Apr, 1998 SPD-20

TABLE OF CONTENTS PageSPECIFICATIONS•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••1LOCATION OF CONTROLS ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••1EXPLODED VIEW•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••2PARTS LIST ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••3PANEL BOARD ASS'Y •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••4VOLUME BOARD ASS'Y ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••4MAIN BOARD ASS'Y •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••4CIRCUIT DIAGRAM •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••5~7BLOCK DIAGRAM ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••8LOADING THE FACTORY PRESET DATA ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••8DATA SAVE AND LOAD •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••8INDENTIFYING THE VERSION NUMBER•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••9CHECKING BATTERY VOLTAGE••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••9TEST MODE ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••10ERROR MASSAGES••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••13HOW TO EXCHANGE THE SENSOR ASSY ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••13ADJUSTMENT •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••14IC DATA••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••15

Printed in Japan (ACE0) (CR) 117059918

Issued by RJA

Copyright c 1998 by ROLAND CORPORATIONAll rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.

SPECIFICATIONS

Top Case Assy

(71120090)

AC IN 1C IN 12V FOOFOOT SWT SW MIDI INMIDI IN 321TRIGGER INPUTTRIGGER INPUT

HHHH R PHONESPHONES VOLUMEOLUME

INST

LEVEL

PITCH

DECAY

PAN

CURVE

FX SENDFX SEND

L(MONOMONO)HH CTHH CTRLRLMIDI OUTMIDI OUT

TX CHTX CH

NOTE

GT TIMEGT TIME

CURVE

SENS

PGM CHG PGM CHG

PAN

/TRIG 4RIG 4TRIG 4TRIG 4

CTCTRLRL

BASIC CHASIC CH

BULK DUMPBULK DUMP

PATCH EXPTCH EXPAND

TRIG SENSTRIG SENS

TRIG TTRIG TYPE

TRIG THRESHOLDTRIG THRESHOLD

PDL CCPDL CC

FX TFX TYPE

FX TIMEFX TIME

FX LEVELFX LEVEL

PDL CTRLPDL CTRL

PDL LEVELPDL LEVEL

TRIG CURTRIG CURVE

POWER

Display Cover

(01453878)7-SEG LED

LB-603VP (Red)

(15029567)

LED

SEL6410E-TP5(Green)

(00019523)

LED

SEL6210S-TP5(Red)LED(15039245)LNJ802RPDJA (Red)

(01560689)Rubber Switch

(01453901)

Switch

EVQ21304M

(13169761)

A

B

Rev

Cho Fln

Dly

PAD BANK EFFECTSSOUND MIDI FX/PEDAL SYSTEM SELECT PATCH CHAIN COPY EDIT

BANK A/B

PATCH/VALUE

LAYER FX ON/OFF

ALL/ENTER

Jack (AC Adapter)

HEC0740-01-010

Power Switch

(13449728)

SPUN19430A

(13129369)

Key Top (Black)

(12499175)

Jack (Stereo)

YKB21-5006

(13449252)

DIN Socket

TCS5350-01-4151

(13429615)

Cord Hook

(22365708)

Slide Switch

SSSU14

(13159169)

Jack (Monaural)

HLJ7101-01-3010

(13449283)

Jack (Stereo)

HLJ7001-01-3010

(13449284)

Volume Knob

(22485109)

Rotary Volume

RK09L12B0 10KBX2

(13289228)

Bottom Case Assy

(71120101)Rear Panel

(01453889)

USE BOSS BRAADAPTOR ONLY

POWER

ON/ OFF

500mAAC IN 12V

FOOT SWINOUT

MIN

MIDI

MAX

TRIGGER INPUT

123/TRIG 4HH CTRL

CTRLPHONESVOLUME L(MONO)R

OUTPUTTRIG 4

HH

LOCATION OF CONTROLS

SPD-20total percussion pad

SPD-20 :TOTAL PERCUSSION PAD

PADSBuilt-in Pads : 8External Pads(Option) : 3 (4)

Maximum Polyphony14 Voices

Instruments700 Voices

MemoryPatches : 99Patch Chain : 8

EffectReverbDelayChorusFranger

Display

7-segment LED x3

ConnectorsOutput Jacks (L[Mono], R)

Phone Jack (Stereo)Trigger Input Jacks (Dual):3

HH CTRL/TRIG 4 Jack (Dual)

MIDI Connectors (IN, OUT)Foot SW Jack(Dual)

*Trigger inputs 1 and 2 accept rim shots from the PD-7,PD-9 and PD-120 while inputs3 and 4 accept rim shots from the PD-7 and PD-9.

Power SupplyAC 12V:AC Adaptor

Current Draw420mA

Dimensions17-3/4(W) x 13-13/16(D) x 2-13/16(H) inches

Weight2.8 Kg / 6 lbs 3 oz(excepting AC adaptor)

AccessoriesOwner's Manual

ENGLISH :(# 71121112)JAPANESE :(# 71120089)

AC Adaptor (BOSS BRA Series)100V :(# 12449621)117V :(# 12449622)230V :(# 01341356)240V :(# 12449625)

Slit Tape :(#01564589)

Options :Pads (PD-120, PD-100, PD-9, PD-7, PD-5)

Kick Trigger Unit (KD-7)

Hi-Hat Control Pedal (FD-7)

Footswitch (BOSS FS-5U)Footswitch Cable (BOSS PCS-31)

Pedal Switch (DP-2/6)All-purpose Clamp Set (APC-33)

*In the interest of product improvement, the specifications and/or appearance of thisunit are subject to change without prior notice.

2

Apr, 1998SPD-20

1

2

3

4

3X10mm Binding HeadP-tight Ni

3X10mm Binding HeadP-tight BZC x1

4X12mm Binding Head P-tight Ni x15

M5X12mm Hex SocketBolt BZC x4

3X8mm Pan Head B-tight ZCwith Flat Washer x5

HeadB-tight

3X10mm Binding HeadP-tight Ni x4

3X8mm Binding headP-tight BZC x8

3X6mm

B-tight

ZC withFlat Washer

3X8mm Pan

x6

x3

5 6

7

9

11

13

14

15

16

17

16

18

8

10

Binding Head

ZC x4

3X10mm Binding HeadP-tight Ni

20

21

19

12

EXPLODED VIEW

q 22355152 Rubber Foot x 4w 22365708 Cord Hooke 71120101 Bottom Case Assy

NOTE :Replacement Bottom Case Assy includes the following parts.

q Rubber Footw Cord Hookr Rear Panel

r 01453889 Rear Panelt 12499175 Key Top (Black)y 22485109 HP-5600 Knobu 22255385 Shield Sheeti 22265595 Shield Cushiono 22205874 Rear Holder!0 71120156 Main Board Assy!1 12199573 PCB Holder x 2!2 01560656 FUJI CARD

30 x 190 x A6.0 BB-P1.25-HBL15-S

!3 71120145 Panel Board Assy!4 01455789 Sensor Flexible x 2!5 25295208 ø27 Sensor Tape ø18 x 8!6 71120090 Top Case Assy

Note: Replacement Top Case Assy consists of the following 5parts. We don't supply Top Case, Playing Plate andCushion separatery.

