEPROMCS
51
EEEPROMCLK
52
EEPROMDI
53
EEPROMDO
54
ACLKSTP155ACLKSTP2
56
ACLKSTP3
57
ACLKSTP4
58
ACLKSTP5
59
P-ON
60
RST
Q8005
MPD78F4225GC
61
EXILIN
62
POFF
63
SYSIN
64
CDSVRE
65
INTK0
66
EXIRIN
67
VSS0
68
VDD1
69
X2
70
X1
71
TEST/VPP
72
NC
73
GND
74
VDD0
75
AVDD
76
MODEL
77
GPANI1
78
K0
79
GPANI3
80
GPANI4
1
GPANI52MODEL13GPANI74AVSS5ACLKADJ6NC7AVREF18GPANI9NC10GPANI11CDSVSO12CDSVSI13CDSVCK14EXCLK15SUBRST16SUBSO17SUBSI18SUBCL19SUBREQ20NC
21
CDSVRST
22
CDSVAK
23
CDSVRQ
24
NC
25
NC
26
NC
27
CDIC_SEL
28
NC
29
NC
30
NC
31
NC
32
NC
33
VSS1
34
STBYLED
35
NC
36
DACRST
37
NC
38
DACLAC
39
DACSDO
40
DACCLK
41
NC42NC43NC44NC45NC46NC47NC48NC
49
SYSOUT
50
EEPROMCS
51
EEEPROMCLK
52
EEPROMDI
53
EEPROMDO
54
ACLKSTP155ACLKSTP2
56
ACLKSTP3
57
ACLKSTP4
58
ACLKSTP5
59
P-ON
60
RST
R8016
2.7K
R8066
10K
2.2u
L2003
2.2u
L2002
2.2u
D9008
RL1N4003
Q4012B
NE5532AP
5
6
7
4
R4059
10K
R4063
10K
R4064
10K
R4060
10K
R4062
10K
R4061
10K
Q4012A
NE5532AP
2
3
8
1
2.5
3.3
3.3
2.5
3.3
3.3
8
-13
-5
4.7
8.0
5.0
3.3
Page 10
SCHEMATIC DIAGRAMS-2
DX-7555
A
1
2
3
4
5
BCDEFGH
P901
AS-CEE
S8004
4
3
2
1
T.F.
T902
NPT1451A
10
11
12
13
14
15
16
8
9
R9103
2.2(1W)
R9102
1.0(1W)
R9101
1.0(1W)
JL9001
P7002
Q81016-BT-289GK
F11 1
F12 2
F21 45
F22 44
G1 41
G10 32
G11 31
G12 30
G13 29
G2 40
G3 39
G4 38
G5 37
G6 36
G7 35
G8 34
G9 33
P1 19
P10 10
P11 9
P12 8
P13 7
P14 6
P15 5
P2 18
P3 17
P4 16
P5 15
P6 14
P7 13
P8 12
P9
11
S9001
Q9002
NC
OUT
VDD
VSS
VSS2
JL9033
RL9001
R9202
0.47
R9203
0.47
L9001
NCH3564
1
23
4
T9001
NPT-1519GQ
1
4
5
6
8
9
P9013A
P9013C
P9003B
P9004C
P9022
P9011
P9013
C9114
104
C9113
104
C9111
474
C9110
104
C9106
104
C9108
474
C9104
224
D9106
RL1N4003
D9108
RL1N4003
D9105
D9104
D9103
D9102
RL1N4003
D9101
D9107
UDZS5.1B
D8502
UDZS5.6B
C9112
2.2/50
C9109
6800/16
C9105
47/50
C8504
C9107
472
C9103
472M
C9102
472M
C9101
472M
C9115
472M
C8503
273
Q9001
DTC123JS
R4102
22
R4101
22
R9206
18K
R9204
8.2K
R9205
27K
R9201
10
R8504
470
R8801
2.7K
R8800
2.7K
R8802
4.7K
R8803
4.7K
R8903
0
R8902
0
R8600
R8508
100K
R8503
470
R8201
390
R8101
390
R8102
470
47K
R8601
0
R8707
R8606
47
R8605
R8603
47
R8604
47
R8602
47
S8202
S8201 S8102
S8103
S8101
Q8601
-VDISP60
10G
11G
12G
13G
14G
1G
2G3G4G5G6G7G8G
9G
AVDD 24
AVSS18
DIGI_OFF_LED 28
DSC_IND_LED1
29
DSC_IND_LED2
30
DSC_IND_LED3
31
FIP13
FL_HSW 26
IC 5
INTP_015
I_P2212
I_P2311
K0 22
K1
21
K220
K319
P1
P1053
P1152
P1251
P1350
P1449
P15
48
