BOSS DD 3T SERVICE NOTES 3rd

Page 1

May 2002

DD-3(T)

@BUSSDD_3 T

Digital Delay

SPECIFICATIONS ...........................................
LOCATION OF CONTROLS,PARTS LIST ..
EXPLODED VIEW,PARTS LIST
PARTS LIST ..................................
ADJUSTMENTS
CIRCUIT BOARD. ..
CIRCUIT DIAGRAM .................................................... 1

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WARNING

There are three types of DD-3(T) with different circuitry called DD-3, DD-
3A and DD-38. The pedals of all three types are labeled DD-3.

We call the new type of this model, 1313-33 for identifying the old type and
new type for convenience on service system.

Check the model name as follows.

0f the three types, only the appearance of the "DD-3 is different. Identify the
DD-3 or the DD-3A or DD-3B by the shape of the adapter jack as shown in
the following figure.

The appearance of the DD-3A and the DD-3B are the same. Due to a
DRAM change, it has been changed to DD-3B from serial No. 3091on of
1912LOT (produced in August 2001). It can be identified by the serial number.
The DD-3A and "DD-33 can also be identified by the silk-screen printing
on the board.

When referring to the service notes or ordering parts, check the model name
using the above process.

This service note is for the DD-SB. Refer to DD-3A SERVICE NOTES
(7059557) when repairing the DD-3A. Variable resistor, switch and
mechanical parts for the "DD-3A and DD-3B are compatible. Refer to DD-
2/3 SERVICE NOTES (#17059183) when repairing the DD-3.

ID WE]

DD-3A or DD-3B DD-3

SERVICE NOTES
Third Edition
Issued by RJA

CHECK L. BOOms HOLD

E.LEVEL F.BACK

MIN MAX MIN MAX

(- OUTPUT INPUT(-
DIRECT OUT-)

Digital Delay
00-3

[EIIBDSS

Copyright © 2002 ROLAND CORPORATION

All rights reserved. No part of this publication may be reproduced in any form without the written permission

of ROLAND CORPORATION.

Roland 1705955753

Printed in Japan (0800) (AS)

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May 2002

SPECIFICATIONS Options

AC Adaptor ISA-Series
Power Supply * 0am = 0.775 vas

DC 9 v; Dry battery (6AM6/9V)
AC Adaptor (PSA-series: oplion)

Current Draw

45 mA to 65 mA (DC 9V)

Controls

Pedal Switch
EFFECT LEVEL
FEEDBACK

DELAY TIME

MODE SELECTOR Switch
In d icator

Check Indicator (serves also as battery check indicator)

Jacks

INPUT

DIRECT OUTPUT
MAIN OUTPUT
AC Adaptor
System

Analog logalithmic compression and 12 bit quantizing system

Delay Time

12.5 ms (MIN) to 800 ms (MAX)
5 (Short) 50 ms (12.5 ms to 50 ms)
M (Middle) 200 ms (50 ms to 200 ms)
L (Long) 800 ms (201] Ins to 800 ms)

Hold Time

200 ms (MIN) to we ms (MAX) in Hold mode

Frequency Response

Delay Sound: 40 Hz to 7 kHz; +1/-3 dB
Direct Sound: 10 Hz to 60 kHz; +1/-3 dB
Residual Noise

.95 dBu (IHE-A, Typ.)

Input Impedance
1 Mohnl

Output Load Impedance

10 k OhIn or greater

Dimensions

73 (W) x 129 (D) x 59 (H) mm

2-7/8 (W) x 5-1 /s (D) x 2-3/3 (H) Inches
Weight

450 g / 1 lb (including battery)

Accessories

OWNERS MANUAL ENGLISH(#26(13768702)
]APANESE(#2603768603)

Dry Battery(#""""); 6AM6/9V (Alkaline)
Leaflet (USING THE UNIT SAFELY, IMPORTANT NOTES, and
Information)

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