Cambridge Audio Azur 740C CD Player
AP19135/4 F
ront P
anel Circuit Diagram
CO
N
T
R
O
L
B
U
S
SPI DAT
A
RX
SPI
INT
SPI
DAT
A
T
X
SPI
C
L
K
SPI
C
S
SERIAL
T
X
SERIAL
RX
OE1
SO1_U
7
SO
2_U
7
SO1_U
9
MUTE
C1
1n
50V
X
7R
C2
1n
50V
X7R
1
2
3
4
5
6
7
CN
1
CO
N
N
-H7
K1
K2
PO
WE
R
D
E
T
E
CT
RESET
GND
+5
V
REMOT
E
1
2
3
4
5
6
7
8
CN
2
CO
N
N
-H8
1
2
3
4
5
6
7
8
CN
3
CO
N
N
-H8
1
2
3
4
5
6
7
CN
4
CO
N
N
-H7
+5V
+5
V
3
OP
T
1
GND
2
U1
T
S
OP18
IR
REC
E
IV
ER
C3
100n
R1
47R
SW1
St
a
n
d
b
y
SW2
Me
nu
SW6
St
o
p
SW3
Se
le
ct
SW4
O
p
e
n
/Cl
ose
SW5
Pla
y
/P
a
u
se
SW7
Ba
ck
Skip
SW8
Fo
rw
a
rd
Skip
R2
220R
LED
MC
L
R
/V
PP
1
RA
0
/A
N
0
2
RA
1
/A
N
1
3
RA
2
/A
N
2
4
RA
3
/A
N
3
/VREF
5
RA
4
/T0
C
K
I
6
RA
5
/A
N
4
/S
S
7
RE0
/R
D/
A
N
5
8
RE1
/W
R/
A
N
6
9
RB
4
37
RB
3
/PGM
36
RB
2
35
RB
0
/IN
T
33
VDD
32
VS
S
31
RD7
/PS
P7
30
RD6
/PS
P6
29
RB
1
34
RD5
/PS
P5
28
RD4
/PS
P4
27
RC
7
/RX
/D
T
26
RC
5
/SDO
24
RC
4
/S
D
I/
S
D
A
23
RD3
/PS
P3
22
RD2
/PS
P2
21
RC
6
/TX
/C
K
25
VDD
11
VS
S
12
OSC
1
/C
LK
IN
13
OSC
2/
C
L
K
O
U
T
14
RC
O
/T1
OSO/
T1
C
K
I
15
R
C
1
/T
1
O
S
I/
CCP2
16
RC
2
/C
C
P1
17
RC
3/
SCK
/S
C
L
18
RD0
/PS
P0
19
RE2
/CS
/A
N
7
10
RD1
/PS
P1
20
RB
5
38
RB
6
/PGC
39
RB
7
/PGD
40
U2
PIC
16F874
A
+5V
R3
56R
R4
56R
C4
100n
F
X1
C
RYS
T
A
L
FREQ=
20M
H
z
C5
22p
F
C6
22p
F
C7
10U
16V
R5
100R
C8
100n
F
R6
10K
+5V
Vss
Vdd
Vo
RS
R/
W
E
D0
D1
D2
D3
D4
D5
D6
D7
LED
A
LED
K
C9
100n
F
+5V
SERV
O
R
ESET
IR
OUT
C1
0
100n
F
+5V
LED
SERV
O
R
ESET
To
Servo
Board
LCD
Connector
2
LCD
Connector
1
From
Servo
Board
(LCD)
+5V
R9
220R
C1
1
10U
1
6V
RESET
RESET
+5V
LCD
C1
2
100n
F
ON/
OFF
BRIG
H
T
BRIG
H
T
ON/
O
FF
Q1
BC
337
R1
2
10K
Q2
BC
337
R1
3
10K
Q3
BC
337
Q4
BC
337
R1
4
1K
2
R1
5
10K
H0
14
A1
6
GND
8
A0
7
W0
12
L1
3
L0
13
H1
1
W1
4
A2
5
SD
A
10
SC
L
9
VCC
16
U3
DS180
3
+5V
_
