Yamaha PC-9500-N Service Manual

PC9500N/PC4800N

POWER AMPLIFIERS

SERVICE MANUAL

このサービスマニュアルはエコパルプ
（ECF：無塩素系漂白パルプ）を使用しています。

PC9500N

CONTENTS

SPECIFICATIONS ................................................ 3/4

PANEL LAYOUT .................................... 5

BLOCK DIAGRAM

WIRING ..................................................................... 8

DIMENSIONS .......................................................... 10

DISASSEMBLY PROCEDURE ............................ 11

LSI PIN DESCRIPTION .............................. 16

IC BLOCK DIAGRAM ................................. 17

CIRCUIT BOARDS ....................................... 19

INSPECTIONS ...................................................... 30/37

PARTS LIST
OVERALL CIRCUIT DIAGRAMS

（結線図）

（目次）

（

総合仕様
（パネルレイアウト）
（ブロックダイアグラム）

（

寸法図

（ICブロック図）

（シート基板図）

（検査）

）

）

（分解手順）

（LSI端子機能表）

（総回路図）

.............................. 6

011652

PA

PC9500N: 20020925-400000
PC4800N: 20020925-330000

HAMAMATSU, JAPAN

1.361K-3611 Printed in Japan 2002.9

1

PC9500N/PC4800N

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 specifically Yamaha Products, are already known and under­stood by the users, and have therefore not been restated.

WARNING : Failure to follow appropriate service and safety procedures when servicing this product may result in per-

IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certifi-

The data provided is belived 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 changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to
exist, please contact the distributor’s Service Division.

WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body may have

IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power

sonal injury, destruction of expensive components and failure of the product to perform as specified. For
these reasons, we advise all Yamaha product owners that all service required should be performed by an
authorized Yamaha Retailer or the appointed service representative.

cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of
any form.

accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to
this bus.)

to the unit.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (Where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly
other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT
SO EVER!

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.

WARNING: THIS APPARATUS MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may

not correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:

The wire which is coloured GREEN and YELLOW must be
connected to the terminal in the plug which is marked by the letter E
or by the safety earth symbol or coloured GREEN and YELLOW.

The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.

* This applies only to products distributed by YAMAHA KEMBLE

MUSIC (U.K.) LTD.

WARNING

Components having special characteristics are marked and must be
replaced with parts having specification equal to those originally installed.

印の商品は、安全を維持するために重要な部品です。交換する場合は、

安全のために必ず指定の部品をご使用下さい。

2

PC9500N/PC4800N

SPECIFICATIONS

（総合仕様）

General Specifications

PC9500N PC4800N

120 V (US)/ 240 V (A)

Power Output Level (Rated Power) 8Ω/STEREO 1000 W x 2 1050 W x 2 550 W x 2 500 W x 2

1 kHz 4Ω/STEREO 1600 W x 2 1650 W x 2 850 W x 2 800 W x 2
THD+N= 1% 8Ω/BRIDGE 3200 W x 1 3300 W x 1 1700 W x 1 1600 W x 1

20 Hz–20 kHz 4Ω/STEREO 1400 W x 2 1500 W x 2 725 W x 2 700 W x 2
THD+N= 0.1% 8Ω/BRIDGE 2800 W x 1 3000 W x 1 1450 W x 1 1400 W x 1

1 kHz 2Ω/STEREO 2300 W x 2 2300 W x 2 1200 W x 2 1200 W x 2

20mS nonclip 4Ω/BRIDGE 4600 W x 1 4600 W x 1 2400 W x 1 2400 W x 1
Power Bandwidth Half Power 10 Hz–40 kHz (THD+N= 0.5%)
Total Harmonic Distortion (THD + N)

20 Hz~20 kHz, Half Power
Frequency Response RL= 8Ω, Po= 1 W 0 dB, 0.5 dB, –1 dB f=20 Hz–50 kHz
Intermodulation distortion (IMD)

60 Hz:7 kHz, 4:1, Half Power
Channel Separation Half Power, RL= 8Ω, 1 kHz

Residual Noise Vol. min.
SN Ratio
Damping Factor RL=8Ω, 1f= 1 kHz ≥800
Sensitivity (Vol. max.) Rated Power into 8Ω +9 dB +6 dB
Voltage Gain (Vol. max.) 32 dB
Input Impedance 30 kΩ/Balanced, 15 kΩ/Unbalanced
Controls Front Panel POWER switch (ON/OFF)

Connectors Input XLR-3-31 type/ch

Indicators POWER/STAND-BY Green/Orange

Meters 10 points LED meter
Load protection POWER switch ON muting, DC detection,
Amp. protection Temp. detection (heatsink temp ≥ 90°C), VI limiter (RL ≤ 1 Ω)
Limiter Comp. : THD ≥ 0.5%
Cooling Dual Variable-speed fan
Power Requirements US & Canada 120 V, 60 Hz

Power Consumption Idling 55 W 40 W

Dimensions (W x H x D) 480 x 88 x 456 mm
Weight 13 kg 12.5 kg
Accessories

8Ω/STEREO 925 W x 2 950 W x 2 475 W x 2 450 W x 2

≤0.1%

≤0.1%

Vol. max., input 600Ω shunt

20 Hz~20 kHz (DIN AUDIO)
20 Hz~20 kHz (DIN AUDIO)

Rear Panel MODE switch (STEREO/BRIDGE/PARALLEL)