******** Top Case******** Playing Plate******** Cushion

!7 01453878 Display Cover!8 01453901 Rubber Switch!9 12449471 Ferrite Core@0 40016545 Tie Holder SKM-1@1 40016512 Insulok Tie T-18S(80mm)

PARTS LIST

SAFETY PRECAUTIONS:*2

The parts marked have

safety-related characteristics.

Use only listed parts for

replacement.

!

CONSIDERATIONS ON PARTS ORDERING

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-15DFailure to completely fill the above items with correct number and description will result in delayed or even undelivered replacement.

TRANSISTOR

15319101 2SC2412KR T146 NPN Q23 to 27,29 to36, 38 to 42 on MB15309101 2SA1037KR PNP Q1,2,28 on MB15329507 DTA114EK T146 D-TR Q9 to 22 on MB15329514 DTC343TK T146 D-TR Q3,6,7,8 on MB15329105 2SK208Y TE85L N-ch FET Q4,5 on MB15329516 DTC114EK T146 PNP Q301,302,303 on PB15309605 2SB1184R F5 TR D-TR Q37 on MB

DIODE

15339138 DCC010-TB DA1,3,5,6,7,9 to 22 on MB15339139 DCF010-TL DA4,8 on MB15339140 DCG010-TL DA2 on MB15339141 DSD010-TB D1,2,3,7 to 10,13,14 on MB D319 to 330 on PB15039169 DSK10C-ET1 D4,5,11,12 on MB00237712 RD5.6M-T1B B3 D6 on MB

# 01561301 1GWJ42 TPB2 D15 on MB# 01560689 LNJ802RPDJA LED(red)

15039245 SEL6210S TP5 LED(red)00019523 SEL6410E TP5 LED(gleen)

RESISTOR

15399953 1W MCR100-220J 1W22Ω R12,34 on MB15399931 MNR34J5ABJ221 R-ARRAY RA7,8 on MB15399932 MNR34J5ABJ101 R-ARRAY RA1 to 5 on MB15399965 RCE9A103JAG7A R-ARRAY R6 on MB

POTENTIOMETER

13289228 RK09L12B0 10KB *2 Rotary Volume VR401

CAPACITOR

00674423 ECA0JM102B 1000uF/6.3V C15113639698 ECEA0JKS101B 100uF/16V C3,4,6,7,29 to 33,42,68,72,102,110,115,121,130,14013639150M0 ECEA0CKS100B 10uF/16V C1,2,4,5,25,26,27,28,12813669261M0 ECEA1HKS010B 1uF/50V C98,14313649710 25MV470HC+T 470uF/25V C119,13913549260M0 ECQ-B1H272JF3 2700pF/50V C15,1613549284 ECQ-B1H561JF3 560pF/50V C17,1813559360 ECQ-B1181JF3 180pF/100V C13,14

POTENTIOMETER,TRIMMER

13299206 ENVD8AA03B24 VR1 on MB01013556 RK09L1140 10KB VR4-7,14-17 on PB

# 01342545 RK09L1140 10KB with click VE3,13 on PB01013545 RK09K12D0 10KBX2 VR1,2 on PB

# 01343301 RS25111A6 10KB L=15 25mm slide VR9-12 on PB# 01343312 RS25111C6 10KB L=15 25mm clicked VR8 on PB# 01342134 EWA NKE C10 B14 30mm slide VR18-25 on PB

CAPACITOR

00236545 AMZV0050J224 0200 C120,127 on MB00239601 AMZV0050J104 0200 C117,121,124,203,328,C333,335 on MB

# 00239434 AMZV0050J182 0200 C128,144,152,160,170,C330 on MB00239490 AMZV0050J103 0200 C7 on PB00236301 AMZV0050J222 0200 C123,135,147,156,165,C174 on MB

# 00239534 AMZV0050J223 0200 C122,129 on MB# 00239578 AMZV0050J473 0200 C118,125,205 on MB

00236378 AMZV0050J822 0200 C202 on MB

INDUCTOR, COIL, FILTER

12449396 BLM31A601SPT L3 on MB00907856 BLM21A601SPT L1,2,4 to 2800342556 ELC08D054 L29 on MB12449471 SSC-45-8-F Ferrite Core

CRYSTAL, RESONATOR

00894023 MA-406 20.000MHz X2 on MB# 01453945 SG8002DC 23.2MHz X1 on MB

CONNECTOR

13429281 SLEM30R-2 CN2 on MB, CN301 on PB# 01560678 SLD5R-1 CN3, 4 on MB

13369929 53253-0710 CN401 on VB

WIRING, CABLE

23505664 Wiring Harness A CN1 on MB# 01560656 FUJI CARD 30*190-A6.0 BB-P1.25-HBL15-S FlatCable(30P)

BATTERY

12569249S0 CR2032 220MAH 30M BT1 on MB

SENSOR

# 71120112 SENSOR ASSYNOTE: Replacement Sensor Assy consists of the following 2 parts.

# ******** SPD-20 Sensor Flexible25295208 ø27 Sesor Tape ø18(*4)

SCREWS

40011245 4*12mm Binding Head P-tight NI40011234 3*10mm Binding Head P-tight NI40011312 3*8mm Binding Head P-tight BZC40011034 3*8mm Pan Head B-tight ZC with Flat Washer40011056 3*6mm Binding Head B-tight ZC40011323 3*10mm Binding Head P-tight BZC40019190 M5*12mm Hex Socket Bolt BZC40016601 Nylon Ribet NRP-355

PACKING CASE

# 01453890 PACKING CASE22645349 PAD L22645350 PAD R

MISCELLANEOUS

12569420 Litium Battery Holder for CR203213429281 Connector SLEM30R-2 Flat Cable Holder(30P)12199573 PCB Holder KGLS-8S22255385 Shield Sheet22175352 Leaf Spring40016512 Inshlok Tie T18S 80mm40016545 Tie Holder SKM-122265595 Shield Cushion

ACCESSORIES(STANDARD)

12449621 BRA-100 AC Adaptor(100V)12449622 BRA-120 AC Adaptor(120V)01341356 BRA-230 AC Adaptor(230V)12449625 BRA-240A AC Adaptor(240V)

# 71121112 Owner's Manual English# 71120089 Owner's Manual Japanese# 01564589 Slit Tape Adhesive Tape White W3MM

3

NOTE1:The parts marked # are new.(initial parts)NOTE2:The parts marked ! have safety-related characteristics.