P16
47
P17
46
P18
45
P1944
P2
P2043
P21
42
P22
41
P23
40
P2439P2538P2637P2736P2835P29 34
P3
P30
33
P31
32
P36
P4
7170696867
807978777675747372
66
6463626561
P558
P657
P756
P855
P954
SO_313
SUBCL 7
SUBREEST 6
SUBREQ10
SUBSI 8
SUBSO 9
TI17
TRAYBRIGHT16
TRAYLED2 27
TRAYLED_114
VDD1 1
VDD_0 25
VDD_259
VSS0 23
VSS1 2
X1 3
X2
4
FL_ON/OFF
JOG_B
JOG_A
KEY_0
KEY_1
KEY_2
P15
P14
P13
P12
P11
P10
P9
P15 SW-VP
P8 P14 LED_8
P7 P13 DSC_IND_LED3 SUBREQ SUBREQ
P6 P12 SUBREQ SUBSO SUBSO
P5 P11 SUBSO SUBSI SUBSI
P4 P10 SUBSI SUBCL SUBCL
P3 P9 SUBCL
P2 P8 SUBRSTIN SUBRSTIN SUBRSTIN
P1 P7
P6
P5 +B[SUB]
13G
12G
11G
10G
9G
8G
7G
6G
5G
4G
3G
2G
1G
F1_OUT F1_OUT
F2 F2
GND[SUB]
HP-B HP+BOUT
HP+B
HP-BOUT
HP-MUTE
HP-MUTEGND
P_ON
HP-R
SUB_GND HP-GND
HP-L
P_OFF
AS-JA
AS-UC-2
AS-CCC
NAETC-8653
NAPS-8648
NAPS-8646
NAPS-8647
NADIS-8650
PAUSE
STOP
FR
DISP
FF
J9103(R9104)
2.2(1/2W)
<MDC ONLY>
U06 : DISPLAY CIRCUIT PC BOARD NADIS-8650
U04 : POWER TRANSFORMER PC BOARD
NAPS-8647
U03 : POWER SUPPLY CIRCUIT PC BOARD
NAPS-8646
U09 : HEADPHONE AMP. PC BOARD
NAETC-8653
U05 : POWER SWITCH PC BOARD
NAPS-8648
Page 11
DX-7555
S8004
1452
3
R4103
20K
L4001
1
2345
6
Q4011
OPAMP
3
2
1
Q4011
OPAMP
5
8
6
4
7
P4001
C4121
102
C4111
C4109
104
C4103
102
C4104
102
C8506
NC
D8506
NC
JL4001B
P8003B
JL4001A
P8003A
P8001
Q8501
2SD1664
Q8502
2SD1664
D8502
UDZS5.6B
D8501
UDZS27B
Q8503
2SA950-Y
X8601
12.50MHZ
C4101
220/16
C4102
220/16
C4106
47/50
C4105
47/50
C8601
100/6.3
C8507
NC
C8501
100/50
C8101
47/6.3
C8502
100/50V
C4108
102
C4107
102
C8102
104
C8503
C8806
104
C8805
220
C8804
220
C8803
220
C8702
220
C8701
220
C8602
104
U8001
GP1UM27XK0VF
C8401
104
C8402
104
C8103
104
Q8401
RN1404
Q4002
RN1441
Q4003
RN1441
D8401
SML-512UWT88
22
22
R8402
NC
R8401
1.8K
R8403
NC
R4113
390
R4112
390
R4111
220K
R4110
220K
R4107
4.7K
R4105
10K
R4109
10K
R4104
10K
R4106
4.7K
R4108
10K
R8504
470
R8702
10K
R8701
10K
R8704
10K
R8706
10K
R8705
10K
R8703
10K
R8708
2.7K
R8709
2.7K
R8800
2.7K
R8991
0
R8206
0
R8600
1M
R8508
100K
R8503
470
R8116
0
R8117
47
R8111
390
R8112
470
R8502
10K
R8501
10K
R8506
220K
R8507
47K
R8505
4.7K
R8601
0
R8707
10K
R8605
47
R8603
47
S8002
S8003
S8001
FL_ON/OFF
SW-VP
VP_ACH
F1_IN
F2
GND
KEY_0_EV_CHK
KEY_0_EV
STABY_LED
+5EV
REMSENS
FL_ON/OFF
F1_IN
KEY_0
JOG_A
JOG_B
+5EV
KEY_1
STABY_LED
GND
REMSENS
KEY_0_EV
KEY_0_EV_CHK
KEY_0_EV
RNF
ROUT
R-IN
HP-GND
HP-BOUT
HP-GND
HP-MUTE
HP-MUTE
HP-MUTE GND
