BOSS DD-3T Service Manual

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May 2002

DD-3(T)

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 “DD- 2/3 SERVICE NOTES” (#17059183) when repairing the DD-3.

DD-3A or DD-3B

DD-3

17059557E3

Printed in Japan (0800) (AS)

May 2002

SPECIFICATIONS

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”)

Options

AC Adaptor PSA-Series

*0 dBu = 0.775 Vrms

DD-3(T)

LOCATION OF CONTROLS,PARTS LIST

fig.panel



























No.	PART CODE	PART NAME	DESCRIPTION
1	2253753801	PSA CAUTION	253-538
2	2221740401	PANEL
3	22017993RT	CASE
4	2247726200	KNOB (BLUE)	247-262
	13279869	POTENTIOMETER	RKO971110 50KB
5	13449105MF	JACK	HTJ-064-14I
6	2235730400	FOOT BASE (PEDAL MAT)	235-304
7	2202785100	BOTTOM COVER	202-851
8	2235730500	BOTTOM BASE	235-305
9	G253751603	BOTTOM CAUTION PSA	FCC/CE/C-TICK/EMC GRY
10	13449711	AC ADAPTOR JACK	HEC-0470-01-630
11	1502928100	LED (RED)	L-34HDSL
12	2247726200	KNOB (BLUE)	247-262
	13119308	SWITCH (ROTARY)	SBM1024 (SRBM 14011A)
13	2247726200	KNOB (BLUE)	247-262
	13289126	POTENTIOMETER	RK0971110 10KA 15MM
14	F3449112	JACK (STEREO)	HTJ-064-13D
15	13449140MF	JACK (STEREO)	HTJ-064-14D
16	22187547RT	PEDAL

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