Roland Boss RC-20XL Operating and maintenance manual

SERVICE NOTES
Issued by RJA
Copyright © 2004 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 (0500) (TP)17058256E0
Sep.2004 RC-20XL
TABLE DF CONTENTS
CAUTIONARY NOTES ...................................................2
SPECIFICATIONS.............................................................2
LOCATION OF CONTROLS ..........................................4
LOCATION OF CONTROLS PARTS LIST ...................5
EXPLODED VIEW, EXPLODED
VIEW PARTS LIST ........................6
PARTS LIST......................................................................10
CHECKING THE VERSION NUMBER.......................13
SERIAL DUMP (SYSTEM UPDATE, USERS
DATA SAVE AND LOAD) ..............13
INSTRUCTIONS FOR FACTORY RESET ...................14
TEST MODE.....................................................................14
BLOCK DIAGRAM.........................................................19
CIRCUIT BOARD (PANEL) ..........................................20
CIRCUIT DIAGRAM (PANEL).....................................22
CIRCUIT BOARD (JACK)..............................................24
CIRCUIT DIAGRAM (JACK 1) .....................................26
CIRCUIT DIAGRAM (JACK 2) .....................................28

2
Sep.2004
CAUTIONARY NOTES
User data status
User data status after each of the following processes is described below.
Whenever carrying out procedures that involve deleting or erasing user data,
always be sure to back up the user data to some form of external media (refer
to Saving and Loading Data).
* Executing Test Mode during Factory Reset deletes the user data.
PARTS LIST
Due to one or more of the following reasons, parts with parts code ********
cannot be supplied as service parts.
• Part supplied only as a component in a complete assembly
• Copyright does not permit the part to be supplied
• Part is sold commercially
SPECIFICATIONS
Nominal Input Level
INST: -20 dBu (variable)
MIC: -40 dBu (variable)
AUX IN: -10 dBu
Input Impedance
INST: 1 M ohms
MIC: 1 k ohms
AUX IN: 47 k ohms
Nominal Output Level
OUTPUT: -20 dBu
Output Impedance
1 k ohms
Recommended Load Impedance
10 k ohms or greater
Internal Memory
Recording time: 16 min. (max.)
Maximum number of saved phrases:
11 phrases (max.)
Controls
REC/PLAY/OVERDUB Pedal, STOP/TAP TEMPO Pedal, INST Knob, MIC
Knob, PHRASE SELECT Knob, GUIDE Knob, LEVEL Knob, REVERSE Button,
TAP TEMPO Button, WRITE Button, EXIT Button, AUTO START Button,
MODE Button
Indicators
POWER (serves also as battery check indicator), REC, PLAY, OVERDUB,
PEAK, LOOP QUANTIZE, LOOP PHRASE, ONE SHOT PHRASE, TAP
TEMPO, REVERSE, WRITE, EXIT, AUTO START, MODE, INST & MIC,
NORMAL, CENTER CANCEL, FLAT AMP SIMULATE
Connectors
INST Jack (1/4 inch phone type)
MIC Jack (1/4 inch phone type)
AUX IN Jack (Stereo miniature phone type)
PHRASE SHIFT Jack (1/4 inch TRS phone type)
REVERSE Jack (1/4 inch phone type)
OUTPUT Jack (1/4 inch phone type)
AC Adaptor Jack
Power
DC 9V: Dry battery (R6/LR6 (AA) type) x 6
AC Adaptor (PSA-series)
Power Consumption
120 mA (9 V max.)
* Expected battery life under continuous use:
Carbon: 6 hours
Alkaline: 16 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
1.2 kg / 2 lbs 11 oz (including batteries)
Accessories
Owner’s Manual ENGLISH:(#G6017384)
JAPANESE:(#G6017382)
Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and
“Information”):(#********)
Dry battery (AA type) x 6:(#********)
Sound Library for RC-20XL (Sample Phrase CD):(#********)
Options
AC Adaptor (PSA-series)
Foot Switch (FS-5U)
*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.
Process User Data
Checking Version number Preserved
SERIAL DUMP Deleted
Test Mode Preserved

3
RC-20XL

4
Sep.2004
LOCATION OF CONTROLS
fig.panel
19
30
31 31
30

5
RC-20XL
LOCATION OF CONTROLS
PARTS LIST
NO PART CODE CATEGORY PART NAME DESCRIPTION Q’TY
1 G2017145 CASING TOP CASE 1
2 G2187530 CASING PEDAL R 1
3 G2187531 CASING PEDAL L 1
4 G2357116 CASING PEDAL PLATE 62X53 2
5 H5029851 CASING PEDAL SHAFT 2
6 G2217185 CASING PANEL 1
7 H5029855 SCREWS SCREW M4X8 HEXAGON BUTTON HEAD NI 4
8 F3279802 POTENTIOMETER POTENTIOMETERNO CLICK 50KB RD901-40-125F-B54-00D 2
9 F3279803 POTENTIOMETER POTENTIOMETER 11 CLICKS 50KB RD901-40-125F-B54-11D 1
10 F3279805 POTENTIOMETER POT.(W/O CLICK) RD901-40-125F-AF5-00D 250KA 2
11 G2477122 KNOB,BUTTON R-KNOB 5
12 G247751001 KNOB,BUTTON VGA KEYTOP S BLACK WITH LENS 4
13 G247751301 KNOB,BUTTON VGA KEYTOP S WITHOUT LENS 2
14 G2217186 CASING LED PANEL 1
15 1502928100 DIODE LED (RED) L-34HDSL 8
16 F5029117 DIODE LED L-312LRD 4
17 F5029125 DIODE LED (YELLOW) L-34YDSL 1
18 F5029124 DIODE LED (GREEN) L-34GDSY 2
19 15029342 DIODE LED GL3ED8 1
20 F5029126 DIODE POWER LED L-113GDT 1
21 G2527110 CASING REAR PANEL PANEL 1
22 F344941501 JACK,EXT TERMINAL ADAPTOR JK KM02009BB 1
23 F3449707 JACK,EXT TERMINAL PHONE JK(STREO) HTJ-064-12DS 1
24 13449155MF JACK,EXT TERMINAL PHONE JACK (MONO) HTJ-064-12I 3
25 F3449709 JACK,EXT TERMINAL 3.5MM MINI JACK SHJ-3513TS (STEREO) 1
26 G2017621 CASING BATTERY COVER 1
27 75D422E000 CASING BOTTOM COVER 1
28 G2357118 MISCELLANEOUS BOTTOM FOOT 2
29 G2537558 MISCELLANEOUS QUICK MANUAL&CAUTION LABEL 1
30 F3129306 SWITCH SWITCH SKQKAB 6
31 13129778 SWITCH TACT SWITCH SKQKAh 2