HP-R
HP-L
L-IN
LOUT
LNF
RED
NAETC-8652
NAETC-8651
STANBY_LED
PLAY
OP/CL
STANBY
ENTER
DOWN
UP
MAIN_MICON
U08 : HEADPHONE JACK PC BOARD
NAETC-8652
U07 : STANDBY LED PC BOARD
NAETC-8651
Page 12
DX-7555
A
SCHEMATIC DIAGRAMS-3
1
2
U10 : SUPER PRECISION CLOCK PC BOARD NADG-8725
VD+3.3V
6
GNDD
5
CLK2V
4
CLK3.3V
3
GNDD
2
VCONT_MPU
1
P001 Val
BCDE
TP1
TP6
GND
L001 10u
R001
Val
105Z
C001
C002
220/6.3
Q002
NJM2373AF
R002
5
NC
1
CLK3.3V
R008
R006
3
Val
1
R007
TP3
Val
2
Val
VDD+3.3V
VDD+3.0V
Val
R009
Val
R010
R012
2.2KF
VCTRL
R011
Val
TP5
R013
C004
2.2KF
105Z
X001
4
1
C005
3
Vcc
Output
DSA535SB
Vcont2GND
102J
R015
470
C006
103K
VAL
C008
R014
22K
1
2
3
4
GND
TC7WZU04FU
Q001
R003
10KF
12KF
R004
VDD+3.0V
C003
10/16
18KF
R005
47
4
NC
2
3
VDDA+3.3V
TP4
16.9344M
8
VD
7
6
5
TP2
C007
105Z
VAL
C009
470
R016
TP7
CLK2V
E001
3
DX-7555
4
Page 13
DX-7555
A
PRINTED CIRCUIT BOARD VIEWS-1
U01
1
2
MAIN CIRCUIT PC BOARD (NAAR-8645)
Component side
BCDEFGH
3
4
U02
5
CONNECTOR PC BOARD (NAETC-8736)
Component side
Page 14
DX-7555
Page 15
DX-7555
A
PRINTED CIRCUIT BOARD VIEWS-2
U01
1
2
MAIN CIRCUIT PC BOARD (NAAR-8645)
Soldering side
BCDEFGH
3
4
5
Page 16
DX-7555
Page 17
C8503
C8602
C8701
C8702
C8803
C8804
C8805
C8806
D8501
D8502
Q8501
Q8502
R8111
R8112
R8116
R8117
R8101
R8102
R8201
R8206
R8501
R8502
R8503
R8504
R8505
R8506
R8507
R8601
R8602
R8603
R8604
R8605
R8606
R8607
R8701
R8702
R8703
R8704
R8705
R8707
R8906
R8904
R8905
R8508
R8802
R8803
R8907
C8101
C8501
C8501
C8502
C8502
C8506
C8507
C8601
D8506
P8001
Q8503
S8001
S8002
S8003
S8004
S8004
S8101
S8102S8103
S8201
S8202
J1002
J1006
J1003
J1004
J1005
J1038
J1007
J1008
J1009
J1010
J1011
J1012
J1013
J1015
J1040
J1016
J1042
J1027
J1029
J1030
J1031
J1032
J1034
J1035
J1036
J1014
J1037
PLAY STOP
PAUSE
OP/CL
FF
FR
DISP
STANDBY
NCDIS-8650
25138650D
2
J1001
J1039
J1025
J1026
J1041
2
2
2
2
22
22
27
20
7
30
22
25
25
30
20
20
20
20
30
7
15
25
7
20
15
7
15
7
12
PRINTED CIRCUIT BOARD VIEWS-3
(FROM SOLDERING SIDE)
DX-7555
A
1
2
3
4
5
BCDEFGH
U06
DISPLAY CIRCUIT PC BOARD (NADIS-8650)
Component side
Soldering side
Page 18
C8102
C8103
Q86
01
Q
8
601
R8116
R8600
R8704
R8705
R8706
R8707
R8708
R8709
R8800
R8801
R8903
R8902
R8901
1
6
1
21
41
C8604
C8504
P8003A
Q8101
Q8101
U8001
U8001
X8601
J1017
J1018
J1019
J1020
J1021
J1022
J1023
J1024
J1028
Q8101A
Q8101A
Q8101B
Q8101B
U8001AU8001A
30
15
15
7
27
27
DX-7555
No PC board view.
