Yamaha KMA-1000 Service Manual page 48

A B C
KMA-1000/KMA-950
OPERATION 2/2
1
OPERATION (4)
MIC IN
MIC 1
2
MIC 2
3
4
VIDEO SELECTOR
5
6
5.1
IC237
2.8
2.8
1 2
0
VIDEO
7
DVD INPUT
0 0
OUTPUT 1
BGM INPUT
8 OPERATION (1)
OUTPUT 2
9
IC235, 236: BA7649AF-E2
Video signal switcher for VTR, TV
14 13 12 11
10
LOGIC
1 2 3 4
48
D E F
KMA-950
OPERATION (6)
Page 47 G4 ECHO MODE
to OPERATION (2)_CB707
W702
Page 45 A3
to FUNCTION (2)_W303
CB901
BALANCED MIC INPUT
1
2
VIDEO AMP
IC238
IC239
IC240
IC237 IC237
2.8 2.8 2.8 2.7
5 6 11 10
IC237 IC237 IC237
0 5.1 5.1 0 0 0
9
3 4 8 13 12
IC238, 239: NJM2267M
Dual video 6 dB amplifier with 75-ohms driver
V+
7
IC237: TC74HCU04AFEL
Hex inverters
VIN2 8
6 dB 75-ohms
10 9 8
Amp Driver
1A VCC
1 14
2.2k
1Y 2 13 6A 2.0k
2A 12
3 6Y
VIN1 1
6 dB 75-ohms
2Y 4 11 5A Amp Driver
3A 5 10 5Y
2.2k
5 6 7
3Y 2.0k
6 9 4A
GND 7 8 4Y 2
GND
G H
Page 49
to MAIN (1)_CB409
0 5.2
CB562
MIC AMP
12.1
0
IC241
0 0
0
IC241
0 0
-11.5
VIDEO CONTROL
5.1
0
0
REMOTE
0
0.7
0
5.1
5.1
0
IC240: TC74HC595AF
8-bit Shift register/latch (3-state)
SCLR 10
R R R R R R R R
SER 14 D Q D Q D Q D Q D Q D Q D Q D Q
SCK SCK SCK SCK SCK SCK SCK SCK
5 VOUT2 SCK 11
D Q D Q D Q D Q D Q D Q D Q
6 VSAG2
RCK RCK RCK RCK RCK RCK RCK
RCK 12
4
VOUT1
G
3 VSAG1 13
8 16 15 1 2 3 4 5
GND VCC QA QB QC QD QE QF QG
I J K
K4
POWER
OPERATION (3)
ON/OFF
Page 44 L7
to FUNCTION (1)_CB21
CB237
9 QH'
D Q IC241: UPC4570G2-E1-A
Dual operational amplifier
RCK
RCK SCK SCLR G FUNCTION
X X X 1 QA thru QH = Tri-State
Shift Register cleared
X X L X
OUT 1 +V CC
QH' = 0 1 8
Shift Register clocked
X H X
–IN 1 OUT 2
QN = Qn-1, Q0 = SER 2 7
+ – + –
Contents of Shift
+IN -IN
1 3 6 2
X H X Register transferred
to output latches
–V 4 5 +IN
CC 2
6 7
QH
L M N
* All voltages are measured with a 10MΩ/V DC electronic volt meter.
* Components having special characteristics are marked Z and must be replaced
with parts having specifications equal to those originally installed.
* Schematic diagram is subject to change without notice.
O