SERVICE NOTESIssued by RJA

Apr.2002 OD-20(T)

(T)

TABLE OF CONTENTS

SPECIFIC.ATIONS............................................................2LOCATION OF CONTROLS ..........................................4LOCATION OF CONTROLS PARTS LIST ...................5EXPLODED VIEW ............................................................6EXPLODED VIEW PARTS LIST .....................................9PARTS LIST......................................................................10CHECKING THE VERSION NUMBER.......................13

RESTORING THE FACTORY SETTINGS...................13TEST MODE.....................................................................13BLOCK DIAGRAM.........................................................16CIRCUIT BOARD(JACK)...............................................18CIRCUIT BOARD(PANEL) ...........................................19CIRCUIT DIAGRAM(JACK) .........................................20CIRCUIT DIAGRAM(PANEL)......................................22

Copyright © 2002 ROLAND CORPORATIONAll rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.

Printed in Japan (0800) (NB)17058015E0

Apr.2002

SPECIFIC.ATIONSOD-20: Overdrive/Distortion

Nominal Input Level-20 dBu

Input Impedance1 MΩ

Nominal Output Level-20 dBu

Output Impedance1 kΩ

Recommended Load Impedance10 kΩ or greater

Dynamic Range102 dB (IHF-A typ.)

ControlsEFFECT ON/OFF Pedal

MANUAL/MEMORY Pedal

DRIVE Knob

BOTTOM Knob

TONE Knob

LEVEL Knob

ATTACK SHAPE Knob

HEAVY OCTAVE Knob

TYPE Knob

VARIATION Button

AMP CTRL (amp control) Button

MEMORY WRITE Button

MEMORY SELECT Button

IndicatorsPOWER Indicator (serves also as battery check indicator)

EFFECT ON/OFF Indicator

MANUAL Indicator

MEMORY Indicator

VARIATION Indicator

AMP CTRL (amp control) Indicator

MEMORY Number Indicator (1-4)

ConnectorsINPUT Jack

AMP CTRL (amp control) Jack

LINE OUT/PHONES Jack

OUTPUT Jack

AC Adaptor Jack (DC 9 V)

Power SupplyDC 9 V: Dry Battery (R6/LR6 (AA) type) x 6

AC Adaptor

Current Draw85 mA (9 V max.)

* Expected battery life under continuous use:

Carbon: 8 hours

Alkaline: 20 hours

These figures will vary depending on the actual conditions of use.

Dimensions173 (W) x 158 (D) x 57 (H) mm

6-13/16 (W) x 6-1/4 (D) x 2-1/4 (H) inches

Weight

1.1 kg / 2 lbs 7 oz (including batteries)

AccessoriesOwner’s Manual

English :G6017351

Japanese :G6017350

Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”):(********)

Dry battery (LR6 (AA) type) x 6:(********)

* We recommend that alkaline batteries be used when replacing the batteries.

OptionsAC Adaptor (PSA-series)

* 0 dBu = 0.775 Vrms

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

2

OD-20(T)

3

Apr.2002

LOCATION OF CONTROLSfig.front

fig.rear

1

2

3

6

7 9 10

5

8

11

12

13

14

15

1617

4

2 364 5 7

1 8

4

OD-20(T)

LOCATION OF CONTROLS PARTS LIST

[Front]

[Rear]

No. PART CODE PART NAME DESCRIPTION Q’TY1 H5029855 SCREW M4X8 HEXAGON BUTTON HEAD 42 G2477122 R-KNOB 5

F3279802 POTENTIOMETERNO CLICK 50KB RD901-40-125F-B54-00D 53 G247751001 VGA KEYTOP S BLACK WITH LENS 2

4 G2477122 R-KNOB 1F3279803 POTENTIOMETER 11 CLICKS 50KB RD901-40-125F-B54-11D 1

5 H5029851 PEDAL SHAFT 16 1502928100 LED (RED) L-34HDSL 37 G2187540 PEDAL L 18 G2017180 CASE 19 G2217171 LED PANEL 1

10 G2187541 PEDAL R 111 H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD 212 G2357116 PEDAL PLATE 62X53 213 F5029126 POWER LED L-113GDT 114 G247751301 VGA KEYTOP S WITHOUT LENS 2

15 1502928100 LED (RED) L-34HDSL 416 G2217170 PANEL 117 G2477122 R-KNOB 1

F3279819 POTENTIOMETER CENTER CLICK 50KB RD901-40-125F-B54-0CD 1

No. PART CODE PART NAME DESCRIPTION Q’TY1 13449150MF PHONE JACK (STEREO) HTJ-064-12D 32 G2537552 LABEL CAUTION 13 G2217172 REAR PANEL 14 G2017621 BATTERY COVER 15 G2017148 BOTTOM COVER 16 G2357118 BOTTOM FOOT 17 F3449415 ADAPTOR JACK KM02009AB 18 13449155MF PHONE JACK (MONO) HTJ-064-12I 1

5

Apr.2002

EXPLODED VIEWfig.expro1

33

32

26

24

c

k

21

b

d

23

25

b

e

f

6

OD-20(T)

fig.expro2

a

11

18

a

12

18

11

16

j

14

15

17

10

13

7

Apr.2002

fig.expro3

1

2

5

3i

4

g

hRIGHT SIDELEFT SIDE9

6

7

8

8

OD-20(T)

