This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifi cally YAMAHA Products, are already known
and understood by the users, and have therefore not been restated.
WARNING:
IMPORTANT:
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service
departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and
specifi cations are subject to change without notice or obligation to retrofi t. Should any discrepancy appear to exist, please contact the
distributor's Service Division.
WARNING:
IMPORTANT:
Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,
destruction of expensive components, and failure of the product to perform as specifi ed. For these reasons, we advise
all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or
the appointed service representative.
The presentation or sale of this manual to any individual or fi rm does not constitute authorization, certifi cation or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
■ CONTENTS
TO SERVICE PERSONNEL ............................................2
REPLACEMENT PARTS LIST ................................ 49–59
REMOTE CONTROL .....................................................60
....................................... 19–25
P.O.Box 1, Hamamatsu, Japan
animate '08.10
A-S700
A-S700
■ TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked ⚠ and
must be replaced with parts having specifications equal to those
originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
• Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 F.
WALL
OUTLET
• Leakage current must not exceed 0.5mA.
• Be sure to test for leakage with the AC plug in both polarities.
EQUIPMENT
UNDER TEST
INSULATING
TABLE
AC LEAKAGE
TESTER OR
EQUIVALENT
“CAUTION”
“F251, F252: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A,
125V FUSE.”
CAUTION
F251, F252: REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION
F251, F252: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 8A, 125V.
WARNING: CHEMICAL CONTENT NOTICE!
This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive
harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or
expose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
About lead free solder /
All of the P.C.B.s installed in this unit and solder joints are
soldered using the lead free solder.
Among some types of lead free solder currently available,
A-S700
it is recommended to use one of the following types for
the repair work.
• Sn + Ag + Cu (tin + silver + copper)
• Sn + Cu (tin + copper)
• Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
As the melting point temperature of the lead free solder
is about 30°C to 40°C (50°F to 70°F) higher than that of
CD, etc. ..................................................... 0.47 V/470 ohms
Channel Separation /
(5.1 k-ohms input shorted)
CD, etc. ....................................................65/50 dB or more
Tone Control Characteristics /
BASS
Boost/Cut (50 Hz) .................................................. ±10 dB
Turnover frequency ................................................. 350 Hz
TREBLE
Boost/Cut (20 kHz) ................................................ ±10 dB
Turnover frequency ................................................ 3.5 kHz
Continuous Loudness Control /
コンティニュアスラウドネスコントロール
Attenuation /
コントロール部
チャンネルセパレーション
最大補正率
トーンコントロール特性
(1 kHz) .............................. -30 dB
A-S700
7
A-S700
■ General /
Power Supply /
総合
電源電圧
U model ........................................................... AC 120 V, 60 Hz
R model ...........................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
L models ....................................... AC 220/230-240 V, 50/60 Hz
J model ....................................................... AC 100 V, 50/60 Hz
Power Consumption /
消費電力
U model ........................................................ 260 W, 360 VA
R, T, K, A, B, G, L models ........................................ 260 W
J model ........................................................................ 205 W
Standby Power Consumption /
待機時消費電力
...................................................................................... 0.1 W
Maximum Power Consumption [R model]
6 ohms, 1 kHz, 10 % THD ........................................ 650 W
AC Outlets /
AC アウトレット
2 switched outlets
U model .............................100 W max. total / 0.8 A max. total
R model ...............................50 W max. total / 0.2 A max. total
T, G models .......................100 W max. total / 0.4 A max. total
L, J models ....................................................100 W max. total
1 switched outlet
A, B models ...................................... 100 W max. / 0.4 A max.
Dimensions (W x H x D) /
寸法(幅 × 高さ × 奥行き)
...........435 x 151 x 382 mm (17-1/8" x 5-15/16" x 15-1/16")
Weight / 質量
.................................................................... 10.9 kg (24 lbs.)
Finish /
仕上げ
Black color ........................U, R, T, K, A, B, G, L, J models
Silver color ........................U, R, T, K, A, B, G, L, J models
Accessories /
付属品
Remote control ................................................................ x 1
Battery (R6, AA, UM-3) ................................................... x 2
Power cable (2 m) .......................................................... x 1
* Specifications are subject to change without notice due to product
improvements.
