BOSSCO Boss DD-3A Operating and maintenance manual

SERVICE NOTES
Third Edition
Issued by RJA
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.
Printed in Japan (0800) (AS)17059557E3
May 2002 DD-3(T)
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”, “DD-
3A” 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.
fig.notice
DD-3A or DD-3B DD-3

2
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
*0dBu = 0.775 Vrms

3
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

4
May 2002
EXPLODED VIEW,PARTS LIST
fig.explo
[PARTS]
[SCREW]
No. PART CODE PART NAME DESCRIPTION Q’TY
1 13129710 SWITCH (PUSH) JM-0404 1
2 2226733300 CUSHION 267-333 1
3 F3419102 BATTERY CONNECTOR 1
4 G253751603 BOTTOM CAUTION PSA FCC/CE/C-TICK/EMC GRY 1
5 2235730500 BOTTOM BASE 235-305 1
6 2202785100 BOTTOM COVER 202-851 1
7 G2167301 INSULATION SPACER 1
8 2215770201 PEDAL GUIDE BUSH 215-702 1
9 2217710900 COIL SPRING 214-109 1
10 2235730400 FOOT BASE (PEDAL MAT) 235-304 1
No. PART CODE PART NAME DESCRIPTION Q’TY
a 40125134 NYLON WASHER 3X6X0.5 2
b 40010267 SCREW M3X10 BINDING FE BZC 2
c 40010901 SCREW M3X6 BINDING B1 BZC 4
d H5029820 SCREW M3X10 THUMB SCREW 1
11
2
3
4
a
5
6
7
8
9
d
10
b
c

5
DD-3(T)
PARTS LIST
fig.part1e
CASING
2235730500 BOTTOM BASE 235-305 1
2235730400 FOOT BASE (PEDAL MAT) 235-304 1
2202785100 BOTTOM COVER 202-851 1
# 22017993RT CASE 1
# 2221740401 PANEL 1
# 22187547RT PEDAL 1
KNOB,BUTTON
2247726200 KNOB (BLUE) 247-262 4
SWITCH
13119308 SBM1024 (SRBM 14011A) SWITCH (ROTARY) SW1 1
13129710 JM-0404 SWITCH (PUSH) SW2 1
JACK,EXT TERMINAL
F3449112 HTJ-064-13D JACK (STEREO) JK1 1
13449140MF HTJ-064-14D JACK (STEREO) JK2 1
13449105MF HTJ-064-14I JACK JK3 1
13449711 HEC-0470-01-630 AC ADAPTOR JACK JK4 1
PWB ASSY
#75D563P000 MT BOARD ASSY DD-3B 1
IC
15289402 TA78L05F(TE12L) IC (REGULATOR) IC9 1
15289148 M5218AFP IC (OP AMP) IC1 1
15229875 MN51010RBA BOS-008 IC (GATE ARREY) IC7 1
02343090 M11B416256A-35J(T) IC (DRAM) IC11 1
15289118 NJM311M IC (COMPARATOR) IC5 1
# F5289115 NJM319M IC (COMPARATOR) IC10 1
# F5289113 SA571D IC (COMPANDOR) IC2 1
15159115T1 TC4066BP IC (C MOS) IC3 1
15249114T0 TC74HC00AF SOP IC IC4 1
15289155 UPC4072G2 IC IC8 1
TRANSISTOR
15319108 2SC-3324GR-TE85R TRANSISTOR Q1,Q3-Q5,Q7-Q9 7
F5329530 2SK879Y FET TRANSISTOR Q2,Q10 2
15329103T0 2SK880-GR(TE85R) FET TRANSISTOR Q6,Q11 2
DIODE
01019534 1SS355 TE-17 SWITCHING DIODE D1-D8 8
1502928100 L-34HDSL LED (RED) LED1 1
F5339201 GS1G DIODE D9 1
F5339312 RD5.6S B3 DIODE D10 1
RESISTOR
F5419705 CRN34103J RESISTOR ARRAY RA2-RA4 3
13919175 RKM14L472/942F RESISTOR ARRAY RA1 1
00567023 RPC05T 101 J MTL.FILM RESISTOR R24 1
00567156 RPC05T 102 J MTL.FILM RESISTOR R2,R26,R43 3
00567289 RPC05T 103 J MTL.FILM RESISTOR R3,R5,R10,R18-R22,R27,R36-
R40,R42,R44,R45,R4
26
00567412 RPC05T 104 J MTL.FILM RESISTOR R1,R7,R23,R25,R47 5
00567556 RPC05T 105 J MTL.FILM RESISTOR R6,R60,R61 3
00567045 RPC05T 151 J MTL.FILM RESISTOR R30 1
SAFETY PRECAUTIONS:
The parts marked have
safety-related characteristics. Use
only listed parts for replacement.
CONSIDERATION ON PARTS ORDRING
When ordering any parts listed in the parts list, please specify the following items in the order sheet.
QTY PART NUMBER DESCRIPTION MODEL NUMBER
Ex.10 22575241 Sharp Key C-20/50
15 2247017300 Knob (orange) DAC-15D
Failure to completely fill the above items with correct number and description will result in delayed or even
undelivered replacement.
NOTE: The parts marked # are new. (initial parts)