Use only listed parts for replacement

MB / MAIN BOARD ASSYPB / PANEL BOARD ASSYVB / VOLUME BOARD ASSY

CASING

# 71120090 Top Case AssyNote: Replacement Top Case Assy consists of the following 5 parts.

We don't supply Top Case, Playing Plate and Cushion separately.

******** Top Case******** Playing Plate******** Cushion

# 01453878 Display Cover# 01453901 Rubber Switch

# 71120101 Bottom Case AssyNote: Replacement Bottom Case Assy consists of the following 6 parts.

******** Bottom Case# 01453889 Rear Panel

22355152 Foot22365708 PAD-80 Cord Hook40011323 3*10mm Binding Head P-tight BZC40019190 M5*12mm Hex Socket Bolt BZC

CHASSIS

22205874 Rear Holder

KNOB, BUTTON

# 01453901 Rubber Switch12499175 Key Top for SDDWA(Black)22485109 HP-5600 knob

SWITCH

13129369 SPUN19430A Power Switch SW2 on MB13159169 SSSU14 Slide Switch SW1 on MB13169761 EVQ21304M Tact Switch SW301 to 312

JACK, SOCKET

13429543 100-032-001 IC Socket 32P IC10 on MB13449284 HLJ7001-01-3010 Jack(Stereo) JK401 on VB13449283 HLJ7101-01-3010 Jack(Monoral) JK1,2 on MB13449252 YKB21-5006 Jack(Stereo) JK3 to 6, 9 on MB13449728 HEC0740-01-010 AC Adaptor Jack JK10 on MB13429615 TCS5350-01-4151 MIDI Conector JK7,8 on MB

DISPLAY UNIT

15029567 LB 603VP 7-seg LED D301 on PB

PCB ASSY

#‰ 71120156 Main Board Assy

NOTE1: Replacement Main Board Assy includes the Rear Holder.

NOTE2: Replacement Main Board Assy does not include the Litium Battery.Because Litium Battery does not use for the back-up of factory presets.

12569249S0 Litium Battery CR2032

# 71120167 Volume Board Assy

# 71120145 Panel Board Assy

IC

15199776 h8/510 HD6415108F10 CPU IC12 on MB00781723 M27C2001-10F1 2M EPROM(BLANK) IC10 on MB17048914 M27C2001-10F1 2M EPROM(PROGRAMMED) IC10 on MB15239229 TC6116AF(GP4) Custom IC IC6 on MB

# 01562756 LHMNOPW2 64M MASK ROM(for Sound) IC1 on MB01122412 TC551001B(C)-70L SRAM IC8 on MB01125112 TC55257DFL-70L(EL) SRAM IC3 on MB15289125 PC410 Photo-Coupler IC17 on MB15289709 M51954BFP SOP Reset IC IC22 on MB15289714 uPD63200GS D/A Converter IC7 on MB115189261 M5218AFP Op. amp IC4,18,21,23,24,26,29,30 on MB15289106 M5238FP Op. amp IC19 on MB15289109 M5216FP Op. amp IC5 on MB15259883 TC7S00F TE85L Single 2-input NAND Gate IC9 on MB15249104 TC7S04F TE85L Single Inverter IC11,20 on MB15249121 TC7W04F TE12L IC14 on MB, IC301 on PB15259738T0 TC74HC138AF(EL) 3 to 8 Demultiplexer IC302 on PB15259740T0 TC74HC139AF(EL) Dual 2 to 4 Demultiplexers IC303 on PB15259864T0 TC74HC4052F-T2 Dual 4-channel Analog Multiplexer IC15,16 on MB15259711T0 TC74HC14F-T2 Hex Schmitt Trigger Inverters IC13 on MB

# 15259742T0 TC74HC148AF(EL) 8 to 3 Priority Encoder IC2 on MB15199291 BA9700A Switching Regulater IC28 on MB15199231 uPC78L05J-T Regulater IC27 on MB15199233 uPC79L05J-T Regulater IC25 on MB

SPD-20Apr, 1998

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U4

Apr, 1998SPD-20

CIRCUIT BOARD

For Nordic Countries

Apparatus containingLithium batteries

ADVARSEL!Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.Udskiftning må kun ske med batteri afsamme fabrikat og type.Levér det brugte batteri tilbage til leverandøren.

CAUTION!Danger of explosion if battery is incorrectly replaced.Replace only with the same or equivalent type recommended by manufacture.Discard used batteries according to the manufacturer's instructions.

ADVARSEL!Lithiumbatteri - Eksplosjonsfare.Ved utskifting benyttes kun batteri somanbefalt av apparatfabrikanten.Brukt batteri returneres apparatleverandøren.

VARNING!Explosionsfara vid felaktigt batteribyte.Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren.Kassera använt batteri enligt fabrikantens instruktion.

VAROITUS!Paristo voi räjähtää, jos se onvirheellisesti asennettu.Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