EXPLODED VIEW PARTS LIST

[Part]

[Screw]

No. PART CODE PART NAME DESCRIPTION Q’TY1 G2017180 CASE 12 G2357111 CUSHION R 23 H5029851 PEDAL SHAFT 24 2215770201 PEDAL GUIDE BUSH 215-702 25 2217710900 COIL SPRING 214-109 26 G2357116 PEDAL PLATE 62X53 27 G2357115 PEDAL FOOT M8 28 G2187541 PEDAL R 19 G2187540 PEDAL L 110 G2017148 BOTTOM COVER 111 G2357118 BOTTOM FOOT 212 G2017621 BATTERY COVER 113 G2017620 BATTERY CASE 114 G2177308 BATTERY TERMINAL(+) 115 G2177309 BATTERY TERMINAL(-) 116 G2177307 BATTERY TERMINAL(+-) 117 G2257130 BATTERY INSULATING SHEET 118 G2537552 LABEL CAUTION QUICK MANUAL 121 G2477122 R-KNOB 723 G2257129 INSULATING SHEET 124 G2217170 PANEL 125 G2217172 REAR PANEL 126 G2217171 LED PANEL 132 G247751301 VGA KEYTOP S WITHOUT LENS 233 G247751001 VGA KEYTOP S BLACK WITH LENS 2

No. PART CODE PART NAME DESCRIPTION Q’TYa H5029115 SCREW 3X8 PAN TAPTITE-2 FEBZC 7b H5019110 SCREW M3X6 PAN TAPTITE-2 FEZC 9c H5029855 SCREW M4X8 HEXAGON SOCKET BUTTON HEAD FENI 4d H5039205 WASHER 12.5X9.5X0.5/0.9 INTERNAL TOOTH FENI 4e H5039112 WASHER M9 4f H5039510 NUT M9X12X2 FENI 4g H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD 2h H5039413 NYLON WASHER M4.1X7.5X0.5 BLACK 2i H5039414 NYLON WASHER M5.1X9.5X0.5 BLACK 2j H5019430 SCREW M2.6X5 BINDING HEAD TAPTITE FEZC 2k H5039521 VR ACCESSORY NUT M7 7

9

Apr.2002

PARTS LISTfig.part1e

SAFETY PRECAUTIONS:The parts marked have safety-related characteristics. Use only listed parts for replacement.

CONSIDERATION ON PARTS ORDRINGWhen ordering any parts listed in the parts list, please specify the following items in the order sheet.

QTY PART NUMBER DESCRIPTION MODEL NUMBEREx. 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.

NOTE: The parts marked # are new. (initial parts)

CASING G2357116 PEDAL PLATE 62X53 2 G2017620 BATTERY CASE 1 G2017621 BATTERY COVER 1 G2017148 BOTTOM COVER 1 G2357118 BOTTOM FOOT 2# G2017180 CASE 1# G2217171 LED PANEL 1# G2217170 PANEL 1# G2187541 PEDAL R 1# G2187540 PEDAL L 1

H5029851 PEDAL SHAFT 2# G2217172 REAR PANEL 1

“KNOB,BUTTON” G2477122 R-KNOB 7 G247751001 VGA KEYTOP S BLACK WITH LENS 2 G247751301 VGA KEYTOP S WITHOUT LENS 2

SWITCH 01780101 SKQKAB TACT SWITCH SW3, SW4, SW5, SW6 on PB 4 13129778 SKQKAH TACT SWITCH SW1, SW2 on PB 2

JACK,EXT TERMINAL 13449150MF HTJ-064-12D PHONE JACK (STEREO) JK1, JK2, JK3 on JB 3 13449155MF HTJ-064-12I PHONE JACK (MONO) JK4 on JB 1 F3449415 KM02009AB ADAPTOR JACK JK5 on JB 1

PWB ASSY# E 75D693P000 JACK PWB ASSY # 75D693M000 PANEL PWB ASSY

IC# 02897545 MN101C30AHD OD-20 VER1.00 IC(CPU 8BIT) IC6 on JB 1# F5209123 S-80930ALMP-DAT-T2 IC (REST) IC7 on JB 1 F5179604 CAT24WC02J IC (EEPROM) IC4 on JB 1 02565501 TC220CCA0AF-B01(MR3) IC (DSP) IC5 on JB 1# F5179125 S-8520E33MC-BJS-T2 IC (DC-DC) IC8 on JB 1 15289109 M5216FP-600D IC (BIPOLAR OP AMP) IC10, IC11 on JB 2 15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC3 on JB 1 00346445 NJM2100M(TE3) IC (BIPOLAR OP AMP) IC1 on JB 1 02451434 AK4552VT IC (AD/DA) IC2 on JB 1

TRANSISTOR 00679045 2SA1298-Y(TE85R) TRANSISTOR Q5 on JB 1 15309104 2SA1586-GR(TE85R) TRANSISTOR Q4 on JB 1 15319108 2SC-3324GR-TE85R TRANSISTOR Q3, Q12 on JB 2 00562012 2SC3265-Y(TE85R) TRANSISTOR Q7 on JB 1 15319107 2SC4116-GR(TE85R) TRANSISTOR Q6, Q9, Q10 on JB 3 F5139608 IRF7606 POWER MOS FET Q11 on JB 1# F5329530 2SK879Y FET TRANSISTOR Q2, Q8 on JB 2 15329103 2SK880GR-TE85R FET TRANSISTOR Q1 on JB 1

