Yamaha P-70 User manual

SERVICE MANUAL
PK 001747
Copyright (c) Yamaha Corporation. All rights reserved. PDF KM ’06.01
P-70: 20051201- オープンプライス
P-70S: 20051201- オープンプライス
■ CONTENTS（目次）
SPECIFICATION（総合仕様）........................................................... 3
PANEL LAYOUT（パネルレイアウト）.............................................. 4
CIRCUIT BOARD LAYOUT & WIRING
（ユニットレイアウト＆束線図）................... 5
BLOCK DIAGRAM（ブロックダイアグラム）.................................. 6
DISASSEMBLY PROCEDURE（分解手順）................................... 7
LSI PIN DESCRIPTION（LSI端子機能表）................................... 18
IC BLOCK DIAGRAM（ICブロック図）......................................... 20
CIRCUIT BOARDS（シート基板図）.............................................. 21
TEST PROGRAM（テストプログラム）................................... 27/30
MIDI IMPLEMENTATION CHART
（MIDIインプリメンテーションチャート）........ 33/34
OVERALL CIRCUIT DIAGRAM（総回路図）
PARTS LIST
P-70/P-70S
ELECTRONIC PIANO
● OPTION（別売品）
 L-70 KEYBOARD STAND
（L-70スタンド）
 L-70S KEYBOARD STAND
（L-70S スタンド）
P-70
P-70S

P-70/P-70S
2
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 personal 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: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
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
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 part 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-
SOEVER!
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 (安全上の注意)
Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed.
印の部品は、安全を維持するために重要な部品です。交換をする場合は、安全のため必ず指定の部品をご使用下さい。

3
P-70/P-70S
■ SPECIFICATIONS（総合仕様）
Keyboard 88 keys (A-1—C7)
Sound Source AWM Stereo Sampling
Polyphony (Max.) 32
Voice Selection 10
Effect Reverb
Volume Master Volume
Controls Dual, Transpose, Touch (Hard/Medium/Soft/Fixed)
Pedal SUSTAIN PEDAL*
Demo Songs 10 voice Demo Songs, 50 preset Songs
Jacks/Connectors MIDI (IN/OUT), PHONES ×2, DC IN 12V, PEDAL
Main Ampli ers 6 W ×2
Speakers (12 cm ×6 cm) ×2
Dimensions (W ×D ×H) 1,330 mm ×355 mm ×133 mm [52-3/8" ×14" ×5-1/4"]
(1,330 mm ×402 mm ×319 mm) [52-3/8" ×15-13/16" ×12-9/16"]
Weight 13 kg (28 lbs. 11 oz.)
Accessories Owner’s Manual, Yamaha PA-5D power adaptor, Pedal (FC5), Music Rest
鍵盤 88鍵(A-1〜C7)
音源
AWMステレオサンプリング
最大同時発音数 32
音色数 10
効果 リバーブ
ボリューム マスターボリューム
コントロール デュアル、トランスポーズ、タッチ(ハード、ミディアム、ソフト、フィックスト)
ペダル サステイン(ハーフペダル対応) *
デモ 各音色デモ曲、ピアノ曲50曲(プリセットソング)
付属端子 MIDI端子(IN/OUT)、PHONES(ミニ)×2、PEDAL端子、DC IN＋12V端子
メインアンプ 6W×2
スピーカー 楕円(12cm×6cm)×2
定格電源 電源アダプター PA-5D
消費電力 25W
寸法[間口×奥行き×高さ]
( )内は譜面立てを立てた場合 1330mm×355mm×133mm
(1330mm×402mm×319mm)
質量 13kg
付属品 保証書、取扱説明書(本書)、ピアノで弾く名曲50選(楽譜集)、
クイックオペレーションガイド、電源アダプター PA-5D、
フットスイッチFC5、譜面立て

P-70/P-70S
4
■ PANEL LAYOUT（パネルレイアウト）
q w e r tuy
o
i
q[STANDBY/ON] switch
w[MASTER VOLUME] slider
e[DEMO/SONG] button
r[GRAND PIANO/VOICE] button
t[SELECT] button
y[DC IN 12V] jack.
uMIDI [IN] [OUT] terminals
i[PEDAL] jack
o[PHONES] jack
PHONES
q[STANDBY/ON]スイッチ
スタンバイ /オン
w[MASTER VOLUME]スライダー 
マスターボリューム
e[DEMO/SONG]ボタン
デモ/ ソング
r[GRAND PIANO/VOICE]ボタン
グランドピアノ / ボイス
t
[ SELECT ]ボタン 
セレクト
y[DC IN12V]端子
ディーシーイン12 ボルト
uMIDI[IN][OUT]端子
ミディ イン アウト
i[PEDAL]端子
ペダル
o[PHONES]端子
フォーンズ

