BOSS AUDIO SYSTEMS Boss Dd-3 Digital Delay Pedal

DD-3(T)

May 2002

SERVICE NOTES Third Edition

Issued by RJA

SPECIFICATIONS............................................................. 2 LOCATION OF CONTROLS,PARTS LIST ................... 3 EXPLODED VIEW,PARTS LIST ..................................... 4 PARTS LIST........................................................................ 5 ADJUSTMENTS ................................................................ 8 CIRCUIT BOARD.............................................................. 9 CIRCUIT DIAGRAM...................................................... 10

WARNING There are three types of DD-3(T) with different circuitry called “DD-3”, “DD3A” and “DD-3B”. The pedals of all three types are labeled “DD-3”. We call the new type of this model, DD-3B for identifying the old type and new type for convenience on service system. Check the model name as follows. Of 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. SO91200 of 1912LOT (produced in August 2001). It can be identified by the serial number. The “DD-3A” and “DD-3B” 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-3B”. Refer to “DD-3A SERVICE NOTES” (#17059557) when repairing the DD-3A. Variable resistor, switch and mechanical parts for the “DD-3A” and “DD-3B” are compatible. Refer to “DD2/3 SERVICE NOTES” (#17059183) when repairing the DD-3. fig.notice

DD-3A or DD-3B

DD-3

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.

17059557E3

Printed in Japan (0800) (AS)

May 2002

SPECIFICATIONS

Options AC Adaptor PSA-Series

Power Supply

*

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

Current Draw 45 mA to 65 mA (DC 9V)

Controls Pedal Switch EFFECT LEVEL FEEDBACK DELAY TIME MODE SELECTOR Switch

Indicator 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) S (Short)

50 ms (12.5 ms to 50 ms)

M (Middle)

200 ms (50 ms to 200 ms)

L (Long)

800 ms (200 ms to 800 ms)

Hold Time 200 ms (MIN) to 800 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 (IHF-A, Typ.)

Input Impedance 1 M ohm

Output Load Impedance 10 k ohm or greater

Dimensions 73 (W) x 129 (D) x 59 (H) mm 2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches

Weight 450 g / 1 lb (including battery)

Accessories OWNER’S MANUAL

ENGLISH(#2603768702) JAPANESE(#2603768603)

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

2

0 dBu = 0.775 Vrms

DD-3(T)

LOCATION OF CONTROLS,PARTS LIST fig.panel

No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

PART CODE 2253753801 2221740401 22017993RT 2247726200 13279869 13449105MF 2235730400 2202785100 2235730500 G253751603 13449711 1502928100 2247726200 13119308 2247726200 13289126 F3449112 13449140MF 22187547RT

PART NAME PSA CAUTION PANEL CASE KNOB (BLUE) POTENTIOMETER JACK FOOT BASE (PEDAL MAT) BOTTOM COVER BOTTOM BASE BOTTOM CAUTION PSA AC ADAPTOR JACK LED (RED) KNOB (BLUE) SWITCH (ROTARY) KNOB (BLUE) POTENTIOMETER JACK (STEREO) JACK (STEREO) PEDAL

DESCRIPTION 253-538

247-262 RKO971110 50KB HTJ-064-14I 235-304 202-851 235-305 FCC/CE/C-TICK/EMC GRY HEC-0470-01-630 L-34HDSL 247-262 SBM1024 (SRBM 14011A) 247-262 RK0971110 10KA 15MM HTJ-064-13D HTJ-064-14D

3

May 2002

EXPLODED VIEW,PARTS LIST fig.explo

10 1 1 d 2 a

9

8

b

3

7

6 c

4

5

[PARTS] No. 1 2 3 4 5 6 7 8 9 10

PART CODE 13129710 2226733300 F3419102 G25375160