Roland RC-20 Operating and maintenance manual

RC-20 May. 2001
1
SERVICE NOTES
First Edition
Issued by RJA • Nominal Input Level
INPUT : -20 dBu (variable)
MIC : -40 dBu (variable)
AUX IN : -10 dBu
• Input Impedance
INPUT : 1M ohm
MIC: 1k ohm
AUX IN : 47k ohm
• Nominal Output Level
OUTPUT : -20 dBu
• Output Impedance
1k ohm
• Recommended Load
Impedance
10k ohm or greater
• Internal Memory
Recording Time : 5 min. 30 sec.
(max.)
10 loop phrases + 1 one-shot
phrase (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
PHRASE USED
MEMORY FULL
LOOP QUANTIZE
TAP TEMPO
REVERSE
WRITE
EXIT
AUTO START
INST & MIC
NORMAL
CENTER CANCEL
FLAT AMP SIMULATE
• Connectors
INST Jack
MIC Jack
AUX IN Jack (Stereo miniature
phone type)
PHRASE SHIFT Jack
REVERSE Jack
OUTPUT Jack
• Power
DC 9V : Dry battery (AA type)
x 6, AC Adaptor
• Power Consumption
85 mA (9 V max.)
* Expected battery life under con-
tinuous use:
Carbon : 9 hours
Alkaline : 25 hours
These figures will vary depend-
ing 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 7 oz (including
batteries)
• Accessories
Owner's Manual English
(#G6017294)
Dry battery <AA type> x 6
(#********)
Sound Library for RC-20 <Sam-
ple Phrase CD-ROM>
(#G2567113)
Sound Library for RC-20 <Sam-
ple Phrase CD LEAFLET>
(#G6017447)
• Options
AC Adaptor (PSA-series)
Foot Switch (FS-5U)
* 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.
SPECIFICATIONS
RC-20 : PHRASE RECORDER
Copyright 2001 ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.
17059083 Printed in Japan 900 (DP)
TABLE OF CONTENTS
SPECIFICATIONS ....................................................................................
LOCATION OF CONTROLS ....................................................................
EXPLODED VIEW ...................................................................................
PARTS LIST ............................................................................................
TEST MODE ............................................................................................
SERIAL DUMP AND UPDATE PROCEDURE .........................................
BLOCK DIAGRAM ...................................................................................
CIRCUIT BOARD (PANEL, JACK) ..........................................................
CIRCUIT DIAGRAM (PANEL) .................................................................
CIRCUIT DIAGRAM (JACK 1-16 LOT) ....................................................
CIRCUIT DIAGRAM (JACK 17 LOT up) ..................................................
CIRCUIT BOARD (CENTER) ..................................................................
CIRCUIT DIAGRAM (CENTER) ..............................................................
Page
.......................................................................................................... 1
........................................................................................................... 2
........................................................................................................... 3
........................................................................................................... 6
........................................................................................................... 8
......................................................................................................... 11
......................................................................................................... 13
......................................................................................................... 14
......................................................................................................... 16
......................................................................................................... 17
......................................................................................................... 18
......................................................................................................... 19
......................................................................................................... 20

RC-20 May. 2001
2
LOCATION OF CONTROLS
[Parts]
No. Part Code Part Name Q'ty
1 G2017146 CASE 1
2 G2187530 PEDAL R 1
3 G2187531 PEDAL L 1
4 G2357116 PEDAL PLATE 2
5 H5029851 PEDAL SHAFT 2
6 G2217133 PANEL 1
7 H5029850 HEXAGON SOCKET BUTTON HEAD SCREW M4x6 4
8 F3279802 POT. RD901-40-125F-B54-00D 2
9 F3279803 POT. RD901-40-125F-B54-11D 1
10 F3279805 POT. RD901-40-125F-AF5-00D 2
11 G2477122 R-KNOB 5
12 G247751001 KEYTOP S BLACK WITH LENS 4
13 G247751301 KEYTOP S WITHOUT LENS 2
14 G2217137 LED PANEL 1
15 1502928100 LED (RED) L-34HDSL 8
16 F5029125 LED (YELLOW) L-34YDSL 1
17 F5029124 LED (GREEN) L-34GDSL 2
18 15029342 LED (RED/GREEN) GL3ED8 1
19 F5029126 POWER LED L-113GDT 1
20 G2217135 REAR PANEL 1
21 F344940301 ADAPTOR JACK DJ-0711B-020 1
22 13449150MF 6.5MM JACK HTJ-064-12D 1
23 13449155MF 6.5MM JACK HTJ-064-12I 4
24 F3440404 MINI JACK AJ324A-3C 1
25 G2017621 BATTERY COVER 1
26 G2017148 BOTTOM COVER 1
27 G2357118 BOTTOM FOOT 2
28 F2539803 LABEL CAUTION 1
29 G2537848 QUICK MANUAL LABEL 1

RC-20 May. 2001
3
EXPLODED VIEW
[Parts]
No. Part Code Part Name Q'ty
1 G2017146 CASE 1
2 G2357111 CUSHION R 2
3 H5029851 PEDAL SHAFT 2
4 2215770201 PEDAL GUIDE BUSH 2
5 G2177104 SPRING 2
6 G2357116 PEDAL PLATE 2
7 G2357115 PEDAL FOOT 2
8 G2187530 PEDAL R 1
9 G2187531 PEDAL L 1
10 G2017148 BOTTOM COVER 1
11 G2357118 BOTTOM FOOT 2
12 G2017621 BATTERY COVER 1
13 G2017620 BATTERY CASE V6 1
14 G2177308 BATTERY TERMINAL(+) 1
15 G2177309 BATTERY TERMINAL(-) 1
16 G2177307 BATTERY TERMINAL(+/-) 1
17 G2257130 BATTERY INSULATING SHEET 1
18 F2539803 LABEL CAUTION 1
19 G2537848 QUICK MANUAL LABEL 1
21 G2477122 R-KNOB 5
22 G2257129 INSULATING SHEET CENTER 1
23 G2257131 INSULATING SHEET BOTTOM 1
24 G2217133 PANEL 1
25 G2217135 REAR PANEL 1
26 G2217137 LED PANEL 1
32 G247751301 KEYTOP S WITHOUT LENS 2
33 G247751001 KEYTOP S BLACK WITH LENS 4
43 G2197502 MINI JACK HOLDER 1
[Screws]
No. Part Code Part Name Q'ty
a H5019115 SCREW 3x8 PAN TAPPING-2 BZC 2
b H5019110 SCREW 3x6 PAN TAPPING-2 FEZC 13
c H5029850 SCREW M4x6 HEXAGON SOCKET BUTTON HEAD FENI 4
d 40011923 INTERNAL TOOTH WASHER M9.5x12.5x0.5 FENI 3
e 40016467 JACK WASHER M9.2x14x0.5 FENI 5
f 40123545 JACK NUT M9x11x2 NI 5
g H5029852 SCREW 4M3 HEXAGON SOCKET BUTTON HEAD FEBZC 2
h H5039413 NYLON WASHER M4.1x7.5x0.5 BLACK 2
i H5039414 NYLON WASHER M5.1x9.5x0.5 BLACK 2
j H5019430 SCREW 2.6x5 BINDING TAPTITE P FEZC 2
k H5039521 VR ACCESSORY NUT M7 5
m H5029325 SCREW 3x6 PAN HEAD TAPTITE-2 BZC 5
n H5039324 MINI JACK NUT M6 FENI 1
1
2
5
3
i
4
g
hRIGHT SIDE
LEFT SIDE
9
6
7
8

RC-20 May. 2001
4
EXPLODED VIEW
1
n
d
d
b
b
e
f
22
25
43
23
24
26
k
21
c
33
33
32
32

RC-20 May. 2001
5
EXPLODED VIEW
a
11
18
19
m
12
18
19
11
16
j
14
15
17
10
13
Align this part with
the edge surface.

