Yamaha DX21 Service Manual

DIGITAL PROGRAMMABLE ALGORITHM SYNTHESIZER
DX21
SERVICE MANUAL
■ CONTENTS
IMPORTANT NOTICE. 1
SPECIFICATIONS. 1
PANEL LAYOUT. 2
TEST PROGRAMS.3/4
BASIC CIRCUIT OPERATIONS. 5
TABLE OF 1C PIN FUNCTIONS. 6
MIDI DATA FORMAT.7 ~ 17
CIRCUIT BOARDS .18~21
BLOCK DIAGRAM . 22
PARTS LIST
OVERALL ASSEMBLY .23/24
KEYBOARD ASSEMBLY. 25
LCD ASSEMBLY & WHEEL ASSEMBLY. 26
CIRCUIT BOARDS & ELECTRICAL PARTS
.27~29
OVERALL CIRCUIT DIAGRAM. 30
006667
NIPPON GAKKI CO., LTD. HAMAMATSU, JAPAN
2.93K-403
(HI
® Printed in Japan '85.6.