Cambridge Audio 740A Service Manual page 60

+5V +5V
+5V +5V
LK7
LK11
LK14
24 AWG LK32
24 AWG
24 AWG
24 AWG
LK25
LK36
24 AWG +5V +5V
LK3
24 AWG
LK12
24 AWG
LK31
LK4 24 AWG
24 AWG
24 AWG
LK24 LK13
LCD STR. LCD STR
24 AWG 24 AWG
+5V
LCD DECOUPLE
R19
C9
C7
C4
100nF 50V
10uF 16V
100R
Mono Ceramic 100nF 50V
Electrolytic
1/4W Metal Film
Mono Ceramic
LK35
24 AWG
1 CN1 2
1a 1
U2
2a 2
3a 3 4
Q0
LK33
4a 4 5
LK34 Q1
5a 5 6
LK30 Q2
24 AWG
6a 6 7
Q3
24 AWG
7a 7 14
Q4
8a 8 24 AWG 13
Q5
12
15 16
Q6
2x8 Way 11
Q7
LK26
DIL Bottom Entry Header
LK29
9
LK27 QS
24 AWG
10
LK28 QS
24 AWG
24 AWG M74HC4094B1R
24 AWG
LCD DISPLAY CONN
Q1
R3
BC337-25
ON/OFF
1K2 NPN Signal
1/4W Metal Film
PR1
Multiturn
R1
2 500R
Vss 1
56R
Vdd 2
1/4W Metal Film
Vo 3
RS 4
R/W 5
E 6
D0 7
D1 8 R6
D2 9
300R
D3 10
1/4W Metal Film
D4 11
D5 12
2
16
D6 13
D7 14
1 15
LED A 15
LED K 16
LCD CONN ORIENTATION FROM FRONT
CN11
1
2
+5V
3
PGC
4
PGD
5
MCLR
6
6 Way
ROW 2
+5V
R27 ROW 3
47K R30
1/4W Metal Film
47K
R29
1/4W Metal Film
47K
1/4W Metal Film
ROW 4
+5V
C22
47nF 50V
Ceramic
LK20
RS
LK23
24 AWG
C5
E
24 AWG
2
D 22pF 50V
3
X1
NP0 Ceramic
CLK
1
LCD STR.
STB C6 Strip Cut Crystal
15
OE 4MHz
22pF 50V
VCC
16 NP0 Ceramic
C11
+5V
10nF 50V
Ceramic
8
GND
R7 P5
10K
1/4W Metal Film
POWER AMP RELAY
R11
LK18
R2
24 AWG
10K
56R
1/4W Metal Film
1/4W Metal Film
Q2
R5
BRIGHT
10K
1/4W Metal Film
BC337-25 R10
NPN Signal
10K
1/4W Metal Film
COL 1 COL 2 COL 3
SW1 SW2 SW3
KPT-1105A KPT-1105A KPT-1105A
R31
INPUT 1 INPUT 2 INPUT 3
47K
1.
1/4W Metal Film
SW4 SW5 SW6
KPT-1105A KPT-1105A KPT-1105A
INPUT 4 INPUT 5 TAPE MON
SW7 SW8 SW9
LK15
2.
