Yamaha PC4800N User manual

PC9500N/PC4800N
1
SERVICE MANUAL
PA 011652
PC9500N: 20020925-400000
PC4800N: 20020925-330000 1.361K-3611 Printed in Japan 2002.9
HAMAMATSU, JAPAN
CONTENTS
SPECIFICATIONS ................................................ 3/4
PANEL LAYOUT .................................... 5
BLOCK DIAGRAM .............................. 6
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
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。
POWER AMPLIFIERS
PC9500N
（ 総合仕様 ）
（パネルレイアウト）
（ブロックダイアグラム）
（結線図）
（
寸法図 ）（分解手順）
（LSI端子機能表）
（ICブロック図）
（シート基板図）
（検査）
（総回路図）
（目次）

PC9500N/PC4800N
2
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.
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 under-
stood 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-
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.
IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certifi-
cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of
any form.
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
accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to
this bus.)
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power
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.
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。

PC9500N/PC4800N
3
General Specifications
PC9500N PC4800N
120 V (US)/ 240 V (A) 230 V (EU) 120 V (US)/ 240 V (A) 230 V (EU)
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
8Ω/STEREO 925 W x 2 950 W x 2 475 W x 2 450 W x 2
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 ≤0.1%
Frequency Response R L = 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 ≤0.1%
Channel Separation Half Power, R L = 8Ω, 1 kHz ≥70 dB
Vol. max., input 600Ωshunt
Residual Noise Vol. min. 20 Hz~20 kHz (DIN AUDIO) ≤–70 dB
SN Ratio 20 Hz~20 kHz (DIN AUDIO) 106 dB 103 dB
Damping Factor R L =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)
Volume (31 position) /ch
Rear Panel MODE switch (STEREO/BRIDGE/PARALLEL)
HPFswitch (ON/OFF) /ch
fc=40 Hz
DIP switch (6P)
Connectors Input XLR-3-31 type/ch
Euroblock connector (balance)/ch
Output SPEAKON /ch, 5-way binding posts
NETWORK RJ45
POWER AC INLET
Indicators POWER/STAND-BY Green/Orange
PROTECTION Red
TEMP Red (heatsink temp ≥85°C)
REMOTE Green
Meters 10 points LED meter
Load protection POWER switch ON muting, DC detection,
Amp. protection Temp. detection (heatsink temp ≥90°C), VI limiter (R L ≤1 Ω )
Limiter Comp. : THD ≥0.5%
Cooling Dual Variable-speed fan
Power Requirements US & Canada 120 V, 60 Hz
Europe 230 V, 50/60 Hz
Other 240 V, 50/60 Hz
Power Consumption Idling 55 W 40 W
1/8 output power, 4Ω120 V 750 W 230/240 V 1100 W 120 V 450 W 230/240 V 600 W
Maximum output, 4 Ω 4500 W 2500 W
Dimensions (W x H x D) 480 x 88 x 456 mm
Weight 13 kg 12.5 kg
Accessories
Power cord, Security cover, Owner’s Manual, Euroblock connector (2)
0 dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power)
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.
SPECIFICATIONS
（総合仕様）

PC9500N/PC4800N
4
一般仕様
PC9500N PC4800N
出力レベル 8Ω/STEREO 1000W×2 500W×2
1kHz 4Ω/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 2Ω/STEREO 2200W×2 1100W ×2
20mSnonclip 4Ω/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 ≦0.1%
周波数特性 RL＝ 8Ω、Po＝1W 0dB、＋0.5dB、−1dB f＝20Hz 〜50kHz
混変調歪率
60Hz：7kHz、4：1、HalfPower ≦0.1%
チャンネル間セパレーション
HalfPower RL＝8Ω1kHz
ボリューム.max. 入力600Ωシャント ≧70dB
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、15kΩ／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
ボリューム：31 ポジション（チャンネル単位）
リアパネル MODEスイッチ：STEREO/BRIDGE/PARALLEL
HPFスイッチ：ON/OFF（チャンネル単位） fc＝40Hz
DIPスイッチ（6P）
コネクター INPUT XLR-3-31タイプ
ユーロブロックコネクター（バランス）（チャンネル単位）
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）
インジケーター POWER/STAND-BY 緑／オレンジ
PROTECTION 赤
TEMP 赤（ヒ−トシンク温度≧85℃）
REMOTE 緑
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
1/8出力、4Ω 950W 500W
最大出力、4Ω 4500W 2500W
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、
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）

