Mar.
2008 MT-90U SERVICE NOTES Issued by RJA Table of Contents Cautionary Notes ..............................................................2 Main Specifications...........................................................2 Location of Controls (Front Panel) .................................4 Location of Controls (Front Panel) Parts List................4 Location of Controls (Rear Panel)...................................5 Location of Controls (Rear Panel) Parts List .................5 Exploded View (All) .........................................................6 Exploded View (All) Parts List........................................7 Exploded View (1).............................................................8 Exploded View (1) Parts List...........................................9 Exploded View (2)...........................................................10 Exploded View (2) Parts List.........................................10 Important Notes on Assembly ......................................11 Block Diagram/Wiring Diagram..................................14 Parts List...........................................................................16 Verifying the Version Number......................................18 Performing a Factory Reset............................................18 Updating the System ......................................................18 Test Mode.........................................................................18 Circuit Board (Main Board) ...........................................22 Circuit Diagram (Main Board:
1/4)..............................24 Circuit Diagram (Main Board: 2/4)..............................26 Circuit Diagram (Main Board: 3/4)..............................27 Circuit Diagram (Main Board: 4/4)..............................28 Circuit Board (Panel Board)...........................................30 Circuit Diagram (Panel Board)......................................32 Circuit Board (Jack, Volume, IR, USB, Power SW Board)................................................................................34 Circuit Diagram (Jack Board: 1/3)................................36 Circuit Diagram (Jack Board: 2/3)................................38 Circuit Diagram (Jack Board:
3/3)................................40 Circuit Diagram (Volume Board)..................................42 Circuit Diagram (IR Board)............................................44 Circuit Diagram (USB Board)........................................44 Circuit Diagram (Power SW Board) .............................45 Copyright © 2008 Roland Corporation All rights reserved. No part of this publication may be reproduced in any form without the written permission of Roland Cororation. Printed in Japan (0285) (CC-KWS) 17058572E0