Yamaha AS-700 Service manual

INTEGRATED AMPLIFIER
A-S700
SERVICE MANUAL
IMPORTANT NOTICE
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:
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
IMPEDANCE SELECTOR ...............................................3
FRONT PANEL ...............................................................3
REAR PANELS ...........................................................4–6
REMOTE CONTROL PANEL .......................................... 7
SPECIFICATIONS /
INTERNAL VIEW ............................................................ 9
SERVICE PRECAUTIONS / DISASSEMBLY PROCEDURES / AMP ADJUSTMENT /
101117
参考仕様
.....................................7–8
サービス時の注意事項
分解手順
アンプ部調整
....................... 17–18
Copyright © 2008 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
..... 10
........... 10–16
SELF-DIAGNOSTIC FUNCTION /
ダイアグ(自己診断機能)
IC DATA ...................................................................26–28
BLOCK DIAGRAM ........................................................ 29
PRINTED CIRCUIT BOARDS .................................30–43
PIN CONNECTION DIAGRAMS ...................................44
SCHEMATIC DIAGRAMS ....................................... 45–47
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
無鉛ハンダについて
本機に搭載されているすべての基板およびハンダ付けに よる接合部は無鉛ハンダでハンダ付けされています。
無鉛ハンダにはいくつかの種類がありますが、修理時に は下記のような無鉛ハンダの使用を推奨します。
󱾁 Sn+Ag+Cu(錫+銀+銅) 󱾁 Sn+Cu(錫 + 銅) 󱾁 Sn+Zn+Bi(錫 + 亜鉛 + ビスマス)
注意:
無鉛ハンダの融点温度は通常の鉛入りハンダに比べ 30 〜 40℃程度高くなっていますので、それぞれのハンダに合っ たハンダごてをご使用ください。
the lead solder, be sure to use a soldering iron suitable to each solder.
2
IMPEDANCE SELECTOR

IMPEDANCE SELECTOR

A-S700
WARNING:
Do not change the setting of the IMPEDANCE SELECTOR switch when the unit power is switched on, as doing so may damage the unit.

FRONT PANEL

A-S700 (U, R, T, K, A, B, G, L, J models)
A-S700
3

A-S700

REAR PANELS

A-S700 (U model)
A-S700 (R model)
A-S700 (T model)
A-S700
4
A-S700 (K model)
A-S700 (A model)
A-S700
A-S700 (B model)
A-S700
5
A-S700
A-S700 (G model)
A-S700 (L model)
A-S700 (J model)
A-S700
6
A-S700