DIODE 02562878 02DZ5.1-Y(TPH3) ZENER DIODE D8 on JB 1 01019534 1SS355 TE-17 SWITCHING DIODE D1, D4, D6, D10 on JB 4 F5029126 L-113GDT POWER LED LED2 on PB 1

10

OD-20(T)

1502928100 L-34HDSL LED (RED) LED3, 4, 5, 8, 9, 10, 11 on PB 7 F5029117 L-312LRD LED LED6, 7 on PB 2 15339119 1SS-352 DIODE D2 on JB 1 00783034 1SS294(TE85L) DIODE D3 on JB 1 15339120 1SS302 DIODE DA3 on JB 1 F5339137 SS14 VF=0.45V DIODE D5, D7 on JB 2

DIODE

RESISTOR F5419707 CRN34101J RESISTOR ARRAY RA5,6 on JB 2# F5399951 68(1/2W) CHIP RESISTOR (1/2W) R64, R68 on JB 2# F2569127 MINISMDC075 POLY SWITCH R48 on JB 1 00566867 RPC05T 100 J MTL.FILM RESISTOR R37, R76, R77, R79 on JB 4 00567023 RPC05T 101 J MTL.FILM RESISTOR R51 on JB 1 00567156 RPC05T 102 J MTL.FILM RESISTOR R6, R61 on JB 2 00567289 RPC05T 103 J MTL.FILM RESISTOR R1, R7, R11, R12, R13, R14, R15, R17, R19, 25 00567412 RPC05T 104 J MTL.FILM RESISTOR R10, R28, R45, R67, R75, R78, R82, R83, R86 12 00567556 RPC05T 105 J MTL.FILM RESISTOR R2, R3, R5, R27, R29, R44, R60 on JB 7 00567290 RPC05T 123 J MTL.FILM RESISTOR R25, R34 on JB 12 00567301 RPC05T 153 J MTL.FILM RESISTOR R23, R36 on JB 2 00567190 RPC05T 222 J MTL.FILM RESISTOR R57 on JB 1 00567334 RPC05T 273 J MTL.FILM RESISTOR R59 on JB 1 00566934 RPC05T 330 J MTL.FILM RESISTOR R54 on JB 1 00567089 RPC05T 331 J MTL.FILM RESISTOR R62, R69, R82 on JB 3 00567367 RPC05T 393 J MTL.FILM RESISTOR R30 on JB 1 00567245 RPC05T 472 J MTL.FILM RESISTOR R9, R66, R88 on JB 3 00567378 RPC05T 473 J MTL.FILM RESISTOR R8, R16, R21, R26, R31, R41, R47, R52, R53, 11 00567501 RPC05T 474 J MTL.FILM RESISTOR R4, R74 on JB 2 00567134 RPC05T 681 J MTL.FILM RESISTOR R72 on JB 1# F3829270 27(2W) METAL OXIDE RESISTOR R18, 22 on JB 2 F5429365 10K OHM F RANK (1%) CHIP RESISTOR R24 on JB 1 F5429386 150K F (1608TYPE) CHIP RESISTOR R20 on JB 1# F5419740 CRN34473J CHIP ARRAY RESISTOR RA4 on JB 1# F5419741 CRN34681J CHIP ARRAY RESISTOR RA2,3 on JB 2

POTENTIOMETER# F3279819 RD901-40-125F-B54-0CD 50KB ROTARY POT. W/CENTER CLICK VR2 on PB 1 F3279802 RD901-40-125F-B54-00D POTENTIOMETERNO CLICK 50KB VR1, VR3, VR4, VR5, VR6 on PB 5 F3279803 RD901-40-125F-B54-11D POTENTIOMETER 11 CLICKS 50KB VR7 on PB 1

CAPACITOR 02341489 ECPU1C474MA5 MYLAR CAPACITOR(SUBMI-

CRON) 1

# F5349704 ECPU1C474MA5 MYLAR CAPACITOR (SUBMI-CRON)

C1 on JB 1

# F5359732 GRM39B102J50PT CHIP CAPACITOR (1608 TYPE) C80 on JB 1 F5359780 GRM39B103K50PT CHIP CAPACITOR (1608 TYPE) C55, C56, C57, C58, C59, C60, C61, C72 on J 8# F5359382 GRM39B182J50PT CHIP CAPACITOR (1608 TYPE) C89, C95 on JB 2 F5359740 GRM39B222K50PT CHIP CAPACITOR (1608 TYPE) C5, C9 on JB 2# F5359812 GRM39B473J50PT CHIP CAPACITOR (1608 TYPE) C17, C33 on JB 2# F5359372 GRM39B683J50PT CHIP CAPACITOR (1608 TYPE) C67 on JB 1 F5359720 GRM39CH101J50PT CHIP CAPACITOR (1608 TYPE) C6 on JB 1# F5359803 GRM39CH151J50PT CHIP CAPACITOR (1608 TYPE) C83, C85, C88, C90 on JB 4# F5359370 GRM39CH180J50PT CHIP CAPACITOR (1608 TYPE) C69 on JB 1 F5359704 GRM39CH220J50PT CHIP CAPACITOR (1608 TYPE) C68, C70, C71 on JB 3# F5359373 GRM39CH271J50PT CHIP CAPACITOR (1608 TYPE) C12, C13, C22 on JB 3 F5359800 GRM39F104Z25PT CHIP CAPACITOR (1608 TYPE) C11, C21, C24, C26, C30, C32, C35, C36, C37 30# F3629692 0.22/50V CAPACITOR C87 on JB 1# F3629695TS 1/50V CAPACITOR C2, C3, C19, C29, C91, C94 on JB 6# F3629678TS 10/16V CAPACITOR C4, C7, C8, C10, C14, C15, C16, C18, C20, C 14# 13629550KM 100/16V CAPACITOR C31, C49, C52, C54, C76, C78, C81, C86, C92 9# 13629509KM 47/16V CAPACITOR C34, C74 on JB 2