KPT-1105A KPT-1105A KPT-1105A
24 AWG
+5V
ON/STBY SPEAKER MODE
10K
SW10
1/4W Metal Film
R4
LK9
MCLR
KPT-1105A
24 AWG
LK17 LK6
DIRECT
24 AWG 24 AWG
U1
1
MCLR/VPP RB7/PGD
2 40
RA0/AN0 RB6/PGC
3 39
RA1/AN1 RB5
38
4
RA2/AN2/Vref-/CVref RB4
37
5
LCD STR RA3/AN3/VREF+ RB3/PGM
6 36
RA4/T0CKI/C1OUT RB2
7 35
BRIGHT
RA5/AN4/SS/C2OUT RB1
34
8
ON/OFF RE0/RD/AN5 RB0/INT
33
9
RE1/WR/AN6 VDD
10 32
RE2/CS/AN7 VSS
11 31
VDD RD7/PSP7
30
12
VSS RD6/PSP6
29
13
OSC1/CLKIN RD5/PSP5
14 28
OSC2/CLKOUT RD4/PSP4
15 27
RCO/T1OSO/T1CKI RC7/RX/DT
26
16
RC1/T1OSI/CCP2 RC6/TX/CK
25
17
RC2/CCP1 RC5/SDO
18 24
RC3/SCK/SCL RC4/SDI/SDA
23
19
LK16 RD0/PSP0 RD3/PSP3
22
20
RD1/PSP1 RD2/PSP2
21
24 AWG PIC16F877A-I/P
+5V PROGRAMMED_WITH=AP20357/x
R12
220R
1/4W Metal Film
D1
Blue Azur LED
Q3
R15
BC337-25
220R
NPN Signal
1/4W Metal Film
LK22
24 AWG
LK21
24 AWG
+5V
SPEAKER B RELAY
SPEAKER A RELAY
PREAMP RELAY
VI/SHORT
CLIP DETECT
MAINS FAIL
DC OFFSET
OVER TEMP
+5V
D4
R13
1N4148
47K Signal Diode
1/8W Metal Film
DIRECT RELAY
R39
PGD PHONES DETECT
1K
PGC
1/8W Metal Film
RC5 TX
RC5 BLOCK
OVER TEMP
DC OFFSET
MAINS FAIL
CLIP DETECT
VI/SHORT
C3
PREAMP RELAY
1K
47nF 50V
SPEAKER A RELAY
1/8W Metal Film
SPEAKER B RELAY Ceramic
R16
SERIAL CLOCK
R17
SERIAL DATA
1K
INPUT STROBE R33
1/8W Metal Film
ABUS IR
47K
R36
1/4W Metal Film
POWER AMP RELAY
47K
VOLUME STROBE
1/4W Metal Film
R28
47K
1/4W Metal Film
U4:B
U4:D
LK5
12 4
LK8
13
24 AWG
11
24 AWG
VCC=+5V
VCC=+5V M74HC02
M74HC02 GND=GND
GND=GND
U4:C
+5V
U4:A
9
10
8
1
VCC=+5V
M74HC02
VCC=+5V
GND=GND
M74HC02
GND=GND
TO POWER AMP PCB
CN2
CN9
1
1
RC5 BLOCK
2
2
RC5 TX
3
3
PHONES DETECT
4
4
DIRECT RELAY
5
5
6
6
PIC IR ON/OFF
LK2
7
24 AWG 6 Way
8
Right Angle Header
9
10
TO PRE AMP PCB
10 Way
CN3
Right Angle Header
R32 1
2
100K CONTROL BUS IR
3
1/4W Metal Film VOLUME STROBE
4
POWER AMP RELAY
5
ABUS IR
6
INPUT STROBE
7
8
SERIAL DATA
9
SERIAL CLOCK
9 Way
Right Angle Header
LK10
CONTROL BUS IR CONTROL BUS IR
24 AWG
1K
R8
1/4W Metal Film
ROT1
1
R9
A SW
2
B SW
3
1K
C GND
4
1/4W Metal Film
FIX1
5
+5V C1 C2
FIX2
100nF 50V 100nF 50V
Noble
Mono Ceramic Mono Ceramic
Rotary Encoder
C8
10uF 16V
Electrolytic
+5V
+5V
R14
47R
1/4W Metal Film
U3
R34
10K
1/4W Metal Film
OPT
1
GND
2
+5V C16
3
100nF 50V
Mono Ceramic
6 TSOP34836
36KHz
5
+5V
P2 P3 P4 P1
R35
47K
3
1/8W Metal Film
2
C12 C13 C14
10nF 50V 10nF 50V 10nF 50V
Ceramic Ceramic Ceramic
60
C17
10uF 16V
Electrolytic
C15
10nF 50V
Ceramic