6
Sep.2004
EXPLODED VIEW, EXPLODED VIEW PARTS LIST
EXPLODED VIEW1
fig.explo-1
EXPLODED VIEW 1 PARTS LIST
[PART]
[SCREW]
NO PART CODE PART NAME DESCRIPTION Q’TY
1 G2017145 TOP CASE 1
2 G2357111 CUSHION R 2
3 H5029851 PEDAL SHAFT 2
4 2215770201 PEDAL GUIDE BUSH 215-702 2
5 2217710900 COIL SPRING 217-109 2
6 G2357116 PEDAL PLATE 62X53 2
7 G2357115 PEDAL FOOT M8 2
8 G2187530 PEDAL R 1
9 G2187531 PEDAL L 1
NO PART CODE PART NAME DESCRIPTION Q’TY
g H5029852 SCREW4M3 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
1
2
5
3
i
4
g
hRIGHT SIDE
LEFT SIDE
9
6
7
8

7
RC-20XL
EXPLODED VIEW 2
fig.explo-2
EXPLODED VIEW 2 PARTS LIST
[PART]
[SCREW]
NO PART CODE PART NAME DESCRIPTION Q’TY
21 G2477122 R-KNOB 5
24 G2217185 PANEL 1
26 G2217186 LED PANEL 1
32 G247751301 VGA KEYTOP S WITHOUT LENS 2
33 G247751001 VGA KEYTOP S BLACK WITH LENS 4
NO PART CODE PART NAME DESCRIPTION Q’TY
c H5029855 SCREW M4X8 HEXAGON BUTTON HEAD NI 4
k H5039521 VR ACCESSORY NUT M7 5
32
32
33 33
c
26
24
k
21

8
Sep.2004
EXPLODED VIEW 3
fig.explo-3
EXPLODED VIEW 3 PARTS LIST
[PART]
[SCREW]
NO PART CODE PART NAME DESCRIPTION Q’TY
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 G2537558 QUICK MANUAL&CAUTION LABEL 1
NO PART CODE PART NAME DESCRIPTION Q’TY
a H5019115 SCREW M3X8 PAN TAPPING-2 FEBZC 7
j H5019430 SCREW M2.6X5 BINDING HEAD TAPTITE P FEZC 2
a
a
12
18
11
16
j
14
15
10
13
17
Refer to Fig A
Magnified view
Magnified view

9
RC-20XL
EXPLODED VIEW (Fig. A)
fig.explo-4
EXPLODED VIEW(Fig. A) PARTS LIST
[PART]
[SCREW]
NO PART CODE PART NAME DESCRIPTION Q’TY
1 G2017145 TOP CASE 1
19 75E183M000 JACK BOARD ASSY 1
20 75E183P000 PANEL BOARD ASSY 1
22 G225712901 INSULATING SHEET CENTER 1
25 G2527110 REAR PANEL 1
34 ******** This PWB ASSY is inclueded the JACK BOARD ASSY. 1
46 G2147821 JACK HOLDER 1
NO PART CODE PART NAME DESCRIPTION Q’TY
b H5019110 SCREW M3X6 PAN TAPTITE FEZC 13
e H5039510 NUT M9X12X2 FENI 5
f H5039112 WASHER M9 5
m H5039324 MINI JACK NUT AJ324A-3C 1
f
e
25
1
b
m
46
22
b
20
34
19