VOLUME BOARD ASS'YASSY 71120167

MAIN BOARD ASS'YASSY 71120156

PANEL BOARD ASS'YASSY 71120145

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U5

L/MONO

R

to CN 401

From BRAAC 12V

NIU

VOLUME BOARD

SIDATA

BCLKLRCK

Lch_OUTRch_OUTRch_RETURNLch_RETURN

PHONES_LPHONES_R

XRESET

PHONES_RPHONES_L

Rch_OUTRch_RETURNLch_RETURNLch_OUT

+5D

D A A A

D

+5A

A

A A A

+5A

-A 5

A A A

+5A

-A 5

+5A

-A 5

A

A

A

A

AAA

A

A

AAA

+5A

-A 5

A

A

A

AA

A

AA

+5A

-A 5

A

- 5D

A A A

A

+5D

DD

D

D

D

D

A

-A 5

A

+5A

-A 5

AD

D

IC7UPD63200GS

DV

DD

4

AV

DD

7A

VD

D8

LR/WDCK13

CLK16

SI/LSI15

18/163 4/8FS1 LRS/RSI

14

LOUT11

ROUT6

RREF9LREF10

DG

ND

2

AG

ND

5A

GN

D12

C390.1

C380.1

R18

10k

R16

10k

R14

10k

R2256k

R5390

Q22SA1037K R

1

3 2

Q52SK208Y

3

12

R17

10k

R15

10k

R13

10k

R2156k

R4390

Q12SA1037KR

1

3 2

Q42SK208Y

3

12

C210/16

C110/16

C25

10/16

C26

10/16

C37100/6.3

C33100/6.3

C29100/6.3

R311k

IC4CM5218AFP

+

-

84

C14

0.1

C15

0.1

R3010k

R2927k

C2447p

C27

10/16

R25

1k

R3256k

IC4BM5218AFP

+

-6

57

Q8DTC343T K

12

3

L2BLM21A601S

JK2

HLJ7101-01-3010

1

24

R61k

R1110k

R1027k

C947p

C4

10/16

R1

1k

R256k

IC4AM5218AFP

+

-2

31

Q3DTC343T K

1

23

L1BLM21A601S

JK1

HLJ7101-01-3010

1

24

R201k

R275.6k R26 27k

R3356k

C21 47p

Q7DTC343T K

1

23 IC5B

M5216FP+

-6

57

IC5CM5216FP

+

-

84

C16

0.1

C17

0.1

R91k

R85.6k R7 27k

R356k

C7 47p

Q6DTC343T K

1

23 IC5A

M5216FP+

-2

31

JK10

HEC0740-010010

213

L29

ELC08D054

D151GWJ42

12

D11DSK10C

1 2

D12DSK10C

12

C139470/25

C132470/25

C142470/25

C1340.1

C1240.1

C1350.1

C1200.1

C121100/6.3

C115100/6.3

IC27UPC78L05J

IN3

OUT1

CO

M2

IC25UPC79L05J

IN2

OUT3

CO

M1

Q282SA1037K R

1

32

Q27

2SC2412KR

1

23

Q252SC2412KR

1

23

R13147k

R147

10k

R122100k

R154560

R14647k

C12810/16

R13610k

R19833k

R183560

R179560

C151 1000/6.3

R156 22k

R15522k

R161 15k

C148

680p

C143 1/50

C136 1000p

C149

0.047

R192 6.8k

IC28BA9700A

DTC1

RT2

CT3

FB4

OUT5

NC6

GND7

VCC8NC9SW10

VREF11-IN121/2VREF13+IN14

R193

15k

R196

10k

R191

47k

C231000p

C31000p

C510/16

C2810/16

R341W22

R121W22

D5DSK10C

12

D4DSK10C

12

CN1

SPD-11 Wiring Harness A

11 22 33 44 55 66 77

SW2A

SPUN19-2N-W

121113

C20

560p

C19560p

C122700p

C13

2700p

C11

180p

C10180p

SW2BSPUN19-2N-W

222123

C131

Q37

2SB1184RF5

1

23C32

100/6.3

C31

100/6.3

D6RD5.6M

13

C40 0.1

CIRCUIT DIAGRAM

SPD-20Apr, 1998

4M MASK :JUMPER2M EPROM : R45

64M MASK ROM

GP_4

H8/510

NIU

MIDI IN

MIDI OUT

to C

N 3

01

PA

NE

L B

OA

RD

AS

SY

FOOT SW

(SPD-20 WAVE)

WA22WA21WA20

MIDI OUT

D0D1D2D3

D5D6D7

D0D1D2D3D4D5D6D7

D4

D[0..7]

XWAIT

XRD

D7D6D5D4D3D2D1D0

WA19

WA8

WA16

WA8

WA19

WA15

WA13

WA0

WA10

WA4

WA1

XWCS1

WA17

WA5

WA14

WA9

WA12

WA18

WA2

WA2

XWCS2

WA11

WA9

WA18

WA17

WA4

XWCS3

WA1

WA14

XWCS0

WA12

WA7

WA5

WA16

WA7

WA10

WA13

WA3

WA0

WA11

WA6

WA3

WA15

WA6

D0D1D2D3D4D5D6D7

EA14EA13

EA11EA10EA9EA8

EA6EA5EA4EA3EA2EA1EA0

EA7

EA12

ED7ED6ED5ED4ED3ED2ED1ED0

ED[0..7]

ED7ED6ED5ED4ED3ED2ED1ED0

XEWRXECS

WA[0..22]

WA20

XWCS3XWCS2XWCS1XWCS0

XWCS[0..3]

WA22WA21

XWCS

XWR

D0D1D2D3D4D5D6D7

XWCS3

A5

A10

A1

A14

A14

A4

A14

A2

A7A3

A10A12A11

A4A3

A9

A9

A2

A9

A13

A12

A4

A20

A7

A8

A11

A[0..21]

A15

A8

A1

A0

A0

A16

A15

A0

A6

A6

A2

A0

A4

A8

A21

A5

A1

A13

A15

A11

A16

A5

A1

A13

A2

A7

A5

A10

A6

A12

A3

A19

A3

A17

A16A17A19A20

A21

WD1

WD4

WD1

WD5

WD2

WD4WD3

WD0

WD6

WD0

WD[0..7]

