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\L812C4_8.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
4 4Sheet of
Alpha 7,8 & 9 CD Players
Circuit Diagram
L812CT 8
30-Oct-1997
TIMER
1
RMIN
2
+5V
3
NC
4
NC
5
M/C
6
POML
7
CLK
8
SENSE
9
DATA
10
SQCK
11
SUBQ
12
NC
13
AMUTE
14
LDON
15
XLT
16
NC
17
R11
18
R12
19
R13
20
R14
21
KEY0
22
KEY1
23
KEY2
24
KEY3
25
+5V
26
+5V
27
AF ADJ
28
IN/OUTSW
29
RST
30
EXTAL
31
XTAL
32
VSS
33
RO1
34
RO2
35
RO3
36
RO4
37
DEEM
38
NC
39
SMUTE
40
NC
41
NC
42
P1
43
P2
44
P3
45
P4
46
P5
47
P6
48
P7
49
P8
50
P9
51
P10
52
P11
53
P12
54
P13
55
P14
56
P15
57
NC
58
NC
59
NC
60
NC
61
NC
62
10
63
20
64
30
65
40
66
50
67
60
68
70
69
80
70
-30v
71
+5V
72
+5V
73
+5V
74
+5V
75
LOADIN
76
LOADOUT
77
SCOR
78
SEL2
79
SEL1
80
Z212
CXP826P16Q
VF
1
VF
2
3
80
4
P15
5
P14
6
P13
7
8
P12
9
70
10
P11
11
60
12
P10
13
P9
14
50
15
P8
16
40
17
P7
18
P6
19
20
P5
21
30
22
P4
23
20
24
P3
25
P2
26
10
27
P1
28
29
-88.8888
88
VF
30
VF
31
DISC
SHUFFLE
> ||
DISP301
B1008
30
40
50
60
70
80
+
C292
100U EL
C291
47N CD
C293
47N CD
X201
CST4.00
C294
47N CD
R295
10K MF
R296
10K MF
R297
10K MF
R298
10K MF
R292
8K2 MF
R293 8K2 MF
R294 1K0 MF
D291
1N4148
D292
1N4148
D293
1N4148
D294
1N4148
D295
1N4148
D296
1N4148
D297
1N4148
R1
R2
R3
R4
R1
R2
R3
R4
C0' C1' C3'
C4'
C0
C2
C7
R308
8K2 MF
R313
8K2 MF
R307
1K2 MF
R312
1K2 MF
R306
1K5 MF
R311
1K5 MF
R305
2K2 MF
R310
2K2 MF
R304
3K3 MF
R309
3K3 MF
R303
5K6 MF
R302
12K MF
R301
33K MF
NEXT PREV FF FR PAUSE STOP PLAY OPEN
R11
R12
R13
R14
INOUT
DEEM
SMUTE
XRST
CHECK PROGRAM DISPLAY REPEAT
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
SK301
FFC32H
Display PCB
4MHZ
R291 3R3 FU
SW301 SW302 SW303 SW304 SW305 SW306 SW307 SW308
SW309 SW310 SW311 SW312
FILA FILB
Flexfoil connector to Display PCB
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
SK291
FFC32V
P5V
K0
K1
K0
K1
R314
220R MF
P5V
N30V
INOUT
LDIN
LDOUT
DEEM
SMUTE
AMUTE
4MHZ
RMIN
PGML
CLK
DATA
SCOR
SQCK
XRST
LDON
XLT
SENSE
SUBQ
P1
P3
P4
P6
P8
P9
P10
P12
P14
P15
20
40
50
60
70
P2
P5
P7
P11
P13
10
30
80
20
10
P15
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
R11
R12
R13
R14
XLT
LDON
AMUTE
SUBQ
SQCK
DATA
SENSE
CLK
PGML
LDIN
LDOUT
SCOR
RMIN
INOUT
LDIN
LDOUT
DEEM
SMUTE
AMUTE
4MHZ
RMIN
PGML
CLK
DATA
SCOR
SQCK
XRST
LDON
XLT
SENSE
SUBQ
NEXT PLAY
OPEN
PREV FF FR PAUSE STOP
CHECK PROG DISP REPEAT
VF2
VF1
DISGND
DIS5V
K0
K1
SMUTE
PGML CLK DATA
DEEM
RMIN
4MHZ
D80
D70
D60
D50
D40
D30
D20
D10
DP1
DP2
DP3
DP4
DP5
DP6
DP7
DP8
DP9
DP10
DP11
DP12
DP13
DP14
DP15
D80
D70
D60
D50
D40
D30
D20
D10
DP1
DP2
DP3
DP4
DP5
DP6
DP7
DP8
DP9
DP10
DP11
DP12
DP13
DP14
DP15
R60
8K2 MF
R61
8K2 MF
AMUTE
K0M
K1M
DEEM
TP12
LED301
LED GREEN
R63
33K MF
!
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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