Output SPEAKON /ch, 5-way binding posts
NETWORK RJ45
POWER AC INLET

PROTECTION Red
TEMP Red (heatsink temp ≥ 85°C)
REMOTE Green

Europe 230 V, 50/60 Hz
Other 240 V, 50/60 Hz

1/8 output power, 4Ω 120 V 750 W 230/240 V 1100 W 120 V 450 W 230/240 V 600 W
Maximum output, 4

Ω

≥70 dB

≤ –70 dB

Volume (31 position) /ch

HPFswitch (ON/OFF) /ch
DIP switch (6P)

Euroblock connector (balance)/ch

Power cord, Security cover, Owner’s Manual, Euroblock connector (2)

0 dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power)

230 V (EU)

106 dB 103 dB

4500 W 2500 W

120 V (US)/ 240 V (A)

fc=40 Hz

230 V (EU)

For European Model
Purchaser/User information specified in EN55103-1 and EN55103-2.
Inrush Current: 20A (PC9500N) / 25A (PC4800N)
Conformed Environment: E1, E2, E3 and E4.

3

PC9500N/PC4800N

一般仕様

PC9500N PC4800N

出力レベル 8 Ω/STEREO 1000W ×2 500W×2

1kHz 4 Ω/STEREO 1500W ×2 750W×2
THD＋N=1% 8Ω/BRIDGE 3000W×1 1500W ×1

8Ω/STEREO 900W×2 450W×2
20Hz〜20kHz 4Ω/STEREO 1300W ×2 650W ×2
THD＋N=0.1% 8Ω/BRIDGE 2600W×1 1300W ×1

1kHz 2 Ω/STEREO 2200W ×2 1100W×2
20mSnonclip 4 Ω/BRIDGE 4400W×1 2200W ×1

出力帯域幅 HalfPower 10Hz〜40kHz（THD＋N=0.5%）
全高調波歪率（THD ＋N）

20Hz 〜20kHz、HalfPower
周波数特性
混変調歪率

60Hz：7kHz、4：1、HalfPower
チャンネル間セパレーション

ボリューム.max. 入力600 Ωシャント

残留ノイズ ボリュームmin. 20Hz〜20kHz(DINAUDIO) ≦−70dB
SN比 20Hz 〜20kHz(DINAUDIO) 106dB 103dB
ダンピングファクター RL=8Ω、1f＝1kHz ≧800
入力感度（ボリュームmax.）RatedPower 8 Ω +9dB +6dB
ボルテージゲイン（ボリュームmax.） 32dB
入力インピーダンス 30kΩ／バランス型、15k Ω／アンバランス型
コントロール フロントパネル POWERスイッチ：ON/OFF

コネクター INPUT XLR-3-31タイプ

インジケーター POWER/STAND-BY 緑／オレンジ

レベルメーター 10ポイントLED メーター
ロードプロテクション Powerスイッチオンミュート、DC 検出、
アンププロテクション 温度検出（ヒートシンク温度≧90℃）、VIリミッタ−（RL ≦1Ω）
リミッター コンプ：THD≧0.5％
クーリング 連続可変式ファン
電源 100V、50/60Hz
消費電力 無信号 55W 40W

最大外形寸法（W×H×D） 480×88×456mm
重量 13kg 12.5kg
付属品 電源コード（PC4800N）、セキュリティカバー、取扱説明書、

RL＝

8Ω、Po＝1W 0dB、＋0.5dB、−1dB f＝20Hz 〜50kHz

HalfPower RL＝8Ω1kHz

リアパネル MODE スイッチ：STEREO/BRIDGE/PARALLEL

OUTPUT スピコン（チャンネル単位）、5ウェイバインディング・ポスト

NETWORK RJ45

POWER ACインレット（PC4800N）

PROTECTION 赤

TEMP 赤（ヒ−トシンク温度≧85℃）

REMOTE 緑

1/8出力、4 Ω 950W 500W

最大出力、4Ω 4500W 2500W

≦0.1%

≦0.1%

≧70dB

ボリューム：31ポジション（チャンネル単位）

HPFスイッチ：ON/OFF（チャンネル単位） fc＝40Hz
DIPスイッチ（6P）

ユーロブロックコネクター（バランス）（チャンネル単位）

ユーロブロックコネクター（2 個）

0dB＝0.775Vrms,HalfPower＝1/2PowerOutputLevel（RatedPower）

4

PC9500N/PC4800N

In case of PC9500N (J)

（PC9500N（J）の場合）

PANEL LAYOUT

Front Panel

（フロントパネル）

1

POWER/STAND-BY switch and indicator

2

REMOTE indicator

3

PROTECTION indicator

4

TEMP indicator

5

Level meters

6

Volume knobs

7

Air intakes

8

Security cover

（パネルレイアウト）

1

POWER/STAND-BYスイッチ、インジケーター

2

REMOTEインジケーター

3

PROTECTIONインジケーター

4

TEMPインジケーター

5

レベルメーター

6

ボリュームツマミ

7

吸気口

8

セキュリティカバー

Rear Panel

（リアパネル）

1

XLR inputs

2

MODE switch

3

HPF 40 switches

4

SPEAKERS jacks

5

DATA ports

6

AMP ID switch

7

Euroblock connector

8

AC inlet (only PC4800N)

