Yamaha DRX-2 Service Manual page 164

DRX-2
I SCHEMATIC DIAGRAM
ANALOG: VPS
1990 D1 2934 B1 2937 D1 3932 C4 3935 E1 5932 A3
2932 B4 2935 C1 2938 B3 3933 C4 3936 E3 7931 B2
2933 B4 2936 C1 3931 B2 3934 D1 5931 A4 I987 B4
1 2
I994
5SW
A A: DC, 1 V/Div
20ns/Div
GND
GND
GND
B
7931
STV5348 5 6 2 4
0.4V I989
1 CVBS
CLAMPING
SYNCHRONIZING
2935 I991
28 CBLK
DATA EXTRACTION
C
100n
1.6V
GND
21 VCR_|TV
5V
2936 2.4V I994
24 XTI
OSCILLATOR
22p
2937 FREQUENCY
23 XTO
I995 SYNTHETIZER
22p 2.7V
TIME BASE
D I996
25 VSSO
I997
3934
16 SCL
SCLSW
I2C BUS
100R
4.5V
I998 INTERFACE
3935
17 SDA
SDASW
100R
4.5V
7
E
GND
1 2
164
G model
I988 B2 I991 C1 I994 C1 I997 D1
I989 C1 I992 C4 I995 D1 I998 E1
I990 C4 I993 C1 I996 D1 I999 E3
3 4
5SW
I989
A: DC, 200mV/Div
10us/Div
5932
GND
GND
GND
GND
18 22 3
Data
5V
DATA DECODING
Clock
I990
DATA 3932
DV_ 19
PROCESSING
47K
I992 3933
20
TEST1
0V 47K
27
TEST2
8 PAGES
MEMORY
GND
12
BLAN
R 8
DISPLAY
G 9
INTERFACE
B 10
Y 15
26 11 14 13
0V
GND
GND
3 4
ANALOG: Follow Me (FOME)
2940 A2 2944 D4 3937 C1 3941 D3
2941 B3 2945 D2 3938 C1 3942 E1
2942 D2 2946 E1 3939 C3 3943 E2
2943 D4 2947 E3 3940 D1 3944 E3
1
2940
100n
3948
A
4K7
A
3951
22K
3953
B
B
4K7
3937
C
C
2K2
I955
3938
2K2
7934-C
LM339D
D
D
I956 2942
I957 2945
3940
10M
180p
3946
E
E
1
3945 E3 3950 A3 3954 C2 7934-B B4 I951 B3
3946 E2 3951 B2 7932 B2 7934-C C2 I952 B3
3947 E4 3952 B3 7933 B3 7934-D C3 I954 C3
3948 A2 3953 B2 7934-A A2 F950 A2 I955 C1
2 3 4
7934-A
LM339D
5SW
I951
3952
15K
I952 2941
10u
3939
4K7
7934-D
LM339D
2944
I958
2n2 2n2
I959 2943
3941
10M
180p
3947
33K 33K
2 3 4
I956 D2
I957 D2
I958 D3
I959 D3
A
B
7934-B
LM339D
C
D
E