RC-20 May. 2001
6
PARTS LIST
CASING Q'ty
G2017620 BATTERY CASE V6 1
G2017621 BATTERY COVER 1
G2017148 BOTTOM COVER 1
G2357118 BOTTOM FOOT 2
G2017146 CASE 1
# G2217137 LED PANEL 1
# G2217133 PANEL 1
G2187531 PEDAL L 1
G2357116 PEDAL PLATE 62x53 2
G2187530 PEDAL R 1
H5029851 PEDAL SHAFT 2
# G2217135 REAR PANEL 1
KNOB, BUTTON
G247751001 KEYTOP S BLACK WITH LENS 4
G247751301 KEYTOP S WITHOUT LENS 2
G2477122 R-KNOB 5
SWITCH
01780101 SKQKAB TACT SWITCH SW1,SW2,SW4,SW6-SW8 on PB 6
13129778 SKQKAH TACT SWITCH SW3,SW5 on PB 2
JACK, EXT TERMINAL
13449150MF HTJ-064-12D 6.5MM JACK (STEREO) JK7 on JB 1
13449155MF HTJ-064-12I 6.5MM JACK (MONO) JK1,JK2,JK4,JK5 on JB 4
# F3440404 AJ324A-3C MINI JACK JK3 on JB 1
F344940301 DJ-0711B-020 ADAPTOR JACK JK6 on JB 1
PWB ASSY
# 75D433M000 CENTER PWB ASSY (EXG) 1
# 75D433P001 PANEL PWB ASSY 1
NOTE : 'PANEL PWB ASSY' includes the following parts.
******** PANEL BOARD ASSY
******** JACK BOARD ASSY
IC
# 02780089 UPD703102GJ-33-W05 VER1.01 IC (CPU) IC1 on CB 1
# 02563023 TC58V64AFT IC (FLASH MEMORY) IC6 on CB 1
02451434 AK4552VT IC (AD/DA) IC5 on CB 1
02453389 LC32V4265T-25 IC (DRAM) IC4 on CB 1
02121556 LC24085B-SD1 IC (I/F) IC3 on CB 1
00346445 NJM2100M(TE3) IC (BIPOLAR OP AMP) IC2 on CB 1
15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC1 on PB. IC2,IC3,IC5,IC6 on JB 5
# 02458090 TC4066BFT(EL) IC (CMOS) IC1 on JB 1
15259118 TC4W66F(TE12L) IC (CMOS) IC4 on JB 1
15259884 TC7S08F(TE85L) IC (CMOS) IC8 on CB 1
01906156 S-8520E33MC-BJS-T2 IC (DC-DC REGULATOR) IC7 on JB 1
02455056 S-80930ALMP-DAT-T2 IC (RESET) IC7 on CB 1
TRANSISTOR
15319107 2SC4116-GR(TE85R) TRANSISTOR Q1,Q2 on PB. Q2 on JB 3
15329103T0 2SK880-GR(TE85R) FET TRANSISTOR Q1,Q11 on JB 2
# 02562867 IRF7606 TRANSISTOR Q10 on JB 1
E
15329521 RN1307(TE85R) TRANSISTOR Q1,Q2 on CB. Q3-Q7,Q12 on JB 8
15329533 RN2307(TE85R) TRANSISTOR Q3-Q10 on CB 8
DIODE
15339119T0 1SS352(TPH3) SWITCHING DIODE D1 on CB. D1-D8 on PB. D11,D12 on JB 11
01019534 1SS355 TE-17 SWITCHING DIODE D9 on JB 1
F5339137 SS14 VF=0.45V DIODE D3,D7 on JB 2
# 02562878 02DZ5.1-Y(TPH3) ZENER DIODE D9 on PB 1
15339120T0 1SS302(TE85R) DIODE ARRAY DA1-DA6 on JB 6
15029342 GL3ED8 LED (RED/GREEN) LED9 on PB 1
F5029126 L-113GDT POWER LED LED17 on PB 1
F5029117 L-312LRD LED (RED) LED4,LED12,LED14,LED15 on PB 4
F5029124 L-34GDSL LED (GREEN) LED2,LED10 on PB 2
1502928100 L-34HDSL LED (RED) LED3,LED5-LED8,LED11,
LED13,LED16 on PB 8
F5029125 L-34YDSL LED (YELLOW) LED1 on PB 1
RESISTOR
# F5399910 0 OHM CHIP RESISTOR (3216TYPE) C3 on JB 1
15399301 0 OHM CHIP RESISTOR (1608TYPE) C25,R45 on JB 2
# F5419716 CRN34103J CHIP RESISTOR RA2,RA7 on CB 2
# F5419715 CRN34680J CHIP RESISTOR RA1,RA3-RA6,RA8-RA12 on CB 10
00566867 RPC05T 100 J CHIP RESISTOR (1608TYPE) R16 on CB 1
00567023 RPC05T 101 J CHIP RESISTOR (1608TYPE) R7,R9,R10,R15,R17,R18,
R22,R23,R30 on CB 9
00567156 RPC05T 102 J CHIP RESISTOR (1608TYPE) R6 on PB R46,R60,R62 on JB 4
00567289 RPC05T 103 J CHIP RESISTOR (1608TYPE) R3,R5,R11,R12,R21,R27,R28,R29 on CB.
R2 on PB.
R1,R3,R11,R12,R15,R21,
R27,R42,R48,R50 on JB 19
00567412 RPC05T 104 J CHIP RESISTOR (1608TYPE) R3 on PB. R6,R13,R14,R47 on JB 5
00567556 RPC05T 105 J CHIP RESISTOR (1608TYPE) R5,R7 on PB. R2,R51 on JB 5
00567167 RPC05T 122 J CHIP RESISTOR (1608TYPE) R1 on PB 1
00567290 RPC05T 123 J CHIP RESISTOR (1608TYPE) R1 on CB. R31 on JB 2
00566890 RPC05T 150 J CHIP RESISTOR (1608TYPE) R20 on CB 1
00567178 RPC05T 152 J CHIP RESISTOR (1608TYPE) R24 on CB 1
00567301 RPC05T 153 J CHIP RESISTOR (1608TYPE) R2 on CB. R33,R58 on JB 3
00567067 RPC05T 221 J CHIP RESISTOR (1608TYPE) R6,R14 on CB 2
00567323 RPC05T 223 J CHIP RESISTOR (1608TYPE) R23,R26,R54,R56 on JB 4
00567334 RPC05T 273 J CHIP RESISTOR (1608TYPE) R8 on PB 1
00567089 RPC05T 331 J CHIP RESISTOR (1608TYPE) R4 on PB 1
00567367 RPC05T 393 J CHIP RESISTOR (1608TYPE) R40 on JB 1
00566967 RPC05T 470 J CHIP RESISTOR (1608TYPE) R26 on CB 1
00567245 RPC05T 472 J CHIP RESISTOR (1608TYPE) R8,R52 on JB 2
00567378 RPC05T 473 J CHIP RESISTOR (1608TYPE) R9,R10 on PB. R4,R5,R9,R10,R16-R20,
R22,R24,R25,R28,R29,R30,
R37,R39,R53,R55,R57 on JB 22
00567501 RPC05T 474 J CHIP RESISTOR (1608TYPE) R59,R61 on JB 2
00567389 RPC05T 563 J CHIP RESISTOR (1608TYPE) R4 on CB. R34,R35,R38,R41 on JB 5
00566990 RPC05T 680 J CHIP RESISTOR (1608TYPE) R8,R13 on CB 2
00567390 RPC05T 683 J CHIP RESISTOR (1608TYPE) R36 on JB 1
00567401 RPC05T 823 J CHIP RESISTOR (1608TYPE) R7 on JB 1
POTENTIOMETER
# F3279805 RD901-40-125F-AF5-00D POT. W/0 CLICK 250KA VR4,VR5 on PB 2
F3279802 RD901-40-125F-B54-00D POT. W/0 CLICK 50KB VR1,VR3 on PB 2
F3279803 RD901-40-125F-B54-11D POT. W/11 CLICKS 50KB VR2 on PB 1
CAPACITOR
# F5359345 0.027U CHIP CAPACITOR (1608TYPE) C6 on JB 1
F5367504 100/6.3V CHIP CAPACITOR C1,C3,C4,C24,C42,C46 on CB 6
F5369601 1/50V CHIP CAPACITOR C1,C2 on PB. C2,C5,C18,C39 on JB 6
01674167 ECUV1H100DCV CHIP CAPACITOR (1608TYPE) C15,C39,C40 on CB. C19,C33 on JB 5
01674278 ECUV1H470JCV CHIP CAPACITOR (1608TYPE) C34,C35 on CB 2
01674334 ECUV1H101JCV CHIP CAPACITOR (1608TYPE) C7,C12,C17,C36,C37 on JB 5
01674423 ECUV1H471JCV CHIP CAPACITOR (1608TYPE) C30,C31 on JB 2
01674567 ECJ1VB1H562K CHIP CAPACITOR (1608TYPE) C13,C44 on CB C14 on JB 3
01674612 ECJ1VB1H103K CHIP CAPACITOR (1608TYPE) C4,C8,C32 on JB 3
01674701 ECJ1VF1E104Z 0.1UF/16VK CHIP CAPACITOR (1608TYPE) C5-C12,C14,C16,C19,C21,C22,
C23,C25,C26,C27,C29,C31,C33,
C36,C37,C38,C41,C43,C47 on CB.
C3 on PB. C11,C28,C38 on JB 30
F5367503 47/6.3V CHIP CAPACITOR C26 on JB 1
SAFETY PRECAUTION:
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-15D
Failure to completely fill the above items with correct number and description will result in
delayed or even undelivered replacement.
The parts marked
# are new (initial
parts).
CB -> CENTER BOARD ASSY,
PB -> PANEL BOARD ASSY,
JK -> JACK BOARD ASSY