Look over the actual PC board on hand.
U10
SUPER PRECISION CLOCK PC BOARD (NADG-8725)
Page 19
DX-7555
A
PRINTED CIRCUIT BOARD VIEWS-4
(FROM SOLDERING SIDE)
U03
1
2
POWER SUPPLY CIRCUIT PC BOARD (NAPS-8646)
3
ADD_+B
P-OFF
GND
P-ON
C9114
C9113
J9002
R9206
R9205
R9204
+B
J9005
C9112
D9106
D9108
J9001
12
7
C9104
J9007
Q9001
JL9033
T9001
C9105
C9105
C9109
R9202
NCPS-8646
25138646
J9004
R9201
C9108
7
J9006
D9102
J9003
C9109
D9103
T9001
12
J9008
7
C9110
D9104
C9111
R9203
BCD
E012
E9001
Q9002
C9106
D9105
D9107
7
D9101
C9102
L9001
C9103
P-SW
T-2
P9013A
P-SW
P9022A
WHIT
T902
WHIT
L9001
T902
U05
POWER SWITCH PC BOARD
(NAPS-8648)
S9001
S9001
NCPS-864825138648
C9107
J9102
R9102
RL9001
RL9001
C9101
AC-GAC-H
P9011
AC-IN
223 OR6
P9022B
T-2
P9013C
AC-G
E011
Component side Soldering side
J9103
R9103
3
4
U04
5
POWER TRANSFORMER PC BOARD (NAPS-8647)
J9101
R9101
JL9001
3
25138647
NCPS-8647
Component side
C9115
AC-G
P9013
AC-H
AC-H
AC-G
3
P9022
AC-G AC-H
Component side
Page 20
DX-7555
A
PRINTED CIRCUIT BOARD VIEWS-5
(FROM SOLDERING SIDE)
U07
1
2
U08
3
STANDBY LED PC BOARD (NAETC-8651)
P8003B
0
D8401
NCETC-8651
Component side Soldering side
HEADPHONE JACK PC BOARD (NAETC-8652)
C4108
C4111
C4107
2
NCETC-8652
E4103
JL4001B
E4102
BCD
C8401
L4001
6
L4001
J4007
J4008
1
P4101
25138652
C8402
Q8401
P4101
C4121
R8402
R8403
R8401
E4101
Component side
U09
4
5
HEADPHONE AMP. PC BOARD (NAETC-8653)
R4102
P7002
3
J4001
C4103
NCETC-8653
25138653
C4109
J4003
R4113
C4105
20
Q4111
J4006
R4101
Q4111
JL4001A
R4112
C4106
J4004
J4005
C4101C4102
J4002
C4104
R4103
R4109
R4104
R4105
R4106
R4107
R4114
Q4113
R4111
R4115
Q4112
R4110
R4108
Component side Soldering side
Page 21
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-1
Q2002 : BA5947FP (4-ch BTL DRIVER)
BLOCK DIAGRAM
DX-7555
15
16
17
18
19
20
21
22
23
24
25
26
10k
50k
100k
50k
D
D
D
D
POW
VCC
(ch3, 4)
50k
R
R
F
PIN3
MUTE
INTER
FACE
100k
10k
19k
F
LEVEL
SHIFT
POW
VCC
50k 50k
POW
VCC
50k 50k
PIN26
6.5k
Vref
Vref
THERMAL
SHUTDOWN
F
INTER
FACE
D
14
D
13
D
12
D
11
POW
VCC
(ch1, 2)
R
F
INTER
FACE
R
F
SW
10
9
8
R
7
F
6
5
4
3
TERMINAL DESCRIPTION
No. PIN NAME DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OPIN-
OPIN+
SW
CH1FIN
CH1RIN
CH2FIN
CH2RIN
GND
VREFIN
POWVCC
CH2OUTR
CH2OUTF
CH1OUTR
CH1OUTF
Operational amplifier negative input terminal
Operational amplifier positive input terminal
CH4 input selecting switch terminal