9

GND terminals

1

XLR入力端子

2

MODEスイッチ

3

HPF40スイッチ

4

SPEAKERS端子

5

DATAポート

6

AMPIDスイッチ

7

ユーロブロックコネクター

8

ACインレット（PC4800N）

9

GND端子

5

PC9500N/PC4800N

N

BLOCK DIAGRAM

IN 1/5

JK403

JK401

JK402

IC401

3

2

CN402-35P
CN401-35P

IN 5/5

CN401-35P
CN402-35P

IC401

5

6

1

7

INPUT

（ブロックダイアグラム）

SW401

-1/4

CN405-37P

*1

IC402-1/2

SW402-1/2

IC403-1/2

*1

SW402-2/2

IC402-2/2

*1

RY401

CN407-7P

CN406-7P

IN 3/5

A ATT
VR401

IC403-2/2

CN407-7P

B ATT
VR402

CN406-7P

RY402

CN407-7P

CN407-7P

CN406-7P

IN 2/5

A ATT

IC408 1/2

B ATT

IC408 2/2

LD704

CN701-11P

CN601-11P

RY403-1/2

RY403-2/2

IC406

SW401

-2/4

-3/4

-4/4

*1

A

JK801

JK802

SW801

PS10 2/2
PS5 2/2

Power Supply

CN801-37P

IC802

SW101

CN101-4P

CN801-37P
CN405-37P

Clock

6.4512M

91, 92

57~60

102
104

6

7
72
74

54 66 4

CN602-9P
CN102-9P

17 5

IC801

112P

IN 4/5

70, 69

93, 98

95, 96

10, 11

94, 99

CN801-37P

CN105-1P
CN106-1P
CN107-1P
CN108-1P
CN109-1P
CN110-1P

CN405-37P

YE

BL
BR

YE

BL
BR

to PA Ach

to PA Bch

CN701-11P

LD706

PS10 1/2
PS5 1/2

CN102-9P

CN602-9P

I

*1:IN 5/5

A'

6

PC9500N/PC4800N

A

IN 2/5

/4
/4
/4

401

SP602

1 ­1 +
2 +
2 -

SP601

SP603

IN 2/5

LD701

2

A ch

1

1

B ch

2

Q420

CN403

-3P

PA

CN201-3P

CN202-6P

CN603-6P

NF

IC201

+B -B GND

CN205-2P

CN202

-6P

RE

CN609-2P

CN605

-1P

CN603-6P

CN701-11P

CN601-11P

*1

Q418

CN404

-3P

PA

CN201-3P

CN202-6P

CN604-6P

NF

IC201

+B -B GND

CN205-2P

CN202

-6P

RE

CN610-2P

CN608-1P

CN604-6P

CN601-11P

CN701-11P

LD705

1-11P

706

LD703

CN601-11P
CN701-11P

CN701-11P

LD702

CN601-11P

PS10 1/2
PS5 1/2

CN104-2P

CN602-9P
CN102-9P

FAN DRIVE

Q115-117

CN103-2P

IN 2/5

A'

(A) (B)

38CA1-8821493

7

PC9500N/PC4800N

WIRING

（基板結線図）

B

IN 3/5

B ch

PA

PC4800N only

IN 4/5

PS

IN 1/5

IN 5/5

8

B'

0N only

PC9500N/PC4800N

B

IN 2/5

A ch

PA

38C99-8823966 2

B'

9

PC9500N/PC4800N

DIMENSIONS

（寸法図）

26

380

456

25 30 370 30 25

480

4

46

88

Units: mm

（単位）

10

PC9500N/PC4800N

DISASSEMBLY PROCEDURE

（分解手順）

1. Top Cover (Time required: about 2 minutes)

1-1 Remove the nine (9) screws marked [260]. The top

cover can then be removed. (Fig. 1)

2. Rear Assembly (Time required: about 4 minutes)

2-1 Remove the top cover. (See Procedure 1.)
2-2 Remove the six (6) screws marked [220]. The rear

assembly can then be removed. (Fig. 2)

With PC9500N of the J specification, remove the
screw marked [70]. (Fig.1)

[260]

[260]

[260]

1. トップカバー（所要時間：約 2分）

1-1 [260]のネジ9本を外し、トップカバーを外します。

(Fig.1)

2. リア Assy（所要時間：約4分）

2-1 トップカバーを外します。(1項参照)
2-2 [220]のネジ6 本を外し、リア Assy を外します。

(Fig.2)

  ※PC9500N(J)仕向は[70]のネジを外します。(Fig.1)

[40b]

[70]

[65]

I/O Rock

PS 1/2

[90]

IN 4/5

[260]

[40b]

[40]: Bind Head Screw 3.0X4 MFZN2BL (VR139400)
[70]: Bind Head Screw 4.0X8 MFZN2BL A4.0X8 (VP156800)
[90]: Bind Head Screw 3.0X4 MFZN2BL (VR139400)
[260]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)

＋バインド小ネジ
＋バインド小ネジ
＋バインド小ネジ
    ボンディングＢタイト

Fig.1

[R310]

