Yamaha BD-940 Service Manual page 46

A B C
BD-940
MAIN 2/3
1
2
3
MAIN (2)
4
CB401
8.0
5
0
Page 45 F8
7.9
to MAIN (1)_W201
5.0
0
0
5.2
1.0
5.2
1.4
6
0
1.2
0
1.4
0
1.4
Page 47 M8
0
to MAIN (4)_CB901
0
0
5.2
0
0
7
0
0
0
-0.4
0
0
1.7
CB400
8
0 -0.4
0
5.1
0
9
0
10
46
D E F
CB802
7.6
0
To DC FAN
0
CB800
5.3
5.3
5.3
Page 45 K2
5.3
to MAIN (1)_CB201
5.3
5.3
5.3
0
0
0
2.6
0
0
5.2
0
3.2
5.2
0 0 0
1.8
0
2.6
0
2.6
0 0 0
0
0
IC401
0
0
LME49723MAX/NOP
IC401
8.0
0
IC401
0
0
LME49723MAX/NOP
5.2
5.1
-8.0
IC401
-7.9
G H
7.6 CB803
Page 45 G2
0
to MAIN (1)_W200
0
IC800
5.3
IC800
5.3 3 1 5.1
2 5.1
4 5.1
5.6 IC800 6
5 5.1
IC800
9
5.3 8 5.3
10
IC800
5.3 12 11 5.3
13
0
IC800
0
2.0
2.0
0
2.0
2.0
0
5.1
1.9
1.9
0
2.5
0
2.5
I J K
5.3
0
5.3
0
0
0
5.3
0
0
5.3
0
5.3
0 0
-7.9 -7.9
0 0
0 0
-7.9 0 -7.9 0
L M N
IC800: TC74VHC08F
Quad 2-input AND gate
1A 1 14 Vcc
1B 2 13 4B
JK800
1Y 3 12 4A
2A 4 11 4Y
SYSTEM CONNECTOR
2B 5 10 3B
TO: RECEIVER
2Y 6 9 3A
GND 7 8 3Y
IC402: MM1757DHBE
75-ohms x 2 driver for HD (built-in LPF SW for SD/HD)
V CC 1 V CC 2
7 21
150k-ohms
Bias
C in 1 LPF 27 C out
75-ohms
4dB 6.75MHz 2dB
Driver
Clamp
LPF
25 V out
V in 3
6.75MHz 75-ohms
2dB Driver
4dB
26 V SAG
Clamp
Writing port
Y in 5 LPF
22 Y out
4dB 6.75MHz 75-ohms
2dB
Driver
23 Y SAG
13.5MHz
Clamp
LPF
CY in 8
20 CY out
CB801
LPF
4dB
75-ohms
2dB
Driver
37MHz
19 CY SAG
13.5MHz
150k-ohms
Bias
LPF
Cb in 10 17 Cb out
LPF 75-ohms
4dB 2dB
Driver
37MHz
13.5MHz
150k-ohms
Bias
LPF
Cr in 12 15 Cr out
LPF 75-ohms
4dB 2dB
Driver
37MHz
YC MIX 4
SW Control
SD/HD
11 Logic
MUTE2
Mute1
2
MUTE1
Mute2
13
Dual/Single 9
BIAS 6 Vref
14 16 18 24 28
V EE 1 V EE 2 GND
IC401: LME49723MAX/NOPB
Dual high fidelity audio operational amplifier
V +
OUTPUT A 1 8
VIDEO OUT
INVERTING INPUT A 2 7 OUTPUT B
A B
- + + -
NON-INVERTING
3 6 INVERTING INPUT B
INPUT A
NON-INVERTING
V -
4 5
INPUT B
AUDIO OUT
0
5.2
OPTICAL DIGITAL OUT
1.7
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★ Components having special characteristics are marked ⚠ and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.