XR-A550MD
23
A
B
C
D
5
7
8
5
7
8
E
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
1
2
3
4
1
2
3
4
5
6
7
16
15
14
13
12
11
10
8
9
1
2
3
4
5
1
2
3
4
5
1
3
2
1 2 3 4 5 6 7 8 9
10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1
2
3
4
1
2
3
4
5
14
13
12
11
10
6
7
8
9
1
2
3
4
5
14
13
12
11
10
6
7
8
9
VSSA
VDDA
VINL
VREFA
VINR
VADCN
VADCP
OVERFL
VDDD
VSSD
L3DATA
BCK
WS
DATAO
DATAI
TEST3
TEST2
AVSS
AVDD
VOUTR
VDDO
TEST1
REF
VDDA
PD
AMPO
AMPI
XI
VSSA
LOCK
VDD
S1
S2
M1
M2
VSS
CKO
Vcc
GND
R IN
AA.GND
L IN
AD.GND
L OUT
R OUT
AVCC
AA.GND
AA.GND
AA.GND
AA.GND
AA.GND
I/O3
A0
A7
WE
A9
A4
A8
I/O4
A6
I/O2
A1
CAS
A5
A3
A2
RAS
VCC
OE
GND
I/O1
PDOWN
BUCKUP
BUCKUP
DOUTO
PDOWN
BUCKUP
XRST
ADPON
DAPON
LDON
DFS0
DFS1
DAMUT
DIGEX
DIGCD
PCNT0
PCNT0
24
23
P.GND
3
1
2
2
3
1
D.GND
DVDD
DVDD
D.GND
D.GND
D.GND
D.GND
DSTB
MDDATA
KDATA
SERCH
DSCK
LOAD SW
MD-ST
RESET
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
SK
VCC
CS
RAD1
VDD2
RAD0
RAWEX
RARASX
TCRS
RAA10
RAA0
26 27 28
RAA1
RAA2
RAA3
RAA9
RAD3
RAD2
RACASX
RAOEX
RAA8
RAA6
RAA5
RAA4
DGND
SFSY
DINTX
COUT
MCCK
FOK
SENSE
VDD1
DGND
78 77 76
TOTMON
TEMON
SBCK
SBO
SBSY
VPD
DGND
XI
XO
SYD7
100
99 98
SYWRX
SYRDX
SYRS
EXPORT0
RSTX
SYD0
SYD1
SYD2
SYD3
SYD4
SYD5
SYD6
EXPORT1
TESO1
TEST3
TEST4
DIN
DOUT
VDD3
DGND
CDDATA
CDLRCK
CDBCLK
VXI
LRCK
BCLK
DFCK
ADDATA
DADATA
FEMON
VDD1
RAA7
48 49 50
PLCK
ACRCER
EFMO
X700KO
L3MODE
L3CLK
SYSCLK
VSSO
VREFD
VOUTL
GND
Vcc
VREF3.2V
GND
DIGIN
GND
DIGOUT
A/B
GND
Vcc
A8
A7
A5
A4
A6
A2
A1
A0
A4
A5
A6
A7
A8
A3
A2
A1
A0
A9
SYRD
SYWR
SYD7
SYD6
SYD5
SYD4
SYD3
SYD2
SYD1
SYD0
XRST
DINT
MCCK
CIN
DSENSE
FOK
EPCS
EEPK
XRST
SYD4
SYD5
SYD6
A9
LOADIN
RESET
2
1
3
SERCH
KDATA
DSCK
MDDATA
DSTB
L3DATA
DFCK
BCLK
LRCK
ADDATA
DADATA
L3CLK
L3MODE
STID
ADDATA
DADATA
DFCK
BCLK
LRCK
NC
MD FLEXIBLE PCB
1
24
3
1
2
3
75
74
73
72
85 84 83 82 81
ADMUT
82 81
80
79
78
77
76
– are waveform Nos. on page 25 and 26.
PWB-B
(MD MECHANISM SWITCH ASSY)
SW 1952: DIRECT
ON-OFF
SW 1953: LEAD IN
ON-OFF
SW 1954: PLAYBACK
ON-OFF
SW 1955: RECORDING ON-OFF
SW 1956: LOADING
ON-OFF
– insert circuit and measure.