[220] [220]

[220]

[40a]

[220]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)
[290]: Bind Head Screw 4.0X8 MFZN2BL (VP156800)

ボンディングBタイト
＋バインド小ネジ

Fig.2

11

PC9500N/PC4800N

3. IN 1/5 Cir cuit Board (Time required: about 5 min utes)

3-1 Remove the top cover. (See Procedure 1.)
3-2 Remove the rear assembly. (See Procedure 2.)
3-3 Remove the two (2) screws marked [R310] and then

remove the SP terminal cover. (Fig. 2)

3-4 Remove the one (1) screw marked [R50] , two (2)

screws marked [R60] , four (4) scre ws marked [R70]
and four (4) screws marked [R75]. The IN 1/5 circuit
board can then be removed. (Fig. 3)

4. IN 4/5 Cir cuit Board (Time required: about 5 min utes)

4-1 Remove the top cover. (See Procedure 1.)
4-2 Remove the rear assembly. (See Procedure 2.)
4-3 Remove the four (4) screws marked [40a]. The IN 4/5

circuit board can then be removed. (Fig. 1)

5. IN 5/5 Circuit Board (Time required: about 3 minutes)

5-1 Remove the top cover. (See Procedure 1.)
5-2 Remove the two (2) screws marked [R40]. The IN 5/

5 circuit board can then be removed. (Fig. 3)

3. IN 1/5 シート（所要時間：約5分）

3-1 トップカバーを外します。(1項参照)
3-2 リア Assyを外します。(2項参照)
3-3 [R310]のネジ2本を外し、ＳＰターミナルカバーを

外します。(Fig.2)

3-4 [R50]のネジ1本と、[R60]のネジ2本、[R70]のネジ4

本、[R75]のネジ4本を外し、IN1/5シートを外しま
す。(Fig.3)

4. IN 4/5 シート（所要時間：約5分）

4-1 トップカバーを外します。(1項参照)
4-2 リア Assyを外します。(2項参照)
4-3 [40a]のネジ4 本を外し、IN4/5シートを外します。

(Fig.1)

5. IN 5/5 シート（所要時間：約3分）

5-1 トップカバーを外します。(1項参照)
5-2 [R40]のネジ2 本を外し、IN5/5シートを外します。

(Fig.3)

IN 1/5

[R20a][R30][R20c]

[R70] [R70] [R50] [R75] [R75][R60] [R10]

[R40]

IN 5/5

[R40]: Pan Head Screw 2.6X6 MFZN2BL (VC990500)
[R50]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[R60]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)
[R70]: Bind Head Tapping Screw-B 2.6X8 MFZN2BL (VB096700)
[R75]: Flat Fillister H. Tapping 3.0X8 MFZN2BL (V9568800)

Fig.3

＋ナベ小ネジ
    ボンディングBタイト
     ＋バインドＢタイト
     ＋バインドＢタイト
   ＋平頭Bタイト

6. Front Panel Assembly (Time required: about 4 minutes)

6-1 Remove the three (3) screws marked [190a] from

the side cover L, three (3) screws marked [190b]
from the side cover R and two (2) screws marked
[200]. The front panel assembly can then be

12

removed. (Fig. 4)

6. フロントパネル Assy（所要時間：約4分）

6-1 サイドカバーＬ[190a]のネジ3 本とサイドカバーR

[190b]のネジ3本を外し、[200]のネジ2本を外し、フ
ロントパネル Assyを外します。(Fig.4)

PC9500N/PC4800N

PS 1/2

IN 1/5

[190b]

Side Cover R

（サイドカバーR）

[170]

[170]

[190a]

[200]

Side Cover L

（サイドカバーL）

[F180]

[F30]

[F30] [F30]

[F30] Front cover

Front cover

[F180]

（フロントカバー）

（フロントカバー塗装上り）

[170]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)
[190]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)
[200]: Bind Head Screw 3.0X4 MFZN2BL (VR139400)

7. DC Fan (Time required: about 4 minutes)

7-1 Remove the top cover. (See Procedure 1.)
7-2 Remove the front panel assembly . (See Procedure 6.)
7-3 Remove the two (2) screws marked [F30] from the

DC fan and then remove the fan. Use the same for
both right and left fans. (Fig. 5)

8. Power Switch (Time required: about 8 minutes)

8-1 Remove the top cover. (See Procedure 1.)
8-2 Remove the front panel assembly . (See Procedure 6.)
8-3 Remove the DC fans. (See Procedure 7.)
8-4 Remove the four (4) screws marked [F180] and then

remove the two front covers. (Fig. 5)

8-5 Remove the six (6) screws marked [F150] and then

remove the front panel. (Fig. 6)

8-6 Remove the Power switch knob and the two (2)

screws marked [F40]. The power switch (PS 2/2
circuit board mount) can then be removed. (Fig. 6)

8-7 Remove the power switch from the PS 2/2 circuit

board.

