Roland OD-20 Operating and maintenance manual

SERVICE NOTES
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) (NB)
17058015E0
Apr.2002 OD-20(T)
TABLE OF CONTENTS
SPECIFIC.ATIONS............................................................2
LOCATION OF CONTROLS ..........................................4
LOCATION OF CONTROLS PARTS LIST ...................5
EXPLODED VIEW ............................................................6
EXPLODED VIEW PARTS LIST .....................................9
PARTS LIST......................................................................10
CHECKING THE VERSION NUMBER.......................13
RESTORING THE FACTORY SETTINGS...................13
TEST MODE.....................................................................13
BLOCK DIAGRAM.........................................................16
CIRCUIT BOARD(JACK)...............................................18
CIRCUIT BOARD(PANEL) ...........................................19
CIRCUIT DIAGRAM(JACK) .........................................20
CIRCUIT DIAGRAM(PANEL)......................................22
(T)

2
Apr.2002
SPECIFIC.ATIONS
OD-20: Overdrive/Distortion
Nominal Input Level
-20 dBu
Input Impedance
1 MΩ
Nominal Output Level
-20 dBu
Output Impedance
1 kΩ
Recommended Load Impedance
10 kΩor greater
Dynamic Range
102 dB (IHF-A typ.)
Controls
EFFECT 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
Indicators
POWER 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)
Connectors
INPUT Jack
AMP CTRL (amp control) Jack
LINE OUT/PHONES Jack
OUTPUT Jack
AC Adaptor Jack (DC 9 V)
Power Supply
DC 9 V: Dry Battery (R6/LR6 (AA) type) x 6
AC Adaptor
Current Draw
85 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.
Dimensions
173 (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)
Accessories
Owner’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.
Options
AC Adaptor (PSA-series)
*0dBu = 0.775 Vrms
* In the interest of product improvement, the specifications and/or appearance of
this unit are subject to change without prior notice.

3
OD-20(T)

4
Apr.2002
LOCATION OF CONTROLS
fig.front
fig.rear
1
2
3
6
7910
5
8
11
12
13
14
15
16
17
4
236
457
18

5
OD-20(T)
LOCATION OF CONTROLS PARTS LIST
[Front]
[Rear]
No. PART CODE PART NAME DESCRIPTION Q’TY
1 H5029855 SCREW M4X8 HEXAGON BUTTON HEAD 4
2 G2477122 R-KNOB 5
F3279802 POTENTIOMETERNO CLICK 50KB RD901-40-125F-B54-00D 5
3 G247751001 VGA KEYTOP S BLACK WITH LENS 2
4 G2477122 R-KNOB 1
F3279803 POTENTIOMETER 11 CLICKS 50KB RD901-40-125F-B54-11D 1
5 H5029851 PEDAL SHAFT 1
6 1502928100 LED (RED) L-34HDSL 3
7 G2187540 PEDAL L 1
8 G2017180 CASE 1
9 G2217171 LED PANEL 1
10 G2187541 PEDAL R 1
11 H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD 2
12 G2357116 PEDAL PLATE 62X53 2
13 F5029126 POWER LED L-113GDT 1
14 G247751301 VGA KEYTOP S WITHOUT LENS 2
15 1502928100 LED (RED) L-34HDSL 4
16 G2217170 PANEL 1
17 G2477122 R-KNOB 1
F3279819 POTENTIOMETER CENTER CLICK 50KB RD901-40-125F-B54-0CD 1
No. PART CODE PART NAME DESCRIPTION Q’TY
1 13449150MF PHONE JACK (STEREO) HTJ-064-12D 3
2 G2537552 LABEL CAUTION 1
3 G2217172 REAR PANEL 1
4 G2017621 BATTERY COVER 1
5 G2017148 BOTTOM COVER 1
6 G2357118 BOTTOM FOOT 1
7 F3449415 ADAPTOR JACK KM02009AB 1
8 13449155MF PHONE JACK (MONO) HTJ-064-12I 1

6
Apr.2002
EXPLODED VIEW
fig.expro1
33
32
26
24
c
k
21
b
d
23
25
b
e
f

7
OD-20(T)
fig.expro2
a
11
18
a
12
18
11
16
j
14
15
17
10
13

8
Apr.2002
fig.expro3
1
2
5
3
i
4
g
hRIGHT SIDE
LEFT SIDE
9
6
7
8

9
OD-20(T)
EXPLODED VIEW PARTS LIST
[Part]
[Screw]
No. PART CODE PART NAME DESCRIPTION Q’TY
1 G2017180 CASE 1
2 G2357111 CUSHION R 2
3 H5029851 PEDAL SHAFT 2
4 2215770201 PEDAL GUIDE BUSH 215-702 2
5 2217710900 COIL SPRING 214-109 2
6 G2357116 PEDAL PLATE 62X53 2
7 G2357115 PEDAL FOOT M8 2
8 G2187541 PEDAL R 1
9 G2187540 PEDAL L 1
10 G2017148 BOTTOM COVER 1
11 G2357118 BOTTOM FOOT 2
12 G2017621 BATTERY COVER 1
13 G2017620 BATTERY CASE 1
14 G2177308 BATTERY TERMINAL(+) 1
15 G2177309 BATTERY TERMINAL(-) 1
16 G2177307 BATTERY TERMINAL(+-) 1
17 G2257130 BATTERY INSULATING SHEET 1
18 G2537552 LABEL CAUTION QUICK MANUAL 1
21 G2477122 R-KNOB 7
23 G2257129 INSULATING SHEET 1
24 G2217170 PANEL 1
25 G2217172 REAR PANEL 1
26 G2217171 LED PANEL 1
32 G247751301 VGA KEYTOP S WITHOUT LENS 2
33 G247751001 VGA KEYTOP S BLACK WITH LENS 2
No. PART CODE PART NAME DESCRIPTION Q’TY
a H5029115 SCREW 3X8 PAN TAPTITE-2 FEBZC 7
b H5019110 SCREW M3X6 PAN TAPTITE-2 FEZC 9
c H5029855 SCREW M4X8 HEXAGON SOCKET BUTTON HEAD FENI 4
d H5039205 WASHER 12.5X9.5X0.5/0.9 INTERNAL TOOTH FENI 4
e H5039112 WASHER M9 4
f H5039510 NUT M9X12X2 FENI 4
g H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD 2
h H5039413 NYLON WASHER M4.1X7.5X0.5 BLACK 2
i H5039414 NYLON WASHER M5.1X9.5X0.5 BLACK 2
j H5019430 SCREW M2.6X5 BINDING HEAD TAPTITE FEZC 2
k H5039521 VR ACCESSORY NUT M7 7

10
Apr.2002
PARTS LIST
fig.part1e
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)
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