10
Sep.2004
PARTS LIST
fig.part1e
SAFETY PRECAUTIONS:
The parts marked have
safety-relatedcharacteristics.Use
only listed parts for replacement.
NOTE: The parts marked # are new. (initial parts)
Due to one or more of the following reasons,
parts with parts code ******** cannot be supplied as service parts.
• Part supplied only as a component in a complete assembly
• Copyright does not permit the part to be supplied
• Part is sold commercially
The description "Q'TY" means a necessary number of the parts per one product.
CASING
#G2527110 REAR PANEL 1
G2357116 PEDAL PLATE 62X53 2
G2017620 BATTERY CASE 1
G2017621 BATTERY COVER 1
75D422E000 BOTTOM COVER 1
G2357118 BOTTOM FOOT 2
# G2217186 LED PANEL 1
# G2217185 PANEL 1
G2187531 PEDAL L 1
G2187530 PEDAL R 1
H5029851 PEDAL SHAFT 2
# G2017145 TOP CASE 1
CHASSIS
G3487163 WIRING BATTERY L=80MM 2P 1
KNOB,BUTTON
G2477122 R-KNOB 5
G247751001 VGA KEYTOP S BLACK WITH LENS
4
G247751301 VGA KEYTOP S WITHOUT LENS
2
SWITCH
13129778 TACT SWITCH SKQKAH SW1,SW8 on PB 2
F3129306 SWITCH SKQKAB SW2,SW3,SW4,SW5,SW6,SW7 on PB 6
JACK,EXT TERMINAL
F3449709 3.5MM MINI JACK SHJ-3513TS (STEREO) JK3 on JK 1
F344941501 ADAPTOR JK KM02009BB JK6 on JK 1
13449155MF PHONE JACK (MONO) HTJ-064-12I JK1,JK2,JK5 on JK 3
F3449707 PHONE JK(STREO) HTJ-064-12DS JK4,JK7 on JK 2
PWB ASSY
#75E183M000 JACK BOARD ASSY 1
# 75E183P000 PANEÇk BOARD ASSY 1
IC
#F5279861 M12L16161A-7T IC (SDRAM) IC1 on JK 1
F5209123 S-80930ALMP-DAT-T2 IC (REST) IC6 on JK 1
F5289102 NJM2100M 8P SOP IC (OP.AMP) IC13 on JK 1
15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC9,IC10,IC12,IC15 on JK,IC1 on PB 5
02121556 LC24085B-SD1 IC (I/F) IC4 on JK 1
F5179125 S-8520E33MC-BJS-T2 IC (DC-DC) IC16 on JK 1
# 03675078 UPD703106AGJ-087-UEN IC (CPU) IC3 on JK 1
# F5279306 TC4W66F IC (CMOS) IC11 on JK 1
15259884 TC7S08F(TE85L) IC (CMOS) IC7 on JK 1
02451434 AK4552VT IC (AD/DA) IC14 on JK 1
F5279305 TC4066BFT IC IC8 on JK 1
TRANSISTOR
15319107 2SC4116-GR(TE85R) TRANSISTOR Q12 on JK,Q2,Q1 on PB 1
15329521 RN1307(TE85R) TRANSISTOR Q1,Q2,Q3,Q4,Q11,Q13,Q14,Q15,Q16,Q17 on JK
10
F5139608 IRF7606 POWER MOS FET Q18 on JK 1
15329103 2SK880GR-TE85R FET TRANSISTOR Q9,Q10 on JK 2
# F5329522 RN2307 DIGITAL TRANSISTOR Q5,Q6,Q7,Q8 on JK 4