5
P-70/P-70S
■ CIRCUIT BOARD LAYOUT & WIRING（ユニットレイアウト＆束線図）
Upper Case (Inside view)
CN301
CN101 CN102
CN104
CN2CN3 CN1
CN1 CN1
CN201
CN202
CN301
CN401
CN105
CN101
CN103
CN201
DM
DJACK
HP
PN
AM
GHL-H GHL-M GHL-L
u
e
t
r
y
r
yy
w
t
e
q
q
w
e
r
t
y
u
DJACK-CN201
AM-CN103
PN-CN102
PN-CN101
HP-CN301
DM-CN202
DM-CN401
DM-CN201
AM-CN101
AM-CN105
Speaker L
Speaker R
D M-CN301
6 Pin
15 Pin
4 Pin
11 Pin
6 Pin
27 Pin
DJACK
AM
PN
VR
PN3
DESTINATION REMARKS
CONNECTOR
ASSEMBLY
(WG27850)
(WF20690)
WF207000
(WF20710)
(WF20720)
WG123900
6 Pin (WF20730)
WH201
WH103
M101
M102
WH004
AM-CN104SPM104
GHL-M-CN2FFC-
Note: "( )" are not available as spare parts.
注:"()"の部品は、サービス用部品として準備されていません。
REF. No. No.
Speaker（スピーカ）
Keyboard
Assembly
（鍵盤Ass'y）
Speaker（スピーカ）
DMDJACK
PN
HP
AM
Speaker（スピーカ） Speaker（スピーカ）

P-70/P-70S 6
■ BLOCK DIAGRAM（ブロックダイアグラム）
RESET
DC IN 12V
PA-5D
+2.5D
SPEAKERS
4
12 x 6cm
+3.3D
+5D
+5A
+5A
LA4625
R
+3.3D
+2.5D
Keyboard
88KEY GH-L
B1-B15
+3.6V
16.934MHz
CRYSTAL
RESONATOR POWER AMP
6W X 2
N11-N16
N21-N26
ADC
8bit
+3.3D
/PSWI
SDI
BCLK,WCLK
MIDI
IN
MIDI
OUT
I/F
STANDBY/
ON SW
L
ADCS7478
+5D
MASTER
VOLUME
A10KΩ
HPAMP
+5A
DAC
24bit LPF
OP AMP
SYSCK
BCLK
WCLK L CH
R CH
+5A
SDO
HPSW
SW x3
MIDITX
MIDIRX
SPOFF
PSWCNT
/PSWI
+5D
P.L
HPSW
R
L
Headphone 1 Headphone 2
16
CPU
AND
IC302, 303
IC103
UPD789022GB
IC301
5MHz
CN301
CN2
CN202
CN201
CN201
CN102
CN101
CN101
CN103
CN401
CN105
CN104
CN301
3.3V→5V
MKS_ACK
MKS_RX
MKS_CLK
/MKC_IC
+5D
EQ
OP AMP
+5A
Fc=27KHz
/MUTE
/MUTE
LA4536M
PSWCNT
28CA1-2000004792
+5D
SW[0-2]
SUSTAIN
PEDAL
AK4385ET
MK
DM
PN
HP
AM
DJACK
SWL01(T)
YMW767-VT
CPU
IC101
PROG/WAVE
64M
IC102
ROM
+3.3V
IC403
REGULATOR +5V
IC401
IC105
IC301
IC101-104
REGULATOR
+5V
IC402
REGULATOR
+2.5V
IC404
IC402IC401
IC201
IC301
REGULATOR

7
P-70/P-70S
■ DISASSEMBLY PROCEDURE（分解手順）
Lower Case (Bottom view)
Upper Case (Inside view)
1. Lower Case Assembly
(Time Required: about 12 min)
1-1 Remove the seventy two (72) screws marked [S03].
The
lower case assembly can then be removed.
(Photo 1)
1. 下ケースAss'y（所要時間:約12分）
1-1. [S03]のネジ72本を外して、下ケースAss'yを

 外します。（Photo1）
2. DM Circuit Board
(Time Required: about 12 min)
2-1
Remove the lower case assembly. (See procedure 1.)
2-2 Remove the four (4) screws marked [S01a] . The DM
circuit board can then be removed. (Photo 2, 3)
2. DMシート（所要時間:約12分）
2-1. 下ケースAss'yを外します。（1項参照）