ボンディングBタイト
    ボンディングBタイト
＋バインド小ネジ

Fig.4

7. DC ファン（所要時間：約4分）

7-1 トップカバーを外します。(1項参照)
7-2 フロントパネル Assyを外します。(6項参照)
7-3 DCファンの[F30]のネジ2本を外し、ファンを外し

ます。左右とも同じ方法で外せます。(Fig.5)

8. パワースイッチ（所要時間：約 8分）

8-1 トップカバーを外します。(1項参照)
8-2 フロントパネル Assyを外します。(6項参照)
8-3 DC ファンを外します。(7項参照)
8-4 [F180]のネジ4本を外し、フロントカバー及びフロ

ントカバー塗装上がりを 2ケ所外します。(Fig.5)

8-5 [F150]のネジ6本を外し、フロントパネルを外しま

す。(Fig.6)

8-6 PSWノブを外し、[F40]のネジ2本を外し、パワー

スイッチ（PS2/2シートにマウント）を外します。
(Fig.6)

8-7 PS2/2 シートからパワースイッチを外します。

[F30]: Bind Head Screw 4.0X30 MFZN2BL (VT229100)
[F180]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)

Fig.5

＋バインド小ネジ
 ＋バインドBタイト

13

PC9500N/PC4800N

9. IN 2/5 Circuit Board (Time required: about 4 minutes)

9-1 Remove the top cover. (See Procedure 1.)
9-2 Remove the front panel assembly . (See Procedure 6.)
9-3 Remove the DC fans. (See Procedure 7.)
9-4 Remove the four (4) screws mark ed [F180] and then

remove the two front covers. (Fig. 5)

9-5 Remove the six (6) screws mark ed [F150] and then

remove the front panel. (Fig. 6)

9-6 Remove the two (2) scre ws marked [F70]. The IN 2/

5 circuit board can then be removed. (Fig. 6)

10. IN 3/5 Circuit Board (Time required: about 4 minutes)

10-1 Remove the top cover. (See Procedure 1.)
10-2 Remove the front panel assembly . (See Procedure 6.)
10-3 Remove the DC fans. (See Procedure 7.)
10-4 Remove the two front covers. (See Step 9-4.)
10-5 Remove the front panel. (See Step 9-5.)
10-6 Remove the two (2) knobs of attenuation A/B and

two (2) hexagonal nuts. The IN 3/5 circuit board can
then be removed. (Fig. 6)

[F150]

9. IN 2/5 シート（所要時間：約4分）

9-1 トップカバーを外します。(1項参照)
9-2 フロントパネル Assyを外します。(6項参照)
9-3 DC ファンを外します。(7項参照)
9-4 [F180]のネジ4本を外し、フロントカバー及びフロ

ントカバー塗装上がりを 2ケ所外します。(Fig.5)

9-5 [F150]のネジ6本を外し、フロントパネルを外しま

す。(Fig.6)

9-6 [F70]のネジ2本を外し、IN 2/5 シートを外しま

す。(Fig.6)

10. IN 3/5 シート（所要時間：約 4 分）

10-1 トップカバーを外します。(1項参照)
10-2 フロントパネル Assyを外します。(6 項参照)
10-3 DCファンを外します。(7項参照)
10-4 フロントカバー及びフロントカバー塗装上がりを2

ケ所外します。(9-4.項参照)
10-5 フロントパネルを外します。(9-5.項参照)
10-6 アッテネーターA/Bのツマミ２ケとVRの六角ナッ

ト２ケを外し、IN 3/5シートを外します。(Fig.6)

[F80]

IN 3/5

PS 2/2

[F60]

[F150]

[F40]: Bind Head Screw 3.0X6 MFZN2BL (EG330360)
[F70]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)
[F150]: Flat Head Screw 4.0X8 MFZN2BL (VA221200)

11. PA Unit (Time required: about 7 minutes)

11-1 Remove the rear assembly. (See Procedure 2.)
11-2 Remove the top cover. (See Procedure 1.)
11-3 Remove the nine (9) screws marked [170] and three

(3) screws marked [190]. The side co v er and PA unit
can then be removed. Use the same method f or both
A and B channels. (Fig. 4)

12. PA Circuit Board (Time required: about 11 minutes)

12-1 Remove the top cover. (See Procedure 1.)
12-2 Remove the PA unit. (See Procedure 11.)
12-3 Remove the screws fixing the pair transistor , FET and

diode marked [P70] (33 screws for PC9500N, 25
screws for PC4800N), three (3) screws mark ed [P76]
and six (6) screws marked [P40]. The PA circuit board

14

can then be removed. (Fig. 8)

Power Switch knob

（PSWノブ）

Fig.6

11. PA ユニット（所要時間：約 7 分）

11-1 リア Assyを外します。(2 項参照)
11-2 トップカバーを外します。(1項参照)
11-3 [170]のネジ9本と[190]のネジ 3 本を外し、サイド

12. PA シート（所要時間：約 11 分）

12-1 トップカバーを外します。(1項参照)
12-2 PA ユニットを外します。(11項参照)
12-3 ペアートランジスター、FET とダイオードの止め

[F10]

[F40]

（アッテネーターノブ）

[F70]

IN 2/5

＋バインド小ネジ
     ＋バインドＢタイト
＋皿小ネジ

Attenuation knob

Hexagonal nut

（六角ナット）

カバーを外し、PAユニットを外します。A,Bチャン
ネルとも同じ方法で外れます。(Fig.4)

