Front Panel Schematics - Cambridge Audio 640A Service Manual

+5V
R35
10k
+5V
C23
100n
DGND1
clock
data
strobe
R28
10k
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Cambridge Azur 640A Integrated Amplifier
+5V
+5V
CRS1
LK9
LINK
D1 R30
1N4148 33k
DGND1
HEADPHONE FREQ=4MHz
C22
strobe
100n
clock
data
U5
DGND1
1
RTCC MCLR/VPP
2 28
VDD CKIN
3 27
N/C CKOUT
4 26
VSS RC7 vol up
5 25
N/C RC6 vol down
6 24
RA0 RC5
23
7
RA1 RC4
8 22
RA2 RC3
CN1
9 21
RA3 RC2
10 20
RB0 RC1
11 19 1
RB1 RC0
12 18 2
RB2 RB7
17 3
13
HEADPHONE
RB3 RB6
16 4
14
RB4 RB5
15 H4 2.54mm 90
PIC16C57
REMOTE IN
+5V
R29 R27
10k 10k
CN2
speaker relay 8
clip 7
dc 6
standby relay 5
overcurrent/short 4
temp 3
2
R4 1
H8 2.54mm 90
10k
DGND1 DGND
LK3
LINK
SW5 SW4
TUNER CD
SW6 SW7
AV PHONO/AUX
SW9 SW10
TAPE MON DVD
AP12711/9 Front Panel Schematics
C24
100n
D2
U7 R33
DGND
820R
10
QS
9
DGND1 CHANNEL LED CHANNEL LED
QS
11
Q7
12
Q6
13
Q5
14
Q4
15 7
OE Q3
1 6
STB Q2
3 5
CLK Q1
2 4
D Q0
74HC4094
R1
220R
+5V
R2
CN6
10k 1
2
3
4
5
6
7
8
9
R7
DGND1 H9 2.54mm 90
820R
Q2 R6
R5
BC337 820R
10k
DGND1
C4
100n
LK8
LINK
D3 D4 D5 D6
R3
820R
CHANNEL LED CHANNEL LED CHANNEL LED
LK5
D7
LINK
CHANNEL LED
SNAP OFF SECTION (c)
D8
Red LED
protection
D9
lead mounted
Standby
Blue flat top LED
CN5
1
2
3 SW3
STANDBY
4
5
6
7
8
9
OPT
1
CONN-H9 GND
2
+5V C1
3
100n
U9
TSOP18 IR RECEI
SNAP OFF SECTION (d)
+5V
U6
1
FIN vol up
2
GND1
3
RIN vol down
C3
4
NC
47u 16V 5
GND2
6
CN7
VCC
7
OUT2
8 C21
COM 2
9
100n
OUT1 1
H2 2.54mm 90
BA6218
MOTOR
LK1
LINK
DGND1
DGND
13