2-2. [S01a]のネジ4本を外して、DMシートを外し

 ます。(Photo2,3)
[S03]: Bind Head Tapping Screw-B 4.0x16 MFZN2W3 (WF154100) Bタイト＋BIND
(Photo 1)
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
(Photo 3)
(Photo 2)
[S03]LowerCaseAssembly
（下ケースAss'y）
Speaker（スピーカ）
Keyboard
Assembly
（鍵盤Ass'y）
Speaker（スピーカ）
[S03]
[S03]
[S03]
[S03]
[S03][S03]
DM
DMDJACK
PN
[S01a][S01a]
HP
AM

P-70/P-70S
8
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
(Photo 4)
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
(Photo 5)
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
(Photo 6)
3. AM Circuit Board (Time Required: about 13 min)
3-1 Remove the lower case assembly. (See procedure 1.)
3-2 Remove the ten (10) screws marked [S01b] . The AM
circuit board can then be removed. (Photo 2, 4)
3. AMシート（所要時間:約13分）
3-1. 下ケースAss'yを外します。（1項参照）
3-2. [S01b]のネジ10本を外して、AMシートを外
し
 ます。(Photo2,4)
4.
DJACK Circuit Board (Time Required: about 13 min)
4-1 Remove the lower case assembly. (See procedure 1.)
4-2 Remove the four (4) screws marked [S01c] . The
DJACK circuit board can then be removed. (Photo 2, 5)
4. DJACKシート（所要時間:約13分）
4-1. 下ケースAss'yを外します。（1項参照）
4-2. [S01c]のネジ4本を外して、DJACKシートを
 外します。(Photo2,5)
5.
HP Circuit Board (Time Required: about 13 min)
5-1 Remove the lower case assembly. (See procedure 1.)
5-2 Remove the two (2) screws marked [S01d] . The HP
circuit board can then be removed. (Photo 2, 6)
5. HPシート（所要時間:約13分）
5-1. 下ケースAss'yを外します。（1項参照）
5-2. [S01d]のネジ2本を外して、HPシートを外し

 ます。(Photo2,6)
UpperCaseAssembly
（上ケースAss'y）
UpperCaseAssembly
（上ケースAss'y）
UpperCaseAssembly
（上ケースAss'y）
[S01c][S01c]
AM
[S01b]
[S01b]
AM
DJACK
[S01d]

9
P-70/P-70S
[U40]: Bind Head Tapping Screw-B 4.0x8 MFZN2B3
(WE962000) Bタイト＋BIND
[U60]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3
(WE774300) Bタイト＋BIND
(Photo 7) (Photo 8)
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
[S02]: Bind Head Tapping Screw-B 3.0x25 MFZN2W3 (WE473400) Bタイト＋BIND
(Photo 9)
7. Keyboard Assembly (Time Required: about 14 min)
7-1 Remove the lower case assembly. (See procedure 1.)
7-2 Remove the DM circuit board. (See procedure 2.)
7-3 Remove the two (2) screws marked [S01e]. The
cord binder can then be removed. (Photo 9)
7-4
Remove the four (4) screws marked [S01f]. The DM
protect sheet can then be removed. (Photo 9)
7-5
Remove the six (6) screws marked [S01g] and the
eight (8) screws marked [S02]. The keyboard assembly
can then be removed. (Photo 9)
7. 鍵盤Ass'y（所要時間:約14分）
7-1. 下ケースAss'yを外します。（1項参照）
7-2. DMシートを外します。（2項参照）
7-3.
[S01e]のネジ2本を外して、 GHLMK束線止め

 を外します。(Photo9)
7-4.
[S01f]のネジ4本を外して、DM プロテクトシ

 ートを外します。(Photo9)
7-5.
[S01g]のネジ6本と[S02]のネジ8本を外して、

 鍵盤Ass'yを外します。(Photo9)
6.
Speaker (Time Required: about 14 min)
6-1 Remove the lower case assembly. (See procedure 1.)
6-2 Remove the two (2) screws marked [U60]. The speaker
grille assembly c an then be removed . (Photo 2, 7)
6-3 Remove the four (4) screws marked [U40] . The speaker
c an then be removed. (Photo 8)
6. スピーカ（所要時間:約14分）
6-1. 下ケースAss'yを外します。（1項参照）
6-2. [U60]のネジ2本を外して、SPグリルAss'yを外

 します。（Photo 2, 7）
6-3. [U40]のネジ4本を外して、スピーカを外し
 ます。(Photo8)