PC9500N/PC4800N
5
PANEL LAYOUT
In case of PC9500N (J)
（PC9500N（J）の場合）
1
2
3
4
5
6
7
8
Front Panel
POWER/STAND-BY switch and indicator
REMOTE indicator
PROTECTION indicator
TEMP indicator
Level meters
Volume knobs
Air intakes
Security cover
1
2
3
4
5
6
7
8
9
XLR inputs
MODE switch
HPF 40 switches
SPEAKERS jacks
DATA ports
AMP ID switch
Euroblock connector
AC inlet (only PC4800N)
GND terminals
Rear Panel
（パネルレイアウト）
1
2
3
4
5
6
7
8
9
XLR入力端子
MODEスイッチ
HPF40スイッチ
SPEAKERS端子
DATAポート
AMPIDスイッチ
ユーロブロックコネクター
ACインレット（PC4800N）
GND端子
1
2
3
4
5
6
7
8
POWER/STAND-BYスイッチ、インジケーター
REMOTEインジケーター
PROTECTIONインジケーター
TEMPインジケーター
レベルメーター
ボリュームツマミ
吸気口
セキュリティカバー
（フロントパネル）
（リアパネル）

PC9500N/PC4800N
6
A
A'
IC401
VR401
VR402
A ATT A ATT
B ATT
B ATT
JK401
JK402
INPUT
SW801
SW101
JK801
JK802
IC401
1
3
2
5
6
7
6
72
74
91, 92
57~60
102
104
54 66 4 94, 99
10, 11
95, 96
93, 98
70, 69
6.4512M
Clock
717 5
112P
IC801
IC802
CN405-37P
CN801-37P CN405-37P
CN801-37P
CN801-37P
CN405-37P
CN602-9P
JK403
IC402-1/2 IC402-2/2
IC403-1/2 IC403-2/2
CN402-35P
CN402-35P
CN401-35P
CN401-35P
CN101-4P
Power Supply
CN602-9P
CN102-9P
*1
*1
*1
*1
*1:IN 5/5
CN701-11P
CN601-11P
LD704
IN 3/5
IN 4/5
CN407-7P
CN407-7P
CN407-7P
CN406-7P
CN406-7P
CN407-7P
CN406-7P
CN701-11P
CN106-1P
LD706
IN 5/5
PS10 2/2
PS5 2/2
CN102-9P
to PA Ach
to PA Bch
IN 1/5
SW401
-1/4
SW402-1/2
SW402-2/2
SW401
-2/4
-3/4
-4/4
CN109-1P
CN105-1P
YE
BL
BL
YE
CN108-1P
CN107-1P BR
CN110-1P BR
IC408 1/2
IC408 2/2
IC406
RY401
RY402
RY403-1/2
RY403-2/2
PS10 1/2
PS5 1/2
IN 2/5
I
N
BLOCK DIAGRAM
（ブロックダイアグラム）

PC9500N/PC4800N
7
A
A'
Q420
Q418
CN201-3P
CN104-2P
(A) (B)
CN103-2P
CN605
-1P
LD705
LD701
SP602
2
1
1
2
2 -
2 +
1 +
1 -
SP603
SP601
A ch
B ch
CN403
-3P
CN201-3P
CN404
-3P
IC201
IC201
CN202
-6P
CN202
-6P
CN603-6P
CN604-6P
RE
CN608-1P
RE
FAN DRIVE
Q115-117
CN102-9P
CN602-9P
*1
CN701-11P
CN601-11P
CN701-11P
CN601-11P
CN701-11P
CN701-11P
1-11P CN601-11P
CN601-11P
LD702
LD703
D
706
CN202-6P
CN603-6P
CN202-6P
CN604-6P
W
401
2
/4
3
/4
4
/4
CN609-2P
CN205-2P
NF
CN205-2P
NF
CN610-2P
+B -B GND
+B -B GND
PA
PA
IN 2/5
IN 2/5
IN 2/5
PS10 1/2
PS5 1/2
38CA1-8821493

PC9500N/PC4800N
8
IN 4/5
IN 3/5
PA
IN 1/5
IN 5/5
B
B'
PS
PC4800N only
B ch
WIRING
（基板結線図）

PC9500N/PC4800N
9
IN 2/5
B
B'
PA
0
0N only
A ch
38C99-8823966 2

PC9500N/PC4800N
10
DIMENSIONS
Units: mm
480
88 456
46 4380
26
25 30 370 30 25
（寸法図）
（単位）

PC9500N/PC4800N
11
DISASSEMBLY PROCEDURE
Fig.1
[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)
[40b]
PS 1/2
IN 4/5
[40a]
[40b]
[260]
[260]
[70]
[260]
[65]
[90]
[260]
I/O Rock
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)
[R310]
[220] [220]
[220]
Fig.2
[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
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)
（分解手順）
＋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