CH1 PWM forward input terminal
CH1 PWM reverse input terminal
CH2 PWM forward input terminal
CH2 PWM reverse input terminal
GND
Internal Vref voltage input terminal
Power part power supply voltage (CH1, 2)
CH2 reverse output terminal
CH2 forward output terminal
CH1 reverse output terminal
CH1 forward output terminal
27
28 1
Pre
Vcc
No. PIN NAME DESCRIPTION
CH4OUTR
15
CH4OUTF
16
CH3OUTF
17
CH3OUTR
18
POWVCC
19
MUTE
20
GND
21
CH3RIN
22
CH3FIN
23
CH4IN
24
CH4CAPA
25
OUTVREF
26
OPOUT
27
PREVCC
28
2
CH4 reverse output terminal
CH4 forward output terminal
CH3 forward output terminal
CH3 reverse output terminal
Power part power supply voltage (CH3, 4)
Mute terminal
GND
CH3 PWM reverse input terminal
CH3 PWM forward input terminal
CH4 input terminal
CH4 external CAPA connection terminal
CH4 external reference voltage input terminal
Operational amplifier output terminal
Pre-part power supply voltage
Page 22
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-2
Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and
Digital Servo + Digital High & Bass Boost + CODEC) -1/4
BLOCK DIAGRAM
DMAC
XY-Memory
DX-7555
IREQ
ACK
XLAT2
REQ
DATA2
CLOK2
DOUT
PCMD
BCK
LRCK
BCKI
PCMDI
LRCKI
VREFL
AOUT1
VREFR
AOUT2
LPF LPF
Timer0 Timer1 Timer2
CPU Interface
Bass
DAC
ARC CORE
Registers
PCM Interface
Boost
Block
Selector
DMP
SRC
APB_ARB
Memory
OUT
Digital
I-Cache
APB
Interface
ECC
CD Interface
CD Signal
DMACA
Memory
Magic Gate
Processor
Block
SRAM
Sequencer
Memory Control System
CDDSP
32K
RAM
D/A
Interface
EFM
ROM/RAM
XRST
TEST1
TRST
XTAO
PLL1/PLL2
Generator
Digital PLL
XTACN
XTAI
VCTL
VPCO
XPCK
PCO
FILI
FIFO
CLTV
CPU + DSP
Clock Generator
CODEC (ATRAC3, ATRAC-X, MP3)
Clock
Demodulator
DATA
XLAT
CLOK
SENS
SCOR
LOCK
MDP
C2PO
WFCK
XUGF
GFS
COUT
SSTP
CPU Interface
SERVO
Interface
FOK
MIRR
DFCT
SERVO Block
FOK
MIRR
DFCT
SFDR
SRDR
PWM
Generator
TFDR
TRDR
FFDR
FRDR
SERVO DSP
A/D Converter
TEI
FEI
Sequencer
Servo Auto
Digital CLV
TE
F
E
TEO
FEO
FE
Error
Corrector
ASYO
ASYI
BIAS
RFACI
Corrector
Sub Code
Processor
Asymmetry
RFACO
AMP
RF amp Block
SUM
VC
A
B
C
D
VC
EQ
ATT
APC
RFC
EQ_IN
AC_SUM
RFDCO
LD
PDSENS
PD
Page 23
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-3
Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and
Digital Servo + Digital High & Bass Boost + CODEC) -2/4
TERMINAL DESCRIPTION
Pin No. Pin name I/O Description
LR clock output.
