DD 7 SERVICE NOTES

Table of Contents

May.

2008 DD-7 SERVICE NOTES Issued by RJA Table of Contents Cautionary Notes ..............................................................2 Main Specifications...........................................................3 Location of Controls .........................................................4 Location of Controls Parts List........................................4 Exploded View ..................................................................5 Exploded View Parts List.................................................5 Parts List.............................................................................6 Verifying the Version Number........................................8 Performing a Factory Reset..............................................8 Updating the System ........................................................8 Test Mode...........................................................................9 Circuit Board (Main Board) ...........................................17 Circuit Diagram (Main Board:

Analog) .......................18 Circuit Diagram (Main Board: Digital) ........................20 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 (0290) (CC-KWS) 17058564E0

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Cautionary Notes

May. 2008 DD-7 Cautionary Notes Before beginning the procedure, please read through this document. The matters described may differ according to the model. No User Data This product cannot save user data. Backing up user data during servicing is not required. Parts List A component whose part code is ******** cannot be supplied as a service part because one of the following reasons applies. • Because it is supplied as an assembled part (under a different part code). • Because a number of circuit boards are grouped together and supplied as a single circuit board (under a different part code). • Because supply is prohibited due to copyright restrictions. • Because reissuance is restricted.

• Because the part is made to order (at current market price). Circuit Diagram In the circuit diagram, “NIU” is an abbreviation for “Not in Use,” and “UnPop” is an abbreviation for “Unpopulated.” They both mean non-mounted components. The circuit board and circuit board diagram show silk-screened indications, but no components are mounted. 2

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Main Specifications

May. 2008 DD-7 Main Specifications DD-7: Digital Delay Nominal Input Level Dimensions -20 dBu 73 (W) x 129 (D) x 59 (H) mm 2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches Input Impedance Weight 1 M Ω 440 g / 1 lb (including battery) Nominal Output Level Accessories - 20 dBu Owner’s Manual English (#G2507366R0) Output Impedance Mode Sticker (#G2547154R0) Application Sticker (#G2547160R0) 1 k Ω Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”) (#********) Recommended Load Impedance Dry battery/9 V type (6LR61) (#********) 10 k Ω or greater * The battery that was supplied with the unit is for temporary use-intended primarily for testing the unit’s operation.

Delay Time We suggest replacing this with an alkaline dry cell. 1 ms to 6400 ms Options * Values may vary according to the mode and connections. AC adaptor (PSA-series) Maximum Recording Time 40 seconds (in HOLD mode) Controls * 0 dBu = 0.775 Vrms Pedal switch E.LEVEL knob, F.BACK knob, D.TIME knob, MODE knob * In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice. Indicator CHECK indicator (Used for indication of TEMPO, HOLD, and to check battery) Connectors INPUT-A (MONO) jack, INPUT-B jack OUTPUT-A (MONO) jack, OUTPUT-B jack TEMPO/EXP jack, AC adaptor jack (DC 9 V) Power Supply DC 9 V:

Dry battery 6F22 (9 V) type (carbon) Dry battery 6LR61 (9 V) type (alkaline) AC Adaptor (PSA-series: optional) Current Draw 55 mA (DC 9 V) Expected battery life under continuous use: Carbon: 1.5 hours * These figures will vary depending on the actual conditions of use. Alkaline: 6 hours 3

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Location of Controls Parts List

May. 2008 DD-7 Location of Controls fig.panel.eps Location of Controls Parts List 4 No. Part Code Part Name Description Q’ty 1 75E593C0R0 CASE 1 2 G2537516R0 PSA CAUTION CE 9V N225 1 3 13449717 ADAPTOR JACK HEC2392-01-150 1 4 F5029423R0 LED L-3VEGW 1 5 G2477127R0 ROUND KNOB D-CUT (BLUE/BLACK) 3 F3279852R0 POTENTIOMETER RD901-20-15FW-B54-006 3 6 G2477127R0 ROUND KNOB D-CUT (BLUE/BLACK) 1 F3229206R0 POTENTIOMETER RD901-20-15FW-B50K-08Q7 8CLIC 1 7 F3449150R0 JACK (STEREO+SW) 2LJ-650NHW00 2 8 03344701 6.5MM JACK HTJ-064-12DS 1 9 13449140R0 JACK(STEREO) HTJ-064-14D 2 10 75E592T0R0 PEDAL 1 11 22357304R0 PEDAL PLATE 1 12 G2217798R0 PANEL PLATE 1 13 40125101 THUMB SCREW M3X10 FE ZC 1

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