PC9500N/PC4800N
12
[R70] [R70] [R50] [R75] [R75][R60] [R10]
[R20a][R30][R20c]
[R40]
IN 1/5
IN 5/5
Fig.3
[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)
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)
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
removed. (Fig. 4)
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)
3. IN1/5CircuitBoard (Time required:about5 minutes)
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) screws marked [R70]
and four (4) screws marked [R75]. The IN 1/5 circuit
board can then be removed. (Fig. 3)
4. IN4/5CircuitBoard (Time required:about5 minutes)
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. IN5/5CircuitBoard (Time required:about3 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)
＋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

PC9500N/PC4800N
13
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）
Fig.4
[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)
Fig.5
[F30]: Bind Head Screw 4.0X30 MFZN2BL (VT229100)
[F180]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)
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。
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.
[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）
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
＋バインド小ネジ
 ＋バインドBタイト

PC9500N/PC4800N
14
[F150]
[F80]
[F150]
[F60]
Power Switch knob[F40]
IN 3/5
PS 2/2
IN 2/5
[F70] [F10]
Attenuation knob
Hexagonal nut
（六角ナット）
（PSWノブ） （アッテネーターノブ）
Fig.6
[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 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
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)
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
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)
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 cover and PA unit
can then be removed.Use the same method for 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 marked [P76]
and six (6) screws marked [P40].The PA circuit board
can then be removed. (Fig.8)
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)
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 marked [F180] and then
remove the two front covers. (Fig. 5)
9-5 Remove the six (6) screws marked [F150] and then
remove the front panel. (Fig. 6)
9-6 Remove the two (2) screws 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)
＋バインド小ネジ
＋バインドＢタイト
＋皿小ネジ

PC9500N/PC4800N
15
[P70]
PA5: not installed
[P40]
[P40]
[P40]
PA5: not installed
PA5: not installed
PA5: not installed
[P70]
[P70]
[P76]
[P76]
[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 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。
Fig.7
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.
＋バインド小ネジ
＋バインド小ネジ
＋バインド小ネジ

PC9500N/PC4800N
16
LSI PIN DESCRIPTION
PIN
NO. I/O FUNCTIONNAME PIN NO. I/O FUNCTIONNAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
TIOC4/DACK0/PE14
PE15
VSS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
VCC
A17
VSS
/RAS/PB2
/CASL/PB3
/CASH/PB4
VSS
/RDWR / PB5
A18//BACK/PB6
A19//BREQ/PB7
A20/PB8
A21/PB9
VSS
/RD
/WDTOVF
/WRH
VCC
/WRL
VSS
/CS1
/CS0
/IRQ3/TCLKD/PA9
TCLKC//IRQ2 /PA8
/CS3
/CS2
/IRQ1/PA5
TXD1
RXD1
/IRQ0/PA2
TXD0
RXD0
D15
D14
D13
VSS
D12
I/O
O
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
I
I/O
I/O
I/O
I
I/O
I/O
I/O
O
O
I
O
O
O
I
O
I
O
O
I/O
I/O
O
O
I/O
O
I
I/O
O
I
I/O
I/O
I/O
I
I/O
MTU I/O / DMA acknowledge / Port E
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
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
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
PA15 / CK
/RES
PE0/DREQ0
PE1/DRAK0
PE2
PE3
PE4
VSS
PF0 / AN0
PF1 / AN1
PF2 / AN2
PF3 / AN3
PF4 / AN4
PF5 / AN5
AVSS
PF6 / AN6
PF7 / AN7
AVCC
VSS
PE5
VCC
PE6
PE7
PE8
PE9
PE10
VSS
PE11
PE12
/MRES
I/O
I/O
I/O
I/O
I
I/O
I/O
I/O
I
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
I
I
I
I
I
I
I
O
I
I/O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
O
I
I/O
I/O
I/O
O
O
I
O
O
I
Data bus
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
HD6437042AF28 (X2263100) CPU
PC9500N IN10: IC801
PC4800N IN5: IC801
（LSI端子機能表）