O
O
O
---
O
I/O
O
---
---
---
O
O
O
O
O
O
O
---
I/O
---
---
I/O
I/O
I/O
---
---
---
I/O
O
---
O
O
LR clock input.
I
PCMD data output.
PCMD data input.
I
BCK data output.
BCK data input.
I
Oscillation circuit control. Self-oscillation when high, oscillation stop when low.
I
System reset. Reset when low.
I
Internal digital GND.
ARC Interrupt to microprocessor.
CPU I/F ARC(CLK)
I
CPU I/F ARC(DATA)
Codec latch signal.
I
CPU I/F ARC (REQ).
I
CPU I/F ARC (ACK).
CDDSP control latch signal.
I
Internal digital power supply.
Internal digital GND.
Internal digital power supply.
SENS output to CPU.
WFCK output.
XUGF output.
Output MNT0, RFCK, SOUT by command switch.
XPCK output.
Output MNT1, SOCK by command switch.
GFS output.
Output MNT2, XROF, XOLT by command switch.
C2PO output.
Output MNT3, GTOP by command switch.
High output when the subcode sync, S0 or S1, is detected.
Digital power supply.
Track number count signal input/output.
Internal digital GND.
Internal digital power supply.
Mirror signal input/output.
Defect signal input/output.
Focus OK signal input/output.
Internal digital GND.
Internal digital power supply.
Internal digital GND.
GFS is sampled at 460Hz; when GFS is high, this pin outputs a high signal. If GFS
is low eight consecutive samples, this pin outputs low. Or input when LKIN = "1".
Spindle motor servo control output.
Disc innermost detection signal input.
I
I/O digital GND.
Sled drive output.
Sled drive output.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
1
LRCK
2
LRCKI
3
PCMD
4
PCMDI
5
BCK
6
BCKI
7
XTACN
8
XRST
DV
SS3
9
IREQ
CLOK
DATA2
XLAT2
REQ
ACK
XLAT
DD3
DV
SS8
DV
DD8
DV
SENS
WFCK
XUGF
XPCK
GFS
C2PO
SCOR
DD4
DV
COUT
SS9
DV
DD9
DV
MIRR
DFCT
FOK
SS4
DV
DD5
DV
SS5
DV
LOCK
MDP
SSTP
SS1
IOV
SFDR
SRDR
DX-7555
Page 24
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-4
Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and
Digital Servo + Digital High & Bass Boost + CODEC) -3/4
TERMINAL DESCRIPTION (Continued)
Pin No. Pin name I/O Description
Tracking drive output.