Speaker（スピーカ）Speakergrille（スピーカグリル）
[S01g] [S01g]
[S02] [S02]
Upper Case
(Inside view)
[U40]
[U60]
Speaker（スピーカ）
[S01e]
[S01f]
[S01f]
Cordbinder（GHLMK束線止め）
DMprotectsheet
（DMプロテクトシート）

P-70/P-70S
10
[S01]: Bind Head Tapping Screw-B 3.0x8 MFZN2W3 (WE774300) Bタイト＋BIND
(Photo 10)
8. PN Circuit Board (Time Required: about 15 min)
8-1 Remove the top cover. (See procedure 1.)
8-2 Remove the six (6) screws marked [S01h]. The PN
circuit board can then be removed. (Photo 2, 10)
8. PNシート（所要時間:約15分 ） 
8-1. 下ケースAss'yを外します。（1項参照） 
8-2. [S01h]のネジ6本を外して、PNシートを外し

 ます。(Photo2,10)

UpperCaseAssembly
（上ケースAss'y）
PN
[S01h]
[S01h]

11
P-70/P-70S
Keyboard Assembly (Top view)
[270B]
A-1 Key
（A-1鍵）
B-1 Key
（B-1鍵）
One octave
（1オクターブ）
(C0—B0)
[270A] [270A] [270A] [270A] [270A] [270A] [270A] [270C]
C7 Key
（C7鍵）

One octave
（1オクターブ）
(C1—B1)
One octave
（1オクターブ）
(C2—B2)
One octave
（1オクターブ）
(C3—B3)
One octave
（1オクターブ）
(C4—B4)
One octave
（1オクターブ）
(C5—B5)
One octave
（1オクターブ）
(C6—B6)
Grease
（グリス）
Rubber contact
（接点ゴム）
GHL88M
End lug of white key
（白鍵の爪）
Actuate rubber
（駆動ラバー）
Remove in this way.
（取り出す）
9. Disassembling the Keyboard Assembly
9-1 White key assembly and black key assembly
Remove the four (4) screws marked [270A] fixing the
black and white key assembly for one octave (C—B).
To remove the back of the black and white key
assembly of each octave, while pushing the end lug
of white keys rearward and lifting the back of keys,
slide the black and white key assembly towards you.
(Fig. 1, Fig. 2)
9-2
When removing white keys numbered as A-1 and B-1
key and black key, remove two (2) screws marked
[270B] and then lift the back of the keys and slide
the black and white keys towards you. (Fig. 1)
9-3
When removing the C7 key, remove a screw marked
[270C] and then lift the back of C7 key and slide it
towards you. (Fig. 1)
Note: When removing white key assembly and black key
assembly, be careful not to allow grease to attach to
the circuit board and rubber contacts, etc. (Fig. 2)
9-4 Actuate Rubber
Remove the actuate rubber. (Fig. 3)
9. GHL(GHS)鍵盤Ass'yの分解
9-1 白鍵Ass'y、黒鍵Ass'y
 各オクターブ（C〜B）の白鍵Ass'yと黒鍵Ass'yを止
 めている[270A]のネジ4本を外し、白鍵のツメを後

 方に押しながら1オクターブ分の白鍵Ass'y／黒鍵
 Ass'yを外します。このとき、白鍵Ass'y／黒鍵
 Ass'yの後部を持ち上げてから、手前にスライドさ

 せて取り外してください。(図1、図2)
9-2 A-1,B-1鍵は、[270B]のネジ2本を外し、A-1,B-1鍵
 の後方を持ち上げてから、手前にスライドさせて
 取り外します。(図1)
9-3 C7鍵は、[270C]のネジ1本を外し、C7鍵の後方を
 持ち上げてから、手前にスライドさせて取り外し
 ます。(図1)
注） 白鍵Ass'y、黒鍵Ass'yの取り外しの際、グリスが基

 板や接点ゴム等に付かないように注意してくださ
 い。(図2)

9-4 駆動ラバー
白鍵（黒鍵）の駆動ラバーを外します。（図3）
[270]: Bind Head Tapping Screw-P 3.0x16 MFZN2W3 (WF973000) Pタイト＋BIND
(Fig. 1)
(Fig. 2) (Fig. 3)

