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Service Manual - Page 1
... OFF during disassembly and part replacement. P.O.Box 1, Hamamatsu, Japan
'08.01 IMPORTANT: The presentation or sale of YAMAHA are subject to change without permission.
Should any static electricity your body may have accumulated by the users, and have therefore not been restated.
STEREO AMPLIFIER
A-S2000
SERVICE MANUAL
A-S2000
IMPORTANT NOTICE
This manual has been provided for...
Service Manual - Page 2
...
A-S2000 (U, C, R, T, K, A, B, G, L, J models)
A-S2000
2 Leakage Current Measurement (For 120V Models Only) When service has been completed, it is imperative to verify that of the lead solder, be sure to 1500 ohms shunted by 0.15µF.
If you come in contact with the AC plug in this product, wash your skin! Critical Components Information Components having specifications equal...
Service Manual - Page 7
... kHz
Audio Muting 20 dB (approx.)
I Audio Section
Minimum RMS Output Power (Power Amp. Australian model B ...model G .......... A-S2000
I SPECIFICATIONS
I General / ૯߹ Power Supply
U, C models AC 120 V, 60 Hz R, L models AC 110/120/220/230-240 V, 50/60 Hz T model AC 220 V, 50 Hz K model AC 220 V, 60 Hz A model AC 240 V, 50 Hz B, G models AC 230 V, 50 Hz J model...
Service Manual - Page 9
...SERVICE PRECAUTIONS
Safety measures • Some internal parts in the order as wearing insulating gloves.
• Note that positions indicated below are dangerous. Then
remove the panel side L. (Fig. 1) c. Loosen each lock set screw to remove 3 knob TC unit. (Fig. 1)
d.
Before starting any repair...ʠ1)0/0 H
JHʣ
A-S2000
* When installing the knob unit, it is ...
Service Manual - Page 10
... VOLUME (VR501) and tighten the lock set it does not rub against the front panel. F 5 5 5 5 5 3
Center position of BALANCE
Lock set screw ࢭΊωδ
VR504
SW501
0.5-0.75mm
Cut
Front panel
Lock set screw ࢭΊωδ
VR501
Lock set screw of BALANCE as an example. A-S2000
G When installing the knob VOL unit:
a. Turn...
Service Manual - Page 13
.... 5) h. Remove 18 screws (D). (Fig. 5) c. Remove the power unit. (Fig. 5)
B JHʣ C D JHʣ D JHʣ E E JHʣ F JHʣ G JHʣ
13
A-S2000 Removal of Power Unit a. Remove the amplifier unit L together with the heat
sink.
3ͷ֎͠ํ B 9ͷωδຊɺ0 JHʣ C JHʣ D A JHʣ E JH...
Service Manual - Page 15
Then
place the P.C.B. A-S2000
When checking the P.C.B.: • Remove frame panels L/R. • Put the rubber sheet and cloth over this unit, the ground of the amplifier unit L/R is also possible..., using a ground lead wire or the like. (Fig. 7) • It is connected to check the amplifier unit L/R from the bottom. (Fig. 7)
1 3 1$#Λ
JH 3
3 JH 3 JHʣ
AMP...
Service Manual - Page 18
... '6/$5*0/ʢʣ1$#͓Αͼ'30/5ʢʣ1$#Λα
ϙʔτ13&-3 JHʣ
Support PRE L αϙʔτ13&- Removal of FUNCTION (1) P.C.B. Remove CB305. (Fig. 10) c. A-S2000
10. Remove 9 screws (S), a screw (T), and 2 screws (U). (Fig. 10)
b. FRONT (10) P.C.B. S
T S
Support PRE R αϙʔτ13&3
S S
Fig. 10
Bottom view...
Service Manual - Page 19
...;3DI JHʣ
mV 10 01
DC voltage / %$ిѹ
10 20
+4.0 to +8.0 mV
19
R ch VR101
DC +4.0 to +8.0 mV
CB75
CB55
Front side
Fig. 1
A-S2000
CB75
DC +4.0 to +8.0 mV
CB55
DC +4.0 to +8.0 mV minute
MAIN (2) P.C.B. (Side A) L ch
VR201
MAIN (1) P.C.B. (Side A) R ch
VR101
MAIN (2) P.C.B. Condition • Start adjustment 20 minutes or...
Service Manual - Page 29
...transformer)
PSVA2 (±B1, ±B2, ±B3 and
±B4 of MAIN P.C.B.)
• Amplifier...;."*/1 DIʣ
13*3ʢ."*/1 3DIʣ
A-S2000
• TMP protection L/Rch
Cause
: Abnormal ...AUDIO MUTE" switch for 3 seconds or longer. Normal value : 0.804 to start this unit with a failure un-repaired... time, keep pressing down the "AUDIO MUTE" switch, set the "POWER ON/OFF" switch ...
Service Manual - Page 37
...
HEADPHONE AMP. COLD(-) RY401
IC413
IC302 IC303
RY403
FLOATING BALANCED POWER AMPLIFIER
FRONT • See page 64-66 →
SCHEMATIC DIAGRAM
SPEAKER DRIVER
HOT (POSITIVE PHASE) SIDE
SPCH A L/R CH RY201/R111
SPCH...41-43
INDEPENDENT REGULATED POWER SUPPLY
(for AUDIO)
LED_PWR REM
IC501
PDET
PRV
L CH
+B4/-B4
HPTRIM 14 SP_AB 15
3,4
9-11
SUB-TRANSFORMER
T1
D304
D336
for COLD
6
(...
Service Manual - Page 59
... 0
0
-11.9
-11.9
I
J
K
L
M
N
A-S2000
W2001 CB203
Page 66 H2 to FRONT (12)_CB59
Page 62 H8 to...amplifier
OUT1 1 -IN1 2 +IN1 3 -VCC 4
+- +-
8 +VCC 7 OUT2 6 -IN2 5 +IN2
# 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...
Service Manual - Page 60
A
B
C
D
E
F
G
H
I
A-S2000
1
FUNCTION 1/3
2
3
Page 65 M5
to FRONT (10)_W1002
CB301
4
5
6
12.0 -11.9
-11.9 -11.9
-11.8 -11.9
-...and must be replaced
with parts having specifications equal to those originally installed. # Schematic ...amplifier
OUT1 1 -IN1 2 +IN1 3 -VCC 4
+- +-
8 +VCC 7 OUT2 6 -IN2 5 +IN2
IC302, 303: OP275GSR Dual bipolar/JFET, audio operational amplifier
OUT A 1 -IN...
Service Manual - Page 61
...
G
H
I
J
K
L
M
N
FUNCTION 2/3
1
A-S2000
12.5 12.5 0 0 0 0 0 0 0 0 0
...audio operational amplifier
OUT A 1 -IN A 2 +IN A 3 V- 4
8 V+ 7 OUT B 6 -IN B 5 +IN B
IC413: NJM2068MD-TE2 Dual operational amplifier...TEST 43 VDD 45
Zero crossing
detection
...replaced
with parts having specifications equal to those originally installed. # Schematic diagram is subject to change without notice.
61
Service Manual - Page 67
A-S2000
I REPLACEMENT PARTS LIST
• ELECTRICAL COMPONENT PARTS
WARNING
G Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed.
AAX60720: CHIP RESISTOR SAMPLE BOOK
˔ s
9$)*13&4*45034".1-�,
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS:
C.A.EL.CHP : CHIP ALUMI.ELECTROLYTIC ...
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