REMOTE CONTROL PANEL

RAS7
SPECIFICATIONS /
Audio Section /
Minimum RMS Output Power (Power Amp. Section) /
定格出力(パワーアンプ部)
8 ohms, 0.019 % THD ................................... 90 W + 90 W
6 ohms, 0.03 % THD ................................. 105 W + 105 W
Dynamic Power /
8/6/4/2 ohms ...........................................135/160/200/240 W
Maximum Output Power /
R, L, J models (10 % THD, 8/6 ohms, JEITA) ... 140/160 W
B, G models (0.7 % THD, 4 ohms) ........................... 160 W
IEC Output Power [B, G models]
(1 kHz, 0.019 % THD, 8 ohms) ................................. 105 W
Power Band Width /
(0.03 % THD, 50 W, 8 ohms) ....................10 Hz to 50 kHz
Damping Factor /
1 kHz, 8 ohms ...................................................240 or more
Maximum Input Signal /
(1 kHz, 0.019 % THD)
PHONO ....................................................................... 70 mV
CD, etc. ........................................................................ 2.2 V
Frequency Response /
CD, etc. (20 Hz to 20 kHz) ................................. 0 ±0.5 dB
CD DIRECT AMP ON (10 Hz to 100 kHz) .......... 0 ±1.0 dB
RIAA Equalization Deviation /
PHONO ................................................................. 0 ±0.5 dB
Total Harmonic Distortion /
PHONO to OUT (REC) (3 V) .......................0.008 % or less
CD, etc. to SP OUT (50 W, 8 ohms) ..........0.012 % or less
Signal to Noise Ratio /
PHONO (5 mV input shorted) .......................87 dB or more
CD DIRECT AMP (200 mV input shorted) .......110 dB or more
Residual Noise /
CD DIRECT AMP ON ..................................................30 µV
PURE DIRECT ON ..................................................... 110 µV
Gain Tracking Error /
(0 to -60 dB) .................................................... 2 dB or less
オーディオ部
(20 Hz to 20 kHz)
ダイナミックパワー
実用最大出力
パワーバンド
ダンピングファクター
最大許容入力
周波数特性
全高調波歪率
信号対雑音比
残留ノイズ
(IHF-A Network)
GAIN トラッキングエラー
参考仕様
(IHF)
(1 kHz)
RIAA 偏差
(IHF-A Network)
(20 Hz to 20 kHz)
RAS7
WQ06690
Control Section /
Input Sensitivity/Input Impedance /
入力感度/入力インピーダンス
PHONO .................................................... 3.0 mV/47 k-ohms
CD, etc. .................................................. 200 mV/47 k-ohms
Output Level/Output Impedance /
出力電圧/インピーダンス
REC level ............................................... 200 mV/1.2 k-ohms
Headphone Output/Impedance /
ヘッドホン出力/インピーダンス
(Input 1 kHz, 200 mV, 8 ohms, 0.015 % THD)
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
34 56 7 8 91
2
Front view
17
A-S700
1
10 11
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.
安全対策
・ この製品の内部には高電圧部分があり危険です。修理
の際は、絶縁性の手袋を使用するなどの安全対策を 行ってください。
・ 下記箇所には電源を OFF にした後も電荷が残り、高電
圧が維持されており危険です。 修理作業前に放電用抵抗(5k Ω /10W)を下記箇所の 端子間に接続して放電してください。放電所用時間は 約 30 秒間です。
1. MAIN(1)P.C.B. の C141
2. MAIN(1)P.C.B. の C142 “PRINTEDCIRCUITBOARDS:MAIN(1)P.C.B.” を参照
してください。
分解手順
(番号順に部品を取り外してください。)
AC 電源コンセントから、電源コードを抜いてください。

1. Removal of Top Cover

a. Remove 4 screws ( ), 4 screws ( ) and screw ( ).
(Fig. 1)
b. Remove the top cover. (Fig. 1)