11
RC-20XL
1Z
DIODE
#F5019309 02DZ5.1-Y ZENNER DIODE D9 on PB 1
F5029126 L-113GDT POWER LED LED17 on PB 1
F5029125 L-34YDSL LED (YELLOW) LED6 on PB 1
1502928100 L-34HDSL LED (RED) LED2,LED3,LED4,LED12,LED13,LED14,LE
D15,LED16
8
F5029124 L-34GDSY LED (GREEN) LED5,LED7 on PB 2
15029342 GL3ED8 LED LED1 on PB 1
F5029117 L-312LRD LED LED8,LED9,LED10,LED11 on PB 4
15339119 1SS-352 DIODE D1 on JK,D1,D2,D3,D4,D5,D6,D7,D8 on PB 1
15339120 1SS302 DIODE DA2,DA5,DA6,DA7 on JK 4
F5339138 1SS355 DIODE D2 on JK 1
F5339137 SS14 VF=0.45V DIODE D5,D6 on JK 2
RESISTOR
F5419707 CRN34101J RESISTOR ARRAY RA13 on JK 1
F5419716 CRN34103J RESISTOR (CHIP) RA8,RA14,RA18,RA19,RA20 on JK 5
F5419715 CRN34680J RESISTOR (CHIP) RA1,RA2,RA3,RA4,RA5,RA7,RA11,RA12,RA15,RA16,
11
F5399115 100 J RESISTOR R9,R11,R14,R18,R21,R22 on JK 6
F5399145 12K J RESISTOR R65,R72 on JK 2
F5399157 39K J RESISTOR R80 on JK 1
F5399133 4.7K J RESISTOR R37,R33 on JK 2
F5399296 4.7J RESISTOR R74 on JK 1
F5399158 47K J RESISTOR R30,R32,R34,R39,R40,R49,R50,R51,R52,R53,
R59,R9,R10 on PB
12
F5399166 82K J RESISTOR R36 on JK 1
F2569127 MINISMDC075 POLY SWITCH R86 on JK 1
F5399129 1.5K J MTL.FILM RESISTOR R24 on JK 1
F5399104 10 J MTL.FILM RESISTOR R83,R7 on JK 2
F5399170 100K J MTL.FILM RESISTOR R35,R43,R46,R89 on JK,R4 on PB 4
F5399140 10K J MTL.FILM RESISTOR R1,R10,R12,R13,R23,R25,R26,R27,R29,R38,
R41,R,R3 on PB
27
# F5399180 150K MTL.FILM RESISTOR R45,R56 on JK 2
F5399147 15K J MTL.FILM RESISTOR R66,R70,R71 on JK 3
F5399128 1K J MTL.FILM RESISTOR R88,R100,R102,R105 on JK,R6 on PB 4
F5399200 1M J MTL.FILM RESISTOR R15,R28,R31 on JK,R5,R7on PB 3
# F5399117 220 MTL.FILM RESISTOR R16,R17 on JK 2
F5399152 22K J MTL.FILM RESISTOR R57,R60 on JK 2
F5399106 47 J MTL.FILM RESISTOR R8,R90 on JK 2
# F5429393 47KD MTL.FILM RESISTOR R48,R55,R58,R63,R77,R79 on JK 6
F5399160 56K J MTL.FILM RESISTOR R68,R73,R78 on JK 3
# F5429394 56KD MTL.FILM RESISTOR R75,R82 on JK 2
# F5399109 68 MTL.FILM RESISTOR R3,R4,R5,R19,R20,R44,R61,R91,R92,R96,R98,R10
12
# F5399165 68K MTL.FILM RESISTOR R76 on JK 1
F5399127 1.2K J RESISTOR R1 on PB 1
F5399154 27K J MTL.FILM RESISTOR R8 on PB 1
# F5399118 330 MTL.FILM RESISTOR R2 on PB 1
POTENTIOMETER
F3279802 RD901-40-125F-B54-00D
POTENTIOMETERNO CLICK 50KB
VR3,VR2 on PB 2
F3279803 RD901-40-125F-B54-11D POTENTIOMETER 11 CLICKS 50KB
VR1 on PB 1
F3279805 RD901-40-125F-AF5-00D 250KA POT.(W/O CLICK) VR4,VR5 on PB 2
CAPACITOR
F5399158 47K J RESISTOR 2
F5349704 ECPU1C474MA5 0.47 MYLAR CAPACITOR (SUBMICRON)
C45,C55,C59 on JK 3
F5367542 10/16V ALUMINIUM ELECTROLYTIC CAPACITOR C62,C72,C77,C78,C81,C85 on
JK,C7,C8,C9,C10,C11,C12 on PB
6
F5367542 10/16V ALUMINIUM ELECTROLYTIC CAPACITOR 6
F5367546 100/16V ALUMINIUM ELECTROLYTIC CAPACITOR C1,C14,C16,C18,C30,C83,C86,C89 on JK 8
F5367503 47/6.3V ALUMINIUM ELECTROLYTIC CAPACITOR C84 on JK 1
# F5359348 0.0056 CHIP CAPACITOR C42,C63,C68 on JK 3
# F5359328 0.01 CHIP CAPACITOR C19,C20,C21,C46,C48,C52 on JK 6
# F5359313 0.1 CHIP CAPACITOR C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C17,
32
# F5359313 0.1 CHIP CAPACITOR C1 on PB 1
F5369805 470P CHIP CAPACITOR C56,C61 on JK 2
F5369601 1/50V CHIP CAPACITOR C47,C49,C67,C75 on JK,C5,C6 on PB 4
# F5359311 100P CHIP CAPACITOR C51 on JK 1
# F5359318 10P CHIP CAPACITOR C22,C23,C64,C70,C74 on JK 5
# F5359708 22P CHIP CAPACITOR C25,C24 on JK 2
# F5359309 33P CHIP CAPACITOR C53,C57 on JK 2
F5359387 GRM39B102K50PT 0.001 K CERAMIC CAPACITOR C43,C32 on JK 2
F5359345 0.027U (1608TYPE) CAPCITOR (CHIP) C50 on JK 1
INDUCTOR,COIL,FILTER
F2449210 SLF7032T-4R7M1R7-2(4.7UH) SMD COIL L19 on JK 1
F5409102 N1608Z601T02 FERRITE-BEAD L1,L2,L3,L4,L5,L7,L9,L10,L16,L17,L22 on JK 11

12
Sep.2004
#F5409117 NFM4516P13C204F EMI FILTER C80 on JK 1
12449386 SBT-0180W EMI FILTER FL1 on JK 1
F2449209 SLF7032T-151MR29-2(150UH) COIL L20 on JK 1
INDUCTOR,COIL,FILTER
CRYSTAL,RESONATOR
F5299114 HC-49SM 5MHZ CRYSTAL X3 on JK 1
# F5299104 MA-406 (24.576MHZ) CRYSTAL X2 on JK 1
CONNECTOR
F3439160 53015-0210 2P P=2MM CONNECTOR CN6 on JK 1
F3439167 A2001WR2-14P CONNECTOR CN1,CN3 on JK 2
# F3439193 A2001WV2-7P CONNECTOR CN2 on JK 1
WIRING, CABLE
G3477146 RIBBON CABLE 3P L=40X5X5 MM P=2MM CN4,CN5 on JK 1
# G3487419 WIRING 14P CN1,CN2 on PB 2
SCREWS
H5019110 SCREW M3X6 PAN TAPTITE FEZC 13
H5019115 SCREW M3X8 PAN TAPPING-2 FEBZC 7
H5029852 SCREW 4M3 FEBZC HEXAGON SOCKET BUTTON HEAD
2
H5029855 SCREW M4X8 HEXAGON BUTTON HEAD NI 4
H5039510 NUT M9X12X2 FENI 5
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 P FEZC
2
H5039324 MINI JACK NUT AJ324A-3C 1
# G2147821 JACK HOLDER 1
H5039521 VR ACCESSORY NUT M7 5
H5039112 WASHER M9 5
PACKING
#F2569113 CD PAD 1
G2607212 PACKING CASE LOWER 1
# G2627754 PACKING CASE(UPPER) 1
G2237613 REAR PAD 1
G2237614 SIDE PAD 1
MISCELLANEOUS
G2357115 PEDAL FOOT M8 2
# G2537558 QUICK MANUAL&CAUTION LABEL 1
H2369427 LED SPACER H=8MM on PB 8
# H2369406 LED SPCER H=7MM(FOR GL3ED8) on PB 1
2217710900 COIL SPRING 217-109 2
2215770201 PEDAL GUIDE BUSH 215-702 2
G2257130 BATTERY INSULATING SHEET
1
G2177308 BATTERY TERMINAL(+) 1
G2177307 BATTERY TERMINAL(+-) 1
G2177309 BATTERY TERMINAL(-) 1
G2357111 CUSHION R 2
G225712901 INSULATING SHEET CENTER 1
G2197126 LED GUIDE on PB 1
ACCESSORIES (Standard)
#G6017383 CD MANUAL ENGLISH/JAPANESE 1
# ******** CD ROM DEMO PHRASE 1
G601730301 IMPORTANT NOTES ENGLISH/JAPANESE 1
# G2537733 LEAF CAUTION JAPANESE/ENGLSIH 1
# G6017382 OWNER’S MANUAL JAPANESE 1
# G6017384 OWNER’S MANUAL ENGLISH 1

