Yamaha RX-V461 Service Manual page 74

A B C
RX-V461/HTR-6040/RX-V461DAB
OPERATION 2/2
1
Q Q
3
12.7
2
13.1
13.1
CB251
1.7
1.7
W2251
3
OPERATION (3)
4
3.3
3.3
3.3
0
0
5
0 0
11.1
0
W2151
0
T E
L 10.9 1 3 10.3
10.3
IC232
CB231
6
10.3
CB232
1.5
1.5
0
IC233
7 5.0 19.2
0
W2152
CB233
8
W2153
W2154
9
w w w
10
# All voltages are measured with a 10MΩ/V DC electronic voltmeter.
# Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
# Schematic diagram is subject to change without notice.
74
D E F
7 1 5
6 3
3.2
3.2
0
13.3 13.3
AC 6.9
5.5 5.5
5.5
5.5
5.5
CB256
0
0
W251A
CB257
CB252 CB254
W252A
To POWER TRANSFORMER
3.3
0
3.3
0
IC238
1.0
0
0
0
9 4 2 2 9 6 5 1 3
11.1
IC235
5.3
11.1
1.5
0
-19.4
IC236
19.2
12.0
-0.1
-0.1
0
-20.4
0
-11.8
-20.2
IC237
IC234
11.9
5.3
11.9 5.0 5.4
0
0 0
0
0
0
0
0
x a o
. i
G H
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1 5
0
AC IN
W251B
CB253 CB255
W252B
OPERATION (4)
OPERATION (2)
3.3
(B model)
Q Q
3
11.1
5.2
0
MB20310
3P 100mm
CB234
AC 31.9
AC 10.7
To POWER TRANSFORMER
AC 10.8
AC 5.1
CB235
Page 73 K5
to OPERATION (1)_CB203
u 1 6 3
y
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I J K
2 4
8 9
7 6 3 1 5 1 5 0 8
MB20310
3P 100mm
MB20235
2P 350mm
IC237: KIA7912PI
Voltage regulator
R22
R15 R18 R21 R23
Q28 Q17 Q21
Q22 Q24
R16 R13 R12
Q23
R24
Q19
Q29
R20
R1
Q18 Q20
Q25
Q30
R14 Q31
R17 R25
R19
Q12 Q13
Q2 Q3 Q26-1 R11
R10
R26
Q26 Q27
Q27-1
Q7
D4 Q14
Q15
R0 C2 C1
Q16
Q8 R9
R4 R5 R6
Q4 Q6 Q9 Q11
R3
Q5 Q10
R8
R2
R7
IC235: NJM2388F63
Low dropout voltage regulator with ON/OFF control
V
IN 1
m
c o
.
Bandgap
Reference
ON/OFF
Cont 4
control
Over Voltage Thermal Over Current
Protection Protection Protection
GND
3
L M N
IC BLOCK DIAGRAMS OPERATION 1/2
2
9 8 9 9
IC201: M66003-0131FP-R
18 digit 5 x 7 segment VFD controller/driver
Display code
RAM CGROM
(35-bit x 166) 44 SEG00
(8-bit x 60)
Segment 19 SEG25
Code
write output
17 SEG26
circuit
CGROM 9 SEG34
CS 2 Serial dot data
data write (35-bit x 16)
receive
SCK 3 Code/
SDATA 4 circuit
command
45 SEG35
control
circuit
DIG11/
52
SEG42
DIG12/
51
SEG41
Segment/
code DIG13/
select Digit 50
SEG40
select/ DIG14/
49
XIN 7
Clock Display output SEG39
timing
generator clock circuit DIG15/
controller scan pulse 48
XOUT 6 SEG38
DIG16/
47
SEG37
DIG17/
46
SEG36
63 DIG00
Digit
RESET 1 output
circuit
Vcc1
8 53 DIG10
Vcc2 18
Vss 5
Vp 64
IC202: AZ4580MTR-E1
Dual low noise operational amplifiers
V
CC
OUTPUT
-INPUT
+INPUT
V
EE
IC232: NJM2388F33
Low dropout voltage regulator with ON/OFF control
V
IN 1 2 V
OUT
Bandgap
Reference
ON/OFF
Cont
4
control
9 2 4 9 8 2 9 9
Over Voltage Thermal Over Current
Protection Protection Protection
GND
3
IC236: KIA7812API
Voltage regulator
1 INPUT
R22 R17 R23
R1 Q11
Q11-1
Q15
Q16
Q12
Q14 R14
R10 R15
Q17 Q19
R16
R19
R12 3 OUTPUT
Q18 R20
Q6
Q1
R18
R11 R9
R7 C1
Z1
R2
Q10
Q2
Q7 R21
R3
Q13
Q4
Q3 Q5 Q9 Q8
R13
R4 R5
R6 R8
2 COMMON (GND)
IC233, 234: KIA7805API
Voltage regulator
1 INPUT
1 COMMON (GND)
R22 R17 R23
R1 Q11 Q11-1
Q15
Q16
Q12
Q14 R14
R10 R15
Q19
Q17
R19 R16
R12 3 OUTPUT
Q18 R20
Q6
Q1
R18
R11
R9
Z1 R7 C1
R2 Q10
Q2
3 OUTPUT R21
R3 Q7
Q13
Q4
Q3 Q5 Q9 Q8
R13
R4 R5
R6 R8
2
COMMON (GND)
2 INPUT
IC238: LM61CIZ
Temperature sensor
V
2
OUT