6
May 2002
00567178 RPC05T 152 J MTL.FILM RESISTOR R34 1
00566912 RPC05T 220 J MTL.FILM RESISTOR R70 1
00567067 RPC05T 221 J MTL.FILM RESISTOR R31 1
00567190 RPC05T 222 J MTL.FILM RESISTOR R17,R32,R35,R69 4
00567323 RPC05T 223 J MTL.FILM RESISTOR R12,R46,R48,R53,R57 5
00567456 RPC05T 224 J MTL.FILM RESISTOR R58,R62 2
00567212 RPC05T 332 J MTL.FILM RESISTOR R41 1
00567345 RPC05T 333 J MTL.FILM RESISTOR R9,R13,R14,R67,R68,R71 6
00567112 RPC05T 471 J MTL.FILM RESISTOR R29 1
00567245 RPC05T 472 J MTL.FILM RESISTOR R16 1
00567378 RPC05T 473 J MTL.FILM RESISTOR R4,R8,R11,R15,R33,R50,R56 7
00567123 RPC05T 561 J MTL.FILM RESISTOR R66 1
POTENTIOMETER
#F5429102 RH03ADC13X 1KB TRIMMER RT1 1
# F5429103 RH03ADCS4X 47KB TRIMMER RT2 1
13289126 RK0971110 10KA 15MM POTENTIOMETER VR3 1
13279869 RKO971110 50KB POTENTIOMETER VR1,VR2 2
CAPACITOR
#F5359811 GRM39B183K50PT CHIP CAPACITOR(1608TYPE) C39 1
13639546M0 ECEA1CKA100B 10UF/16V CHEMICAL CAPACITOR C3,C10,C36-C38 5
13639550M0 ECEA1CKA101B 100UF/16V CHEMICAL CAPACITOR C1 1
13639549M0 ECEA1CKA470B CHEMICAL CAPACITOR C11,C24,C27,C46,C56 5
13639602M0 ECEA1HKA010B UF 50V CHEMICAL CAPACITOR C43,C45,C49-C51 5
13589330M0 ECQ-P1H151JZ CHEMICAL CAPACITOR C23 1
13589319 ECQP2H471JZ CHEMICAL CAPACITOR C33 1
01674701 ECJ1VF1E104Z 0.1UF/16VK CERAMIC CAPACITOR(CHIP) C25,C26,C28,C29,C52-C55 8
01674612 ECJ1VB1H103K CERAMIC CAPACITOR C18 1
01674478 ECJ1VB1H122K CERAMIC CAPACITOR C15 1
01674523 ECJ1VB1H272K CERAMIC CAPACITOR C9,C16,C30,C40,C44 5
01674556 ECJ1VB1H472K CERAMIC CAPACITOR C2,C6,C31 3
01674578 ECJ1VB1H682K CERAMIC CAPACITOR C12,C32 2
01674689 ECJ1VF1H473Z CERAMIC CAPACITOR C5,C47,C48 3
01674334 ECUV1H101JCV CERAMIC CAPACITOR C7,C42 2
01674356 ECUV1H151JCV CERAMIC CAPACITOR C13 1
01674212 ECUV1H220JCV CERAMIC CAPACITOR C22 1
01674389 ECUV1H221JCV CERAMIC CAPACITOR C41 1
01674234 ECUV1H330JCV CERAMIC CAPACITOR C4,C8 2
01674423 ECUV1H471JCV CERAMIC CAPACITOR C35 1
01674445 ECUV1H681JCV CERAMIC CAPACITOR C20 1
13619706N0 DN1VR68KIS 0.68UF/35V CAPACITOR (TANTALUM) C14,C34 2
13589312 330P CAPACITOR C17 1
INDUCTOR,COIL,FILTER
13529145 DSS306-55FZ103N EMI FILTER EMI1 1
WIRING,CABLE
# 23477336 FLAT CABLE 4P-80X10X10 P=2.5 1
# 23477337 FLAT CABLE 3P-160X10X10 P=2.5 1
# G3477157 FLAT CABLE 3P-130X10X10 P=2.5 1
SCREWS
H5029820 SCREW M3X10 THUMB SCREW 1
H5029325 SCREW 3X6 PAN HEAD TAPTITE-2 BZC 4
H5039205 WASHER 12.5X9.5X0.5/0.9 INTERNAL TOOTH FENI 3
H5039510 NUT M9X12X2 FENI 3
H5029317UC SCREW 3X6MM BINDING TAPPING B1 FECM 1
H501941301 SCREW 3X10MM BINDING MACHINE FEBC 2
40125134 NYLON WASHER 3X6X0.5 2
H5039112 WASHER M9 3
40010267 SCREW M3X10 BINDING FE BZC 2
40010901 SCREW M3X6 BINDING BI BZC 4
PACKING
G2627738 INNER BOX 1
# 2260714803 PACKING CASE 1
MISCELLANEOUS
G253751603 BOTTOM CAUTION PSA FCC/CE/C-TICK/EMC GRY 1
H5319102 INSULOK TIE 80M/M T-18S 1
2226733300 CUSHION 267-333 1
2253753801 PSA CAUTION 253-538 1
2215770201 PEDAL GUIDE BUSH 215-702 1
RESISTOR