PC9500N/PC4800N
17
IC BLOCK DIAGRAM
TC7W14FU ( XN883A00 )
PC9500M IN10: IC804
PC4800M IN5: IC804
INVERTER
1
2
3
4
7
6
5
81A
3Y
2A
GND
Vcc
1Y
3A
2Y
INV. INPUTN
N.I. INPUT
SYNC
OSC. OUTPUT
C
T
R
T
DISCHARGE
SOFT-START
V
REF
+V
IN
V
C
GROUND
OUTPUT A
SHUTDOWN
COMPENSATION
OUTPUT B
1INV. INPUTN
2
3
4
5
6
7
8
N.I. INPUT
SYNC
OSC. OUTPUT
C
T
R
T
DISCHARGE
SOFT-START
11
12
13
14
15
16 V
REF
+V
IN
OUTPUT B
V
C
GROUND
OUTPUT A
SHUTDOWN
COMPENSATION
9
10
NJM4558M(T1) (IG103520)
PC9500M IN10: IC601, IC602, IC603,
IC604, IC605, IC606
PC4800M IN5: IC601, IC602, IC603,
IC604, IC605, IC606
●
SG3525AN (X2383A00)
PC9500M PS10: IC101
PC4800M PS5: IC101
REGULATOR
●
M5238AFP (XL669A00)
PC9500M IN10: IC401
PC4800M IN5: IC401
OP AMP
●
NJM2068MD-T1 (XJ553A00)
PC9500M IN10: IC402, IC403, IC404,
IC405, IC406, IC407
PC4800M IN5: IC402, IC403, IC404,
IC405, IC406, IC407
●
1
2
3
4
8
7
6
5
Output A
Non-Inverting
Input A
Ground
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+-
+-
DS36276M (X2155A00)
PC9500M IN10: IC802
PC4800M IN5: IC802
TRANSCEIVER
●
DSCILLATDR
16 15
413
11
14
12
8
10
3
6
7
5
1
2
FLIP/
FLOP
REFERENCE
REGULATOR
E/A
B
A
5K 5K
50µA
PWM
9
1
2
3
4
R8
7
6
5
RO
DE
DI
V
CC
DO/RI
DO/RI
GND
RE
D
1V SS
2
3
4
5
6
7
8
OUT
IN
NC
L-ch
A-GND
CS1
GND
CK
11
12
13
14
15
16 V
DD
OUT
IN
NC
A-GND
CS2
STB
DATA
9
10
TC9413AP (X2101A00)
PC9500M IN10: IC408
PC4800M IN5: IC408
VOLUME
●
R-ch
2
1 16
3
4
5
6
7
8
15
14
13
12
11
10
9
OUT OUT
IN
NC
A-GND
CS2
STB
DATA
V
SS V DD
IN
L-ch NC
A-GND
CS1
GND
CK
R-ch
L-ch
Data latch
circuit
R-ch
Data latch
circuit
Shift register (13bit)
Level
shift
circuit
Level
shift
circuit
Strobe generation circuit
（IC ブロック図）

PC9500N/PC4800N
18
1LC
2
3
4
5
6
7
COM
VCC
VS
VB
HC
9
10
11
12
13
14
VSS
LIN
SD
HIN
VDD
8
IR2110 (X2382A00)
PC9500M PS10: IC103,IC104
PC4800M PS5: IC103,IC104
DRIVER
●
VDD/VCC
LEVEL
SHIFT PULSE
GEN
PULSE
GEN
VDD
VSS
HIN
SD
LIN
10
9
11
14
15
RSQ
RSQ
VDD/VCC
LEVEL
SHIFT
HV
LEVEL
SHIFT
UV
DETECT
UV
DETECT
DELAY
PULSE
FILTER
R
R
S
Q
6
7
5
3
1
2COM
LO
VCC
VS
VB
HO
LB1409M (X0654A00)
PC9500M IN10: IC701, IC702
PC4800M IN5: IC701, IC702
LED DRIVE
●
1VCC
2
3
4
5
6
7
Vref1
VIN+
VIN–
OUT
GND
D1
11
12
13
14
15
16
D9
Vref2
D8
D7
D6
D5
10
8D2
D4
D3
9
3
2 1
4
R10
10K R20 5
4.69K
R9 3.31K
R8
R7(2.34K), R6(1.66K), R5(1.17K)
R4(830), R3(586), R2(414)
1K
R1
13, 12, 11, 10, 9, 8
COM
VIN+
VIN–
5 6
GND
OUT
Vref 1 Vref 2VCC
16 15
–
+COM
–
+COM
–
+
14 7
D9
98 1
D8 D1

19
PC9500N/PC4800N
CIRCUIT BOARDS
（シート基板図）
Note: See parts list for details of circuit board component parts.
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
CONTENTS
（目次）
注：シートの部品詳細はパーツリストをご参照下さい。

PC9500N/PC4800N
20
B
B'
from PS-W102
-- +
SPEAKERS
OUTPUT
A2 B2 GND
+
from PS-W103
from PA ACH-CN205
from PA ACH-W204 from PA ACH-CN205
from PA BCH-W204
CN602:
f
CN604: t
o
CN601: to IN 2/5-CN701
CN603: to PA ACH-CN202
A
A'
IN 1/5 Circuit Board (PC9500N: IN10, PC4800N: IN5)
IN: 3NA-V848170