BOSS DD 3A SERVICE NOTES

Page 1

Apr, 1991

DD-3A

[EIIBDSS DID-3 A

Digital Delay

SPECIFICATIONS/(iii

1M0
10kQ or more
Less than -95dBm (lHF-A vvtd)

Input Impedance ~
Output Load Impedance --
Residual Noise -------
Frequency Response ~-

Delay Sound 40Hz ~ 7kHZ (+1, A3dB)
DirectSound -~ 10Hz ~ GOkHz (+1, -3dB)
Delay Time ....................
at StSOmS MODE ------- 1215 ~ 50ms
at MZOOmS MODE ----- 50 ~ 200m5
at L.800ms MODE 200 ~ 800ms
Hold me ........................
at HOLD MODE ------- 200 ~ 800ms
Power Source ------------------- DC 9V: Battery (6AM6 type)

or AC Adaptor (PSA series)
DC 9V, 45 ~ 65mA

Power Consumption

Dimensions ------------ 70(W) x 55(H) x 125(D) mm
2-3/4(W) X 2-3/16(H) x 445/1510) inch
Weight ............................ 4509 / 1 lb
Accessories (Standard)
Battery ~~~~~~~~~~~~~~~~~ 6AM6 (or 6LR61) type

(Alkaline-Mn Batteries)
Owners Manual ~~~~~~~~ Japanese (2603068600)
English (2603063700)

SERVICE NOTES

F irst Edition

Accessories (Optional) ------ AC Adaptor PSA Series

NOTES:

1, 0 dBm is referenced to 0.775Vrms.

2, The use of a PSA series (BOSS AC adopter) and a alkaline
battery (6LR61 or 6AM6 type) rather than ACA series (BOSS AC
adaptor) and a manganese battery (S-OOGP type) is recom-
mended for longer time performance, as the DD-3 cosumes
more current than usual compact effect units.

(111%:
1 0 dBm 1:, 0775 Vrlns tL'riemensD
z DD»31;t, (1%»: 7/17 1» ~l71. 7 7-1Lttrsfin were
1mm. AC 7v7yet L11: ACA 911-1; 0 0 PAS ~> I) 7
Hr. 331M Lfiivflfziamisroosp 7171;111), 71m
Simona New; 6AMO yrflti-tfiiixr'rew

PSA Caution

Jack

(2253053801)

Panel
(2221040400)

Case -_-

(2201099300)

Pot.
RK0971110 50kB
(13279869)

(13449105)

Foot Base
(2235030400)

Cover
(2202085100)

Bottom Base -1
(2235030500)

Bottom Caution-
(2253053900)

Jame-g _ «3123
SG7615 #07 2 H

HEC0470-01-630
(13449711)

LED
LN-28RP
(15029198)

Rotary Switch
SRBM14011A
(13119308)

Pot.
RK0971110 10kA
(13289126)

(amt - ~- Jack
~ 6 , 30-7713 115
(13449104)

\ . '3

§\--Jack
L SG-7701 #14
(13449140)

'- Pedal

(2218054700)

ALL Knobs
Blue
(2247026200)

@Roiand 17059557

Printed in Japan (BBEO) (CR)

1

NOTICE

This notes is for use to service the DD-3A .

For DD-3, there are 2 types, old type and new one, of
DDAB having a little difference of circuitry.

Usualy, old type is written "DD»3" and new one is
written "DD-3A" for the model number. But they are
inscribed "DD-3" on the panel both types.

If you wish to make sure of the model number, you
ought to see the type of adaptor jack as shown below.

Please confirm the model number like this, when refer
to SERVICE NOTES and ordering any parts.
Besides, this SERVlCE NOTES is for MODEL NUMBER
DD-3A.

If service the DD-3, please refer to the DD-2/3 SERVlCE
NOTES.

SEE

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en, :17); 51: LTWéEHEEEl/TTewo

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NOTES EfififiLTTewo

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ID

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E

D D a 3A
EXPLODED VIEW/5H?-

Switch

Cushion
(2226033300)

Nylon Washer
3x6x0.5(xm/-
Binding Machine 4

3 x 10 FeBC (x 2)

Battery Connector
(2341041400)

Binding Tapping -§;
3 x 6 B1 FeBC (x 4)

Bottom Caution
(2253053900)

JM-0404
(13129710) /,

Thumb Screw
3 x 10 (Black)

Pedal Guide
(2215070201)

Insulation Spacer
(2216059400)

Cover
(Bottom Cover)
(2202085100)

Botto m Ba se
(Base)
(2235030500)