RC-20 May. 2001
7
F5367542 10/16V CHIP CAPACITOR C2,C20,C28,C30,C32 on CB.
C4-C9 on PB. C24,C34,C35 on JB 14
F5367546 100/16V CHIP CAPACITOR C18 on CB. C23,C29,C40 on JB 4
02341489 ECPU1C474MA5
MYLAR CAPACITOR(SUBMICRON) C10 on PB. C1,C9,C10 on JB 4
INDUCTOR, COIL, FILTER
F2449209 SLF7032T-151MR37-2(150UH) COIL L16 on JB 1
F2449210 SLF7032T-4R7M1R7-2(4.7UH) COIL L15 on JB 1
02563478 NFM4516P13C204F EMI FILTER C21 on JB 1
12449381 SBT-0460TF EMI FILTER L14 on JB 1
# 12449386 SBT-0180W EMI FILTER FL1 on JB 1
00903167 N2012Z601T02 FERRITE-BEAD (CHIP) L1-L7 on CB. L1-L10,L12,L13 on JB 19
CRYSTAL, RESONATOR
01899745 AT-41CD2 6.4MHZ CRYSTAL X3 on CB 1
00901912 MA-406 24.576MHZ TE24 CRYSTAL X2 on CB 1
CONNECTOR
F3439160 53015-0210 2P P=2MM CONNECTOR CN6 on JB 1
# F3439165 A2001WR2-10P CONNECTOR CN3 on CB 1
# F3439166 A2001WR2-11P CONNECTOR CN2 on CB 1
# F3439167 A2001WR2-14P CONNECTOR CN1 on CB 1
# F3439164 A2001WR2-8P CONNECTOR CN1 on JB 1
WIRING, CABLE
G3477146 3P L=40x5x5 MM P=2MM RIBBON CABLE CN3 on JB to CN4 on JB 1
# G3487222 WIRING 8P CN3 on PB to CN1 on JB 1
# G3487221 WIRING 10P CN1 on PB to CN3 on CB 1
# G3487220 WIRING 11P CN2 on PB to CN2 on CB 1
# G3487219 WIRING 14P CN2 on JB to CN1 on CB 1
G3487163 WIRING BATTERY L=80MM 2P 1
SCREWS
H5019430 SCREW 2.6x5 BINDING HEAD TAPTITE P FEZC 2
H5019110 SCREW 3x6 PAN HEAD TAPTITE-2 FEZC 12
H5029325 SCREW 3x6 PAN HEAD TAPTITE-2 BZC 5
H5019115 SCREW 3x8 PAN HEAD TAPTITE-2 BZC 2
H5029850 SCREW M4x6 HEXAGON SOCKET BUTTON HEAD FENI 4
H5029852 SCREW 4M3 HEXAGON SOCKET BUTTON HEAD FEBZC 2
40123545 JACK NUT M9x11x2 NI 5
40016467 JACK WASHER M9.2x14x0.5 FENI 5
H5039521 VR ACCESSORY NUT M7 5
H5039413 NYLON WASHER M4.1x7.5x0.5 BLACK 2
H5039414 NYLON WASHER M5.1x9.5x0.5 BLACK 2
40011923 WASHER M9.1x13 INTERNAL TOOTH 2
H5039324 MINI JACK NUT M6 FENI 1
PACKING
# G2567114 CD PACKAGE 1
G2607212 PACKING CASE LOWER 1
# G2627136 PACKING CASE UPPER 1
H2679505 POLYETHYLENE BAG 220x340x0.03 1
G2237614 REAR PAD 1
G2237613 SIDE PAD 1
MISCELLANEOUS
G2257130 BATTERY INSULATING SHEET 1
G2177309 BATTERY TERMINAL(-) 1
G2177308 BATTERY TERMINAL(+) 1
G2177307 BATTERY TERMINAL(+/-) 1
G2357111 CUSHION R 2
G2257131 INSULATING SHEET BOTTOM 1
G2257129 INSULATING SHEET CENTER 1
F2539803 LABEL CAUTION FCC/CE/C-TICK/EMC 1
02123845 LEAF A 2
G2197126 LED GUIDE 1
H2369427 LED SPACER H=8MM 8
# G2197502 MINI JACK HOLDER 1
G2357115 PEDAL FOOT M8 2
2215770201 PEDAL GUIDE BUSH 2
# G2537848 QUICK MANUAL LABEL 1
# F2259116 SHIELD COVER 1
# F2259117 SHIELD SHEET 1
# G2177104 SPRING 2
ACCESSORIES (Standard)
# G6017295 OWNER'S MANUAL JAPANESE 1
# G6017294 OWNER'S MANUAL ENGLISH 1
# G2567113 CD-ROM SAMPLE DATA 1
# G6017447 CD MANUAL 1
40232334 WARRANTY CARD (JAPAN ONLY)