INDUCTOR,COIL,FILTER F2449216 SLF7045T-151MR40 SMD COIL L3 on JB 1 02563478 NFM4516P13C204F EMI FILTER C48 on JB 1 F2449210 SLF7032T-4R7M1R7-2(4.7UH) COIL L2 on JB 1

CRYSTAL,RESONATOR 02673278 CX-49G 11.2896MHZ CRYSTAL X2 on JB 1 F5299108 HC-49SM 8MHZ CRYSTAL X1 on JB 1

CONNECTOR F3439160 53015-0210 2P P=2MM CONNECTOR CN4 on JB 1 F3439165 A2001WR2-10P CONNECTOR CN1 on JB 1# F3439200 A2001WR2-15P CONNECTOR CN2 on JB 1

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Apr.2002

WIRING,CABLE G3487163 WIRING BATTERY L=80MM 2P 1# G3467251 WIRING 15P L=52MM P=2MM CN2 on PB 1# G3487421 WIRING 10P L=40MM P=2MM CN1 on PB 1 G3477146 RIBBON CABLE 3P L=40X5X5 MM P=2MM CN3 on JB 1

SCREWS H5019110 SCREW M3X6 PAN TAPPING-2 FEZC 10 H5029115 SCREW 3X8 PAN TAPPING-2 FEBZC 7 H5039205 WASHER 12.5X9.5X0.5/0.9 INTERNAL TOOTH FENI 4 H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD 2# H5029855 SCREW M4X8 HEXAGON BUTTON HEAD 4 H5039510 NUT M9X12X2 FENI 4 H5039413 NYLON WASHER M4.1X7.5X0.5 BLACK 2 H5039414 NYLON WASHER M5.1X9.5X0.5 BLACK 2 H5019430 SCREW M2.6X5 BINDING HEAD TAPTITE FEZC 2 H5039521 VR ACCESSORY NUT M7 7 H5039112 WASHER M9 4

PACKING# G2627250 PACKING CASE 1 G2607212 PACKING CASE LOWER 1 G2237614 REAR PAD 1 G2237613 SIDE PAD 1

MISCELLANEOUS G2357115 PEDAL FOOT M8 2 H2369427 LED SPACER H=8MM 4 2215770201 PEDAL GUIDE BUSH 215-702 2 2217710900 COIL SPRING 214-109 2 G2257130 BATTERY INSULATING SHEET 1 G2177308 BATTERY TERMINAL(+) 1 G2177307 BATTERY TERMINAL(+-) 1 G2177309 BATTERY TERMINAL(-) 1 G2357111 CUSHION R 2 G2257129 INSULATING SHEET CENTER 1# G2537552 LABEL CAUTION 1 G2197126 LED GUIDE 1

ACCESSORIES (Standard)# G6017350 OWNER’S MANUAL JAPANESE 1# ******** ALKALINE BATTERY LR6SG-P2 3# G6017351 OWNER’S MANUAL ENGLISH 1

12

OD-20(T)

CHECKING THE VERSION NUMBERAfter you enter test mode, perform step 5.

1. Turn all knobs to MIN (all the way to the left).

2. While holding down the left pedal and the right pedal, insert the 9V plug into DC IN.

At this time, only the POWER LED will light.

3. Release the left and right pedals. The EFFECT ON/OFF LED will blink.

4. Within four seconds, press the left pedal and then the right pedal.

If you were successful in entering test mode, the EFFECT ON/OFF LED, MANUAL LED, and MEMORY LED will light.

5. Set the TYPE volume to METAL/LOUD.

. The version number will be indicated as follows.

For Ver1.00, only the MEMORY 2 LED will light.

(The integer portion is indicated by the MEMORY 1 and 2 LEDs

1: MEMORY 1 LED: dark MEMORY 2 LED: lit

2: MEMORY 1 LED: lit MEMORY 2 LED: dark

3: MEMORY 1 LED: lit MEMORY 2 LED: lit

The first decimal place is indicated by the MEMORY 3 and 4 LEDs

0: MEMORY 3 LED: dark MEMORY 4 LED: dark

1: MEMORY 3 LED: dark MEMORY 4 LED: lit

2: MEMORY 3 LED: lit MEMORY 4 LED: dark

3: MEMORY 3 LED: lit MEMORY 4 LED: lit

The second decimal place is indicated by the MANUAL LED and MEMORY LED

0: MANUAL LED: dark MEMORY LED: dark

1: MANUAL LED: dark MEMORY LED: lit

2: MANUAL LED: lit MEMORY LED: dark

3: MANUAL LED: lit MEMORY LED: lit )

RESTORING THE FACTORY SETTINGSReturning Settings to Their Factory Defaults

You can restore the memories (1-4), pedal mode settings, and the MEMORY Number Indication to their original factory values.