CN4101
G
CN4002
G
C1743
47/4
L1702
10
µ
H
TP1701
R1947
47
JC121
0.047
IC1202
IX2474AF
4M bit D-RAM
ENCODE/DECODE/ATRAC
TP1204
R1254
220
TP1210
100K
270P
C1208
0.047
R1211
220
C1209
1
RC120
220
R1210
100
C1203
1
IC1201
LR37648A
TP1215
TP1212
TP1214
TP1213
L1701
10
µ
H
C1405
0.1
R1473
100K
TP1217
TP1218
TP1216
C1207
1
C1210
1
R1456
1K
R1202
1M
C1204
12P(CH)
XL1201
C0001AW
R1201
150
C1205
12P
(CH)
R1418
47K
R1969
56
C1954
15P
(CH)
C1952
0.01
R1962
220K
C1955 0.047
C1958
0.047
R1965
10K
R1963
1.5K
C1956 47/6.3
C1953
0.47
IC1907
TC9246F
CLOCK
GENERATOR
R1961
100
C1957
100/6.3
C1964 0.001
R1964
6.8K
R1968
220
R1967
47
AND GATE
IC1906
TC7ST08F
C1951
0.047
R1262
10K
R1263
10K
R1261
10K
R1809
390
Q1807
2SA1314C
IC1801
XC62EP32
C1805
1
TP1702
TP1503
TP1501
TP1502
TP1512
TP1511
CN1902
R1716
3.3K
R1715
1K
C1810
1
IC1802
NJM431U
Q1701
2SC2412KR
R1717
820
C1704
1
R1806
12
R1807
12
R1734
47K
R1735
47K
R1733
47
R1731
47
C1729
220P
CJ172
220P
(CH)
C1724
100P
(CH)
C1722
100P
(CH)
TP1520
TP1518
JC171
00
TP1519
TP1521
TP1523
TP1524
TP1522
LR190
4.7
µ
H
L1950
1
µ
H
C1904
0.33
JC196
00
TP1515
TP1516
TP1517
Q1451
RNC1407
R1461 10K
R1459 10K
R1463
10K
C1425
0.047
TP1510
TP1509
TP1508
TP1507
TP1505
TP1506
R1452
3.3K
R1454 1K
R1458 6.8K
R1460 6.8K
R1462 6.8K
R1464 220
R1466 220
TP1504
JC170
00
R1995
2.2K
R1994
2.2K
TP1803
Q1806
RNC1404
R1810
1K
R1811
27K
R1221
220
C1703
47/4
R1710
30K
R1711
39K
R1808
27K
R1708
4.3K
R1707
4.3K
C1460
1
TP1273
IC1701
UDA1340
AD/DA CONVERTER
C1716
0.01
C1711
0.01
C1702
0.047
C1701
0.01
C1700
0.01
C1717
0.01
TP1711
TP1710
C1712
47/4
C1714
47/4
TP1713
TP1712
C1713
22/4
C1715
22/4
C1720
0.01
C1806
10
R1266
10K
C1706 10/16
C1707
10/16
R1701
1M
R1702
680K
C1801
2.2
C1803
10
Q1802
RN1406
Q1803
RN1406
TP1801
R1801 1.8K
Q1801
2SA1314C
R1802
270
R1805
100K
R1804
220K
C1802 100/10
TP1279
Q1804
2SA1162G
R1821
1
R1820
1
R1281
47
TP1278
R1269
00
R1478
TP1902
TP1901
TP1904
CN1904
C1927
0.047
AND GATE
IC1916
74VHC08F
C1913
22P
R1927
22
R1974
220
R1973
6.8K
R1939
1K
C1710
47/4
C1709
0.047
L1203
4.7
µ
H
L1201
0.47
µ
H
IC1990
74AC04FS
INVERTER
C1992
0.1
C1991
10
D1990
1SS372
C1990
1
C1206
1
R1712
100K
R1713
39K
R1714
39K
TP1911
-PROM
REGULATOR
REGULATOR
(CH)
7
8
9
9
6
6
13 14
18
19
17
21
20
22
23
24
: MD PLAYBACK SIGNAL
: MD RECORDING SIGNAL
1
24
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299