RC-20 May. 2001
8
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. CN2 solder spot check
16. Noise check
17. Battery operation check
Note : Test items 7.to15. also include a PHRASE SELECT volume
check.
Items required for tests
• Oscillators x 2
• Oscilloscope
• Noise meter
• Monitor amp
• FS-5U x 2
• 1k ohm stereo short plug
• 150 ohm short plug
• 47k ohm short plug
• J-5
• Stereo mini <-> monaural phone conversion cable
Entering test mode
• Set all volumes to minimum.
• While holding down the left pedal (REC/PLAY/OVERDUB) and right
pedal (STOP/TAP TEMPO), connect the adaptor to the ADAPTOR
JACK to turn 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.
Note : 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.
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
Note : 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 ver-
sion number will be indicated by the LEDs.
Internal ROM version number display
This is indicated by the four LEDs "FLAT AMP SIMULATE", "CEN-
TER 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 seven LEDs: "REVERSE", "TAP
TEMPO", "WRITE", "EXIT", "AUTO START", "MEMORY FULL",
and "LOOP QUANTIZE."
"REVERSE" only lit : Ver1.00
"TAP TEMPO" only lit : Ver1.01
"WRITE" only lit : Ver1.02
"EXIT" only lit : Ver1.03
"AUTO START" only lit : Ver1.04
"MEMORY FULL" 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.
• Press the REVERSE switch.
• Verify that "REVERSE", "PLAY", "OVERDUB", and "PHRASE
USED" 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 that is connected to the PHRASE SHIFT jack, and ver-
ify that "MEMORY FULL" goes dark.
• Press the FS-5U that is connected to the REVERSE jack, and verify that
all LEDs other than "PEAK" light.

RC-20 May. 2001
9
Excessive level NG Insufficient level NG
(0.5 V/DIV, 1 mS/DIV) (0.5 V/DIV, 1 mS/DIV)
+DC NG -DC NG
(0.5 V/DIV, 1 mS/DIV) (0.5 V/DIV, 1 mS/DIV)
6. DA check
• Once again check the output waveform at the point that "5. GUIDE vol-
ume 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 'maximum.'
• Set the PHRASE SELECT volume to the '2' position.
• Verify that "OVERDUB" and "REVERSE" are lit.
• Verify that the output waveform is as shown in the diagram.
Note : The waveform will change slightly depending on the inac-
curacy 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.
4. LEVEL volume check
• Connect your waveform measurement equipment as shown in the dia-
gram below. Connect your oscilloscope to OUTPUT.
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.
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.
(0.5 V/DIV, 1 mS/DIV)
200 Hz, 2.2 Vp-p ± 0.2 Vp-p
(0.5 V/DIV, 1 mS/DIV)
200 Hz, 2.2 Vp-p ± 0.2 Vp-p
(0.5 V/DIV, 1 mS/DIV)

RC-20 May. 2001
10
(0.5 V/DIV, 1 mS/DIV)
1.2 Vp-p ± 0.2 Vp-p
(0.5V/DIV, 1mS/DIV)
(0.5V/DIV, 1mS/DIV)
• 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.
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.
• Verify that "PEAK" lights as shown in the diagram.
• Verify that when MIC volume is at maximum, the waveform is the
same as shown in the diagram.
• 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.
• Connect a noise meter to OUTPUT, and verify that the reading is in the
range of -22.0 dBm +/- 1.5 dBm.
11.AUX IN (NORMAL) check
• Set the PHRASE SELECT volume to the '6' position.
• Verify that "LOOP QUANTIZE" is dark and "PHRASE USED" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
12.AUX IN (FLAT AMP SIMULATE) check
• Set the PHRASE SELECT volume to the '7' position.
• Verify that "PHRASE USED" is dark and "INST & MIC" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
• 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.
Note : If the waveform remains, it is possible that the CENTER
CANCEL section is NG, or that there is a spot of solder on
the connector.
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.
Note : Verify that when compared with the output waveform of
"12. AUX IN (FLAT AMP SIMULATE) check," the phase
is inverted.
(0.5V/DIV, 1mS/DIV)
0.6Vp-p ± 0.1Vp-p
(0.5V/DIV, 1mS/DIV)
2.0Vp-p ± 0.2Vp-p
(0.5V/DIV, 1mS/DIV)
1.8Vp-p ± 0.2Vp-p
(The start illuminating of the LED indication.)
(The LED indication will stay illuminated.)

RC-20 May. 2001
11
15.CN2 solder spot check
• Set the PHRASE SELECT volume to the '10' position.
• Verify that "CENTER CANCEL" is dark and "FLAT AMP SIMU-
LATE" is lit.
• Verify that there is no longer an output waveform.
Note : If the waveform remains, it is possible that there is a spot of
solder between pins 1-2 or 2-3 of CN2.
• 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.
16.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 (IHF-
A).
17.Battery operation check
• Put the battery in the battery compartment and insert the plug into the
INPUT jack.
• Check that power is turned on.
• Check that the unit is operating normally.
Note : Always check the battery after repairing or servic-
ing 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.
Note : In order to perform "5. GUIDE volume check," you must
first perform "4. LEVEL volume check."
Note : Even if it is not immediately after entering Test mode, you
can select the desired test item in the same way whenever all
LEDs other than "PEAK" are lit.
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.
SERIAL DUMP AND
UPDATE PROCEDURE
The following data can be transmitted and received between two RC-20
units without using any other devices.
1. Program
The operating program is stored in CPU ROM, but some processing can
be altered by applying patches.
This corresponds to such patch data.
2. Guide sound
3. Phrases (1 - 11)
Procedure
1. Connect the transmitting RC-20 and the receiving RC-20 as follows.
Connect the REVERSE jack and PHRASE SHIFT jack respectively.
Transmitting RC-20 Receiving RC-20
REVERSE ----------> PHRASE SHIFT
PHRASE SHIFT ----------> REVERSE
2. Start up the transmitting RC-20 in Dump mode.
1)While holding down the [TAP TEMPO] and [AUTO START] buttons,
turn on the power of the transmitting RC-20.
2)[EXIT] and the [FLAT AMP SIMULATE] and [REC] [PLAY]
[OVERDUB] indicators will light.
3. Start up the receiving RC-20 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-20.
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-20
1)Press the [TAP TEMPO] button to select the data that you want to send.
[TAP TEMPO] indicator
Dark : Program, Guide sound, All phrases
Green : Specified phrase
Red : Guide sound
Orange : Program
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-20.
Transmission will begin when you press the left pedal of the transmit-
ting RC-20.
When the [MODE] indicators of both the transmitting RC-20 and the
receiving RC-20 stop at "FLAT AMP SIMULATE," transmission/
reception has been completed.
* With the factory settings, transmitting the program, guide sound, and all
phrases will require approximately 15 minutes.
Note : Never turn off the power until transmission/reception has
been completed.
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p ± 0.2Vp-p

RC-20 May. 2001
12
State of the transmitting RC-20
"FLAT AMP SIMULATE" Waiting to transmit
* The RC-20 will briefly be in this state between data items.
* Since the guide sound data is divided into two parts, the RC-20 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-20
"FLAT AMP SIMULATE" Waiting for reception
* The RC-20 will briefly be in this state between data items.
* Since the guide sound data is divided into two parts, the RC-20 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.
6. Repeat steps 4. -- 5. as necessary.
7. Turn off the power when you are finished.