ネジ[P70]（PC9500N：33本、PC4800N：25 本）と
[P76]のネジ3 本、[P40]のネジ6本を外し、PAシー
トを外します。(Fig.7)

PC9500N/PC4800N

PA5: not installed

[P40]

PA5: not installed

PA5: not installed

[P76]

[P70]

[P70]

[P40]

[P40]

PA5: not installed

[P70]

[P40]: Bind Head Screw 3.0X6 MFZN2BL (EG330360)
[P70]: Bind Head Screw-SP 3.0X12 MFZN2Y (VB763800)
[P76]: Bind Head Screw-SP 2.6X8 MFZN2Y (EG320240)

13. PS Circuit Board

(Time required: about 8 minutes)

13-1 Remove the top cover. (See Procedure 1.)
13-2 Remove the front panel assembly . (See Procedure 6.)
13-3 Remove the rear assembly. (See Procedure 2.)
13-4 Remove the eleven (11) screws marked [40b], one

(1) screw marked [90] and one (1) screw marked
[70] and then release the I/O lock marked [65]. The
PS circuit board can then be removed. (Fig. 1)
[65]: PC9500N (J) is not used.

[P76]

[P70]

＋バインド小ネジ
 ＋バインド小ネジ
＋バインド小ネジ

Fig.7

13. PS シート（所要時間：約 8 分）

13-1 トップカバーを外します。(1項参照)
13-2 フロントパネルAssyを外します。(6 項参照)
13-3 リアAssyを外します。(2 項参照)
13-4 [40b]のネジ11本と[90]のネジ1本と[70]のネジ1本

を外し、[65]のI/Oロックを外し、PSシートを外し
ます。(Fig.1)
[65]:PC9500N（J）は使用していません。

15

PC9500N/PC4800N

LSI PIN DESCRIPTION

（LSI端子機能表）

HD6437042AF28 (X2263100) CPU

PIN
NO.

1

TIOC4/DACK0/PE14

2

PE15

3

VSS
4
5
6
7
8
9

10
11
12
13
14

A10

15

A11

16

A12

17

A13

18

A14

19

A15

20

A16

21

VCC

22

A17

23

VSS

/RAS/PB2

24

/CASL/PB3

25
26

/CASH/PB4

27

VSS

28

/RDWR / PB5

A18//BACK/PB6

29

A19//BREQ/PB7

30

A20/PB8

31

A21/PB9

32

VSS

33
34

/RD

35

/WDTOVF

36

/WRH

VCC

37

/WRL

38

VSS

39

/CS1

40

/CS0

41

/IRQ3/TCLKD/PA9

42

TCLKC//IRQ2 /PA8

43

/CS3

44

/CS2

45

/IRQ1/PA5

46

TXD1

47

RXD1

48

/IRQ0/PA2

49

TXD0

50

RXD0

51

D15

52

D14

53

D13

54

VSS

55

D12

56

A0
A1
A2
A3
A4
A5
A6
A7
A8
A9

I/O FUNCTIONNAME

I/O

O
O

O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O

O

I/O
I/O
I/O

I/O
I/O
I/O

O
O

O
O
O

O
O

O
I/O
I/O

O

O
I/O

O
I/O

O
I/O

I/O
I/O

I/O

MTU I/O / DMA acknowledge / Port E

I

I
I

I

I

I
I

I

I

I

Port E
Ground

Address bus

Power supply
Address bus
Ground
Row address strobe / Port B
Column address strobe (low) / Port B
Column address strobe (high) / Port B
Ground
DRAM read / write / Port B
Address bus / Bus acknowledge / Port B
Address bus / Bus request / Port B

Address bus/ Port B
Ground

Read
Watch dog timer overflow
High write
Power supply
Low write
Ground
Chip select
Chip select
Interrupt request / Timer clock/ Port A
Timer clock / Interrupt request / Port A
Chip select
Chip select
Interrupt request / Port A
Data transmission
Data reception
Interrupt request / Port A
Data transmission
Data reception

Data bus
Ground

Data bus

PIN
NO.

57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

PA15 / CK

84

PE0/DREQ0

85

PE1/DRAK0

86
87
88
89
90

PF0 / AN0

91

PF1 / AN1

92

PF2 / AN2

93

PF3 / AN3

94

PF4 / AN4

95

PF5 / AN5

96
97

PF6 / AN6

98

PF7 / AN7

99
100
101
102
103
104
105
106
107
108
109
110
111
112

D11
D10

D9
D8

VSS

D7
D6
D5

VCC

D4
D3
D2
D1
D0

VSS

XTAL

MD3

EXTAL

MD2

NMI
VCC
MD1
MD0

PLLVCC
PLLCAP
PLLVSS

/RES

PE2

PE3

PE4
VSS

AVSS

AVCC

VSS

PE5
VCC

PE6

PE7

PE8

PE9

PE10

VSS

PE11
PE12

/MRES

I/O FUNCTIONNAME

I/O
I/O
I/O
I/O

I/O
I/O
I/O

I/O
I/O
I/O
I/O
I/O

O

I/O

O
O
O
O

O

I/O
I/O
I/O

O
O

O
O

PC9500N IN10: IC801

PC4800N IN5: IC801

Data bus

I

I

I
I
I
I
I
I
I
I
I
I
I
I

I

I
I
I
I
I
I
I
I
I
I
I
I

I

I

I

Ground
Data bus
Power supply

Data bus

Ground
Crystal oscillator
Mode control
Crystal oscillator
Mode control
Non-maskable interrupt request
Power supply
Mode control
Mode control
PLL Power supply
PLL capacitor
PLL Ground
Port A / Clock
Power on reset
Port E / DMA request
Port E / DMA acknowledge