※ 参考仕様および外観は予告なく変更されることがあります。
U ... U.S.A. and Canadian models
R .....................General model
T..................... Chinese model
K ...................... Korean model
A .................Australian model
B .......................British model
G ..................European model
L..................Singapore model
J ................... Japanese model
• DIMENSIONS /
A-S700
寸法図
22
(7/8")
290 (11-7/16")
339.5 (13-3/8")
20.5
(13/16")
130 (5-1/8")
151 (5-15/16")
382 (15-1/16")
395 (15-9/16")
435 (17-1/8")
21
(15/16")
Unit: mm (inch)
単位:mm(インチ)
8
■ INTERNAL VIEW
Top view
3456 7 8 91
2
Front view
17
A-S700
1
1011
12
16
15
13
14
Power Transformer
2
MAIN (2) P.C.B.
3
MAIN (3) P.C.B.
4
MAIN (8) P.C.B.
5
MAIN (5) P.C.B. (R, L models)
6
MAIN (4) P.C.B.
7
MAIN (7) P.C.B.
8
MAIN (1) P.C.B.
9
MAIN (6) P.C.B.
10
FUNCTION (1) P.C.B.
11
OPERATION (10) P.C.B.
12
FUNCTION (2) P.C.B.
13
OPERATION (3) P.C.B.
14
OPERATION (4) P.C.B.
15
OPERATION (2) P.C.B.
16
OPERATION (11) P.C.B.
17
OPERATION (5) P.C.B.
18
OPERATION (6) P.C.B.
19
OPERATION (7) P.C.B.
20
OPERATION (8) P.C.B.
21
OPERATION (1) P.C.B.
22
OPERATION (9) P.C.B.
191820
21
22
A-S700
9
A-S700
■ SERVICE PRECAUTIONS /
サービス時の注意事項
Safety measures
• Some internal parts in this product contain high voltages
and are dangerous. Be sure to take safety measures
during servicing, such as wearing insulating gloves.
• Note that positions indicated below are dangerous even
after the power is turned off because an electric charge
remains and a high voltage continues to exist there.
Before starting any repair work, perform discharge
by connecting a discharge resistor (5k-ohms/10W)
between terminals at following positions. The time required for discharging is about 30 seconds.
1. C141 on MAIN (1) P.C.B..
2. C142 on MAIN (1) P.C.B..
Refer to “PRINTED CIRCUIT BOARDS: MAIN (1) P.C.B.”.
■ DISASSEMBLY PROCEDURES /
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
• Spread the rubber sheet and the cloth. Then place
this unit on the cloth upside down. (Fig. 5)
• Remove 6 screws (
cover. (Fig. 5)
) and then remove the chassis
P.C.B. をチェックする場合には:
・ ゴムシートと布を敷き、本機を上下反転します。(Fig.5)
・
のネジ 6 本を外しシャーシカバーを取り外します。
(Fig.5)
Chassis cover
シャーシカバー
MAIN (1) P.C.B.
A-S700
Rubber sheet and cloth
ゴ ム シ ートと布
Fig. 5
16
A-S700
■ AMP ADJUSTMENT /
アンプ部調整
● CONFIRMATION OF IDLING CURRENT
1. Right after power is turned on, confirm that the voltage across the terminals of R111–R135 (L ch) and
R112–R136 (R ch) are between 0.1 mV to 10.0 mV.
2. If measured voltage exceeds 10.0 mV, open (cut off)
R175 (L ch), R176 (R ch) and reconfirm the voltage.
Attention
If the measured voltage exceeds 10.0 mV after
repairing the power amplifier, check other parts
again for any possible defect before cutting the
resistor.
3. Confirm that the voltage is between 0.20 mV and
When the power to this unit is turned on and the power indicator is flashing, the normal operation is not
available because the protection function is at work.
In that case, the protection information can be indicated by following procedures.
However, the power supply relay (RY251 of MAIN
P.C.B.) does not turn on.
• Operation procedures
* Perform this operation procedure within 30
seconds after turning off the power.
1. Press “POWER”, “CD DIRECT AMP”, and “PURE
DIRECT” switches to turn them off respectively.
(Fig. 1)
2. Repeat pressing “CD DIRECT AMP” switch to
turn it ON/OFF twice. (Fig. 1)
3. Repeat pressing “PURE DIRECT” switch to
turn it ON/OFF once. (Fig. 1)
4. Press “POWER” switch inward to the ON/
STANDBY position. (Fig. 1)
The POWER indicator flashes. (Fig. 2)