WD6

WD5

WD7

WD7

WD2WD3

MIDI IN

AN0AN1AN2AN3

HH_INIT

HH/TRG4_SWSCAN_SW

RIM1RIM2RIM3RIM4

SCAN_ASCAN_B

XRESET

XRESET

SIDATABCLK

LRCK

XRESET

XRESET

+5D

DD

+5D

+5D

D

D

+5D

D

+5D

A

+5A

D

D

D

D

+5D

+5D

+5D

D

D

+5D

+5D

D

D

BAT

D

D

BAT

BAT

D

+5D

D

D

+5D

D

D

+5D

D

+5D

D

D

+5D

D

+5D

D

+5D

D

D

+5D

A

D

D

D

D

+5D

+5D

+5D

+5D

+5D

D

D

+5D

D

D

DD

+5D

+5D

D

+5D

D

+5D

+5D

+5D

A

D

+5D

+5D+5D

D

+5D

D

D

D

A

A

A

D

+5D

IC1

LHMN0PW2

A2044

A1943

A182

A173

A1634

A1535

A1436

A1337

A1238

A1139

A1040

A941

A842

A74

A65

A56

A47

A38

A29

A110

A011

*/D1531

BYTE33

CE12

OE14

D1429

D1327

D1225

D1122

D1020

D918

D816

D730

D628

D526

D424

D321

D219

D117

D015

A211

VCC23

VSS13

VSS32

C6100/6.3

C80.1

IC3

TC55257DFL-70L

A141

A1326

A122

A1123

A1021

A924

A825

A73

A64

A55

A46

A37

A28

A19

A010

CE20

WE27

OE22

I/O719

I/O618

I/O51716

I/O4I/O3

15

I/O213

I/O112

I/O011

VCC28

VSS14

JK8TCS5350-01-415 1

1425

3

123 45 9 10

JK7TCS5350-01-415 1

1425

3

123 45 9 10

L15BLM21A601S

L16BLM21A601S

L13BLM21A601S

L14BLM21A601S

R97100

R107120

R80220

R87220

C910.1 D1

DSD010

23

Q22DTA114EK

1

32

IC14A

TC7W04F

17

IC14BTC7W04F

35

IC14C

TC7W04F

62

C750.1

CN2

SLEM30R-2

112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030

RA7220x4

18273645

Q21DTA114EK

1

32

Q19DTA114EK

1

32

Q17DTA114EK

1

32

Q18DTA114EK

1

32

Q15DTA114EK

1

32

R20310

Q20DTA114EK

1

32

Q13DTA114EK

1

32

Q14DTA114EK

1

32

Q9DTA114EK

1

32

Q11DTA114EK

1

32

Q12DTA114EK

1

32

R68220

R66220

R64220

R62220

R59220

RA8220x4

18273645

Q16DTA114EK

1

32

C72100/6.3

C590.1

X2MA-406@20.0MHz

14R76

1M

IC22M51954BFP

RS

T6

DLY5

VCC7

GND4

NC1

NC2

NC3

NC8

R84100

R79100

R7110k

C690.1

C68100/6.3

IC10

M27C2001-10F1

A1831

A1730

A162

A153

A1429

A1328

A124

A1125

A1023

A926

A827

A75

A66

A57

A48

A39

A210

A111

A012

CE22

OE24

D721

D620

D519

D418

D317

D215

D114

D013

VPP1

VCC32

VSS16

C42100/6.3

C43

0.1

JUMPER

R4510k

R4710k

RA5 100x4

1 82 73 64 5

RA4 100x4

1 82 73 64 5

RA1 100x4

1 82 73 64 5

RA2 100x4

1 82 73 64 5

RA3 100x4

1 82 73 64 5

IC9TC7S00F

1

24

53

C490.1

IC8

TC551001B(C)FL-70 L

A162

A1531

A143

A1328

A124

A1125

A1023

A926

A827

A75

A66

A57

A48

A39

A210

A111

A012

CS230

CS122

WE29

OE24

I/O821

I/O720

I/O619

I/O518

I/O417

I/O315

I/O214

I/O113

NC1

VDD32

VSS16

IC12

HD6415108F

49

112

111110109

9695

9493

8079787776757473

7271706968676665

86858483

87

82

92

91

9089

5453525150

98

99

2

6362616059585756

4544434241403938

36353433323130292827262524232221

1918171615141312

1110987654

107

104

105106

103

1

48

47

102101

55 88108

3 20 37 46 64 81 97 100

C47100/6.3

C460.1

IC11TC7S04F

2 4

53

C500.1

C34100/6.3

C350.1

R3910k

R38

10k

R4010k

X1

23.2MHzSG-8002

OE1

GND4

OUT5

VDD8

C30100/6.3

C220.1

IC2TC74HC148AP

74

63

52

41

313

212

111

010

EI5

A26

A17

A09

EO15

GS14

VC

C16

GN

D8

C180.1

R57 10k

R56 10k

R53 10k

R52 10k

L17BLM21A601S

L18BLM21A601S

R8247k

R7847k

DA10DCC010

2 1

3

DA7DCC010

2 1

3

R831k

R751k

C74100p

C67100p

C730.1

L3BLM32A601S

C410.1

C981/50

R1024.7k

IC20TC7S04F

2 4

53

C880.1

RA6

RCE9A@JA10kx8

123456789

L4BLM21A601S

R4610k

R37 1k

R36 1k

R35 1k

R19 10k

IC14DTC7W04F

84

R50100

JK9

YKB21-5006

1

23

45

78

Q10DTA114EK

1

32

R61220

R55

10k

R54

10k

R58

10k

R60

10k

R6310k

R67

10k

R512.2k

IC6

TC6116AF

18 54 90126

19 55 91 104

12714

2

114113112

66676968707174737680

757779818486

8587899395949288

99100787297

102107115111110109108101

116988283

1181175296

535657

6564636261605958

103105

464748495051

106

13413513713613813914114047214414313568911

1012141620171513

133132131130129128125124

454243363338404139373534323028

2927252321222426

4431

119121120122123

R24 10kR23 10k

R28 10k

R4910k

R854.7k

C6610p

C6510p

DA4DCF010

12

3

DA8DCF010

12

3

C129470/25

C1051000p

C1191000p

IC17PC410

64

1

35

C970.1

R882.2k

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U6

SPD-20 Apr, 1998

TRG1

TRG2

TRG3

TRG4/HH_CTRL

to S

EN

SO

R A

SS

Yto

SE

NS

OR

AS

SY

INTP4

INTP7

INTP5

INTP6INTP3

INTP1INTP8

INTP2

PAD7

PAD2

PAD6

PAD2

PAD8

PAD3

PAD5

PAD6

PAD5PAD4

PAD7

PAD4

PAD1

PAD8

PAD3

PAD1

INTP1INTP2INTP3INTP4

INTP5INTP6INTP7INTP8

INTP[1..8]

PAD[1..8]