Memory Settings

Memory 1 LOUD

Memory 2 LEAD

Memory 3 OD-1

Memory 4 STACK

Pedal Mode

1 (MANUAL -> MEMORY 1 -> MEMORY 2 -> MEMORY 3 -> MEMORY 4 -> MANUAL)

MEMORY Number Indication

Lighting Pattern 1(Only the indicator for the selected memory lights up.)

Carrying out the following procedure completely clears the content currently stored in the memories (1-4).

1. Switch off the power.

Disconnect the connection plug from the INPUT jack.

2. While holding down the WRITE button, switch on the power.

Insert the connection plug into the INPUT jack.

When you release the button, the MEMORY Number indicators blink.

3. Press the MEMORY WRITE button.

After the MEMORY Number indicators begin blinking rapidly, the setting is stored in memory and the unit returns to its ordinary state.

* To cancel the setting change, operate the EFFECT ON/OFF pedal or the MANUAL/MEMORY pedal before pressing the MEMORY WRITE button. The unit will return to its ordinary state.

TEST MODE

Required items 1. Oscillator

2. Noise meter

3. Oscilloscope

4. Monitor amp (e.g., MA-12)

5. Guitar amp (with a channel-switching jack)

6. Stereo plug

7. 47kΩ short plug

1. How to enter test mode1. Turn all knobs to MIN (all the way to the left).

Connect a short plug (47kΩ) to INPUT.

2. While holding down the left pedal and right pedal, insert the 9V plug into DC IN.

At this time, only the POWER LED will light.

3. Release the left and right pedals. The EFFECT ON/OFF LED will blink.

4. Within four seconds, press the left pedal and then the right pedal.

If you were successful in entering test mode, the EFFECT ON/OFF LED, MANUAL LED, and MEMORY LED will light.

2. List of test items1. IC check

2. Switching noise / shock noise check

3. Residual noise check

4. SW and LED check

5. AMP control check

6. VR Check

7. DAC check (includes FET SW (EFFECT) inspection)

8. DSP thru check

9. Analog mute check (FET SW (DIRECT) inspection)

10. Version check

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Apr.2002

3. Test contents1. IC check1. When you enter test mode, the DSP(IC5) and EEPROM(IC4) check will

begin automatically.

2. If no problem is found, the EFFECT ON/OFF LED, MANUAL LED, and MEMORY LED will light.

3. If a problem is found, the LEDs will indicate the problem as follows.

ON/OFF LED blinking: EEPROM error

MANUAL LED blinking: DSP(PRAM) error

MEMORY LED blinking: DSP(IRAM) error

If a problem is found, the unit will remain in this state, and it will not be possible to carry out the remaining tests.

2. Switching noise / shock noise check1. With the EFFECT ON/OFF LED, MANUAL LED, and MEMORY LED lit,

connect a short plug (47kΩ) to INPUT, and a monitor speaker to OUTPUT.

2. Press the EFFECT ON/OFF switch several times, and verify that no abnormal switching noise occurs.

3. Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED go dark (ANALOG BYPASS), and drop the unit from a height of approximately 10 cm to subject it to physical shock. Verify that no abnormal noise occurs.

4. Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED light (DSP THRU), and drop the unit from a height of approximately 10 cm to subject it to physical shock. Verify that no abnormal noise occurs.

3. Residual noise check1. Connect a noise meter to the OUTPUT.

2. Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED light (DSP THRU), and measure the residual noise.

Verify that the value detected by the noise meter is below -73 dBm (IHF-A).

3. Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED go dark (BYPASS), and measure the residual noise.

Verify that the value detected by the noise meter is below -104 dBm (IHF-A).

4. SW and LED check1. Press the VARIATION switch, and you will proceed to the switch and

LED check.

First verify that only the VARIATION LED is lit.

The other LEDs will be dark.

Press the switches in the following order, and verify that in a similar way, only one LED at a time is lit.

2. Press the AMP CTRL switch, and verify that only the AMP CTRL LED is lit.

3. Press the MEMORY WRITE switch, and verify that only the EFFECT ON/OFF LED is lit.

4. Press the MEMORY WRITE switch, and verify that only the MANUAL LED is lit.

5. Press the MEMORY WRITE switch, and verify that only the MEMORY LED is lit.

6. Press the MEMORY SELECT switch, and verify that only the MEMORY 1 LED is lit.

7. Press the MEMORY SELECT switch, and verify that only the MEMORY 2 LED is lit.

8. Press the MEMORY SELECT switch, and verify that only the MEMORY 3 LED is lit.

9. Press the MEMORY SELECT switch, and verify that only the MEMORY 4 LED is lit.

(It is not possible to proceed to other test items before you have finished the above procedure.)

5. AMP control check1. Connect the AMP CTRL jack to the channel switching jack of the guitar

amp.

2. Verify that the guitar amp channel is switched each time you press the AMP CTRL SW.

6. VR check1. Turn the DRIVE volume from MIN to MAX, and verify that the

MEMORY 1-4 LEDs are all dark when the volume is at MIN (the instant you begin turning the volume), and light correspondingly as you turn the volume, so that all LEDs are lit when you reach MAX.

(Each VR you operate here must be left at the MAX position so that you will be able to proceed to the next test item.)