P-70/P-70S
12
Keyboard Assembly (Top view)
[260A]
Rubber contact
（接点ゴム）
[260B] [260C]
Rubber contact
（接点ゴム）
Rubber contact
（接点ゴム） Rubber contact
（接点ゴム）
Rubber contact
（接点ゴム） Rubber contact （接点ゴム）
Rubber contact
（接点ゴム） Rubber contact
（接点ゴム）
GHL88H
GHL88MGHL88L
One octave
（1オクターブ）
(C—B)
One octave
（1オクターブ）
(C—B)
One octave
（1オクターブ）
(C#—C)
Rubber contact
（接点ゴム） Key （鍵盤）
To remove the rubber contact for one octave, keys for 2 octaves need to be removed.
1オクターブ分の接点ゴムを外すのに、2オクターブ分の鍵盤を外します。
9-5 Rubber Contact
Remove the black and white key assembly for two
octaves related to the subject rubber contact. The rubber
contact can then be removed. (Fig. 4, Fig. 4-1)
*
Note that the rubber contact has a specific installation
direction.
* One rubber contact fits for C#—C (for C—B keys).
9-5 接点ゴム
 該当する接点ゴムの2オクターブ分の白鍵Ass'y／

 黒鍵Ass'yを外して、接点ゴムを外します。
 (図4、図4-1)
※ 接点ゴムには、向きがあります。
※ 接点ゴムは、C#〜Cの一連です。（キーはC〜B）

[260]: Bind Head Tapping Screw-P 2.6x8 MFZN2W3 (WF267300) Pタイト＋BIND
(Fig. 4)
(Fig. 4-1)

13
P-70/P-70S
Keyboard Assembly (Top view) Keyboard Assembly (Side view)
GHL88M
FFC cable
（FFCケーブル）
Frame
（フレーム）
FFC cable
（FFCケーブル）
Filament tape
（フィラメントテープ）
Keyboardassembly
（GHL(GHS)鍵盤Ass'y）
CN2 (27P)
GHL88M
CN2
(27P)
Through hole
（通し穴）
Filament tape
（フィラメントテープ）

9-6 GHL88L Circuit Board
Remove the black and white key assembly (A1—B2).
(See procedure 4-1)
Remove the six (6) screws marked [260A]. The
GHL88L circuit board can then be removed. (Fig. 4)
9-7 GHL88M Circuit Board
Remove the black and white key assembly (C1—B5).
(See procedure 4-1)
Remove the seven (7) screws marked [260B]. The
GHL88M circuit board can then be removed. (Fig. 4)
Detach the filament tape and disconnect the FFC cable.
(Fig. 5)
9-8 GHL88H Circuit Board
Remove the black and white key assembly (C5—C7).
(See procedure 4-1)
Remove the five (5) screws marked [260C]. The
GHL88H circuit board can then be removed. (Fig. 4)
9-6 GHL88Lシート
 A-1〜B2までの白鍵Ass'y／黒鍵Ass'yを外します。

 (4-1項参照)
 [260A]のネジ6本を外して、GHL88Lシートを外し

 ます。(図4)

9-7 GHL88Mシート
 C1〜B5までの白鍵Ass'y／黒鍵Ass'yを外します。

 (4-1項参照)
 [260B]のネジ7本を外して、GHL88Mシートを外
し
 ます。(図4)
 フィラメントテープをはがして、FFCケーブルを

 抜き取ります。(図5)

9-8 GHL88Hシート
 C5〜C7までの白鍵Ass'y／黒鍵Ass'yを外します。

 (4-1項参照)
 [260C]のネジ5本を外して、GHL88Hシートを外し

 ます。(図4)

(Fig. 5)

P-70/P-70S
14
Keyboard Assembly (Rear view)
Frame
（鍵盤フレーム）
Hammer, white key
（ハンマー（白鍵））
Hammer, black key
（ハンマー（黒鍵））
Bearing claw
（軸受け爪）
Hammer axis
（ハンマー軸）
Bottom side（ボトム側）
Push（押す）
Hammer, W1 (white key)
（ハンマーW1（白鍵））
Hammer, B1 (black key)
（ハンマーB1（黒鍵））
Bearing claw
（軸受け爪）
Bearing section
（軸受け部）
9-9 Hammer (White Key), (Black Key)
Remove the black and white key assembly for the
related keys.
With the key frame placed upside down, push the
hammer forward from the rear, then a click sound is
heard and the hammer bearing section can be removed
from the hammer axis of the key frame. Take out the
hammer sideways. (Fig. 6, Fig. 7)
* When removing the hammer, use care not to cause
damage to the hammer bearing and its claw.
9-9 ハンマー（白鍵）、（黒鍵）
 該当する白鍵Assy／黒鍵Assyを外します。
 鍵盤フレームを裏側にして、後方からハンマーを

 前に押すと、「カチッ」と音がして鍵盤フレームの

 ハンマー軸からハンマーの軸受け部が外れます。

 ハンマーを横にして取り出します。（図6、図7）
※
ハンマーを外すとき、ハンマーの軸受け爪や軸受
け
 部を傷めないように注意して作業してください。


(Fig. 6)
(Fig. 7)

