1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUEDRAWING NO.
23425
DRAWING TITLE
DRAWN BY CHK BY
DATE
Filename
ECO No.
DESCRIPTION OF CHANGE
J:\FILES\PCBS\CIRCUITS\L812C3_8.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
3 4Sheet of
Alpha 7,8 & 9 CD Players
Circuit Diagram
L812CT 8
30-Oct-1997
LRCIN
1
DIN
2
BCKIN
3
CLKO
4
XTI
5
XTO
6
DGND
7
Vdd
8
Vcc2R
9
AGND2R
10
EXT1R
11
EXT2R
12
VOUTR
13
AGND
14
Vcc
15
VOUTL
16
EXT2L
17
EXT1L
18
AGND2L
19
Vcc2L
20
Vdd
21
DGND
22
CKSL
23
MODE
24
MUTE
25
MD/DM1
26
MC/DM2
27
ML/DSD
28
Z201
PCM1710U
3
2
1
Z1A
NJM2114
5
6
7
Z1B
NJM2114
84
Z1C
NJM2114
R2
3K9 MF
R3
3K9 MF
R4
3K9 MF
R5
10K MF
R6
10K MF
R7
33K MF
C2
680P PP
C3
680P PP
R8
3K9 MF
R9
3K9 MF
C4
10U NP
R10
22K MF
R11
120R MF
R12
22R MF
Q1
BC547B
R13
10K MF
C5
100P PP
3
2
1
Z101A
NJM2114
5
6
7
Z101B
NJM2114
R102
3K9 MF
R103
3K9 MF
R104
3K9 MF
R105
10K MF
R106
10K MF
R107
33K MF
C102
680P PP
C103
680P PP
R108
3K9 MF
R109
3K9 MF
C104
10U NP
R110
22K MF
R111
120R MF
R112
22R MF
Q101
BC547B
R113
10K MF
C105
100P PP
Vin
I
GND
G
Vout
O
Z203
78L05
X1
16.9344MHZ
C13
33P CD
R18
33K MF
R19
33K MF
C15
100P CD
C16
100P CD
R21
470R MF
Q2
BC547B
C17
10N CD
C10
1N0 CD
+
C22
100U EL
+
C23
100U EL
+
C24
100U EL
C12
10N CD
R23
120R
R24
10R FU
Analogue ground
84
Z101C
NJM2114
12
Z202A 74HCU04
34
Z202B 74HCU04
56
Z202C 74HCU04
8 9
Z202D
74HCU04
10 11
Z202E 74HCU04
1213
Z202F
74HCU04
14
7
Z202G
74HCU04
+ C26
100U EL
R25
120R MF
N18V
P18V C6
680P PP
C7
680P PP
L1
7F003
Analogue Ground
Analogue Ground
R26
100K MF
Q3
BC557B
R14
10K MF
R15
10K MF
N18V
SH1
EMCPHONO2
GFS
FOK
WDCK
LRCK
BCLK
ADATA
R35
4M7 MF
ADATA
BCLK
LRCK
17MHZ
17MHZ
DATA
CLK
PGML
CLK
DATA
SUBQ
SENSE
XLT
LDON
DIGOUT
XRST
AMUTE
SQCK
SCOR
5
4
1
2
3
SCRN
T202
DIGOUT_TX
R22
220R MF
R36
620R MF
C14
33P CD
C18 10N CD
C19
10N CD
DIGOUT
P5V
P7V
Flex connector from CDM14 mech
SMUTE
P5V DAC
Data connector to DAC PCB
R31 330R MF
R32 330R MF
R33 330R MF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SK203
FFC32V
HDCD
RB3
17MHZ
WD
LRCK
ADATA
BCLK
AMUTE
XRST
DIGOUT
DEEM
SMUTE
RA0
RB7
RB6
RB5
RB4
RB0
RB1
RB2
C101
NOT FITTED
C1
NOT FITTED
1
EMC
SK4 PHONO2H
EMC
SK5
PHONO1
D1
1N4148
D2
1N4148
XRST
R20
22R MF
D3
1N4148
R17
10K MF
P5V
SCLK
12
34
56
78
910
1112
1314
1516
PL1
DIL16 VPLG
P5V DAC(A7)
P5V DAC(A7)
P11V CLK
D21
1N4148
PMUTE
PMUTE
L4
33UH AX
L5
33UH AX
R56
330R MF
R57
330R MF
XRST
PMUTE
VOUTL
LEFT1
LOUT
ROUT
RIGHT1
VOUTR
GNDOUT
ADATA
LRCK
BCLK
WDCK 17MHZ
DIGOUT
P5VCLK
AUDGND
DACGND
DIGOUTP
DIGOUTN
A7DAC5V
R16
330R MF
WD
L
R
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
SK2
DIL16 HSKT
Alpha 7 CD Configuration Plug
+ C29
100U EL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SK201
FFC23V
+
C27
10U EL
Q4
BC547B
D20
4V7 400MW
P18V
R29
1K0 MF
R30
10K MF
Q5
BC547B
R28
10K MF
Q6
BC547B
R34
10K MF
P5V
TP13
Mute
TP11
17MHz
TP8
TP9
TP10
LRCK
ADATA
BCLK
TP14
C21
10U NP
+
C25
22U EL OS
R49
120R MF
R62
330R MF
!
C20
680P PP
1
2
3
SW201A
A1014
C28
1N0 PP
C11
680P PP
CAH 96_1039
C38 was 100U EL. LK14 removed & R64 added25 June 1996
CAH 96_1104
LK66 removed & R65 added20 Nov 1996
4
5
CAH 24-4-97 UPGRADE IMPROVEMENTS97_1037 6
CAH 97_1069 2-9-97 HDCD LED changed
7
CAH 97_1101 30-10-97 HDCD LED removed from Alpha 7 CD
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