RC-20 May. 2001
13
BLOCK DIAGRAM
RC-20 Block Diagram
BATTERY
BOX
CN6
CN3CN4
+3.3V
DC/DC
CONVERTER
IC7
OUTPUT
REVERSE
PHRASE
SHIFT
AUX IN
CENTER
CANCEL
FILTER
FLAT AMP
FILTER
MIC
INST
CN1
CN2
JACK BOARD (75D433P001 2/2)
CN1
AD/DA
IC5
DRAM
IC4
CPU
IC1
FLASH
MEMORY
IC6
RESET IC
IC7
CENTER BOARD (75D433M000)
CN2 CN3
CN3
CN2 CN1
PANEL BOARD (75D433P001 1/2)
SW LED
GATE ARRAY
IC3
MIC VR
VR5
VR
INST VR
VR4
POWER LED
LED17
PEAK LED
LED16
IC5A IC6A IC6B
IC3A
IC3B
IC2A
IC2B
Q1
IC2AIC2B

RC-20 May. 2001
14
CIRCUIT BOARD (PANEL, JACK)
View from component side

RC-20 May. 2001
15
CIRCUIT BOARD (PANEL, JACK)
View from foil side

RC-20 May. 2001
16
CIRCUIT DIAGRAM (PANEL)
CENTER
CANCEL
PLAY
FLAT_AMP
SIM
(green)
REC
INST
GUIDE LEVEL
EXIT
WRITE
MODE
MIC
TAP
TEMPO
PEDAL_L
REVERSE
POWER
REVERSE
(red )
PEDAL_R
AUTO
START
PEAK
EXIT
OVER
DUB
LOOP
QUANTIZE
PHRASE
SELECT
AUTO
START
PHRASE
USED
NORMAL
INST
MIC
MEMORY
FULL
WRITETAP
TEMPO
TO CN2 ON
CENTER
BOARD
TO CN1 ON
JACK
BOARD
PEAK LED
POWER LED
MIC I N
MIC OUT
INST O UT
INST IN
75D433P000 1/2
*1: 0.47/16S = Submicron Chip Capacitor
*1
75D433P001 1/2
*1LOT-16LOT
*17LOT-
PANEL BOARD ASSY
AN11
AN10
AN12
+
D 3. 3
D
AVcc
A
AVcc
AA
AVcc
A+
D 3. 3
D
AVcc
A
DA
C4
10/16
+
-
IC1A
M5218AF
2
3
1
R8
27k
R5 1M
+
-
IC1B
M5218AF
6
5
7
R6
1k R7 1M C5
10/16
D8
1SS352
SW6
SKQKAB
1 2
D4
1SS352
D1 1SS352
SW2
SKQKAB
1 2
SW1
SKQKAB
1 2
D2
1SS352
SW4
SKQKAB
1 2
VR2
RD901-40-125F-B54-11D (50KB 11clicks)
1
2
3
VR5
RD901-40-125F-AF5-00D (250KA)
1
2
3
LED4
L-312LRD
1 2
SW3
SKQKAH
1 2
D3 1SS352
SW5
SKQKAH
1 2
D5 1SS352
LED17
L-113GDT
12
VR4
RD901-40-125F-AF5-00D (250KA)
1
2
3
LED5
L-34HDSL
1 2
LED6
L-34HDSL
1 2
LED7
L-34HDSL
1 2
LED12
L-312LRD
1 2
LED11
L-34HDSL
1 2
LED3
L-34HDSL
1 2
VR1
RD901-40-125F-B54-00D (50KB)
1
2
3
C6
10/16
D7 1SS352
VR3
RD901-40-125F-B54-00D (50KB)
1
2
3
LED16
L-34HDSL
1 2
R1
1.2k
LED15
L-312LRD
1 2
LED8
L-34HDSL
1 2
LED1
L-34YDSL
1 2
LED9
GL3ED8
1 2
3
LED2
L-34GDSL
1 2
LED10
L-34GDSL
1 2
LED14
L-312LRD
1 2
LED13
L-34HDSL
1 2
R4
330
C9
10/16
R9
47k
C8
10/16 R10
47k
D9
02DZ5.1-Y
1 2
+
-
IC1C
M5218AF
84
Q2
2SC4116GR
1
2 3
R2
10k
R3
100k
Q1
2SC4116GR
1
2 3
C2
1/50
C1
1/50
CN1
WIRING 10P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
CN2
WIRING 11P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
C3
0.1
D10
N.I.U.
1 2
C10
0.47/16S
C7
10/16
CN3
WIRING8P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
SW7
SKQKAB
1 2
D6
1SS352
SW8
SKQKAB
1 2

