Schematic Diagrams - Yamaha NX-A01 Service Manual

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SCHEMATIC DIAGRAMS

MAIN 1/2
1
MAIN (1)
2
PORTABLE
IN
3
4
5
6
IC304 : YDA138
Digital audio power amplifier
7
8
9
C D E
Page 16 I2
to MAIN(2)_CB502
IC305 : PQ1CZ38M2ZPH
Chopper regulators
V
IN
1
Voltage ON/OFF
regulator circuit
PWM COMP.
+
-
Q
Overcurrent
R
F/F
detection
circuit S
ERROR AMP.
-
+
Overheat
detection
circuit
3
COM
F G
L
No replacement part avilable.
no_use
VOLTAGE
REGULATOR
no_use
V
OUT
2
IC306 : NJM2370U
Voltage regulator
ON/OFF control
5 V
IN
CONT
Thermal
Protection
O
adj
4
Bandgap
V
ref
Reference
GND
H I
12.0
0.7
IC301 : LC75348M
Single-chip electronic volume and tone control system
LOUT
LBASS2
LBASS1
LTRE
LIN
LSELO
DC IN 12V
12.0 12.2
CHOPPER
REGULATOR
V
OUT
5 4
1. CONTROL
2. GND
NOISE
3. NOISE BYPASS
BYPASS
4. V
OUT
V
5.
IN
1 2 3
# All voltages are measured with a 10MΩ/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.
J K L
NX-A01
4 3 2 1 30 29 28 27
5 26
ROUT
RBASS2
6 25
7 24
RBASS1
8 23
RTRE
9 22
RIN
21
10
RSELO
11 12 13 14 15 16 17 18 19 20
15