In the same way, perform this test in the following order for the other VR’s.

2. BOTTOM volume

3. TONE volume

4. LEVEL volume

5. ATTACK SHAPE volume

6. HEAVY OCTAVE volume

7. With the TYPE volume turned all the way to the left, turn it toward the right one click at a time, and verify that the LEDs change as follows. (TABLE A)

dark lit

(TABLE A)

TYPE EFFECT MANUAL MEMORY VARI AMPCTRL MEM1 MEM2 MEM3 MEM40 (OD-2/OD-1)

1 (BD-2/DS-1)

2 (HM-2/MT-2)

3 (BOOST/LEAD)

4 (CRUNCH/STACK)

5 (METAL/LOUD)

6 (T-SCREAM/FULL-D)

7 (DST+/CENTA OD)

8 (GUV DS/P-RAT)

9 (R-MAN/MUFF FUZZ)

10 (FACE/OCT FUZZ)

14

OD-20(T)

7. DAC check1. Set the TYPE volume to BD-2/DS-1.

2. Connect an oscilloscope to OUTPUT, and check the output waveform (DSP oscillation).

fig.1

(200mV/div, 1msec)

3. Press MEMORY SELECT. The MEMORY 4 LED will go dark, and the output signal will be muted. Verify that the signal is less than -67 dBm (IHF-A).

4. Connect an oscilloscope to LINE OUT/PHONES, and check the L and R output waveform (DSP oscillation).

fig.2

(200mV/div, 1msec)

5. Press MEMORY SELECT. The MEMORY 4 LED go dark, and the output signal will be muted. Verify that the noise for L and R is less than -68 dBm (IHF-A).

8. DSP thru check1. Set the TYPE volume to HM-2/MT-2.

2. Connect an oscillator to INPUT, and input a 344 Hz, 50 mVp-p square wave.

3. Connect an oscilloscope to OUTPUT, and check the output waveform.fig.3

(500mV/div, 1msec)

9. Analog mute check1. Set the TYPE volume to BOOST/LEAD.

2. Connect an oscillator to INPUT, and input a 344 Hz, 50 mVp-p sine wave.

3. Connect an oscilloscope to OUTPUT, and check the output waveform.fig.4

(20mV/div, 1msec)

4. Press MEMORY SELECT. The MEMORY 4 LED will go dark, and the output signal will be muted. Verify that its level is less than -77 dBm (IHF-A).

15

Apr.2002 OD-20(T)

BLOCK DIAGRAMfig.block

INPUT

DC IN

OUTPUT

AMP CTRL

LINEOUT/PHONES

IC2

CODEC

IC3AMP

FET SWQ2

Q8FET SW

BUFFERQ3

AMP,LPFIC11

TR SW

Q4,Q5,Q7

IC6

CPU

RESET

IC7

IC5

DSPCOMPARATORIC10

Q10FILTER

IC8

DC-DC CONVERTER

Q11,

EEPROMIC4

BUFFER

Q1

PRE EMPHASISAF/AD

IC1

BUFFER

Q12

DE EMPHASIS

BATTERY CN4

TR SW TR SWQ6Q9

-9V

CN3CN5

WIRING 10P

WIRING 15P

CN1

CN2

CN1

CN2

VR1,VR2,VR3,VR4

VR5,VR6,VR7

SW1,SW2,SW3

SW4,SW5,SW6

LED1,LED2,LED3,LED4

LED5,LED6,LED7,LED8

LED9,LED10,LED11,LED12

RIBON CABLE

PANEL BOARD

JACK BOARD

3pin +A 9

+D 3. 3

JK1

1

23

JK2

1

23

JK4

1

23

JK3

1

23

JK5213

X211.2896MHz1

2

X18MHz

1 2

1

2

3

1 2

1 2

16 17

Apr.2002

CIRCUIT BOARD(JACK)Circuit_Jack-1.eps

Circuit_Jack-2.eps

18

OD-20(T)

CIRCUIT BOARD(PANEL)Circuit_Panel.eps

19

Apr.2002 OD-20(T)

CIRCUIT DIAGRAM(JACK)fig.jack

GUITAR INPUT

DC IN

TO BATTERY

OUTPUT

AMP CTRL

148/40usPre-Emphasis

DC IN

td=48ms

PHONES/LINE

LED_POWER

LED_AMP_CTRL

CA3

CA3

LED_ON/OFF

LED_4

LED_4LED_3

LED_MEMORY

LED_VARIATION

LED_MANUAL

LED_ON/OFFLED_MANUALLED_MEMORYLED_AMP_CTRLLED_VARIATION

LED_3

CA4

CA4

LED_2

LED_2

P03P04

LED_1

LED_1

VR_TONE

VR_ATTACKVR_OCTAVE

VR_LEVEL

VR_BOTTOM

VR_TYPEVR_DRIVE

CA1CA0

CA1

CA2

CA0

CA2

SW_ON/OFF

SW_VARIATION

SW_ON/OFF

SW_AMP CTL

SW_WRITE

SW_MAN/MEMSW_VARIATION

SW_MAN/MEM

SW_AMP CTL

SW_SELECT

SW_SELECTSW_WRITE

P04P03

+

+D 3. 3

D

+D 3. 3

A

+D 3. 3

D

+

AA

+

+D 3. 3

+

A

+

A

A

+

AA

+

+D 3. 3

+ +

+

+

+

A A A

+

D

+D 3. 3

D

D

+D 3. 3

D

D

D

+D 3. 3

D

D

+D 3. 3

+D 3. 3

D

+D 3. 3

D

+D 3. 3

+D 3. 3

D

D

D

+D 3. 3

D

D

+D 3. 3

D

+D 3. 3

AD

D

+D 3. 3

D

D

-

A

A

D

+

A A A

+

+D 3. 3

D

D

+D 3. 3

D

D

D

+D 3. 3 +

D

DD

-

+

A

A

A

A

A

A

A

A

+

A

+

+

A

+D 3. 3

D

+D 3. 3

+

A

A

A

R110k

C1

0.47S

Q12SK880GR

3

12

L3SLF7045T-151MR37-2(150uH)