Port E
Ground

Port F / Analog input

Analog ground
Port F / Analog input
Power supply

Ground
Port E
Power supply

Port E

Ground
Port E
Manual reset

16

PC9500N/PC4800N

IC BLOCK DIAGRAM

●

NJM4558M(T1)

PC9500M IN10: IC601, IC602, IC603,

PC4800M IN5: IC601, IC602, IC603,

●

NJM2068MD-T1

PC9500M IN10: IC402, IC403, IC404,

PC4800M IN5: IC402, IC403, IC404,

●

M5238AFP

PC9500M IN10: IC401
PC4800M IN5: IC401

OP AMP

Output A
Inverting

Input A

Non-Inverting

Input A
Ground

(IG103520)

IC604, IC605, IC606

IC604, IC605, IC606

(XJ553A00)

IC405, IC406, IC407

IC405, IC406, IC407

(XL669A00)

1

2

+-

3

+-

4

8

7

6

5

+DC Voltage
Supply

Output B

Inverting
Input B

Non-Inverting
Input B

（IC ブロック図）

TC7W14FU (XN883A00

PC9500M IN10: IC804
PC4800M IN5: IC804

INVERTER

1

2

3Y

2A

3

GND

4

●

SG3525AN

(X2383A00)

PC9500M PS10: IC101
PC4800M PS5: IC101

REGULATOR

81A

7

6

5

●

)

DS36276M

(X2155A00)

PC9500M IN10: IC802
PC4800M IN5: IC802

TRANSCEIVER

CC

Vcc

1Y

3A

2Y

1

RO

RE

DE

DI

R

2

3

D

4

V

8

DO/RI

7

6

DO/RI

GND

5

●

TC9413AP

(X2101A00)

PC9500M IN10: IC408
PC4800M IN5: IC408

VOLUME

1V

SS

2

OUT

3

IN

L-ch

A-GND

CS1

GND

4

NC

5

6

7

8

CK

IN

NC

A-GND

CS2

STB

DATA

DSCILLATDR

E/A

R-ch

REFERENCE
REGULATOR

FLIP/
FLOP

PWM

50µA

5K

+V

IN

13

V

C

A

B

11

OUTPUT A

14

OUTPUT B

GROUND

12

8

10

SOFT-START

SHUTDOWN

5K

1INV. INPUTN

2

N.I. INPUT

3

SYNC

OSC. OUTPUT

DISCHARGE

SOFT-START

DD

V

16

OUT

15

IN

14

13

12

11

10

R-ch

NC

A-GND

CS2

STB

9

DATA

4

5

C

T

6

R

T

7

8

2

OUT OUT

3

IN

L-ch

A-GND

GND

4

NC

5

6

CS1

CK

Level

7

circuit

8

16

15

14

13

12

11

10

9

Data latch

circuit

shift

REF

V

+V

IN

OUTPUT B

V

C

GROUND

OUTPUT A

SHUTDOWN

COMPENSATION

SS

V

1 16

L-ch

Shift register (13bit)

Strobe generation circuit

V

DD

R-ch

Data latch

circuit

V

OSC. OUTPUT

SYNC

DISCHARGE

COMPENSATION

INV. INPUTN

N.I. INPUT

Level

shift

circuit

16 15

REF

4

3

R

6

T

7

C

5

T

9

1
2

15

14

13

12

11

10

9

17

PC9500N/PC4800N

●

IR2110

(X2382A00)

PC9500M PS10: IC103,IC104
PC4800M PS5: IC103,IC104

DRIVER

1LC

2

COM

3

VCC

4

5

VS

6

VB

HC

7

6

UV

VDD

14

VSS

13

LIN

12

SD

11

HIN

10

9

VDD

8

9

Q

R

HIN

10

SD

11

14

LIN

VSS

15

S

S

Q

R

VDD/VCC
LEVEL
SHIFT

VDD/VCC
LEVEL
SHIFT

PULSE

PULSE

GEN

GEN

HV
LEVEL
SHIFT

DETECT

PULSE

FILTER

UV

DETECT

DELAY

R

Q
R
S

VB

7

HO

5

VS

3

CC

V

LO

1

COM

2

●

LB1409M

(X0654A00)

PC9500M IN10: IC701, IC702
PC4800M IN5: IC701, IC702

LED DRIVE

1VCC

2

Vref1

+

3

IN

V

–

4

V

IN

OUT

5

GND

6

D1

7

8D2

13, 12, 11, 10, 9, 8
R7(2.34K), R6(1.66K), R5(1.17K)

CC

16

Vref2

D9

15

D8

14

D7

13

D6

12

11

D5

D4

10

9

D3

+

3

VIN

–

4

V

IN

Vref 1 Vref 2V

5 6

OUT

2 1

R10
10K

GND

16 15

R20

5

D9

4.69K
R9

–

COM

+

98 1

3.31K

–

+

R8

COM

R4(830), R3(586), R2(414)