15
P-70/P-70S
Keyboard Assembly (Rear view)
Frame
（鍵盤フレーム）
Hammer, white key
（ハンマー（白鍵））
Hammer, black key
（ハンマー（黒鍵））
Hammer axis
（ハンマー軸）
Bottom side（ボトム側）
Pull forward（手前に引く）
Bearing section（軸受け部）
Apply grease
（グリス塗布）
10. Assembling the Keyboard Assembly
10-1 Hammer (White Key), (Black Key)
After applying grease to the bearing section of the
hammer, bring the hammer (white key) (black key)
sideways from the rear, fit its bearing section to the
hammer axis of the key frame and pull it forward until
a click sound is heard. (Fig. 8)
*
There are 8 hammer types differing in weight. Be sure
to check the type of the hammer for correct installation.
(See the table below)
10. GHL(GHS)鍵盤Ass'yの組立
10-1 ハンマー（白鍵）、（黒鍵）

ハンマー軸部にグリス塗布後、後方からハンマー（白

 鍵）、（黒鍵）を横にして入れて、ハンマーの軸受け部

 を鍵盤フレームのハンマー軸にはめ込み、「カチッ」

 と音がするまでハンマーを手前に引いて取り付け

 ます。（図8）
※ 重りの違いにより8種類のハンマーがあります。種

 類に注意して取り付けてください。（下表参照）

10-2 GHL88L Circuit Board
Tighten the six (6) screws marked [260A] to fix the
GHL88L circuit boards. (Fig. 4)
10-3 GHL88M Circuit Board
Connect the FFC cable to CN2 of the GHL88M circuit
board, attach the filament tape. (Fig. 5)
Pass the end of the cable into the through hole in the
frame and pull it out from its outlet. (Fig. 5)
Tighten the seven (7) screws marked [260B] to fix the
GHL88M circuit board. (Fig. 4)
10-2 GHL88Lシート
GHL88Lシートを取り付け、[260A]のネジ6本で固定し
ます。(図4)

10-3 GHL88Mシート
F
FCケーブルをGHL88MシートのCN2に差し込み、

 フィラメントテープを貼り付けます。(図5)

ケーブルの先をフレームの通し穴に通して、抜き口

 から引き出します。(図5)

GHL88Mシートを取り付け、[260B]のネジ7本で固定

 します。(図4)
(Fig. 8)

P-70/P-70S
16
Rubber contact
（接点ゴム） Rubber contact
（接点ゴム）
GHL88L
Triangle mark
（三角マーク） Triangle mark
（三角マーク）
Front
（フロント）
Rubber contact
（接点ゴム） Clip
（クリップ）GHL88L
Actuate rubber
（駆動ラバー）
Fit in this way.
（はめ込む）
Apply grease
（グリス塗布）
10-4 GHL88H Circuit Board
Tighten the five (5) screws marked [260C] to fix the
GHL88H circuit board. (Fig. 4)
10-5 Rubber Contact
Note that the rubber contact has s specific installation
direction. Be careful not to install it in the wrong
direction.
*
A triangle mark ( ) on the rubber contact must face
the front. (Fig. 9)
To prevent looseness of the rubber contact, fit it
securely in place using a clip or similar object.
(Fig. 10)
10-4 GHL88Hシート
 GHL88Hシートを取り付け、[260C]のネジ5本で固

 定します。(図4)

10-5 接点ゴム

接点ゴムには、取り付けの向きが決まっています。

 接点ゴムを逆に取り付けないように注意してくだ

 さい。
※ 接点ゴムの三角マーク（ ）がフロント側になるこ

 とを確認します。(図9)

 接点ゴムの浮きがないように、クリップ等で接点

 ゴムを基板にはめ込みます。(図10)
10-6 Actuate Rubber
After applying grease to top and bottom faces of the
actuate rubber, fit it to the white key (black key).
(Fig. 11)
10-6 駆動ラバー
 駆動ラバーの上下にグリスを塗布後、白鍵（黒鍵）

 に駆動ラバーをはめ込みます。(図11)
(Fig. 11)
(Fig. 9) (Fig. 10)