7
DD-3(T)
2217710900 COIL SPRING 214-109 1
23410414 BATTERY CONNECTOR (006P) 1
22257257 EARTH TERMINAL 2
G2167301 INSULATION SPACER 1
H2369402 POLYCA PIPE M3X6X6 1
ACCESSORIES (Standard)
#2603768603 OWNER’S MANUAL JAPANESE 1
# 2603768702 OWNER’S MANUAL ENGLISH 1
# ******** DRY BATTRY 1
MISCELLANEOUS

8
May 2002
ADJUSTMENTS
* Adjusting the clock frequency for delay time.
1. Adjusting the high end of clock frequency (Adjusting the minimum delay time)
a. Set the VR3(D.TIME knob) to the min (fully-ccw).
b. Connect the oscilloscope to R26(1k ohm resister) or pin 5 (or pin 6) of IC3 (HD14066BP).
c. Adjust RT1 (1kB potentiometer) on MT BOARD for T=12.5±0.5uS(Fig.1).
In some types of products, turning the RT1 continuously clockwise may once go outside the adjustable range and reenter there.
Therefore, at the start, turn the RT1 fully counter-clockwise, then slowly turn it clockwise.
When the adjustable range is reached, stop turning it, then begin adjustment.
2. Adjusting the high end of clock frequency (Adjusting the minimum delay time)
a. Set the VR3(D.TIME knob) to the max(fully-ccw).
b. Connect the oscilloscope to R26(1k ohm resister) or pin 5 (or pin 6) of IC3 (HD14066BP).
c. Adjust RT2 (47kB potentiometer) on MT BOARD for T=50±2uS(Fig.2).
fig.1
fig.check3
22
21
23
5
3
4
2
1
678
9
14
151617
13
11
12
25 10
1819 20
IC3
R26RT1RT2
MAIN BOARD
View from part side
VR3(D.TIME)