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
TFDR
TRDR
FFDR
FRDR
DD1
IOV
AVD1
AVS1
E
F
TEI
TEO
FEI
FEO
VC
A
B
C
D
AVD2
RFDCO
PDSENS
AC_SUM
EQ_IN
LD
PD
RFC
AVS2
RFACO
RFACI
AVD3
BIAS
ASYI
ASYO
VPCO
VCTL
AVS3
CLTV
FILO
FILI
PCO
SS6
DV
DVDD6
SRAMSTB
DD1
DV
DVSS1
O
O
O
O
---
---
---
O
O
I/O
---
I/O
O
O
---
O
---
O
O
---
O
O
---
---
---
---
Tracking drive output.
Focus drive output.
Focus drive output.
I/O digital power supply.
Analog power supply.
Analog GND.
E signal input.
I
F signal input.
I
Tracking error signal input to DSSP block or F input.
I
Tracking error signal output from RF amplifier block.
Focus error signal input to DSSP block or A input.
I
Focus error signal output form RF amplifier block.
Center voltage output from RF amplifier block.
Center voltage input to DSSP block by command switch.
A signal input.
I
B signal input.
I
C signal input.
I
D signal input.
I
Analog power supply.
RFDC signal output.
RFDC signal input to DSSP block by command switch.
Reference voltage pin for PD.
I
RFAC summing amplifier output.
Equalizer circuit input.
I
APC amplifier output.
APC amplifier input.
I
Equalizer cut-off frequency adjustment pin.
I
Analog GND.
RFAC signal output.
RFAC signal input or EFM signal input.
I
Analog power supply.
Asymmetry circuit constant current input.
I
Asymmetry comparator voltage input.
I
EFM full-swing output. (Low = V
Wide-band EFM PLL charge pump output.
Wide-band EFM PLL VCO2 control voltage input.
I
Analog GND.
Multiplier VCO1 control voltage input.
I
Master PLL (slave = digital PLL) filter output.
Master PLL filter input.
I
Master PLL charge pump output.
Internal digital GND.
Internal digital power supply.
Normally low.
I
Internal digital power supply.
Internal digital GND.
SS, High = VDD)
DX-7555
Page 25
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-5
Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and
Digital Servo + Digital High & Bass Boost + CODEC) -4/4
TERMINAL DESCRIPTION (Continued)
Pin No. Pin name I/O Description
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
TEST1
DATA
CLOK2
SS7
DV
DD7
DV
TEST2
TEST3
TEST4
TEST5
TEST6
SS2
DV
DD2
DV
DD2
IOV
DOUT
TEST
TES1
SS2
IOV
PLLAVD
PLLAVS
SS
XV
XTAO
XTAI
DD
XV
AVD4
AOUT1
VREFL
AVS4
AVS5
VREFR
AOUT2
AVD5
DD3
IOV
SS3
IOV
I/O
Test mode set.
I
CPU I/F ARC (DATA).
CPU I/F ARC (CLK).
I
Internal digital GND.
--Internal digital power supply.
--Test pin. Normally GND.
I
Test pin. Normally GND.
I
Open.
O
Test pin. Normally GND.
I
Test pin. Normally GND.
I
Internal digital GND.
--Internal digital power supply.
--I/O digital power supply.
--Digital Out output.
O
Test pin. Normally GND.
I
Test pin. Normally GND.
I
I/O digital GND.
--PLL cell power supply.
--PLL cell GND.
--Master clock GND.
--Crystal oscillation circuit output.
O
Crystal oscillation circuit input.
I
Master clock power supply.
--Analog power supply.
--Lch analog output.
O
Lch reference voltage.
O
Analog GND.
--Analog GND.
--Rch reference voltage.
O
Rch analog output.
O
Analog power supply.
--I/O digital power supply.
--I/O digital GND.