13
RC-20XL
CHECKING THE VERSION
NUMBER
1. Completely turn down all volume controls.
2. Hold down the left pedal (ON/OFF) and right pedal (TAPL/MEMORY)
and connect the +9 V DC plug to the ADAPTOR JACK.
(This turns on the power).
* If no +9 V DC plug is available to connect to the ADAPTOR JACK, the power
can be turned on by placing batteries in the unit and connecting a cable to the
OUTPUT jack.
3. Only the POWER LED lights up.
4. Release the left and right pedals.
5. Press the left and right pedals, in that sequence, within a period of two
second.
6. The unit enters Test mode, and all LEDs other than the PEAK LED light.
* Failure of all LEDs other than the PEAK LED to light indicates an error. For
more detailed information, refer to the individual test categories in “Test Mode.”
7. Press the right pedal.
The internal ROM version and external FLASH version are indicated by the
LEDs.
Display of the Internal ROM Version
This is indicated by the four LEDs “FLAT AMP SIMULATE,” “CENTER
CANCEL,” “NORMAL,” and “INST & MIC.”
Display of the External FLASH Version
This is indicated by the four LEDs “REVERSE,” “TAP TEMPO,” “WRITE,”
“EXIT,” “AUTO START,” “LOOP PHRASE,” and “LOOP QUANTIZE.”
SERIAL DUMP(SYSTEM
UPDATE, USERS DATA SAVE
AND LOAD)
The following data can be transmitted and received between two RC-20
units without using any other devices.
1. Program
The RC-20XL’s original external FLASH ROM can be updated by setting the
RC-20XL with the latest version as the transmitting device and the RC-20XL
with the previous version as the receiving device.
2. Guide sound
The RC-20XL’s guide sound can be transmitted and received.
3. Phrases (1-11)
Any RC-20XL phrase to which the Phrase Select Volume has been saved can be
transmitted and received.
Use this function to save the user’s phrases temporarily during repairs.
Procedure
1. Connect the transmitting RC-20XL and the receiving RC-20XL as follows.
Connect the REVERSE jack and PHRASE SHIFT jack respectively.
Transmitting RC-20XLReceiving RC-20XL
REVERSE ----------> PHRASE SHIFT
PHRASE SHIFT ----------> REVERSE
2. Start up the transmitting RC-20XL in Dump mode.
1) While holding down the [TAP TEMPO] and [AUTO START] buttons,turn
on the power of the transmitting RC-20XL.
2) [EXIT] and the [FLAT AMP SIMULATE] and [REC] [PLAY] [OVERDUB]
indicators will light.
3. Start up the receiving RC-20XL in Update mode.
1) Turn the [LEVEL] knob and [GUIDE] knob all the way to the left.
2) Set the [PHRASE SELECT] knob to 1.
3) While holding down the [REVERSE] and [MODE] buttons, turn on the
power of the receiving RC-20XL.
4) Within three seconds of turning on the power, press the [REVERSE] button
and then the [MODE] button.
[WRITE] and the [FLAT AMP SIMULATE] and [REC] [PLAY] [OVERDUB]
indicators will light.
* In Dump mode the [EXIT] indicator will light, but in Update mode the
[WRITE] indicator will light.
4. Select the data that you want to send from the transmitting RC-20XL
1)Press the [TAP TEMPO] button to select the data that you want to send.
The type of data being transmitted is indicated by the [TAP TEMPO] LED.
2)If the [TAP TEMPO] indicator is green, use the [PHRASE SELECT]
knob to select the phrase that will be transmitted.
5. Transmit the data from the transmitting RC-20XL.
Transmission will begin when you press the left pedal of the transmitting RC-
20XL.
During transmission, the “CENTER CANCEL” [MODE] indicator lights for
both devices.
Transmission and reception are completed when the [MODE] indicator stops
at “FLAT AMP SIMULATE” on both the transmitting and receiving RC-20XL.
When the [TAP TEMPO] indicator goes off, the [MODE] indicator on the
transmitting device stops at “FLAT AMP SIMULATE,” and the [MODE]
indicator on the receiving device stops at “INST&MIC.”
State of the transmitting RC-20XL
“FLAT AMP SIMULATE” Waiting to transmit
* The RC-20XL will briefly be in this state between data items.
*Since the guide sound data is divided into two parts, the RC-20XL will briefly be
in this state even when transmitting only the guide sound data.
“CENTER CANCEL” Now transmitting
“NORMAL” No data for transmission
State of the receiving RC-20XL
“FLAT AMP SIMULATE” Waiting for reception
* The RC-20XL will briefly be in this state between data items.
* Since the guide sound data is divided into two parts, the RC-20XL will
briefly be in this state even when receiving only the guide sound data.
“CENTER CANCEL” Now receiving
“NORMAL” Error
* An error will also occur if memory becomes full.
With the factory settings, transmitting the program, guide sound, and all
phrases will require approximately 2 minutes.
Never turn off the power until transmission/reception has been completed. 6.
Repeat steps 4. - 5. as necessary.
7. Turn off the power when you are finished.
LED Version
Only “FLAT AMP SIMULATE” lit Ver1.00
Only “CENTER CANCEL” lit Ver1.01
Only “NORMAL” lit Ver1.02
Only “INST & MIC” lit Ver1.03
LED Version
Only “TAP TEMPO” lit Ver1.01
Only “WRITE” lit Ver1.02
Only “EXIT” lit Ver1.03
Only “AUTO START” lit Ver1.04
Only “LOOP PHRASE” lit Ver1.05
Only “LOOP QUANTIZE” lit Ver1.06
[TAP TEMPO] Transmitting data
Dark Program, Guide sound, All phrases
Green Specified phrase
Red Guide sound
Orange Program