9
DD-3(T)
CIRCUIT BOARD
fig.circit
fig.circit
View from component side
View from foil side

11
May 2002 DD-3(T)
CIRCUIT DIAGRAM
fig.circit
AC
ADAPTOR
9V
Batte ry
INPUT
DIRECT
OUT
OUTPUT
LED BOARD
(PCB G 292719900 3/4)
CHECK
D.TIME
MODE
F.BACK E.LEVEL
VR BOARD
(PCB G2927199 00 2/4)
DQ2
17
11
13
15
16
12
14
8
7
6
920
19
18
10
25
2
22
21
23
3
1
5
4
SW BOARD
(PCB G2927199 00 4/4)
JM-0404
(PCB G2927199 00 1/4)
MAIN BOARD
RED
GRY
BRN
YEL
BLU
EARTH TERMINAL
EARTH TERMINAL
10
25
VIO
BLK
20
19
18
13
11
17
15
16
12
BRN
RED
ORG
9
6
7
8
14YEL
45
GRN
ORG
WHT
A7
A6
A5
A4
A3
A2
A1
A0
DQ1
DQ2
DQ3
DQ4
A7
A6
A5
A4
A3
A2
A1
A0
DQ4
DQ3
DQ2
DQ1
+
+
A9
+5D
D D
D
D
D
D
D
D
D
+
A9
D
D
D
+5D
D
D
+
A9
+
A9
+5D
+5D
+
A9
+
A9
+
A9
+
A9
+
A9
+
A9
+5D
+
A9
+
A9
+
A9
+
A9 + A9
+
A9
+5D
+
+
+
++
D
+
A9
D
D
+
A9
+
A9
+5D
D
+
A9
D
+5D
D
+
A9
D
D
D
D
D
D
+5D
+5D
D
D
D
R36
10k
R38
10k
R37
10k
C31
0.0047
C30
0.0027
R45
10k
R39
10k
R42
10k
C32
0.0068
C35
470p
R55
10k
R49
10k
R51
10k
C39
0.018
C41
220p
R4
47k
R3
10k
C2
0.0047
C4
33p
+
-
IC1B
M5218AFP
6
5
7
C3
10/16
R1
100k
LED1
L-34HDSL
12
C1
100/16
R63
10k
R59
10k
C46
47/16
R54
10k
C43
1/50
C6
0.0047
R11
47k
R10
10k
R14
33k
C8
33p
C47
0.047
R60
1M
R52
10k
R44
10k
R47
100k
C36
10/16
R43
1k R7
100k
D9
GS1G
1 2
R62
220k
R58
220k
C45
1/50
R61
1M
C48
0.047
R8
47k
IC3A
HD14066BP
1 2
13
IC3D
HD14066BP
11 10
12
IC4A
TC74HC00AF
1
2
3
IC4B
TC74HC00AF
4
5
6
R13
33k
R6
1M
R9
33k
R24
100
R23
100k
1 2
IC4D
TC74HC00AF
12
13
11
C20
680p
R25
100k
R32
2.2k
C23
150pECQP
R40
10k
IC3B
HD14066BP
4 3
5
C33
470pECQP
R33
47k
IC3C
HD14066BP
8 9
6
C17
1000pECQP
R34
1.5k
R35
2.2k
IC9
TA78L05F
IN
3OUT 1
COM
2
C28
0.1
C29
0.1
C27
47/16
IC3E
HD14066BP
14
7
EMI1
DSS306-55FZ103N
1 2
+
-
IC1A
M5218AFP
2
3
1
+
-IC1C
M5218AFP
84
+
-
IC8B
uPC4072G2
6
5
7
R27
10k
C26
0.1
RH03ADC13X (1kB)
RT1
1
2
3
C25
0.1
IC2
SA571D
RECT CAP1
1
RECT IN1
2
AG CELL IN1
3
GND
4
INV. IN1
5
RES. R31
6
OUTPUT1
7
THD TRIM1
8THD TRIM2 9
OUTPUT2 10
RES. R32 11
INV. IN2 12
VCC 13
AG CELL IN2 14
RECT IN2 15
RECT CAP2 16
C51
1/50
C49
1/50
