DD-20(T)_DEGITAL DELAY (EN)

COVER/TABLE OF CONTENTS

Mar.2003 DD-20(T) SERVICE NOTES Issued by RJA TABLE OF CONTENTS SPECIFICATIONS.............................................................2 LOCATION OF CONTROLS ..........................................4 LOCATION OF CONTROLS PARTS LIST ...................5 EXPLODED VIEW ............................................................6 EXPLODED VIEW PARTS LIST .....................................9 PARTS LIST......................................................................10 CHECKING THE VERSION NUMBER.......................14 RESTORING THE FACTORY SETTINGS...................14 TEST MODE.....................................................................14 BLOCK DIAGRAM.........................................................22 CIRCUIT BOARD (JK-A) ...............................................24 CIRCUIT BOARD (JK-B)................................................25 CIRCUIT BOARD (PANEL-A)......................................26 CIRCUIT BOARD (PANEL-B).......................................27 CIRCUIT DIAGRAM (JACK) ........................................28 CIRCUIT DIAGRAM(PANEL)......................................30 Copyright © 2003 ROLAND CORPORATION All rights reserved.

No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION. Printed in Japan (0800) (NB) 17058152E0

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SPECIFICATIONS

Mar.2003 SPECIFICATIONS Connectors DD-20: DIGITAL DELAY INPUT A (MONO) Jack (1/4 inch phone type) INPUT B Jack (1/4 inch phone type) PHONES Jack (stereo 1/4 inch phone type) CTL PEDAL Jack (1/4 inch phone type) Nominal Input Level • 20 dBu (GUITAR/BASS) +4 dBu (AMPLIFIER SEND/RETURN) OUTPUT A (MONO) Jack (1/4 inch phone type) OUTPUT B Jack (1/4 inch phone type) AC Adaptor Jack Input Impedance Power Supply 1 M[ohm] Dry battery (R6/LR6 (AA) type) x 6: DC 9V AC Adaptor (DC 9V) Nominal Output Level • 20 dBu (GUITAR/BASS) +4 dBu (AMPLIFIER SEND/RETURN) Current Draw 200 mA (9 V max.) Output Impedance Carbon: 2 hours * Expected battery life under continuous use:

1 k[ohm] (OUTPUT A (MONO), B) 33 [ohm] (PHONES) Alkaline: 7 hours These figures will vary depending on the actual conditions of use. Recommended Load Impedance Dimensions 10 k[ohm] 173 (W) x 158 (D) x 57 (H) mm Residual Noise Level 6-13/16 (W) x 6-1/4 (D) x 2-1/4 (H) inches Weight • 93 dBu or less (IHF-A typ.) * E. LEVEL/F. BACK/TONE knobs are set to the center position 1.2 kg / 2 lbs 11 oz (including batteries) Display Accessories Custom LCD (with backlit) Owner’s Manual JAPANESE:(#G6017365) Controls Dry battery (LR6 (AA) type) x 6(#********) ENGLISH:(#G6017366) ON/OFF Pedal MEMORY/TAP Pedal * We recommend that alkaline batteries be used when replacing the batteries.

DELAY TIME Knob Options E.LEVEL Knob F. BACK Knob AC Adaptor (PSA-series) * 0 dBu = 0.775 Vrms TONE Knob MODE Knob * In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice. TAP Button TEMPO Button MEMORY WRITE Button MEMORY SELECT Button Indicators POWER Indicator (serves also as battery check indicator) ON/OFF Indicator MEMORY Indicator TAP Indicator MANUAL Indicator MEMORY Number Indicator 1-4 TEMPO Indicator 2

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SPECIFICATIONS

DD-20(T) 3

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LOCATION OF CONTROLS

Mar.2003 LOCATION OF CONTROLS fig.panel-p L M 16 21 17 N 18 19 20 22 3 6 H 2 7 B 1 4 A C C D 5 I J 15 9 E F G 10 K D 11 12 13 14 8 4

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