2. Removal of Front Panel

* Prepare an Allen hex socket screwdriver (2 mm)
for removal of knob unit.
a. Remove screw (
frame top. (Fig. 1)
b. Loosen lock set screw to remove the knob VOL unit.
(Fig. 1)
A-S700
c. Loosen lock set screw to remove the knob SEL unit.
(Fig. 1)
d. Remove 4 knob TCs. (Fig. 1) e. Remove 2 knob SP13s. (Fig. 1) f. Remove 7 screws ( g. Remove the front panel forward gradually using care
not to cause damage the keys. (Fig. 1)
* When installing the knob VOL/SEL unit, it is necessary
to position them as specified. (Refer to “When install­ing the knob VOL/SEL unit”.)
), screw ( ) and then remove the
). (Fig. 1)
1. トップカバーの外し方
a. のネジ4本、 のネジ4本、 のネジ 1 本を外し
ます。(Fig.1)
b. トップカバーを取り外します。(Fig.1)
2. フロントパネルの外し方
※ ノブユニットを取り外す場合、6 角穴用ドライバー
(2mm)を準備します。
a.
のネジ1本、  のネジ 1 本を外し、フレーム TOP
を取り外します。(Fig.1)
b. 止めネジを緩め、ノブ VOL ユニットを取り外します。
(Fig.1)
c. 止めネジを緩め、ノブ SEL ユニットを取り外します。
(Fig.1) d. ノブ TC4 個を取り外します。(Fig.1) e. ノブ SP132 個を取り外します。(Fig.1) f.
のネジ 7 本を外します。(Fig.1)
g. 各キーに傷がつかないようフロントパネルを前方へ
ゆっくり取り外します。(Fig.1)
※ ノブ VOL/SEL ユニットを取り付ける場合、決められ
た位置に合わせる必要があります。(“ノブ VOL/SEL ユ ニットを取り付ける場合” を参照)
10
Top cover
トップ カ バ ー
A-S700
Frame top
フレームTOP
Knob SP13
ノブSP13
Knob TC
ノブTC
Knob SEL unit
ノブSELユニット
Knob VOL unit
ノブVOLユニット
Lock set screw
止めネジ
Fig. 1
A-S700
Front panel
フロントパネル
2mm
An Allen hex socket screwdriver
6角穴用ドライバー
11
A-S700
• When installing the knob VOL unit:
a. Turn the VOLUME (VR805) counterclockwise fully. (Fig. 2) b. Match the slit in the knob VOL unit with the “VOLUME
MIN” position and install it in that state. (Fig. 2) * At this time, do not tighten the lock set screw.
c. Keep about 0.5 mm to 0.75 mm clearance from the
front panel to knob VOL unit. (Fig. 2) d. Tighten the lock set screw. (Fig. 2) e. After installation, perform following checks.
• Turn the knob VOL unit both directions to check that it does not rub against the front panel.
• Turn the knob VOL unit clockwise fully and check that the slit in it matches with the VOLUME MAX position.
• Turn the knob VOL unit counterclockwise fully and check that the slit in it matches with the VOLUME MIN position.
• When installing the knob SEL unit:
a. Turn the INPUT (SW803) so that the cut in it comes at
the top. (Fig. 2)
b. Install the knob SEL unit with its lock set screw posi-
tioned at the top. (Fig. 2) * At this time, do not tighten the lock set screw.
c. Keep about 0.5 mm to 0.75 mm clearance from the
front panel to knob SEL unit. (Fig. 2)
d. Match the lock set screw position with the cut in IN-
PUT (SW803) and tighten the lock set screw.
e. After installation, perform following checks.
• Turn the knob SEL unit in both directions to check that it does not rub against the front panel.
・ ノブ VOL ユニットを取り付ける場合:
a. VOLUME(VR805)を左いっぱいに回します。(Fig.2) b. ノブ VOL ユニットのスリットを “VOLUMEMIN” の位
置に合わせ、取り付けます。(Fig.2) * このとき、まだ止めネジは締めません。
c. フロントパネルから 0.5 〜 0.75mm 程度隙間をあけま
す。(Fig.2) d. 止めネジを締めます。(Fig.2) e. 取り付け後、次の動作を確認します。
・ ノブ VOL ユニットを左右に回し、フロントパネル
に擦っていないか?
・ ノブ VOL ユニットを右いっぱいに回し、ノブ VOL
ユニットのスリットが VOLUMEMAX の位置に合 うか?
・ ノブ VOL ユニットを左いっぱいに回し、ノブ VOL
ユニットのスリットが VOLUMEMIN の位置に合う か?
・ ノブ SEL ユニットを取り付ける場合:
a. INPUT(SW803)のカット位置が上になるよう回しま
す。(Fig.2) b. ノブ SEL ユニットの止めネジ位置を上にして取り付け
ます。(Fig.2)
* このとき、止めネジは締めません。 c. フロントパネルから 0.5 〜 0.75mm 程度隙間をあけま
す。(Fig.2) d. INPUT(SW803)のカット位置に止めネジ位置を合わ
せ、止めネジを締めます。(Fig.2) e. 取り付け後、次の動作を確認します。
・ ノブ SEL ユニットを左右に回し、フロントパネル
に擦っていないか?
A-S700
12
Lock set screw
止めネジ
A-S700
0.5–0.75mm
Front panel
フロントパネル
SW803
Knob SEL unit
ノブSELユニット
VOLUME MIN.
Cut
カット位置
VOLUME MAX.
Slit
スリット
VR805
Lock set screw
止めネジ
A-S700
Knob VOL unit
ノブVOLユニット
Fig. 2
13
A-S700