D8 D1

14 7

–

+

1K

R1

COM

18

PC9500N/PC4800N

CIRCUIT BOARDS

CONTENTS

IN 1/5 Circuit Board (X2073C0)..................................................... 20

IN 2/5 Circuit Board (X2073C0)..................................................... 22

IN 3/5 Circuit Board (X2073C0)..................................................... 22

IN 4/5 Circuit Board (X2073C0)..................................................... 23

IN 5/5 Circuit Board (X2073C0)..................................................... 23

PA Circuit Board (X2074C0) ......................................................... 24

PS10 1/2 Circuit Board (X2348C0)................................................ 26

PS10 2/2 Circuit Board (X2348C0)................................................ 26

PS5 1/2 Circuit Board (X2349C0).................................................. 28

PS5 2/2 Circuit Board (X2349C0).................................................. 28

Note: See parts list for details of circuit board component parts.

注：シートの部品詳細はパーツリストをご参照下さい。

（目次）

（シート基板図）

19

PC9500N/PC4800N

f

o

IN 1/5 Circuit Board (PC9500N: IN10, PC4800N: IN5)

SPEAKERS

from PS-W102

from PS-W103

from PA ACH-CN205

from PA ACH-W204

A2 B2

--

OUTPUT

+

+

A

from PA BCH-W204

from PA ACH-CN205

GND

CN603: to PA ACH-CN202

CN601: to IN 2/5-CN701

CN604: t

CN602:

A'

B

20

B'

IN: 3NA-V848170

A

PA BCH-W204

ACH-CN205

B2 A

GND

PC9500N/PC4800N

B

from PA ACH-CN201
from PA BCH-CN201

CN402: to IN 5/5-CN401

CN406: to IN 3/5-CN407

CH-CN202

to IN 2/5-CN701

B

CN604: to PA BCH-CN202

CN602: from PS-CN102

A'

CN405: to IN 4/5-CN801

Component side

（部品側）

B'

IN: 3NA-V848170

Pattern side

（パターン側）

21

PC9500N/PC4800N

IN 2/5 Circuit Board

CN701: to IN 1/5-CN601

IN 3/5 Circuit Board

Component side

Pattern side

（パターン側）

（部品側）

22

CN407: to IN 1/5-CN406

Component side

（部品側）

Pattern side

（パターン側）

IN: 3NA-V848170

PC9500N/PC4800N

IN 4/5 Circuit Board

CN801: to IN 1/5-CN405

IN 5/5 Circuit Board

CHANNEL INPUT

HPF 40Hz BRIDGE

from IN 1/5-CN402

Component side

（部品側）

DATA PORT

AMP ID

Component side

（部品側）

Pattern side

（パターン側）

IN: 3NA-B848170

Pattern side

（パターン側）

23

PC9500N/PC4800N

P
P

PA Circuit Board (PC9500N: PA10, PC4800N: PA5)

N.C

Q235N Q236N Q237N Q238N Q239N Q240N Q241N Q234N Q221N

PA ACH:
from IN 1/5

-CN609
PA BCH:

from IN1/5

-CN610

PA ACH:
from IN 1/5

-CN403
PA BCH:

from IN 1/5

-CN404

PA ACH: from IN 1/5-CN603
PA BCH: from IN 1/5-CN604

C

Q235P Q236P Q237P Q238P Q239P Q240P Q241P Q234P Q212

N.C

PA ACH: to IN 1/5-CN605
PA BCH: to IN 1/5-CN608

C'

D

24

D'

PA: 3LP-X2074A0

C

PA ACH: to PS-CN105
PA BCH: to PS-CN108

Q242N Q243N Q243N Q244N Q245N Q228 Q230 Q232 D241

Q242P Q243P Q243P Q244P Q245P Q229 Q231 Q233 D242

PA ACH: to PS-CN106
PA BCH: to PS-CN109

C'

D

PA ACH: to PS-CN107
PA BCH: to PS-CN110

Following semi-conductors

are installed for the PA unit.

（下記半導体はPAユニットで取付さ
 れます。）

Component side（部品側）

PC9500N/PC4800N

Circuit board

ref.

PA10 PA5
D242
Q233
Q231
Q229
Q245P
Q244P
Q243P
D235
Q242P
Q212
Q234P
Q241P
Q240P
Q239P
Q238P
Q237P
Q236P
Q235P
Q235N
Q236N
Q237N
Q238N
Q239N
Q240N
Q241N
Q234N
IC201
Q242N
D234
Q243N
Q244N
Q245N
Q228
Q230
Q232
D241

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D'

PA: 3LP-X2074A0

Pattern side

（パターン側）

25

26

AC IN

from PA ACH-W203

to IN 1/5-CN606

from PA ACH-W202

from PA ACH-W201

to IN10 1/5

-CN602

from FAN ACH

from FAN BCH

from PA BCH-W203

to IN10 1/5-CN607

from PA BCH-W201

POWER ON/OFF

from PA BCH-W202

PC9500N/PC4800N

PS10 1/2 Circuit Board (PC9500N)

Component side（部品側）

(PC9500N)

PS10 2/2 Circuit Board

PS10: 3LP-X2348A0

Component side（部品側）