Block Diagrams; Audio Section Block Diagram - Yamaha A-S3000 Service Manual

A B
A-S3000

■ BLOCK DIAGRAMS

1
• See page 65, 66 →
INPUT
SCHEMATIC DIAGRAM
RYB1_PLTY
2
BAL 1
Phase change
L/R
(normal/inv.)
RYB2_PLTY
BAL 2
Phase change
L/R
(normal/inv.)
MC±18V
RY801
MC
PHONO Head AMP.
L/R
3
RY_MM/MC
RY802
CD L/R
TUNER L/R
LINE1 L/R
LINE2 L/R
MAIN IN
4
LINE2 OUT
(REC)
L/R
PRE OUT
Rear panel
AUTO POWER STANDBY
5 ON OFF
ATTENUATOR
BYPASS ATT.
PHASE
NORMAL INV.
TRIGGER
IN
IN
REMOTE
OUT
6
SYSTEM CONNECTOR
BASS TREBLE BALANCE
INPUT
VOLUME
Selector
Front panel
7
42
C D
INPUT SELECTOR
VOLUME
BUFFER AMPLIFIER /
UNBALANCE BALANCE
CONVERTER
ATT.UINT1 L
Hi: 18.6dB
Low and Unbalance: 12.5dB
RY_BAL_GAIN
IC717
ATT.UINT2 L
LINE1 ± 20V
IC718
RY_SEL_BAL
ATT.UINT3 L
MM EQ
AMP.
IC719
LINE1 ±20V
MM ±20V
ATT.UINT1 R
RY_BAL1_ IC720
RY_BAL2_
RY_CD_
ATT.UINT2 R
RY_TU_
RY_LINE1_
RY_LINE2_
REC OUT Buffer
RY_MDIR_
IC721
RY_PHONO
AMP GAIN: -12.2dB
LINE1 ± 20V
ATT.UINT3 R
IC901
IC722
N_REC_MT
N_MT_PRE_
Protection
Control
INDEPENDENT REGULATED POWER SUPPLY (for AUDIO)
Microprocessor
+5M
D11
IC504
+5S +5M
+5M
+5S
STBY_CNT
Sub-transformer
+3.3M +5M
PHONO MUTE
MM/MC IC411
PHONES
SPEAKERS METER
TRIM AC IN
OFF/A/B/A+B OFF/VU/PEAK
• See page 70, 71 →
FRONT FUNCTION
SCHEMATIC DIAGRAM
E F G

AUDIO Section Block Diagram

TONE CONTROL BUFFER AMPLIFIER
FLAT
AMP GAIN: 1.58dB
IC710
RY711
LINE2 ±20V
MAIN_MT
IC711
IC712
RY_TCBYP
VOL1 ±18V
AMP GAIN: 1.58dB
IC713
RY712
LINE2 ±20V
IC714 MAIN_MT
IC715
VOL2 ±18V
BALANCE UNBALANCE
LINE2 ±20V
AMP GAIN: 0.2dB
POWER TRANSFORMER
D307
reg
D6
+12C
-12C
reg
POWER SWITCH
RY_PWR1
RY_PWR2
POWER RELAY
• See page 67, 68 →
SCHEMATIC DIAGRAM
H I
FLOATING BALANCE
DISCRETE AMPLIFIER
SPEAKER OUT
SP A Lch
RY_SPA
±PB SP B Lch
RY_SPB
SPEAKER OUT
SP A Rch
RY_SPA
± PB
RY_SPB
SP B Rch
PK/N_VU
METER_MT
AMP GAIN: 15.9dB
±PB METER_ATT
METER_MT
LOW IMPEDANCE DRIVE
N_HP_DET
HEADPHONE AMPLIFIER ±12C
METER DRIVER METER
FLOATING POWER SUPPLY
+3.3M
R CH
D301
–
PSVA1
METER UNIT
PSVA2
D302
R CH
±B
+
L CH
D334
–
D335
L CH
+
D305 +PB
±PB
-PB
J
• See page 70, 71 →
FRONT
SCHEMATIC DIAGRAM
L CH
+
A
–
+
B
–
R CH
+
A
–
+
B
–
PHONES
IR
REMOTE
• See page 69 →
MAIN
SCHEMATIC DIAGRAM