HH_INIT

RIM1RIM2RIM3RIM4

AN0

SCAN_A

AN1

AN3

SCAN_B

AN2

HH/TRG4_SW

SCAN_SW

A A

+5D

A A

A A

A A

+5D

A AA

A AA

A AA

A AA

A AA

A AA

A AA

A AA

D

+5D

D

+5D

D

+5D

D

B AT

D

+5A

A

+5D

A

AA

+5D

A

+5D

A

A

A

DD

A

A

A

D

A

A

A

A

A

D

+5D

A

A

D

+5D

A

A

+5D

+5D

A

D

+5D

- 5D

- 5D

D

A

A

A

A

A

A

+5A

A

+5A

A

A

A

+5D

D

D

D

+5D

D

D

+5A

A

A

-A 5

+5A

A

A

-A 5

+5A

A

A

A

A

+5A

-A 5 -A 5

A

A

+5A

A -A 5

+5A

A A

+5A

-A 5A

-A 5

D

D

+5A

-A 5-A 5

A

+5A

-A 5

A

A A

A

A

A

A

A

A

A

-A 5

L12 BLM21A601S

C56100p

C60100p

L11 BLM21A601S

R771k

R81100k

IC13ATC74HC14AF

1 2

L10 BLM21A601S

C53100p

C54100p

L9 BLM21A601S

L8 BLM21A601S

C51100p

C52100p

L7 BLM21A601S

L6BLM21A601S

C45100p

C48100p

L5BLM21A601S

Q33

2SC2412KR

1

2 3

Q30

2SC2412KR

1

2 3

R159

27k

R160

18k

R167

27k

R170

5.6k

R163

1k

R169

5.6k

D8DSD010

2 3

L21

BLM21A601S

R1764.7k

Q35

2SC2412KR

1

2 3

Q31

2SC2412KR

1

2 3

R158

27k

R157

18k

R162

27k

R175

5.6k

R166

1k

R168

5.6k

D7DSD010

2 3

L20

BLM21A601S

R180

4.7k

Q41

2SC2412KR

1

2 3

Q40

2SC2412KR

1

2 3

R201

27k

R202

18k

R206

27k

R211

5.6k

R205

1k

R210

5.6k

D14DSD010

2 3

L28

BLM21A601S

R213

4.7k

Q42

2SC2412KR

1

2 3

Q39

2SC2412KR

1

2 3

R200

27k

R199

18k

R204

27k

R208

5.6k

R2071k

R209

5.6k

D13DSD010

2 3

L25

BLM21A601S

R212

4.7k

Q26

2SC2412KR

12 3

Q24

2SC2412KR

1

2 3

R124

27k

R125

18k

R135

27k

R145

5.6k

R1301k

R144

5.6k

D2DSD010

2 3

L22

BLM21A601S

R150

4.7k

Q29

2SC2412KR

1

2 3

Q23

2SC2412KR

1

2 3

R129

27k

R128

18k

R134

27k

R143

5.6k

R139

1k

R140

5.6k

D3DSD010

2 3

L23

BLM21A601S

R1494.7k

Q36

2SC2412KR

1

2 3

Q32

2SC2412KR

1

2 3

R173

27k

R174

18k

R182

27k

R190

5.6k

R178

1k

R189

5.6k

D10DSD010

2 3

L27

BLM21A601S

R197

4.7k

Q38

2SC2412KR

1

2 3

Q34

2SC2412KR

1

2 3

R172

27k

R171

18k

R177

27k

R188

5.6k

R181

1k

R186

5.6k

D9DSD010

2 3

L26

BLM21A601S

R195

4.7k

C640.047

R731k

R74100k

IC13FTC74HC14AF

13 12

C610.047

R701k

R72100k

IC13ETC74HC14AF

11 10

C570.047

R651k

R69100k

IC13DTC74HC14AF

9 8

C550.047

DA22DCC010

2 1

3

R11522k

R123

68k

R119390k

C118

0.01

C123

0.22

R127

120k

R126

68k

DA21DCC010

2 1

3

C116

0.01

C111 22p

R132

120k

C122

0.22

R110

68k

DA18DCC010

2 1

3

R106390k

R10322k

C101

0.01

R109

120k

C104

0.22

R96

68k

DA14DCC010

2 1

3 R92390k

R9122k

C86

0.01

R99

120k

C90

0.22

R95

68k

DA13DCC010

2 1

3 R94390k

R9322k

C84

0.01

C82 22p

R98

120k

C89

0.22

DA12DCC010

21

3

BT1CR2032

12

R4810k

R901M

C96 22p

R108

68k

R111

120k

DA17DCC010

2 1

3

C103

0.22

C99

0.01

R116100k

JK5

YKB21-5006

1

23

45

78

R164180

R153100k

JK3

YKB21-5006

1

23

45

78

R152100k

IC23BM5218AFP

+

-6

57

R184100k

IC26AM5218AFP

+

-2

31

C1270.22

DA3DCC010

2 1

3

IC26BM5218AFP

+

-6

57 R121

180

C870.1

IC30AM5218AFP

+

-2

31

R10422k

IC18BM5218AFP

+

-6

57

R165180

C1260.22

R118390k

DA20DCC010

21

3

R185100k

R105390k

C1460.22

IC30BM5218AFP

+

-6

57

C1450.22

IC24AM5218AFP

+

-2

31

IC19CM5238AFP

+

-

84

DA19DCC010

21

3

IC18AM5218AFP

+

-2

31

C1370.22

IC24BM5218AFP

+

-6

57

C109

0.22

R114100k

C112 22p

IC29AM5218AFP

+

-2

31

IC21AM5218AFP

+

-2

31

C760.1

JK4

YKB21-5006

1

23

45

78

IC29BM5218AFP

+

-6

57

IC19BM5238AFP

+

-6

57

R113100k

C79 22p

C113

0.22

DA11DCC010

21

3

R187180

IC23AM5218AFP

+

-2

31

C138

0.22

R194180

C95 22p

DA2DCG010

1 2

3

R120180

R11722k

DA15DCC010

21

3

DA16DCC010

21

3

IC19AM5238AFP

+

-2

31

DA6DCC010

2 1

3

DA9DCC010

2 1

3

R142100k

R148180

JK6

YKB21-5006

1

23

45

78

R89 100k

IC21BM5218AFP

+

-6

57

R141100k

R151180

DA5DCC010

2 1

3

R112100k

IC15

TC74HC4052AF

3Y4

2Y2

1Y5

0Y1

3X11

2X15

1X14

0X12

YCOM3

XCOM13

INH6

B9

A10

VEE7

VCC16

GND8

IC16

TC74HC4052AF

3Y4

2Y2

1Y5

0Y1

3X11

2X15

1X14

0X12

YCOM3

XCOM13

INH6

B9

A10

VEE7

VCC16

GND8

R138100k

R101100k

R4310k

C440.01

R137100k

R425.6k

R100100k

DA1DCC010

2 1

3

L24BLM21A601S

L19BLM21A601S

CN4

SLD5R-1

1122334455

CN3

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Apr, 1998 SPD-20

Perform this procedure after repairs or the like to restorethe RAM to its factory preset status.This procedure will delete all data currently written toRAM and replace them with the factory preset data.

1. Turn ON the power while pressing both the [ ]and[ALL/ENTER] keys at the same time.The following display appears.

2. Press the [ALL/ENTER] key to execute initialization.If initialization is unnecessary, press a key other thanthe [ALL/ENTER] key.

To save the data stored in the RAM of the SPD-20 on anexternal device or to load the external data onto the RAMof the SPD-20, use the exclusive MIDI message.The following explains how to transmit and receive thedata.

NOTE: In some devices, the MIDI channel number andthe Device ID number can be set independently,and will not necessarily be the same. Whentransferring bulk data with another device, refer tothe operating manual for that device.

<How to transmit (Bulk Dump) >

Here's how to transmit the mamory data of the SPD-20.

Make connections between [MIDI OUT] of thetransmitter and [MIDI IN] of the receiver.

1. Set the Device ID number (=Basic Channel) on WhichExclusive data will be sent.

1 In edit mode, press [SELECT] to select SYSTEM.2 Use [], [] to select BASIC CH.3 Use [PATCH/VALUE] to specify the channel (1~

16).4 Press [EDIT] to return to play mode.