14
Sep.2004
INSTRUCTIONS FOR FACTORY RESET
The RC-20XL can be restored to its original factory settings with the following
procedure.
Restoring the factory settings with this procedure requires another RC-20XL
currently programmed with the factory settings.
Procedure
1. Turn on the power to the RC-20XL that is to have the factory settings
restored.
2. Turn the PHRASE SELECT knob to “1.”
3. Hold down SHIFT(EXIT) and press the DELETE(WRITE) button, causing
the two indicators to flash.
The RC-20XL is put in delete standby.
4. Press the DELETE(WRITE) button.
The indicator lights while the delete is in progress; when the delete is finished,
the indicator light goes off.
Do not turn off the power to the unit while the WRITE indicator or EXIT
indicator is lit.
All data saved to the Phrase tracks is completely deleted.
5. Repeat Steps 2-4 above for the PHRASE SELECT knob settings “2” to “4.”
6. Turn off the power to the unit.
7. As per the instructions for “Serial Dump” above, set the RC-20XL to
which the factory settings are being loaded as the receiving device and
the RC-20XL already containing the factory settings as the transmitting
device.
1) When the settings are transmitted, the [TAP TEMPO] indicator in Step 4 of
“Serial Dump” is green.
2) Set PHRASE SELECT VOLUME to “5” to execute transmission/reception of
the data.
8. Set PHRASE SELECT VOLUME to “6” and repeat the procedure for 6 to
11.
9. Turn off the power to the unit.
10. Confirm that the phrases with the factory settings are saved to PHRASE
SELECT VOLUME 5-11.
TEST MODE
Test items
1. FLASH ROM check
2. Version number check
3. Switch and LED check
4. LEVEL volume check
5. GUIDE volume check
6. DA check
7. Output check
8. INST volume check
9. MIC volume check
10. MUTE check
11. AUX IN (NORMAL) check
12. AUX IN (FLAT AMP SIMULATE) check
13. AUX IN (CENTER CANCEL) check
14. AUX IN (L ch) check
15. solder spot check
16. PHRASE SELECT volume check
17. Noise check
18. Battery operation check
Items required for tests
• Oscillators x 2
• Oscilloscope
• Noise meter
• Monitor amp
• FS-5U x 2
• 1k ohm stereo mini short plug:(#17041376)
• 150 ohm short plug:(#17041511)
• 47k ohm short plug:(#17041375)
• Parallel box(BOSS J-5 etc.)
• +9V DC PLUG(AC ADAPTOR BOSS PSA-series)
• Stereo phone <-> monaural phone conversion cable(PCS-31 ect.)
• Stereo mini <-> monaural phone conversion cable
Entering test mode
• Refer to the following figure and connect the diagnostic equipment.
fig.setuzokuzu-e
• Set all volumes to minimum.
• While hoding the left pedal and right pedal, connecte the adaptor to the
AC ADAPTOR JACK to trun on the power.
When only the POWER LED is lit, within two seconds press the left pedal and
then the right pedal.
• You will enter Test mode, and all LEDs other than “PEAK” will either
light or blink.
A FLASH ROM check is automatically performed when you enter Test mode.
The state of the LEDs when you enter
Test mode will depend on the result of this test. For details refer to the
following item “1. FLASH check.”
For details on how to skip directly to a desired test item, refer to “Skipping
directly to the desired test,” following the explanations of each test item.
150K
47K
OSCILLOSCOPE
CH2CH1
Noise Meter
9V PLAG
PSA ADPTOR
(0.5V/DIV,1mS/DIV)
200mVp-p
-37dBm
INST :
AUX :
MIC :
Monitor Amp
or or Parallel BOX
J-5
FS-5U x 3
GND
R
L
GND GND
L side
R side
Ocillator
Ocillator

