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Yamaha Manuals
Musical Instrument
Portable Grand DGX-305
Service manual
Yamaha Portable Grand DGX-305 Service Manual page 62
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:
Owner's manual
(112 pages)
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DGX-305/DGX-505
起動フローチャート
Power ON
CPU
各種レジスタ設定
ポートの初期化
MKS /IC=L
MKS ACK=H
USB CPU /IC=L
LCD /IC=L
LCD DISP=L
ワークRAM初期化
LCD /IC=H
MKS /IC=H
LCD DISP=H
ここまでこない
CPUまたはCPU周辺
(ROM/RAM/Flash) の不良
LCD初期化
オープニング
(音叉マーク)
メディアの
チェック
音源初期化
(SWP Register)
Swドライブ信号
出力
LEDドライブ信号
出力
MIDI受信開始
62
外部RAMへの
アクセスが発生する
LCD-Cにコマンド
及びデータ送信
表示されない
LCD又はLCD-Cの不良
Flashにコマンド送信
リードライト
割り込み機能設定
タイマカウント
優先順位
鍵盤受信開始
(MKS)
MKS ACK=L,H
割り込み解除
USB CPU /IC=H
Yes
テスト
モード?
No
テスト
プログラム
表示
テストに入れない
鍵盤又はMKSの不良
鍵盤で音を鳴らすことが可能
USBマイコン
初期化
MIDIで音を鳴らすことが
可能
Yes
バックアップ
No
バックアップ
クリア表示
メイン画面
表示
毎回クリア表示
Flash不良
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