17
P-70/P-70S
Contact arm（接点アーム）
Hammer
（ハンマー）
Actuate rubber
（駆動ラバー） Slit
（スリット）
Key guide
（キーガイド）
Actuate rubber
（駆動ラバー） Slit
（スリット）
Contact arm（接点アーム）
<Side view>
Apply grease
（グリス塗布）
Key guide
（キーガイド）
10-7 White key assembly and black key assembly
After applying grease to the key guide, install the white
key assembly/black key assembly. At this time, check
to make sure that the key guide of the key frame and
inside slit at the front of white key as well as the contact
arm of the hammer and actuate rubber of the white key
assembly/black key assembly are installed properly.
(Fig. 12)
Use the four (4) screws marked [270A] to fix 1 octave
white key assembly/black key assembly. (Fig. 1)
10-8 Use the two (2) screws marked [270B] to fix the A-1
to B-1 keys. (Fig. 1)
10-9 Use a screw marked [270C] to fix the C7 key.
(Fig. 1)
10-7 白鍵Ass'y、黒鍵Ass'y
 キーガイドにグリス塗布後、白鍵Ass'y／黒鍵Ass
'y
 を取り付けます。

このとき、鍵盤フレームのキーガイドと白鍵前部の

 内側スリット、ハンマーの接点アームと白鍵Ass'y／

 黒鍵Ass'yの駆動ラバーがはめ込まれていることを

 確認してください。(図12)
 1オクターブの白鍵Ass'y／黒鍵Ass'yは、[270A]の

 ネジ4本で固定します。(図1)
10-8 A-1〜B-1鍵は、[270B]のネジ2本で固定します。
 (図1)
10-9 C7鍵は、[270C]のネジ1本で固定します。(図1)

(Fig. 12)

P-70/P-70S
18
■ LSI PIN DESCRIPTION（LSI端子機能表）
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
57
58
59
60
61
62
63
64
Vss
TESTN
PLLBPN
PLLVDD
CIN
PLLVss
TRSTN
TMS
TCK
TDI
TDO
XI
XO
Vss
VDD
ICN
ECSN
EWRN/PD5
ERDN/PD4
EA3/PD3
EA2/PD2
EA1/PD1
EA0/PD0
IOVDD
ED0/PC0
ED1/PC1
ED2/PC2
ED3/PC3
ED4/PC4
ED5/PC5
ED6/PC6
ED7/PC7
Vss
IRQ0N/PH0
TxD0
RxD0
TxD1/PG2
RxD1/PH1
SCLK1/PH2
SDO
SDI/PH3
BCLK
WCLK/SYO
SYSCLK/PG3
Vss
VDD
IOVDD
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
Vss
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7/SYI
-
I
I
-
-
-
I
I
I
I
O
I
O
-
-
I
I
I
I
I
I
I
I
-
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
I
O
I
O
I
I
O
I
O
O
O
-
-
-
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Ground
Input for TEST
PLL bypass select
PLL Power supply +2.5 V
Capacitor terminal for PLL
PLL Ground
JTAG input
JTAG output
Crystal oscillator
Crystal oscillator
Ground
Power supply +2.5 V
Hardware reset
CPU I/F chip select
CPU I/F write enable / Port D
CPU I/F read enable / Port D
CPU I/F address bus / Port D
Power supply +3.3 V
CPU I/F data bus / Port C
Ground
Interrupt input / Port H
Serial output
Serial input
Serial output / Port G
Serial input / Port H
External synchronization clock / Port H
Serial output
Serial input / Port H
Bit clock output
Word clock output
Clock output / Port G
Ground
Power supply +2.5 V
Power supply +3.3 V
I/O port A
Ground
I/O port B
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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
Vss
IOVDD
LBN/LWRN/PF6
UBN/UWRN/PF7
RDN/PF4
MD00
MD08
MD01
MD09
MD02
MD10
MD03
Vss
MD11
MD04
MD12
MD05
MD13
MD06
MD14
MD07
MD15
WRN/PF5
Vss
VDD
IOVDD
MA17
MA16
MA15
MA14
MA13
MA12
MA11
MA10
MA09
MA08
MA07
MA06
MA05
Vss
MA04
MA03
MA02
MA01
CS0N/PG0
MA18
MA19
MA21/PF1
MA22/PF2
MA20
MA23/PF3
CSIN/PG1
MA00/PF0
Vss
VDD
IOVDD
CS2N/PE0
CS3N/PE1
CS4N/CASN/PE2
CS5N/PE3
CS50RDN/PE4
CS51WRN/PE5
CS52WRN/PE6
CS53WRN/RASN/PE7
-
-
O
O
O
I/O
I/O
I/O
I/O
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
-
-
-
O
O
O
O
O
O
O
O
O
O
O
O
O
-
O
O
O
O
O
O
O
O
O
O
O
O
O
-
-
-
O
O
O
O
O
O
O
O
Ground
Power supply +3.3 V
External memory lower-byte enable / Port F
External memory upper-byte enable / Port F
External memory read enable / Port F
External memory data bus
Ground
External memory data bus
Ground
Power supply +2.5 V
Power supply +3.3 V
External memory address bus
Ground
External memory address bus
External memory chip select / Port G
External memory address bus
External memory address bus / Port F
External memory address bus
External memory address bus / Port F
External memory chip select / Port G
External memory address bus / Port F
Ground
Power supply +2.5 V
Power supply +3.3 V
External memory chip select / Port E
YMW767-VTZ (X6055A00) CPU (SWL01B)