C50
1/50
C38
10/16
C42
100p
R48
22k
C44
0.0027
C40
0.0027
R57
22k
R53
22k
R56
47k
R50
47k
R41
3.3k
R46
22k
C37
10/16
C34
0.68T
R21
10k
C16
0.0027
R20
10k
R19
10k
C13
150p
C15
0.0012
R16
4.7k
C14
0.68T
C7
100p
C9
0.0027
R15 47k
R12
22k
R17
2.2k
C11
47/16
C10
10/16
RH03ADCS4X (47kB)
RT2
1
2
3
VR2
RK0971110-50kB
1
2
3
VR1
RK0971110-50kB
1
2
3
VR3
RK0971110-10kA
1
2
3
SW1A
SRBM14011
12
13
14 11
15
SW1B
21
22
23 25
24
R65
10k
JK4
HEC0470-01-630
2
1
3
C22
22p
JK2
HTJ-064-14D
1
2
3
R64
10k
JK1
HTJ-064-13D
1
2
3
+
-
IC8C
uPC4072G2
84
IC10A
NJM319M
4
5
12
3
R68
33k
R69
2.2k
IC10B
NJM319M
9
10
7
8
IC10C
NJM319M
116
C52
0.1
+
-
IC8A
uPC4072G2
2
3
1
Q4
2SC3324GR
1
2 3
Q3
2SC3324GR
1
2 3
Q8
2SC3324GR
1
2 3
Q5
2SC3324GR
1
2 3
Q9
2SC3324GR
1
2 3
Q7
2SC3324GR
1
2 3
Q10
2SK879Y
3
12
Q6
2SK880GR
3
1 2
Q11
2SK880GR
3
1 2
Q1
2SC3324GR
1
2 3
D1
1SS355
12
R30
150
R31
220
D4
1SS355
12
D7
1SS355
12
+
-
IC5
NJM311M
3
2
7
1
84 6 5
D6
1SS355
12
D8
1SS355
12
IC4C
TC74HC00AF
9
10
8
C24
47/16
D5
1SS355
1 2
RA1
RKM14L472-942F
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D3
1SS355
12
R26
1k
R67
33k
Q2
2SK879Y
3
12
C5
0.047
D2
1SS355
12
R5
10k
R22
10k
R18
10k
C12
0.0068
IC7
MN51010RBA
SERIALI 30
D11 45
D10 44
D9 43
D8 42
D7 41
D6 40
D5 39
D4 38
D3 37
D2 36
D1 35
D0 34
NORMSH 28
XI 84
VCOOUT 83
CVIN1 82
CVIN2 81
FETSW 25
MUTE 59
TIME4 63
TIME6 65
HOLD 26
EFSW 23
GND
31
TIME10
69
TIME11
70
GND
75
VDD 73 VDD 33
RESET
76
DQ4
7
DQ3
5
DQ2
10
DQ1
9
A7
17
A6
14
A5
15
A4
16
A3
18
A2
19
A1
20
A0
21
NRAS
12
CAS1
6
NWE
11
NOE
8
C56
47/16
R70
22
C55
0.1
R71
33k
R66
560
D10
RD5.6S B3
12
R2
1k
JK3
HTJ-064-14I
1
2
4
IC4E
TC74HC00AF
147
RA4
CRN34103J
1 8
2 7
3 6
4 5
R29 470
C54
0.1
C53
0.1 IC11
M11B416256A-35J
VCC
1
DQ1
2DQ2
3DQ3
4DQ4
5
VCC
6
DQ5
7DQ6
8DQ7
9DQ8
10
NC 11
NC 12
WE 13
RAS 14
NC 15
A0 16
A1 17
A2 18
A3 19
VCC
20
VSS
21
A4 22
A5 23
A6 24
A7 25
A8 26
OE 27
UCAS 28
LCAS 29
NC 30
DQ9
31 DQ10
32 DQ11
33 DQ12
34
VSS
35
DQ13
36 DQ14
37 DQ15
38 DQ16
39
VSS
40
C18
0.01
RA3
CRN34103J
1 8
2 7
3 6
4 5
RA2
CRN34103J
1 8
2 7
3 6
4 5