Yamaha KMA-1080 Service Manual page 35

A B C
OPERATION 2/2
1
OPERATION (4)
MIC 1
2
MIC 2
MIC 3
KMA-1080 only
3
4
VIDEO SELECTOR
VIDEO
DVD INPUT
5
OUTPUT 1
AUX INPUT
KMA-1080 only
OUTPUT 2
6
BGM INPUT
OUTPUT 3
VIDEO
7
DVD INPUT
OUTPUT 1
KMA-980 only
BGM INPUT
8 OPERATION (1)
OUTPUT 2
9
IC235, 236: BA7649AF-E2
Video signal switcher for VTR, TV
IC237: TC74HCU04AFEL
Hex inverters
14 13 12 11 10 9 8
1A
1
1Y 2
10
2A
3
LOGIC 2Y 4
3A 5
1 2 3 4 5 6 7
3Y
6
GND 7
D E F
MIC IN
Page 34 G4
to OPERATION (2)_CB707
Page 33 A3
to FUNCTION (2)_W303
CB901
BALANCED MIC INPUT
1
2
VIDEO AMP
IC238
IC239
5.1
IC237 IC237
IC237
2.8 2.8 2.8 2.8 2.7
2.8
1 2 5 6 11 10
0
IC237 IC237 IC237
0 0 0 5.1 5.1 0 0 0
9
3 4 8 13 12
IC240: TC74HC595AF
IC238, 239: NJM2267M 8-bit Shift register/latch (3-state)
Dual video 6 dB amplifier with 75-ohms driver
V+ SCLR 10
7
SER 14
VIN2 8
6 dB 75-ohms
5 VOUT2 SCK 11
Amp Driver
VCC
14
6 VSAG2
2.2k
13 6A 2.0k
RCK 12
12
6Y
VIN1 1
6 dB 75-ohms
4
VOUT1
11 5A Amp Driver
10 5Y
G
3 VSAG1 13
2.2k
2.0k
9 4A
8 4Y 2
GND
G H
KMA-1080 only KMA-980 only
OPERATION (5) OPERATION (6)
ECHO MODE Page 34 G4 ECHO MODE
5.2
0
to OPERATION (2)_CB707
5.4
W701 W702
VIDEO CONTROL
IC240
5.1
0
0
0
0.7
0
5.1
5.1
0
R R R R R R R R
D Q D Q D Q D Q D Q D Q D Q D Q 9 QH'
SCK SCK SCK SCK SCK SCK SCK SCK
D Q D Q D Q D Q D Q D Q D Q D Q
RCK RCK RCK RCK RCK RCK RCK RCK
RCK SCK SCLR G
X X X 1 QA thru QH = Tri-State
Shift Register cleared
X X L X
QH' = 0
Shift Register clocked
X H X
QN = Qn-1, Q0 = SER
Contents of Shift
X H X Register transferred
to output latches
8 16 15 1 2 3 4 5 6 7
GND VCC QA QB QC QD QE QF QG QH
I J K
POWER
0 5.2 OPERATION (7)
ON/OFF
CB562
Page 36 K4
to MAIN (1)_CB409
MIC AMP
12.1
0
IC241
0 0
0
IC241
0 0
-11.5
CB237
KMA-1080 only
REMOTE
IMPEDANCE SELECTOR
Page 36 K5
to MAIN (1)_CB411
CB238
W201
to POWER TRANSFORMER
IC241: UPC4570G2-E1-A
Dual operational amplifier
FUNCTION
OUT 1 +V CC
1 8
–IN 1 OUT 2
2 7
+ – + –
+IN -IN
1 3 6 2
–V 4 5 +IN
CC 2
L M N
KMA-1080/KMA-980
Page 32 L7
to FUNCTION (1)_CB21
● EXTERNAL (REMOTE IN) CODE
Command name Code 1 Code 2
MUSIC up 7B-84 87-82
MUSIC down 7B-85 87-83
MIC up 7B-86 87-84
MIC down 7B-87 87-85
ECHO up 7B-88 87-86
ECHO down 7B-89 87-87
INPUT 7B-8C -
DVD 7B-8E -
TAPE 7B-8F -
BGM 7B-90 -
AUX 7B-91 -
ECHO MODE 7B-92 -
KEY CONTROL up 7B-96 -
KEY CONTROL # 5
- 87-9D
KEY CONTROL # 4
- 87-88
KEY CONTROL # 3
- 87-89
KEY CONTROL # 2
- 87-8A
KEY CONTROL # 1
- 87-8B
KEY CONTROL 7B-97 87-8C
KEY CONTROL b 1
- 87-8D
KEY CONTROL b 2 - 87-8E
KEY CONTROL b 3
- 87-8F
KEY CONTROL b 4 - 87-90
KEY CONTROL b 5
- 87-9E
KEY CONTROL down 7B-98 87-92
ECHO 1 7B-C2
ECHO 2 7B-C3
ECHO 3 7B-C4
PRESET 1 7B-DD
PRESET 2 7B-DE
PRESET 3 7B-DF
* 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.
35