Page 2

DD-3A Apr, 1991

PARTS LIST/l\°- 7 U 1 l~ ODE/5 71- V
15019125 133-133
15019526 RD-5, 6EB»3 Zener
SAFETYPRECAUT/ONS: CONSIDERATIONS ON PARTS ORDERING 150192091-0 8-55006
The parts mar/red A have When ordering any parts listed in the parts list, please specify the following items in the order sheet.
safety-related characteristics. on PART NUMBER DESCRIPTION MODEL NUMBER RESISTOR /1gfia§
. E . 70 22575247 Slia Ke 020/50
59 0" "9 ° X 75 2247077300 Knab 1.1.6.19; mama 13919175 RKM14L472-942F R-2R Ladder
r 998 en 1 Failure to completely fill the above items with correct number and description will result in delayed or
§$i033§ I even undelivered replacement. POTENTIOMETER/ 31335217135
AfiELUféafifm' 33% 13279869 RK0971110 50kB F. BACK, E. LEVEL
1651 demx omega): 71-51-9- 111-13, 15512530} AGBlaEEfiloiAbTTégo (17191131150 13289126 RK0971110 mm D. TIME
90 M E 211 MiJf/Mi on 1?. 125311515 .
51> -10 "22575241 Shar K C-_20/ 13299242 RH06150 1kB TrImmer
35009513 eeentaisaoe D By 50 .
' a L 15 2247017300 Knob (Oran e) DACV15D 13299243 RH0615C 47KB TrImmer
Drlslmereimbruck l g
'1 d D EJL/Ekifih. 3%3§b§%fl%3. @§Efl$b§éi§$5fi-��bot% tfieenmemzrau 39.,
LC'FEUD {figmemeubgan INDUCTOR, COIL/4 /§7 3', :1 11b
13529145 DSS306~55FZ103N EMI Filter
OPTICAL DEVICE/ 96135311155
CAS'NGflT-x 15029198 LN-28RP LED (Redl
2221323333 32:1 WIRING, CABLE/'7 1f \" U / 7, J- 7)»
2202085100 Cover (Bottom Cover) 2347033600 Flat Cable A 4p
2235030500 Bottom Base (Base) 2347033700 Flat Cable B 3p
2218054700 Pedal 0
2235030400 Foot Base (Pedal Mat) SCREW/n WE
. _ ********** Thumb screw 3 x 10 (Black)
KNOB, BUTTON/Oil}, lit/L HHHHH 3 x 6 Binding Tapping B1 Fe BC (4 pcs for Bottom 3656)
2247026200 Knob (Blue) 10mm ********** 3 x 10 Binding Machine Fe BC (2 pcs for Pedal)
********** Nylon Washer 3 x 6 x 0.5 (2 pcs for Pedal)
SWITCH/X f 1 9" ********H 3 x 6 Binding Tapping B1 FeCr (1 pcs for LED Board)
13119308 SRBM14011A Rotary SW MODE
MISCELLANEOUS/ % (7)1111
13129710 JM-0404 Keyboard SW
t. 2215070201 Guide Bushing (Pedal Guide)
JACK, SOCKET/7 1' y 7 , J '7' *7 l~ 2226033300 Cushion
13449711 HEC0470-01-630 AC Adaptor Jack 2217010900 Spring (Coil Spring)
13449104 86-7713 #5 1/ " Jack INPUT 2341041400 Battery Snap (Battery Connector)
13449105 86-7615 #07 1/ " Jack OUTPUT 2216059400 Insulation Spacer (Plastic Sheet, Clear large type)
13449140 SG-7701 ii 14 1/4" Jack DIRECT OUT 2:333:32331 Bottom Cautlon
PSA Caution
PCB ASSV/ £15151 ' 2225025700 Earth Lug
7527351000 PCB Assy (pcb 2292098400) ANDARD ~ n
NOTE : Replacement MT Board includes VR Board and SW Board. ACCESSORIES (ST )/E$HE
112 : 1014,5111 PCB #13:): 11 MT £1112, VR £1171, LED 5117:7333: hi 1'0 2603068600 Owners Manual (Japanese)
********** MT Board (pcb 2292093400) 2603068700 Owners Manual (English) (lnotructions)
********** VR Board (pcb 2292098400) . .9 . .¢ 0 t
HHHHH LED Board (pcb 2292098400) PCB ASSEMBLYPJ ' 7 L4 1
. .
"Vim? ASSY 7527351000 1 l 1
15229875 MN51010RBA Gate Array |C7 i
15179334 M5M4454L-12 D-RAM 1C6 ; ~ @400 l VR
15159115H0 HD14OGGBP Analog SW (CMOS) ICS 1
15169515 TC74HCO0P NAND Gate (CMOS) 1C4 i BOARD
15219108 NE-570N Noise Reduction 1C2 MT BOARD -
15189250 M5218AL OP Amp |C1
15189203 uPC4072HA OP Amp |C8 ' W .
15189111J1 NJM-311D Comparator 105 _ffll_l§5§§ll 11%
15199109J0 NJM78L05A Voltage Regulator |C9 ') 7 ~ Vgfillfi
_ .. 1 It: 1;»
TRANSISTOR/1V7VVZ51- ' a $050 6*-
M
15129186 280-337BGR s .
or15129120 280-2240GR a 3,: :3, . LED BOARD
15129185 23C-24586R View from foil side . rs I --
15139131 ZSK-184-GR FET
or 15139106 28K-117-GR i l
151391160Y 28K~118-Y FET

NOTE 1 Replacement PCB Assy includes MT Board, VR Board and LED Board.
157911515 PCB timing, MT 25111, VR £111 LED 5112751555510