2. Use [], [] to select the SYSTEM parameter BULKDUMP.

8

LOADING THE FACTORY PRESET DATA

Apr, 1998SPD-20

DATA SAVE AND LOAD

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3. Use [PATCH/VALUE] to select the patch data youwish to transmit (ALL/1 ~ 99). If ALL is selected, allPatch data, Patch Chain data, and system parameterdata will be transmitted at once.

4. Set the receiving MIDI device so that it will be able toreceive Exclusive messages.

5. Press [ALL/ENTER] and data transmission will begin.<The time required of transmitting data>

All patch data ××××××××××××××××××××××about 65 secOne patch data ×××××××××××××××××××about a sec

If you wish stop the operation during transmission,press [EDIT].

6. If you wish to transmit other Patch data, repeat steps 3~ 5.

7. Press [EDIT] to return to play mode.

<How to receive (Bulk Load)>

Here's how to receive Patch data that was stored inanother SPD-20 or in a sequencer.

Make connections between [MIDI IN] of the transmitterand [MIDI OUT] of the receiver.

NOTE: When data is received, the previous settings willbe lost.

1. Make sure that the MIDI channel of the transmittingdevice matches the Basic channel of the receivingSPD-20.(refer to "How to transmit"-1)If you transfer Exclusive data from another SPD-20,set the basic channels on both units match.If you receive the Exclusive data that was stored in asequencer, set the basic channel to match the samenumber which was set when you saved data in thesequencer.

2. Press [EDIT] to enter edit mode.

3. Transmit the Exclusive data from the other MIDIdevice. When reception begins the following displaywill appear.

4. Press [EDIT] to return to play mode.

* Exclusive data transmission can require a significantamount of time, so allow a reasonable time for theseoperations. Data cannot be transmitted while incomingBluk data is being processed, nor can data bereceived while Bulk data is being transmitted.

If Bulk data (Exclusive data) is received during PatchChain play mode, the SPD-20 will return to normalplay mode when reception ends.

The ROM version can be checked on the "Version check"in "Test Mode".However,if can also be checked with the followingprocedure.

1. Trun ON the power supply while pressing both the[SELECT] and [EDIT] keys at the same time. Thefollowing will be displayed on the 7-segment LED.The displayed ROM version number is for the EP-ROM (IC10 on CPU Board).

2. Press any key to the nomal mode.

Use this procedure to check the voltage of the lithiumbattery.

1. Holding down [ ] and [FX ON/OFF] keyssimultaneously, turn on power.The LED display will show the status of the lithiumbattery.

The readings of 3.3 volts is a proof of a good batterycondition.If the readings is below 2.2V, the battery needs anexchange.

NOTE: The battery is also monitored during operation andcauses the error message if it goes below 2.2V.(Refer to "ERROR MESSAGES" section.)

2. To return to the operation mode, press any key.

SPD-20Apr, 1998

INDENTIFYING THE VERSION NUMBER

1.00 ×××××××××××××××××version number

CHECKING BATTERY VOLTAGE

10

The user data will be erased once the unit enters thetest mode.Be sure to save the user data before accessing thetest mode. Refer to "DATA SAVE AND LOAD" section.

'Tools and materials• Monitor speakers• MIDI cable• Foot switches (FS-5U) x 2• Connection cable (PCS-31)• Pad (PD-7,PD-120)• Monaural cable• Hi-Hat control pedal (FD-7)• Stereo cable

'Entering test mode

While pressing [ALL/ENTER] and [EDIT] keyssimultaneously, turn power on.The 7-seg LED will display as follows.

Press [ALL/ENTER] key, RAM,SOUND ROM, LITHIUMBATTERY check by automatic operation, and the display shows as folloes:

This display is "TEST MENU".

If not all tests succeeded, the display shows as follows.

RAM NG:

WAVE ROM NG:

BATTERY NG:

(The test mode is stoped.)

'Exiting test mode

Press [ALL/ENTER] key while in the test menu of the testmode.The following display will qppear and it will blink.After that SPD-20 exit the Test mode automatically.

'Test procedure

1.Version check

Press [SELECT] key, the 7-seg LED will display theversion number.

Press [SELECT] key the display returns to the test menu.

Apr, 1998SPD-20

TEST MODE< CAUTION >

1

2

L

R

Make connections as shown infollowing diagram. Pad (PD–7,PD-120)

Monaural Cable

MIDI Cable

Monitor Speakers

FS–5U

FS–5U

IN OUT

White

Red

Polarity Switch

SPD–20

PCS-31

fig. 1

fig. 2

fig. 3

fig. 4

fig. 5

2.0V

fig. 6

fig.7 (1.00.....Version number)

(Stereo cableonly PD-120)

11

During the subsequent tests, the number of segmentsbeing its is decremented by after returning to the menuscreen from a test.

2.LED check

Press [PATCH CHAIN] key to start the LED test.Verify that all LED turn on, one at a time.When all the segments have turned on, press [PATCHCHAIN] key.

3.SW check

Press [COPY] key and the display changes as follows:Press 12 keys on the right hand of the front panel one byone.Segments of the LED will be turned off, one at a time fora key pressed.When all keys are pressed, the 7-seg LED will show YES

and then return to the menu.

4.FOOT SW check

Connect FOOT SW socket to the foot switch via thecable PCS-31.

Press [EDIT] key and the 7-seg LED will show:Depress the pedals on the foot switch, one at a time.

As follows if the pressed pedal is good:Then the 7-seg LED will show YES before returning tothe menu.

5.MIDI check

Connect the MIDI IN to MIDI OUT using the MIDI cable.Press [] key to start the MIDI circuit test.

When the MIDI circuitry is good, the 7-seg LED showsYES and returns to the menu.

6.TRIGGER INPUT check

Set TRIG4/HH CTRL selector switch on the rear panel toTRIG4 position.

*TRIGGER CIRCUIT checkHit head of PD-7 one by one and listen to thespeakers.Verify all jacks are correctly localized(panning).

SOUND NAME PANTRIG1 Kick hard leftTRIG2 Snare hard rightTRIG3 Darbuk hard leftTRIG4 Cymbal hard right

*RIM CIRCUIT checkPress [BANK A/B] key. The 7-seg LED will change asfollows:

A monaural cable into TRIG1 ~ 4 jacks one by one.As follows if this check is good:

Now the 7-seg LED should show YES and return to themenu.