RC-20 May. 2001
17
CIRCUIT DIAGRAM (JACK 1-16 LOT)
INST
MIC
AUX_IN
*1: 0.47/16S = Submicron Chip Capacitor
REVERSE
PHASE
SHIFT
TO CN1 ON
CENTER BOARD
OUTPUT
INST OUT
INST IN
TO CN3 ON
PANEL BOARD
POWER LED
PEAK LED
MIC IN
MIC OUT
INST OUT
INST IN
*1
*2
*4 *4
MIC IN
MIC OUT
0 ohm(3216 Type):2 LOT - 16 LOT
*2: No Mounting
*3: Jamper Wire:1 LOT
*4: 0 ohm(1608 Type):1 LOT - 16 LOT
or HSJ0857-01-1210
*1
*1
*1
*1
*3
*2
*2
*2
75D433P000 2/2
JACK BOARD ASSY
DA_R
DA_L
FET SW
FLAT_AMP_ON/OFF
REVERSE
AUX_C.CANCEL_MUTE
MIC_MUTE
T_SHIFT
AUX_NORM_MUTE
INST_MUTE
A
1/2AVcc
1/2AVcc
A
A
AVcc
1/2AVcc
A
1/2AVcc
AVcc
A
A
AVcc
AVcc
A
1/2AVcc
A
A
A
A
AVcc
A
A
A
AVcc
A
1/2AVcc
D
D
D
D
D
+
D 3. 3
D
AVcc
+
D 3. 3
1/2AVcc
A
A
AVcc
A
AVcc
A
AVcc
AVcc
AVcc
A
AVcc
A
AVcc
A
A
+
D 3. 3
D
D
+
D 3. 3
1/2AVcc
D
1/2AVcc
AVcc
A
D
1/2AVcc
A
A
A
D
D
A
A
AVcc
A
AVcc
AVcc
R1
10k
R2
1M
JK3
AJ324A-3C
1
2
3
R28
47K
R23
22K
R26
22K
R29
47K
R24
47K
L1
N2012Z601T2
L6
N2012Z601T2
R12
10k
R47
100k
C24
10/16 R46 1k
C5
1/50
JK7
HTJ-064-12D
1
2
3
C21
NFM4516P13C204F
C23
100/16
C26
47/6.3
R48
10k
+
-
IC6B
M5218AF
6
5
7
R33
15k
C20
N.I.U
R34
56k
R37
47k
+
-
IC5A
M5218AF
2
3
1
R39
47k
R41
56k
C13
N.I.U
R11
10k
C3
0
L3
N2012Z601T2
+
-
IC2C
M5218AF
84
+
-
IC6C
M5218AF
84
IC1E
TC4066BFT
14
7
C10
0.47/16S
+
-
IC3B
M5218AF
6
5
7+
-
IC5B
M5218AF
6
5
7
R27
10K
C1
0.47/16S
R36
68k
C25
0
Q9
N.I.U
1
2 3
R45
0
Q8
N.I.U
1
32
D6
N.I.U
12
R43
N.I.U
D5
N.I.U
12
C27
N.I.U
D4
N.I.U
1 2
R44
N.I.U
R49
N.I.U
R15
10k Q2
2SC4116GR
1
2 3
C8
0.01
R13
100k
R8
4.7k C6 0.027
L8
N2012Z601T2
L10
N2012Z601T2
C17
100P
CN4
RIBON3P
11
22
33
CN3
RIBON 3P
1
12
23
3
IC7
S-8520E33MC-BJS
ON/OFF
1
VIN
5
VSS
2
EXT 4
VOUT 3
C29
100/16 C28 0.1
L15
SLF7032T-4R7M1R7-2 4.7uH
C19
10p
L16
SLF7032T-151MR37-2 150uH
R40
39k
+
-
IC6A
M5218AF
2
3
1
R35
56k
C14
0.0056
R31
12K
R38
56k
CN6
53015-0210
11
22
IC1D
TC4066BFT
11 10
12
IC1C
TC4066BFT
8 9
6
IC4B
TC4W66F
5 6
3
DA1
1SS302
21
3
DA2
1SS302
21
3
DA4
1SS302
21
3
DA5
1SS302
21
3
DA6
1SS302
21
3
+
-
IC5C
M5218AF
84
Q1
2SK880GR
3
1 2
L13
N2012Z601T2
L2
N2012Z601T2
L9
N2012Z601T2
L12
N2012Z601T2
L7
N2012Z601T2
L14
SBT-0460TF
R6
100k
C4
0.01
JK1
HTJ-064-12I
2
4
1
JK2
HTJ-064-12I
2
4
1
JK6
DJ-0711-020
3
1
2
JK4
HTJ-064-12I
2
4
1
Q10
IRF7606
D7
G
4D5
S
2
D6 S
3
S
1D8
D7
SS14
1 2
D3
SS14
1 2
+
-
IC3A
M5218AF
2
3
1
C30
470p
C31
470p
CN2
WIRING 14P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
C18
1/50
C12
100P
IC1B
TC4066BFT
4 3
5
+
-
IC2A
M5218AF
2
3
1
+
-
IC2B
M5218AF
6
5
7
R19
47k
R9
47k
Q6
RN1307
1
2 3
R16
47k
C7 100p
R17
47k R18 47k
R14
100k
Q7
RN1307
1
2 3
R5 47k
IC1A
TC4066BFT
1 2
13
Q4
RN1307
1
2 3
Q3
RN1307
1
2 3
C2
1/50 R4 47k
Q5
RN1307
1
2 3
R10
47k
R20
47k
R50
10k
FL1
SBT-0180W
1
2
4
3
IC4A
TC4W66F
1 2
7
R25
47K
R30
47K
C11
0.1
R7
82k
Q11
2SK880GR
3
1 2
D9
1SS355
1 2
R51
1M
Q12
RN1307
1
2 3
R53
47k
JK5
HTJ-064-12I
2
4
1
R52
4.7k
R3
10k
CN1
A2001WR2-8P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
+
-
IC3C
M5218AF
84
C33
10p
R55
47k
R21
10K
DA3
1SS302
21
3
R22
47K
C9
0.47/16S
L5
N2012Z601T2
R54
22k
C34
0.47/16S
R57
47k
R56
22k
C35
0.47/16S
C36
100p
C37
100p
R58
15k
C39
1/50
R42
10k
C22
N.I.U
IC4C
TC4W66F
8
4
C32
0.01
D11
1SS352
12
D12
1SS352
12
C40
100/16
C38
0.1
L4
N2012Z601T2

RC-20 May. 2001
18
CIRCUIT DIAGRAM (JACK 17 LOT up)
INST
MIC
AUX_IN
*1: 0.47/16S = Submicron Chip Capacitor
REVERSE
PHASE
SHIFT
TO CN1 ON
CENTER BOARD
OUTPUT
INST OUT
INST IN
TO CN3 ON
PANEL BOARD
POWER LED
PEAK LED
MIC IN
MIC OUT
INST OUT
INST IN
*2
*2
MIC IN
MIC OUT
*2: No Mounting
or HSJ0857-01-1210
*1
*1
*1
75D433P001 2/2
JACK BOARD ASSY
DA_R
DA_L
FET SW
FLAT_AMP_ON/OFF
AUX_C.CANCEL_MUTE
MIC_MUTE
T_SHIFT
AUX_NORM_MUTE
INST_MUTE
REVERSE
A
1/2AVcc
1/2AVcc
A
A
AVcc
1/2AVcc
A
1/2AVcc
AVcc
A
A
AVcc
AVcc
A
1/2AVcc
A
A
A
A
AVcc
A
1/2AVcc
D
D
D
D
D
+
D 3. 3
D
AVcc
+
D 3. 3
1/2AVcc
A
A
AVcc
A
AVcc
A
AVcc
AVcc
AVcc
A
AVcc
A
AVcc
A
A
+
D 3. 3
D
D
+
D 3. 3
1/2AVcc
D
1/2AVcc
AVcc
A
D
1/2AVcc
A
A
A
D
D
A
A
AVcc
A
AVcc
AVcc
+
D 3. 3
+
D 3. 3
R1
10k
R2
1M
JK3
AJ324A-3C
1
2
3
R28
47K
R23
22K
R26
22K
R29
47K
R24
47K
L1
N2012Z601T2
L6
N2012Z601T2
R12
10k
R47
100k
C24
10/16 R46 1k
C5
1/50
JK7
HTJ-064-12D
1
2
3
C21
NFM4516P13C204F
C23
100/16
C26
47/6.3
R48
10k
+
-
IC6B
M5218AF
6
5
7
R33
15k
C20
N.I.U
R34
56k
R37
47k
+
-
IC5A
M5218AF
2
3
1
R39
47k
R41
56k
C13
N.I.U
R11
10k
L3
N2012Z601T2
+
-
IC2C
M5218AF
84
+
-
IC6C
M5218AF
84
IC1E
TC4066BFT
14
7
C10
0.47/16S
+
-
IC3B
M5218AF
6
5
7+
-
IC5B
M5218AF
6
5
7
R27
10K
C1
0.47/16S
R36
68k
R15
10k Q2
2SC4116GR
1
2 3
C8
0.01
R13
100k
R8
4.7k C6 0.027
L8
N2012Z601T2
L10
N2012Z601T2
C17
100P
CN4
RIBON3P
11
22
33
CN3
RIBON 3P
1
12
23
3
IC7
S-8520E33MC-BJS
ON/OFF
1
VIN
5
VSS
2
EXT 4
VOUT 3
C29
100/16 C28 0.1
L15
SLF7032T-4R7M1R7-2 4.7uH
C19
10p
L16
SLF7032T-151MR37-2 150uH
R40
39k
+
-
IC6A
M5218AF
2
3
1
R35
56k
C14
0.0056
R31
12K
R38
56k
CN6
53015-0210
11
22
IC1D
TC4066BFT
11 10
12
IC1C
TC4066BFT
8 9
6
IC4B
TC4W66F
5 6
3
DA1
1SS302
21
3
DA2
1SS302
21
3
DA4
1SS302
21
3
DA5
1SS302
21
3
DA6
1SS302
21
3
+
-
IC5C
M5218AF
84
Q1
2SK880GR
3
1 2
L13
N2012Z601T2
L2
N2012Z601T2
L9
N2012Z601T2
L12
N2012Z601T2
L7
N2012Z601T2
L14
SBT-0460TF
R6
100k
C4
0.01
JK1
HTJ-064-12I
2
4
1
JK2
HTJ-064-12I
2
4
1
JK6
DJ-0711-020
3
1
2
JK4
HTJ-064-12I
2
4
1
Q10
IRF7606
D7
G
4D5
S
2
D6 S
3
S
1D8
D7
SS14
1 2
D3
SS14
1 2
+
-
IC3A
M5218AF
2
3
1
C30
470p
C31
470p
CN2
WIRING 14P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
C18
1/50
IC1B
TC4066BFT
4 3
5
+
-
IC2A
M5218AF
2
3
1
+
-
IC2B
M5218AF
6
5
7
R19
47k
R9
47k
Q6
RN1307
1
2 3
R16
47k
C7 100p
R17
47k R18 47k
R14
100k
Q7
RN1307
1
2 3
R5 47k
IC1A
TC4066BFT
1 2
13
Q4
RN1307
1
2 3
Q3
RN1307
1
2 3
C2
1/50 R4 47k
Q5
RN1307
1
2 3
R10
47k
R20
47k
R50
10k
FL1
SBT-0180W
1
2
4
3
IC4A
TC4W66F
1 2
7
R25
47K
R30
47K
C11
0.1
R7
82k
Q11
2SK880GR
3
1 2
D9
1SS355
1 2
R51
1M
Q12
RN1307
1
2 3
R53
47k
JK5
HTJ-064-12I
2
4
1
R52
4.7k
R3
10k
CN1
A2001WR2-8P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
+
-
IC3C
M5218AF
84
C33
10p
R55
47k
R21
10K
DA3
1SS302
21
3
R22
47K
C9
0.47/16S
L5
N2012Z601T2
R54
22k
C34
10/16
R57
47k
R56
22k
C35
10/16
C36
100p
C37
100p
R58
15k
C39
1/50
R42
10k
IC4C
TC4W66F
8
4
C32
0.01
D11
1SS352
12
D12
1SS352
12
C40
100/16
C38
0.1
L4
N2012Z601T2
R60
1K
R62
1K
R61
470k
C12
100P
R59
470k
+
-
+
-