IC8S-8520E33MC-BJS-T2

ON/OFF1

VIN5

VSS2

EXT4

VOUT3

D7SS14

C76100/16

CN3

112233

RIBON CABLE 2mm 3P

11 22 33

D5SS14

IC2 AK4552VT

LIN2

SDTO8

RIN1

VD5 MCLK

11BCLK12

PDN13

DEM17

VCOM14

LRCK10

VSS3

SDTI9

DEM06

VA4

ROUT16

LOUT15 +

-

IC3BM5218AFP

6

57

R2512k

R3412k

D41SS355

12

Q82SK879Y 3

12

Q10 2SC4116GR

1

23

C790.1

C510.1 C54

100/16

C52100/16

C530.1

C77 0.1

C330.047

R45100k

R51M

R61k

Q11 IRF7606

S2

D7

S3

D5

G4

S1

D8

D6

R23 15k

C12 270p

R3615k

C22270p

R29

1M

C4

10/16

Q22SK879Y 3

12

D11SS355

12

R271M

R2147k

C170.047

R28100k

R2

1M

R3

1M

R30

39k

R26 47k

C13 270p

R1710k

C90.0022

C191/50

R4470k Q3

2SC3324GR1

23C3

1/50C21/50

C31100/16

C320.1

R4010k

R4610k

C2010/16

C210.1

R3510k

R3310k

+

-

IC1CNJM2100M

84

C35

0.1

R49

10k

R50

10k

C42 0.1

C44 0.1

C46 0.1

C40 0.1

C38 0.1

C6918pX2

CX-49G 11.2896MHz

C67 0.068

C43 0.1

C45 0.1

C47 0.1

C36 0.1

R611k

C34 47/16

R54 33

R601M

IC5TC220C120AF-006(MR3)

OSC1

VS

S2

OSCSEL3

VS

S4

XTO5

XTI6

VD

D7

DIVS08 DIVS19

PLLBP10

VS

S11

VS

S12

TESTP13

VD

D14

VDD15

PLLVAA16

PLLRO17

PLLLP18

PLLAGS19

PLLAGD20

VSS21

VS

S22

VD

D23

VD

D24

RST25

VS

S26

CD727

CD628

CD529

CD430

VS

S31

TESTS32

VD

D33

CD334

CD235

CD136

CD037

VD

D38

DRQ39INT040INT141

DRST42

VS

S43

CA444

CA345

CA246

CA147

CA048

VD

D49

RD50

CS51

VS

S52

WR53

VS

S54

DIV55

VD

D56

DA057

AD058

VD

D59

BCK60

VS

S61

LRCK062

LRCK163

VD

D64

MCK65

VS

S66

DA167

AD168

DA269

AD270

VS

S71

CTYPE72

VD

D73

DA374

AD375

SYI76

TESTB77

TESTT78

VD

D79

VS

S80

C640.1

X149US SMD1 8MHz

C70 22p

C68 22p

R51

100

C58

0.01

C57

0.01

C59

0.01

C60

0.01

C56

0.01

C55

0.01

C61

0.01

IC4

CAT24WC02J

A01

A12

A23

VSS4 SDA

5

SCL6

WP7

VCC8

R1827 (2W)

R3710

C240.1

C2310/16 C25

10/16C260.1

C300.1

C291/50

JK1

HTJ-064-12D

1

23

C5

0.0022 C6 100p

C710/16

R16

47k

R8

47k

+

-

IC1ANJM2100M

2

31

R12

10k

+

-

IC1BNJM2100M

6

57

R20150k(F)

R24

10k(F)

TP1 TH1

TP2 TH1

R5347k

R5247k

JK2

HTJ-064-12D

1

23

RIBON CABLE 2mm 3P

11 22 33

C810/16

C1510/16

C1610/16

Q52SA1298Y

1

32

R1310k

Q42SA1586GR

1

32

R1510k

R1110k

R3210k

C48NFM4516P13C204F

JK6 DJ-0711-020213

JK5 KM02009_B213

R572.2k

Q72SC3265Y

1

23

R48miniSMDC075

C1010/16

C110.1

R1410k

R1910k

L2SLF7032T-4R7M1R7-2 (4.7uH)