7.RIM A/D check

Press [LAYER] key. The 7-seg LED will change asfollows:

SPD-20Apr, 1998

fig. 8

fig. 9

fig. 10

fig. 11

fig. 12

fig. 13

fig. 14

1 2 3 4

fig. 15

fig. 16

12

Connect TRIG1 jack to the PD-120 via the stereo cable.Hit rim of the PD-120, the 7-seg LED will change asfollows:

Connect TRIG2 jack to the PD-120 via the stereo cable.Hit rim of the PD-120, the 7-seg LED will change as follows:

Press [LAYER] key the display returns to the test menu.

8.Hi-HAT CONTROL check

Connect the Hi-Hat control pedal(FD-7) to SPD-20 HHCTRL/TRIG4 socket via the monaural cable.

*Set HH CTRL/TRIG4 switch to HH CTRL.

Press [FX ON/OFF] key. The 7-seg LED will change as follows:

After entering the test mode, depress the control pedal.The 7-seg will first read a value X(fluctuating) and shouldread 0 at a maximum pressure.

Press [FX ON/OFF] key the display returns to the testmenu.

9.CROSSTALK check

Press [] key. The 7-seg LED will change as follows:

The displayed number represents a pad. The [-PATCH/VALUE+] keys scroll pads 1 through 8.Hit the pad being displayed. No output sound means thecircuitry is good.If the pad causes crosstalk sound, the display willindicate:

(The number of pad being checked on this display.)

Unlit segments indicate non-crosstalk pads and onebeing checked.

After completion of the test, press[] key and the displayreturn to the test menu.

10.VELOCITY check

Press [-PATCH/VALUE] key. The 7-seg LED will changeas follows:

Press the head of the 8 pads on the SPD-20 andobserve the velocity readings on the LED display. Thehighest readings should be 127.

After completion of the test, press[-PATCH/VALUE] keyand the display return to the test menu.

After completion of all tests, press [ALL/ENTER] key andthe 7-seg LEDreturns to the operation mode after displaying messageshown in (fig.5).

Apr, 1998SPD-20

fig. 17

fig. 18

fig. 19

fig. 20

5 6 7 8

1 2 3 4

fig. 21

1 2 3 4

5 6 7 8

fig. 22

fig. 23

Apr, 1998 SPD-20

13

If a problem occurs during operation, an error messagewill be displayed.Check which error message is displayed, and take theappropriate action as described in this section.

• The MIDI cable connecting another MIDI device to theSPD-20 is not connected correctly or may be broken./Check the MIDI cable and the connections with the

other device.

• Balk Data loading was not successful./Try loading once again.* Press any botton on the front panel and previous

display will reappear.

• MIDI data was received incorrectly.* Press any botton on the front panel and previous

display will reappear.

• Too much MIDI data was received from another MIDIdevice. /Reduce the amount of MIDI data transmitted by the

other device.Or, retransmit the data after an interval to reduce theamount of MIDI data transmitted in a short time.

* Press any botton on the front panel and previousdisplay will reappear.

• The memory data inside the SPD-20 has been lost./Press any button on the front panel. All data will be

initialized, and the normal display will reappear.* If this happens, all the data in the SPD-20 will be

reset to the factory preset settings.

• This indicates that there is an irregularity in the voltageof the pad detection circuit./IC15,IC16 or peripheral circuits may be at fault .* Press any botton on the front panel and previous

display will reappear.

NOTE: Sometimes this error message will appear if youstrike a pad while turning on the power. In thisevent, turn the power on once again.

• The memory backup battery inside the SPD-20 hasrun down./Have the battery replanced.* Press any botton on the front panel and previous

display will reappear.

1. Refer to the following for sticking positions of SensorAssys.

2. Press the Sensor Assy to an approximately 3-Kg loadfor 2 seconds after stiking of the sensor assy.

ERROR MESSAGES

How to exchange the Sensor and the Sensor Assy

Sensor

Hollow(To Decide The SENSOR Position)

Top Case

3kg2sec

Sensor

Top Case

14

Preventing mistriggering of two pads tapped simultaneously

When you tap two internal pads simultaeously they maypositively trigger the sound. If this is the case, follow thesteps described below.

This information is not found in the Owner's manual.

1. Holding BANK A/B and LAYER, turn on the powerswitch.The display will read 70 which is the factorysetting.

2. This value is the "crosstalk cancel" level set forthe internal pads.

Change this value to 50 by pressing PATCH/VALUE [+] or [-].Decreasing this value minimizes the chance of missingsound but increases the chance of cross talk. *1 Thereverse holds true.

*1 Crosstalk: A tap of a pad will cause a different pad totrigger its sound source. A pad on the SPD-20 tends to cause crosstalk when it isnot tapped at the center.

Note: With the crosstalk cancel set at 50, strong tappingof a pad at outer portion (from 2 cm fromperiphery) will cause a crosstalk. Ask the user howhe plays the pads and adjust the cancel level inthe range of 60 to 70.

CAUTION: Pads are disabled during setting sequence ofthe crosstalk cancel level.

3. Turn off power.

The setting is memorized and will be made effective asyou turn on the SPD-20 next time.

Remarks: Mistriggering is more likely to occur as twopads are tapped at the same time and withuneven forces (or out of the center of the pad).To reduce mistriggering: Tap pads at the centerwith same force; or not at the same time.

To set the crosstalk cancel level of the pads connectedto the TRIGGER INPUT of the SPD-20, refer to p.53 ofthe Owner's manual.

SPD-20 Apr, 1998

ADJUSTMENT

15

Photo Coupler(IC17 on MB)PC-410(15289125)

Oscillator(X1 on MB)SG-8002(01453945)

+5V Voltage Regulator(IC27 on MB)µPC78L05J(15199231)

Transistor(Q9 to 22 on MB)DTA114EK (15329507)

Transistor(Q1, 2, 28 on MB)2SA1037KR(15309101)

Transistor(Q37 on MB)2SB1184R F5(15309605)

Transistor(Q23 to 27, Q29 to 36

2SC2412KR(15319101)

FET(Q4, 5 on MB)2SK208Y(15329105)

-5V Voltage Regulator(IC25 on MB)µPC79L05J(15199233)

Transistor(Q301,302,303 on PB)DTC114EK (15329516)Transistor(Q3, 6, 7, 8 on CB)DTC343TK (15329514)

Q38 to 42 on MB)

q Anodee Cathoder GNDt V0y VCC

q 0Er GNDt OUT q OUT

w GNDe IN

q Emitterw Basee Collector

i VDD

µPC78L05Jq GNDw INe OUT

µPC79L05J

q Emitterw Basee Collector

q Emitterw Basee Collector

q Drainw Sourcee Gate

q Basew Collectore Emitter

PB Panel Board Assy (pcb 22935470 2/3)MB Main Board Assy (pcb 22935470 1/3)

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IC DATA

SPD-20Apr, 1998