15
RC-20XL
Exiting Test Mode
Turn off the power
Explanation of each test item
1.FLASH ROM check
• Enter Test mode.
• The FLASH ROM check will be performed when you enter Test mode.
• If there are no problems, all LEDs other than “PEAK” will light.
If there is a problem, the state of the LEDs will indicate the problem as
follows.
“OVERDUB” (yellow) blinking : MAKER ID error
“PLAY” (green) blinking : DEVICE ID error
“REC” (red) blinking : BUSY error
If a problem was found, operation will stop and it will not be possible to
proceed to the next step. Turn off the power to exit Test mode.
If there are any unlit LEDs regardless of whether or not there was a problem, it
is possible that the LED is faulty or soldered incorrectly. (With the exception of
“PEAK.”)
2.Version number check
• Press the right pedal.
•The internal ROM version number and the external FLASH ROM version
number will be indicated by the LEDs.
Internal ROM version number display
This is indicated by the four LEDs “FLAT AMP SIMULATE”, “CENTER
CANCEL”, “NORMAL”, and “INST & MIC.”
“FLAT AMP SIMULATE” only lit : Ver1.00
“CENTER CANCEL” only lit : Ver1.01
“NORMAL” only lit : Ver1.02
“INST & MIC” only lit : Ver1.03
External FLASH ROM version number display
This is indicated by the following six LEDs: “TAP TEMPO”, “WRITE”, “EXIT”,
“AUTO START”, “ONE SHOT PHRASE”,
and “LOOP QUANTIZE.”
“TAP TEMPO” only lit : Ver1.01
“WRITE” only lit : Ver1.02
“EXIT” only lit : Ver1.03
“AUTO START” only lit : Ver1.04
“ONE SHOT PHRASE” only lit : Ver1.05
“LOOP QUANTIZE” only lit : Ver1.06
• After verifying the version, press the right pedal.
• All LEDs other than “PEAK” will light.
3.Switches and LED check
• Connect two FS-5U units to the PHRASE SHIFT jack and REVERSE
jack.
• Set the FS-5U polarity switches to the position shown in the diagram.
fig.FS5U_40
• Press the REVERSE switch.
• Verify that “REVERSE”, “PLAY”, and “OVERDUB”, go dark, and that
“TAP TEMPO” changes from orange to red.
• Press the TAP TEMPO switch, and verify that “TAP TEMPO” goes
dark.
• Press the WRITE switch, and verify that “WRITE” goes dark.
• Press the EXIT switch, and verify that goes dark “EXIT.”
• Press the AUTO START switch, and verify that “AUTO START” goes
dark.
• Press the MODE switch, and verify that “INST & MIC”, “NORMAL”,
“CENTER CANCEL”, and “FLAT AMP SIMULATE” go dark.
• Press the FS-5U connected to the PHRASE SHIFT jack (left channel), and
confirm that the “ONE SHOT PHRASE” indicator light goes off.
• Press the FS-5U connected to the PHRASE SHIFT jack (right channel),
and confirm that the “LOOP PHRASE” indicator light goes off.
• Press the FS-5U that is connected to the REVERSE jack, and verify that
all LEDs other than “PEAK” light.
4.LEVEL volume check
•Refer to the connection diagram in “Entering Test Mode” and connect the
diagnostic equipment.
Input
INST : 200Hz, square wave, 200 mVp-p
MIC : 200 Hz, sine wave, -34 dBm
AUX IN : 200 Hz, square wave, 200 mVp-p, STEREO
• Move the LEVEL volume to approximately the center position, and
then back to the minimum position.
• Move the LEVEL volume from ‘minimum’ to ‘maximum’, and verify
that the waveform increases smoothly.
At this time, the MODE LEDs will light consecutively from “FLAT
AMP SIMULATE,” following the waveform.
• With the LEVEL volume at maximum, verify that the output waveform
is the same as shown in the diagram.
• Confirm that all LEDs other than PEAK are lit.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p
5.GUIDE volume check
• Move the GUIDE volume to approximately the center position, and
then back to the minimum.
• Move the GUIDE volume from ‘minimum’ to ‘maximum,’ and verify
that the waveform increases smoothly.
At this time, the MODE LEDs will change successively from “FLAT
AMP SIMULATE,” following the waveform.
• With the GUIDE volume at maximum, verify that the output waveform
is the same as shown in the diagram.
• Confirm that all LEDs other than PEAK are lit.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p

16
Sep.2004
6.DA check
• Once again check the output wavwform at the point that “5.GUIDE
volume check” is completed, to check the DC leakage and level.In the
following cases, the result is NG.
7.OUTPUT check
.Set the INST volume and MIC volume to ‘minimum’.
.Set the PHRASE SELECT volume to the ‘REVERSE’ are lit.
.Verify that the output waveform is as shown in the diagram.
fig.AUX+DA_40
(0.5V/DIV, 1mS/DIV)
The waveform will change slightly depending on the inaccuracy of the input
function.
8.INST volume check
• Set the PHRASE SELECT volume to the ‘3’ position.
• Verify that “REVERSE” is dark and “TAP TEMPO” is lit red.
• Set the INST volume to ‘minimum,’ and slowly move it to ‘maximum.’
• Verify that the waveform increases smoothly.
• Verify that that when the INST volume is at maximum, the waveform is
the same as shown in the diagram.
fig.INST_40
(0.5V/DIV, 1mS/DIV)
1.2Vp-p 0.2Vp-p
9.MIC volume check
• Set the PHRASE SELECT volume to the ‘4’ position.
• Verify that “TAP TEMPO” changes from red to green.
• Set the MIC volume to minimum, and gradually move it to maximum.
• Verify that the waveform increases smoothly.
•Rotate the MIC volume control and confirm that “PEAK” lights as shown
in the figure.
fig.p-mic_40
• Confirm that the same waveform as in the figure is produced when the
MIC volume control is at maximum.
fig.MIC_40
(0.5V/DIV, 1mS/DIV)
• Connect a noise meter to OUTPUT, and verify that the reading is in the
range of -1.0 dBm 1.5 dBm.
10.MUTE check
• Set the PHRASE SELECT volume to the ‘5’ position.
• Verify that “TAP TEMPO” is dark and “LOOP QUANTIZE” is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.MIC-Mut_40
(0.5V/DIV, 1mS/DIV)
• Connect a noise meter to OUTPUT, and verify that the reading is in the
range of -22.0 dBm 1.5 dBm.
Excessive level NG Insufficient level NG
(0.5V/DIV, 1mS/DIV) (0.5V/DIV, 1mS/DIV)
+DC NG(Asymmetrical:the upper
and lower sides)
-DC NG(Asymmetrical:the upper
and lower sides)
(0.5V/DIV, 1mS/DIV) (0.5V/DIV, 1mS/DIV)
↓
↑
2.4
Vpp
↓
↑
2.0
Vpp
Full lighting
Lighting Start