RC-20 May. 2001
19
CIRCUIT BOARD (CENTER)
View from component side View from foil side

RC-20 May. 2001
20
CIRCUIT DIAGRAM (CENTER)
(fc=32k)
TO CN2 ON
JACK BOARD
TO CN2 ON
PANEL
BOARD
TO CN1 ON
PANEL
BOARD
AUX_C.CANCEL_MUTE
FLAT_AMP_ON/OFF
AUX_NORM_MUTE
INST_MUTE
MIC_MUTE
CENTER BOARD ASSY
75D433M000
XLWR
XRD
A9
CD_RE
DMARQ1
A6
CD4
DMARQ0
CD_RB
A9
A4
A4
CD3
CD_ALE
CD1
CD5
DMARQ0
CD_RE
CD_WP
CD_CLE
CD_ALE
A3
A7
A7
A5
A4
CD4
A1
CD8
A2
CD7
CD1
A6
CD_RB
CD3
A5
A2
A3
A1
A9
A8
CD2
CD6
A1
A6
A3
CD2
CD7
A2
CD_WE
A5
A8
A7
A8
CD_CLE
CD_WE
DMARQ1
CD6
CD5 CD8
D6
D14
D15
D12
D2
D1
D3
D3D0
D13
D7
D7
D13
D5
D2
D11
D14
D0
D4
D4
D11
D12
D5
D6
D15
D1
D0
D1
D2
D3
D4
D5
D6
D7
D11
D12
D13
D14
D15
CD_CE
CD_CE
DA_L
D10
D9
D9
D8
D10
D9
D8 D10
D8
T_SHIFT_INC
FET SW
FET SW T_SHIFT_INC
DA_R
CD_SW
CD_PRTCT
CD_WP
DMAAK0
DMAAK1
DMAAK0
DMAAK1
P104
P104
T_SHIFT
P107
REVERSE
REVERSE
P105
REVERSE
P106
P106
P107
P105
P103
P103
FET SW
+
D 3. 3
+
D 3. 3
D
D
D
D
+
D 3. 3
D
D
+
D 3. 3
+
D 3. 3
D
D
+
D 3. 3
D
D
D
D
D
D
A
+
D 3. 3
D
+
D 3. 3
+
D 3. 3
D
D
A
A
D
+
D 3. 3
+
D 3. 3
A
A
+
D 3. 3
D
D
D
D
D
+
D 3. 3
D
+
D 3. 3
+
D 3. 3
D
+
D 3. 3
D
+
D 3. 3
+
D 3. 3
D
D
+
D 3. 3
D
+
D 3. 3
A
X3
AT-41CD2 (6.4MHz)
1 2
C42
100/6.3
C4 100/6.3C3100/6.3
C22
0.1 C23 0.1
CN4
N.I.U.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
C16
0.1
C39
10p
C14
0.1
C9
0.1
C1
100/6.3
C5
0.1
C11
0.1
C28
10/16
C12
0.1
C6
0.1
C10
0.1
C32
10/16
IC5
AK4552VT
LIN
2
SDTO 8
RIN
1
VD
5MCLK 11
BCLK 12
PDN 13
DEM1 7
VCOM
14
LRCK 10
VSS
3
SDTI 9
DEM0 6
VA
4
ROUT 16
LOUT 15
R19
1M
D1
1SS352
12
C34 47p
C35 47p
R20
15
C13
0.0056
R4
56k
R1
12k
R2
15k
C17
N.I.U
R3
10k
R5
10k
+
-
IC2B
NJM2100M
6
5
7
C20
10/16
+
-
IC2A
NJM2100M
2
3
1
R11
10k
R12
10k
C210/16
IC4 LC32V4265T-25
VCC 6
I/O1 2
I/O2 3
I/O3 4
I/O4 5
VCC 22
I/O5 7
I/O6 8
I/O7 9
I/O8 10
NC
13
NC
14
WE
15 RAS
16
NC
17
A0
18 A1
19 A2
20 A3
21 A4
24 A5
25 A6
26 A7
27 A8
28
OE
29
UCAS
30 LCAS
31
NC
32
I/O9 35
I/O10 36
I/O11 37
I/O12 38
VSS 23
I/O13 40
I/O14 41
I/O15 42
I/O16 43
VSS 44
VSS 39
VCC 1
L2
N2012Z601T2
L3
N2012Z601T2
L1N2012Z601T2
R23
100
L6 N2012Z601T2
C30
10/16
C44 0.0056
S-80930ALMP-DAT-T2
IC7
NC
4
Cp 5
VDD
2
VSS
3
OUT 1
IC6
TC58V64AFT
NC
39
NC
38
NC
37
NC
36
NC 35
GND
40
NC 32
NC 31
NC 30
NC 29
NC 28
I/O8
27
I/O7
26
I/O6
25
I/O5
24
RE
42
R/B
41 WP
5
WE
4
NC 15
NC 14
NC 13
NC 17
I/O4
21
I/O3
20
I/O2
19
I/O1
18
NC 10
Vss 1
CLE
2
ALE
3NC 6
NC 7
NC 8
NC 9
NC 16
Vss 22
Vccq 23
CE
43
Vcc 44
X1
N.I.U.
12
L4
N2012Z601T2
L7
N2012Z601T2
L5
N2012Z601T2
IC3
LC24085B-SD1
LCD_DATA1 66
LCD_DATA0 67
LCD_POWER_U/D 59
LCD_DATA5 62
LCD_DATA4 63
LCD_DATA2 65
LCD_DATA3 64
EXTAL
93
XP_CLK
56
SPRX_LRCK
44
SPRX_BCK
45
PRESET_CTRL 58
VDD 18 VDD 37
WCK_IN
43
VSS
1VSS
19 VSS 36 VSS 55
CPU_WR
27 CPU_RD
28 CPU_CS
29 XP_CS_IN
30
PLL_LOCK
38
S1
39
S2
40
PLL_SEND
41
WAIT_CA
47
AR_SYNC_WCK
42
XP_WCK
50
XTAL
92
LCD_DATA6 61
LCD_DATA7 60
LCD_E 68
LCD_R/W 69
LCD_RS 70
ENC_A 110
ENC_B 111
7SEG_COM0 112
7SEG_COM1 113
7SEG_COM2 114
7SEG_COM3 115
7SEG_COM4 105
7SEG_DATA7 123
7SEG_DATA6 122
7SEG_DATA5 121
7SEG_DATA4 120
7SEG_DATA3 119
7SEG_DATA2 118
7SEG_DATA1 117
7SEG_DATA0 116
TEST 97
LRCK 104
BCK 103
MCK 102
DAOUT1 101
ADIN1 100
DAOUT0 99
ADIN0 98
DATA8 86
