Yamaha NX-A01 - Speaker Sys, Руководство по обслуживанию

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A B C D E F G H I J K L
NX-A01
15
1
2
3
4
5
6
7
8
9
MAIN 1/2
SCHEMATIC DIAGRAMS
★
All voltages are measured with a 10M
Ω
/V DC electronic volt meter.
★
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.
12.2 12.0 12.0
0
0 0.7
6.7 6.7
12.0
9.0
0.7
0.7
0
0 0 0 0
0 0
2.6 2.5 5.1
5.1
5.1 5.1 5.1 5.1
12.0
0.7 0.7
12.0
12.0
0
0
0.7
12.0
0.1
0.1 9.0 4.5 0.1
4.5
4.5 4.5 4.5 4.5 4.5 0.1
0.1 0 0
4.5
4.5 4.5 4.5 4.5 3.9
4.5
4.5
4.5 4.5
4.5 4.5
4.5
12.0
12.0
0.7
0 0 0 0 0 0
0
0
4.8 4.8 4.8 2.6 2.5
12.0 12.0
0.7 0.7
12.0
12.0
12.0 6.8
0.1
5.2
0
6.8
05
.2
1.3
L
MAIN (1)
VOLTAGE
REGULATOR
CHOPPER
REGULATOR
PORTABLE
IN
no_use
no_use
No replacement part avilable.
TEST V
SS
CE DI CL V
DD
Vref
RV
re
f
LV
re
f
CCB
INTERF
A
C
E
ZER
O
CR
OSSDET
MUL
T
IPLEXER
MUL
T
IPLEXER
LOGIC CIRCUIT
CONTR
O
L
CIRCUIT
ZER
O
CR
OSSDET
NO SIGNAL
TIMER
TIM
LOUT
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20
21
22
23
24
25
26
27 28 29 30 1 2 3 4
ROUT
LBASS2
LBASS1
LTRE
LIN
LSELO
L4 L3 L2 L1 R1 NC NC R2 R3 R4
RSELO
RIN
RTRE
RBASS1
RBASS2
IC301 : LC75348M
Single-chip electronic volume and tone control system
V
OUT
GND
V
IN
Thermal
Protection
Bandgap
Reference
NOISE
BYPAS S
CONT
IC306 : NJM2370U
Voltage regulator
1 2 3
5 4
1. CONTROL
2. GND
3. NOISE BYPASS
4.
V
OUT
5. V
IN
IC304 : YDA138
Digital audio power amplifier
Voltage
regulator
Overcurrent
detection
circuit
Overheat
detection
circuit
ON/OFF
circuit
Q
+
-
R
S
F/F
2
5
4
1
3
COM
PWM COMP.
V
IN
V
OUT
ON/OFF control
O
adj
V
ref
ERROR AMP.
Soft star
t
Oscillator
IC305 : PQ1CZ38M2ZPH
Chopper regulators
+
-
DC IN 12V
to MAIN(2)_CB502
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