17
RC-20XL
11.AUX IN (NORMAL) check
• Set the PHRASE SELECT volume to the ‘6’ position.
• Verify that “LOOP QUANTIZE” is dark and “LOOP PHRASE” is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.NORMAL_40
(0.5V/DIV, 1mS/DIV)
0.6Vp-p 0.1Vp-p
12.AUX IN (FLAT AMP SIMULATE) check
• Set the PHRASE SELECT volume to the ‘7’ position.
• Verify that “LOOP PHRASE” is dark and “INST & MIC” is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.F-AMP_40
(0.5V/DIV, 1mS/DIV)
2.0Vp-p 0.2Vp-p
• Press the FS-5U that is connected to the REVERSE jack, and verify that
the waveform does not decrease.
13.AUX IN (CENTER CANCEL) check
• Set the PHRASE SELECT volume to the ‘8’ position.
• Verify that “INST & MIC” is dark and “NORMAL” is lit.
• Verify that there is no longer an output waveform.
14.AUX IN (L ch) check
• Set the PHRASE SELECT volume to the ‘9’ position.
• Verify that “NORMAL” is dark and “CENTER CANCEL” is lit.
• Input only the L channel to AUX IN.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.L-ch_40
(0.5V/DIV, 1mS/DIV)
1.8Vp-p 0.2Vp-p
15.solder spot check
• Set the PHRASE SELECT volume to the ‘10’ position.
• Verify that “CENTER CANCEL” is dark and “FLAT AMP SIMULATE”
is lit.
• Verify that there is no longer an output waveform.
• Set the PHRASE SELECT volume to the ‘11’ position.
• Verify that all LEDs are lit except for “PEAK.”
• Verify that the output waveform is the same waveform as shown in the
diagram.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p
16. PHRASE SELECT volume check
• Set the PHRASE SELECT control to the “10” position.
• Confirm that the FLAT AMP SIMULATE LED goes off.
• Set the PHRASE SELECT control to the “9” position.
• Confirm that the CENTER CANCEL LED goes off.
• Set the PHRASE SELECT control to the “8” position.
• Confirm that the NORMAL LED goes off.
• Set the PHRASE SELECT control to the “7” position.
• Confirm that the INST & MIC LED goes off.
• Set the PHRASE SELECT control to the “6” position.
• Confirm that the LOOP PHRASE LED goes off.
• Set the PHRASE SELECT control to the “5” position.
• Confirm that the LOOP QUANTIZE LED goes off.
• Set the PHRASE SELECT control to the “4” position.
• Confirm that the TAP TEMPO LED changes from red to orange.
• Set the PHRASE SELECT control to the “3” position.
• Confirm that the TAP TEMPO LED goes off.
• Set the PHRASE SELECT control to the “2” position.
• Confirm that the REVERSE LED goes off.
• Set the PHRASE SELECT control to the “1” position.
• Confirm that all LEDs other than the PEAK LED are lit.
• Confirm that the “POWER” indicator is lit.
17.Noise check
• Set the PHRASE SELECT volume to the ‘2’ position.
• Connect a 47k ohm short plug to the INST jack, a 150k ohm short plug
to the MIC jack, and a 1 k ohm stereo short plug to the AUX IN jack.
• Connect a monitor amp to OUTPUT.
• Set the INST volume and MIC volume to the maximum.
• Drop the unit from a height of 10 cm, and verify that no abnormal noise
is output.
• Turn the INST volume and MIC volume, and verify that no abnormal
noise is output.
• With the INST volume and MIC volume at the maximum positions,
measure the residual noise, and verify that it is less than -78 dBm (IHFA).
18.Battery operation check
• Put the battery in the battery compartment and insert the plug into the
OUTPUT jack.
• Verify that POWER is lit

18
Sep.2004
Always check the battery after repairing or servicing
the product.
Skipping directly to the desired test
• Enter Test mode.
• The FLASH ROM check will occur automatically, and if there is no
problem, all LEDs other than “PEAK” will light.
• Follow the procedure described in the section for the test you want to
perform.
In order to perform “5. GUIDE volume check,” you must
first perform “4. LEVEL volume check.”
Exiting Test mode
• Disconnect the plug from the ADAPTOR jack to turn off the power.
Cautions
After repairing or servicing the product, you must check all test items.

19
RC-20XL
BLOCK DIAGRAM
fig.block.eps
CN6
CN4CN5
+3.3V
DC/DC
CONVERTER
IC16
OUTPUT
REVERSE
PHRASE
SHIFT
SDRAM
IC1
CPU IC3
FLASH
MEMORY
IC6
RESET IC
IC6
SW LED
GATE ARRAY
IC4
IC10A IC15A IC15B
AUX IN
MIC
INST
IC9B
IC9A
IC12A IC12B
Q9
CENTER CANCEL FILTER
FLAT AMP FILTER
IC10B
Q12
AD/DA
IC14
IC13A IC13B
CN3
CN2
VR 1---3
PEAK LED16
INST
MIC VR5 VR4
CN1
CN1
BATTERY BOX
PANEL BOARD
JACK BOARD
WIRING P/N:G3487419 WIRING
P/N:G3487419
WIRING P/N:G3487163
WIRING P/N:G3477146

20
Sep.2004
CIRCUIT BOARD (PANEL)
fig.b-panel-1
fig.b-panel-2 View from components side
View from foil side