IC6 MN101C30A

LED3/D3/P8357

LED2/D2/P8258

LED1/D1/P8159

LED0/D0/P8060

AN0/PA062AN1/PA163AN2/PA264AN3/PA31AN4/PA42AN5/PA53AN6/PA64AN7/PA75

VDD7

OSC28

OSC19

VSS10

P22/IRQ229 P23/IRQ330 P24/IRQ431

P67/A744

P27/RST21MMOD13

LED7/D7/P8753

LED6/D6/P8654

LED5/D5/P8555

LED4/D4/P8456

P66/A643

P65/A542

P64/A441

P63/A340

P62/A239

P61/A138

P60/A037

P70/A845 P71/A946 P72/A1047 P73/A1148 P74/A1249 P75/A1350 P76/A1451 P77/A1552

P21/IRQ1/SENS28

P20/IRQ027

VREF+6

VREF-61

X111

X012

P50/WE32 P51/RE33 P52/CS34 P53/A1635 P54/A1736

P14/TM4IO26

P13/TM3IO25

P11/TM1IO23P12/TM2IO24

P10/TM0TO/RMOUT22

P06/BUZZER/DK20

P05/SBT119

P04/SBI118

P03/SBO117

P02/SBT016

P01/SBI0/RXD15

P00/SBO0/TXD14

C78100/16

C1410/16

C1810/16

RA5 1001 82 73 64 5

D61SS3551

2

C720.01

R62330

D9

N.I.U.

12

D802DZ5.1Y

12

RA6 100

1 82 73 64 5

R5547k

R5647k

CN2

A2001WR2-15P

11 22 33 44 55 66 77 88 99 10

10 1111 1212 1313 1414 1515

RA447k

18

27

36

45

RA2 680

1 82 73 64 5

RA3 680

1 82 73 64 5

Q62SC4116GR

1

23

R4147k

R441M

Q92SC4116GR

1

23

R3147k

R4747k

R5810k

C800.001

R2227 (2W)

JK4

HTJ-064-12I

1

23

CN4

53015-0210

1122

C39 0.1

C41 0.1

C37 0.1

R10100k

+

-

IC3AM5218AFP

2

31

+

-

IC3CM5218AFP

84

C840.1

R73 10k

R75

100k

R78

100k

R74470k

+

-IC10C

M5216FP

84

R7710

C9310/16

C6510/16

C74 47/16

C6310/16

+

-IC10B

M5216FP

6

57

C750.1

+

-IC10A

M5216FP

2

31

C7122p

C660.1

C620.1

R79

10

C94

1/50

D10

1SS355

1 2

C91 1/50

DA3 1SS30221

3

R76

10

C92100/16

+

- IC11A

M5216FP

2

31

R82100k

R83100k

C950.0018

R65330

R94.7k

+

- IC11B

M5216FP

6

57

R86100k

R87100k

C90150p

R69330

R67100k

C87

0.22/50

C49

100/

16

C50

0.1

C83150p

C88150p

C85150p

R710k

JK3

HTJ-064-12D

1

23

C81

100/16

R81 10k

R8010k

R664.7k

R8410k

R85 10kC890.0018

C86

100/16

R64

68(1/2W)

R68

68(1/2W)

R72 680

+

- IC11C

M5216FP

84

D2

1SS352

D3

1SS294

R88 4.7kR59 27k

CN1

A2001WR2-10P

11 22 33 44 55 66 77 88 99 10

10

R7010k

C730.1

IC7

S-80930CLMC

OUT1

Cp5

VDD2

NC4

VSS3

IC12

N.I.U.(S-80130ALMC-JAP-T2)

DS1

GND2

NC3

VDD5

OUT4

Q122SC3324GR1

23

R100

10k

R10110k

R102100k

R103100k

C100 N.I.U.

C101 N.I.U.

C102 N.I.U.

20 21

Apr.2002 OD-20(T)

CIRCUIT DIAGRAM(PANEL)fig.panel-c

(50KB) (50KB) (50KB) (50KB)

EFFECT ON/OFF MANUAL

(50KB) (50KB)

MEMORY VARIATION 1234

DRIVEBOTTOMTONELEVELATTACK

OCTAVETYPE

AMPCTRL

EFFECT ON/OFF

MAN/MEM VARIATION AMP CTRL WRITE SELECT

(50KB 11click )

SHAPEHEAVY

(CENTER CLICK)

+D 3. 3

D

+D 3. 3

D

+D 3. 3 +D 3. 3 +D 3. 3 +D 3. 3 +D 3. 3 +D 3. 3+D 3. 3 +D 3. 3

D

+D 3. 3

D D D D D D D

+D 3. 3

VR2

RD901-40-125F-B54-0CD

1

2

3

VR4

RD901-40-125F-B54-00D

1

2

3

VR1

RD901-40-125F-B54-00D

1

2

3

VR3

RD901-40-125F-B54-00D

1

2

3

VR6

RD901-40-125F-B54-00D

1

2

3

VR5

RD901-40-125F-B54-00D

1

2

3

VR7

RD901-40-125F-B54-11D

1

2

3

LED12L-113GDT

12

LED5

L-34HDSL

12

LED6

L-312LRD

12

LED8

L-34HDSL

12

LED9

L-34HDSL

12

LED10

L-34HDSL

12

LED11

L-34HDSL

12

LED3

L-34HDSL

12

LED4

L-34HDSL

12

LED7

L-312LRD

12

C1 N.I.U.

SW1

SKQKAH12

SW2

SKQKAH12

SW3

SKQKAB12

SW4

SKQKAB12

SW5

SKQKAB12

SW6

SKQKAB12

CN2

WIRRING 15P

11223344556 6778899101011111212131314141515

CN1

WIRRING 10P

1122334455667 788991010

22 23

Apr.2002

24