SER
V
O
+5V
_
SER
V
O
1
2
3
4
5
6
7
8
9
CN
6
JS
T
2
M
M
S9B-
PH
-K
S
1
2
3
4
5
6
7
8
CN
7
JS
T
2
MM
S
8
B
-P
H
-KS
R1
8
10K
R1
9
10K
SE
G15
16
SE
G14
15
SE
G13
14
SE
G12
13
SE
G11
12
SE
G10
11
SE
G9
10
SE
G8
9
SE
G7
8
SE
G6
7
SE
G5
6
SE
G4
5
SE
G3
4
SE
G2
3
SE
G1
2
SE
G0
1
SE
G16
17
SE
G17
18
SE
G18
19
CO
M
1
20
CO
M
2
21
CO
M
3
22
CO
M
4
23
NC
24
CN
1
0
LC
D
740C
CO
M1
CO
M1
CO
M2
CO
M3
CO
M4
CO
M2
CO
M3
CO
M4
+5V
R2
0
100R
R2
1
100R
R2
2
100R
R2
3
100R
R2
4
100R
R2
5
100R
R2
6
100R
R2
7
100R
R2
8
100R
R2
9
100R
R3
0
100R
R3
1
100R
R3
2
100R
CLK
SD
TX
SD
RX
CS
IN
T
RS
E
OSC1
OSC2
U7_
SO
1
U7_
S
02
U9_
S
01
SCL
D4
D5
D6
D7
SDA
SERI
A
L
T
X
SERI
A
L
R
X
SERV
O
RESET
RESET
OE1#
MU
TE
IR OUT
IR
IN
D1
LED
3
M
M
BLU
E
C1
3
10U
1
6V
C1
4
100n
F
1
P1
PAD
EM
C
M
3
1
P2
PAD
EM
C
M
3
1
P3
PAD
EM
C
M
3
C1
5
1n
F
C1
6
1n
F
C1
7
1n
F
R1
0
300R
1
3
2
R1
1
PRE
M
U
LT
I500R
MC
L
R
4
GP4
3
C
L
KI
N
2
Vss
8
GP0
7
GP1
6
GP2
5
Vdd
1
U4
PIC
12C
5
08
1
2
3
4
5
CN
8
DAT
A
1
2
3
4
5
CN
9
DAT
A
R3
3
680R
R3
4
680R
D2
BZX79C5
V1
500MW
D3
BZX79C5
V1
500MW
MGN
D
+5V
_
SER
V
O
MGN
D
FI
N
1
GND
1
2
RIN
3
GND
2
5
VCC
6
OUT
2
7
CO
M
8
OUT
1
9
U5
BA621
8
MGN
D
+8V
1
2
3
4
5
6
1a
2a
3a
4a
5a
6a
7
8
7a
8a
CN
5
C
O
NN-
8
H
EAD
DUAL
BOT
D4
1N4004
D5
1N4004
C18
10U1
6V
C1
9
100n
F
+8V
R3
5
100K
LED
1
P4
PAD
EM
C
M
3
1
P5
PAD
EM
C
M
3
C2
0
1n
F
C2
1
1n
F
C2
2
100n
F
TO
DAC
BOARD
CN8 (SPI)
TO
DAC
BOARD
CN9 (RS232/MUTE/SPDIF
CNTRL)
FROM
S
E
RV
O
B
OA
RD
DRA
W
E
R OP
EN
/C
L
O
S
E
(S
P
I)
T
O
MECH
DRA
W
E
R
O
P
E
N/
C
L
O
SE
(S
P
I)
R7
100R
R8
10OR
R1
6
R
M
ET
AL
1/
8W
4k7
1/
8W
M
e
ta
lFilm
R1
7
R
M
ET
AL
1/
8W
4k7
1/
8W
M
e
ta
lFilm
R3
6
RM
E
T
A
L
1
/4
W
220R
1/
4W
M
e
ta
lFilm
R3
7
R
M
ET
AL
1/
4W
220R
1/
4W
M
e
ta
lFilm
D6
1N400
4
D7
1N400
4
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