19
P-70/P-70S
AK4385ET (X6040A00) DAC (Digital to Analog Converter)
PIN
NO. NAME I/O FUNCTION PIN
NO. NAME I/O FUNCTION
I Master Clock Rch Analog out(-)
I Audio Serial Data Clock Rch Analog out(+)
I Audio Serial Date Input Lch Analog out(-)
I L/R Clock Lch Analog out(+)
I Power Down mode Ground
I Chip Select Power Supply
I Control Data Input Rch Data Zero Input Detect
I Control Data Input Lch Data Zero Input Detect
1
2
3
4
5
6
7
8
MCLK
BICK
SDTI
LRCK
PDN
CSN
CCLK
CDTI
9
10
11
12
13
14
15
16
AOUTR-
AOUTR+
AOUTL-
AOUTL+
Vss
VDD
DZFR
DZFL
O
O
O
O
-
-
O
O
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
P12
P11
P10
P47/KR7
P46/KR6
P45/KR5
P44/KR4
P43/KR3
P42/KR2
P41/KR1
P40/KR0
NC
IC
X2
X1
VSS0
VDD0
/RESET
P53
P52
P51/TO2
P50/TI0/TO0
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I/O
I/O
I/O
I/O
Port 1
Port 4/Key return signal detection input
Internally connected (N.C.)
Clock
Ground
Power supply
System reset
Port 5
Port 5/16-bit timer output
Port 5/External count clock input to 8-bit timer/8-bit timer output
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
P32/INTP2/CPT2
P31/INTP1
P30/INTP0
P22/RXD/SI0
P21/TXD/SO0
P20/ASCK//SCK0
P07
P06
P05
P04
P03
P02
P01
P00
NC
VDD1
VSS1
P17
P16
P15
P14
P13
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Port 3/External interrupt input/Capture edge input
Port 3/External interrupt input
Port 2/Asynchronous serial interface serial data input/Serial interface serial data input
Port 2/Asynchronous serial interface serial data output/Serial interface serial data output
Port 2/Asynchronous serial interface serial clock input/Serial interface serial clock
Port 0
Power supply
Ground
Port 1
PD789022GB-A15-8E (XZ560100) CPU

P-70/P-70S
20
■ IC BLOCK DIAGRAM（IC ブロック図）
M4580L (XF195A00)
Dual Operational Amplifier
AM: IC101-104
NJM4580E (TE2) (X2331A00)
Dual Operatinal Amplifier
DM: IC402
SN74AHCT1G08DCKR (X0158A00)
Single 2-Input Positive-AND Gate
DM: IC302, 303
LA4536M (X6813A00)
Headphone-stereo Power Amplifier
AM: IC301
ADCS7478AIMF (X5892A00)
Analog to Digital Converter
DM: IC201
1
A
2345678
IN V
+ IN
OUT
AAA
+ VIN
+ IN OUT
BBB
+
B
+
1
2
3
A
B
GND
5
4
Vcc
Y
INPUTS
FUNCTION TABLE
OUTPUT
AB Y
H
L
L
H
X
L
H
L
X
1
2
3
4-V
8
7
6
5
Output A
+V
Non-Inverting
Input A
-DC Voltage Supply
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+-
+-
POWER
SWITCH
P/SW
IN 1
PRE GND
IN 2
REF
MT/SW
OUT 1
POWER GND
OUT 2
V
CC
BIAS
MUTE
CIRCUIT
Amp1
Amp2
1
2
3
4
56
7
8
9
10
1
2
34
6
5
V
DD
V IN T/H SCLK
CS
SDATA
SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
GND
Oscillating circuit
Counter timer
Vref
-
+
1
3
4
5
GND ER
V
DD
Vout
BD45365G (X5888A00)
Reset
DM: IC103
Oscillating circuit
Counter timer
Delaying circuit
+
-
1
3
2
4
5
N.C DS
V
DD
V SS
OUT
S-80136ANMC-JCV-T2 (X4374A00)
Reset
DM: IC103
V REF