DATA6 94
DATA5 95
DATA4 89
DATA7 88
DATA2 85
DATA1 84
DATA3 87
SW 96
PROTECT 76
WE 81
CE 78
RE 80
ALE 79
WP 83
A9
26
A8
25
D7
7
D6
6
D5
5
D4
4
D3
142
D2
141
D1
140
D0
139
A7
24
A6
23
A5
22
A4
21
A3
20
A2
17
A1
16
A19
131
A18
130
D15
15
D14
14
D13
13
D12
12
D11
11
D10
10
D9
9
D8
8
PHAI
32
RESET
33
SPRX_SD
46
WAIT_CB
48
XP_SCK
51
XP_LRCLK
49
XP_SD
52
XP_WR
53
VDD 54
VSS
72
VDD 73
CLE 77
VDD 90
VSS
91 VSS
108 VDD 126
VSS
127
XCD_POWER
129 XCS
128
WAIT_OUT
125
CPU_TIMER
124
DMA_REQ0
132 DMA_REQ1
133 DMA_REQ2
134 DMA_ACK0
135 DMA_ACK1
136 DMA_ACK2
137
INT_OUT
138
VDD 144 VDD 109
NC 2
NC 3
NC 34
NC 35
NC 71
NC 74
NC 75
NC 106
NC 107
NC 143
SM_CS_IN
31
R/B 82
PLL_RETURN
57
RA1CRN34680J
1 8
2 7
3 6
4 5
RA3CRN34680J
1 8
2 7
3 6
4 5
RA4CRN34680J
1 8
2 7
3 6
4 5
RA5CRN34680J
1 8
2 7
3 6
4 5
RA7
CRN34103J
1 8 2 7 3 6 4 5
RA12 CRN34680J
1 8
2 7
3 6
4 5
C15
10p
C18
100/16
C19
0.1
X2
MA-406 (24.576MHz)
14
RA11
CRN34680J
1 8
2 7
3 6
4 5
R13
68
RA6 CRN34680J
1 8
2 7
3 6
4 5
RA8 CRN34680J
1 8
2 7
3 6
4 5
C260.1
C270.1
C250.1
RA2
CRN34103J
1 8 2 7 3 6 4 5
CN2
A2001WR2-11P
11
22
33
44
55
66
77
88
99
10 10
11 11
R6 220 R7 100
R9 100
R10
100
R14 220
R15 100
R17 100 R18 100
CN3
A2001WR2-10P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
R22 100
RA10
CRN34680J
1 8
2 7
3 6
4 5
RA9
CRN34680J
1 8
2 7
3 6
4 5
R8 68
TP1 TP 1
IC1
UPD703102GJ-33
DMARQ0
4DMARQ1
3DMARQ2
2
TO100/P00
8TO101/P01
7
P03
5
P02
6
AVREF 36
AVDD 34
AVSS 35
VDD 45
CVDD 62
INTP103
1
RESET
71
HVDD 100 HVDD 126
VDD 144
VSS
9
VSS
83
VSS
117
VSS
135
WR 88
RD 89
UWR 90
LWR 91
CS7 92
CS6 93
CS5 94
CS4 95
CS3 96
CS2 97
CS1 98
RAS0 99
MODE3 70
MODE2 69
MODE1 68
MODE0 67
CVSS 65
CKSEL 66
X2 63
X1 64
P17 / INTP113
10
P16 / INTP112
11
P15 / INTP111
12
P14 / INTP110
13
P13
14
P12
15
P11
16
P10
17
P107
18
P106
19
P105
20
P104
21
P103
22
P102
23
P101
24
P100
25
ANI7
26
ANI6
27
ANI5
28
ANI4
29
ANI3
30
ANI2
31
ANI1
32
ANI0
33
P20/NMI
37
P21
38
SO0
39
SI0
40
SCK0
41
TXD1
42
RXD1
43
P27
44
P37
46
P36
47
P35
48
P34
49
P33
50
TCLR13/P32
51
TO131/P31
52
TO130/P30
53
P117
54
P116
55
P115
56
P114
57
P113
58
P112
59
P111
60
P110
61
P127
72
P126
73
P125
74
P124
75
P123
76
P122
77
P121
78
P120
79
CLKOUT/PX7
80
PX6/WAIT
81
PX5
82
P97
84
P96
85
P95
86
P94
87
A15 109
A14 110
A13 111
A12 112
A11 113
A10 114
A9 115
A8 116
D7 136
D6 137
D5 138
D4 139
D3 140
D2 141
D1 142
D0 143
A7 118
A6 119
A5 120
A4 121
A3 122
A2 123
A1 124
A0 125
A23 101
A22 102
A21 103
A20 104
A19 105
A18 106
A17 107
A16 108
D15 127
D14 128
D13 129
D12 130
D11 131
D10 132
D9 133
D8 134
R24
1.5k
Q2
RN1307
1
23
Q3
RN2307
1
32
C37
0.1
C40
10p
R21
10K
C41
0.1
C8 0.1
C21
0.1
C31
0.1
C36
0.1
C70.1
C43
0.1
C38
0.1
C24
100/6.3
Q1
RN1307
1
23
Q5
RN2307
1
32
Q6
RN2307
1
32
Q7
RN2307
1
32
Q8
RN2307
1
32
Q9
RN2307
1
32
Q10
RN2307
1
32
Q4
RN2307
1
32
R25
N.I.U.
C45
N.I.U.
C46
100/6.3
R26
47
IC8
TC7S08F
1
2
4
53
C47
0.1
TP3
TP 1
R27
10k
R28
10k
TP2 TP
1
R29
10k
TP17 TP
1
TP4 TP
1
TP5 TP
1
TP6 TP
1
TP7 TP
1
TP8 TP
1
TP9 TP
1
TP10 TP
1
TP11 TP
1
TP12 TP
1
TP16 TP
1
TP13 TP
1
TP14 TP
1
TP15 TP
1
TP18 TP
1
CN1
A2001WR2-14P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
R30 100
R16
10
C33
0.1
C29
0.1
+
-
IC2C
NJM2100M
84
+3.3V
+3.3V