---
DX-7555
Page 26
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-6
Q4001 : WM8740 (24-BIT DAC) -1/2
BLOCK DIAGRAM
DX-7555
Page 27
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-7
Q4001 : WM8740 (24-BIT DAC) -2/2
TERMINAL DESCRIPTION
DX-7555
Page 28
FL TUBE VIEW
RANDOM
MEMORY
TOTAL
REMAIN
CD
PROGRESSIVE
MP3
DVD -AUDIO SACD V CD VIDEO OFF
TITLE GROUP
TRACK CHP
TOTAL
REMAIN
GU I
PBC RANDOM MEMORY
D PRO LOGIC
PROGRAM
A-B
DVD
-AUDIO
SACD
VIDEO OFF
TITLE
CHP
GU I
PBC
D
PRO LOGIC
PROGRAM
PROGRESSIVE
MP3
GROUP
TRACK
V -B
A
Q8101 : HNV-13SS12T
DX-7555
11G
GUI
12G
Hp
13G 10G 9G 8G 7G 6G 5G 4G 3G 2G
a
j
f
h
g
m
n
e
r
p
d
Hp
b
k
c
Col
Col
1G
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
1G
a
h
k
b
f
m
g
c
e
r
p
n
d
(1G-10G)
2G
l
3G
a
h
j
k
b
f
m
g
c
e
r
p
n
d
col
4G
5G
a
h
j
k
b
f
m
g
c
e
e
p
n
d
a
h
j
k
b
f
m
g
c
e
r
p
n
d
col
6G
a
h
j
k
b
f
m
g
c
e
r
p
n
d
Hp
7G
a
h
j
k
b
f
m
g
c
e
r
p
n
d
8G
a
h
j
k
b
f
m
g
c
e
r
p
n
d
9G
10G
a
h
j
k
b
f
m
g
c
e
r
p
n
d
a
h
k
b
m
g
c
e
p
n
d
Hp
a
h
j
f
r
j
k
b
f
m
g
c
e
r
p
n
d
11G 12G
GUI
RANDOM
13G
Page 29
ADJUSTMENT PROCEDURE
ADJUSTMENT OF MASTER CLOCK FREQUENCY
[When]
1. Exchange super precision clock PC board ass'y (NADG-8725).
2. Exchange IC X001 (Crystal), IC Q9005 (MPC29M33HF), and IC Q8005 (Main microprocessor).
[Procedure]
1. Connect the frequency counter to the test point P703 on main circuit PC board (NAAR-8645).
2. Press the POWER button to turn on the unit.
3. Wait for 3 minutes. (Heat running)
4. Press and hold down the STOP [ ] button, then press the FF (fast forward) [ ] button. All segments light up.
5. Press the STOP [ ] button, after "NO KEY" is displayed.
6. Press and hold down the PLAY [ ] button, then press the DISPLAY button.
FL display
7. Operate the UP/DOWN (JOG) dial so that the reading of frequency counter becomes 16.934400 MHz +1 / -1 Hz.
FL display
( + 00 )
( + 00 )
UP dial (JOG)
--->
--->
DOWN dial (JOG)
( + 10 )
( - 10 )
Ex.
Ex.
DX-7555
8. Press and hold down the DISPLAY button, then press the PUSH TO ENTER (JOG) button.
FL display
UPDATING.. UPDATE OK
--->
9. Press the PUSH TO ENTER (JOG) button, after "NO DISC" is displayed.
10. Press the POWER button to turn off the unit.
11. Disconnect the frequency counter.
--- Top view --Main circuit PC board (NAAR-8645)
Frequency counter
GND
Test point
P703
"16.934400 MHz +1 / -1 Hz"
Page 30
PACKING PROCEDURE
DX-7555
A600 <R>
(L & R)
A802
x 2 pcs.
A606
A804
1 m
A805
80 cm
A801
A606
A606
A800
A806
A807
A808
A809
A810
A803
A602
(INNER)
A606
R
Right side
marking
A601
A606
C-777(S)
Front side
)
C-777(S
L
Left side
marking
Front side
A604
(OUTER)
A600 <L>
(L & R)
A608
5( )
DX-755
DX-7555( )
DX-7555( )
A607
A608
Page 31
DX-7555
ONKYO CORPORATION
Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN
Tel: 072-831-8023 Fax: 072-831-8124
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Tel: 201-785-2600 Fax: 201-785-2650 http://www.us.onkyo.com/
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Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/
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N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039
http://www.ch.onkyo.com/
HOMEPAG
http://www.onkyo.com/
E
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