3. Removal of Sub-chassis Unit

a. Remove 2 screws ( ). (Fig. 3) b. Remove CB283,CB606,CB609,CB611and CB802.
(Fig. 3)
c. Remove the sub-chassis unit. (Fig. 3)
CB283
MAIN (4) P.C.B.
3. サブシャーシユニットの外し方
a. のネジ 2 本を外します。(Fig.3) b. CB283、CB606、CB609、CB611、CB802 を外します。(Fig.3) c. サブシャーシユニットを取り外します。(Fig.3)
CB609
CB606
CB611
Sub-chassis unit
A-S700
サブシャーシユニット
CB802
OPERATION (1) P.C.B.
FUNCTION (2) P.C.B.
Fig. 3
14
A-S700

When checking the P.C.B.s:

• Put the rubber sheet and cloth over this unit. Then place the P.C.B.s upside down on the cloth and check it. (Fig. 4)
• Reconnect all cables (connectors) that have been discon­nected.
• Connect the ground point of the sub–chassis unit to the chassis with a ground lead or the like. (Fig. 4)
P.C.B. をチェックする場合には:
・ 本機の上にゴムシートと布を敷き、その上に P.C.B. を
裏返しに置いてチェックします。(Fig.4) ・ 外したケーブル(コネクター)をすべて接続します。 ・ サブシャーシユニットのアースをアース線等で
シャーシに接続してください。(Fig.4)
Sub-chassis unit
サブシャーシユニット
A-S700
Ground lead
アース線
Chassis
シャーシ
Rubber sheet and cloth
ゴ ム シ ートと布
Fig. 4
15
A-S700

When checking the P.C.B.s:

• 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
15.0 mV after 60 minutes.
0.1mV–10mV (L ch)
R135
0.1mV–10mV (R ch)
● アイドリング電流の確認
1. 電源投入直後、R111 〜 135(Lch)、R112 〜 136(R ch)の端子間電圧を測定し、0.1mV から 10.0 mV の間であることを確認してください。
2. 電圧が 10.0mV を超えている場合は、R175(Lch)、 R176(Rch)をカットし、電圧を再確認してくださ い。
注意
パワーアンプ修理後に 10.0 mV を超えている場合 は、抵抗をカットする前に他に故障箇所が無いか もう一度調べてください。
3. 60 分後、電圧が 0.2 mV 〜 15.0mV であることを 確認してください。
Cut off
R111
R112
R136
R135
R136
R175 R176
R175 (L ch) R176 (R ch)
A-S700
R111
R112
17
A-S700
SCHEMATIC DIAGRAM
MAIN (1)
R135
R175
0.1 mV – 10 mV
L ch
Cut off
R 111
A-S700
R176
R112
18
Cut off
R ch
R136
0.1 mV – 10 mV
A-S700
SELF-DIAGNOSTIC FUNCTION /

Indication of Protection Information

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)
ダイアグ(自己診断機能)
● プロテクション情報の表示
本機に電源を投入して POWER インジケーターが点滅 表示している場合、プロテクションが動作している ため正常動作させることができません。 このような場合、下記の操作方法によりプロテクショ ン情報を表示することができます。 ただし、電源リレー(MAINP.C.B. の RY251)はオン しません。
・ 操作方法
* この操作方法は、電源を切った後 30 秒以内に行っ
てください。
1. “POWER” スイッチ、“CDDIRECTAMP” スイッ チ、“PUREDIRECT” スイッチを押し、それぞ れ OFF にします。(Fig.1)
2. “CDDIRECTAMP”スイッチを2回 ON/OFF し ます。(Fig.1)
3. “PUREDIRECT”スイッチを1回 ON/OFF しま す。(Fig.1)
4. “POWER” スイッチを押し、ON/STANDBY にし ます。(Fig.1) POWER インジケーターが点滅します。(Fig.2)
4. “POWER” switch
OFF ON/
STANDBY
2. “CD DIRECT AMP” switch 3. “PURE DIRECT” switch
OFF OFF
POWER indicator
1 2
ON
Fig. 1
ON
OFF
1
OFF OFF
ON
A-S700
19
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