YAMAHA SY77 SERVICE MANUAL ocr

MUSIC SYNTHESIZER ■ CONTENTS (B *) S P E C IF IC A T IO N S (IS'ÊH ifêO......................................................................... 2 PAN EL LA YO U T U * * U Y T ^ F)......................................................... 4 C IR C U IT B O A R D LA Y O U T (a.- « y F U T y O F).......................... 6 B L O C K D IA G R A M (7 ' P 7 ^ ^ 7 ^ A)......................................... 8 D IS A S S E M B L Y P R O C E D U R E.......................................... 1 0 A S S E M B L Y P R E C A U T IO N S (M ^ B # < 7> Æ 7»*ijf)..............................1 5 LSI PIN D E SC R IP T IO N (L S I ^ T M t it ^).................................................1 7 IC B L O C K D IA G R A M (I C 7 p "j? m)........................................ 2 3 C IR C U IT B O A R D S (S ' - F * « E I).............................................................2

1 MUSIC SYNTHESIZER SERVICE MANUAL SY77 'S ■ CONTENTS ( B * ) S P E C IF IC A T IO N S (IS'ÊH ifêO ......................................................................... 2 PAN EL LA YO U T U * * U Y T ^ F ) ......................................................... 4 C IR C U IT B O A R D LA Y O U T ( a .- « y F U T y O F ) .......................... 6 B L O C K D IA G R A M ( 7 ' P 7 ^ ^ 7 ^ A ) ......................................... 8 D IS A S S E M B L Y P R O C E D U R E .......................................... 1 0 A S S E M B L Y P R E C A U T IO N S (M ^ B # < 7> Æ 7»*ijf)..............................1 5 LSI PIN D E SC R IP T IO N ( L S I ^ T M t it ^ ) .................................................1 7 IC B L O C K D IA G R A M ( I C 7 p "j ? m ) ........................................ 2 3 C IR C U IT B O A R D S ( S ' - F * « E I ) .............................................................2 5 E R R O R M E S S A G E S ( 1 7 — ................................................4 4 T E S T P R O G R A M ( 7^ h 7 " p ^ * 7 A ) - ...........................................4 8 / 7 2 M IDI DATA F O R M A T (MIDI -r — ? 7 * - v *y F ) ............................... 9…