Roland WP-20G 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) (AS)
17058016E0
Feb.2002 WP-20G(T)
SPECIFICATINS................................................................2
LOCATION OF CONTROLS ..........................................4
LOCATION OF CONTROLS PARTS LIST ...................5
EXPLODED VIEW............................................................6
EXPLODED VIEW............................................................8
EXPLODED VIEW PARTS LIST.....................................9
PARTS LIST......................................................................10
IDENTIFYING VERSION NUMBER ...........................14
TEST MODE.....................................................................14
Block Diagram.................................................................18
Circuit Board (JACK BOARD) ......................................20
Circuit Board (JACK BOARD) ......................................21
Circuit Diagram (JACK BOARD) .................................22
Circuit Board (PANEL BOARD)...................................24
Circuit Diagram (PANEL BOARD)..............................25

2
Feb.2002
SPECIFICATINS
WP-20G: GK Effect
Controls
Master On/Off Pedal
Effects On/Off Pedal
TYPE Knob
COLOR Knob
LEVEL Knob
MODE Knob
EFFECT LEVEL Knob
NORMAL PU MIX Switch
Indicator
POWER Indicator (serves also as battery check indicator)
MASTER ON/OFF Indicator
EFFECTS ON/OFF Indicator
Connectors
GUITAR OUT Jack
GUITAR RETURN Jack
GK IN Connector
OUTPUT Jack
DC IN Jack (DC 9 V)
Nominal Input Level
GUITAR RETURN: -20 dBu
Input Impedance
GUITAR RETURN: 1 M(ohm)
Nominal Output Level
OUTPUT: -20 dBu
GUITAR OUT: -20 dBu
Nominal Output Impedance
OUTPUT: 1 k(ohm)
GUITAR OUT: 100 (ohm)
Recommended Load Impedance
10 k(ohm) or greater
Residual Noise Level
• 96 dBu(GK IN: terminated, Distortion: OFF, NORMAL PU MIX: OFF,
IHF-A,typ)
Power Supply
DC 9 V: Dry Battery x 6, AC Adaptor
Current Draw
150 mA (9 V, with GK-2A)
* Expected battery life under continuous use:
Carbon: 2 hours
Alkaline: 6 hours
These figureswill 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
Dry Battery (LR6 (AA) type) x 6(#********)
Owner’s Manual English (#G6017300)
Japanese (#G6017299)
Roland Service (Information sheet)
Options
AC Adaptor: PSA series
Divided pickup: GK-2A (Roland)
Unit Selector: US-20 (Roland)
GK Connecting Cable: GKC-3 (3 m), GKC-5 (5 m), GKC-10 (10 m), C-13B(10 m)
(Roland)
GK Parallel Box: GKP-4 (Roland)
* 0 dBu = 0.775 Vrms
* In the interest of product improvement, the specifications and/or appearrance of
this unit are subject to change without prior notice.

3
WP-20G(T)

4
Feb.2002
LOCATION OF CONTROLS
fig.panel-h
q w
i u y t
a
b
e
c
!4
!2
!3
b
o !0 !1
r
!7 !5
!8
!6

5
WP-20G(T)
LOCATION OF CONTROLS PARTS LIST
[Parts]
[Screw]
No. Part Code Part Name Q’ty
1 F344940301 ADAPTOR JACK DJ-0711B-020 1
2 G2017146 CASE 1
3 G2017148 BOTTOM COVER 1
3 G2357118 BOTTOM FOOT 2
3 G2017621 BATTERY COVER 1
3 G2537726 LABEL 1
4 13449155MF PHONE JACK (MONO) HTJ-064-12I 2
5 G2217150 REAR PANEL 1
6 00564556 DIN TCS5093-10-4152 1
7 F3159104 SWITCH SS037-P222BHH-PE9 1
8 13449150MF PHONE JACK (STEREO) HTJ-064-12D 1
9 G2477122 R-KNOB 1
F3279804 POTENTIOMETER 6 CLICKS 50KB RD901-40-125F-B54-06D 1
10 G2217146 PANEL 1
11 G2477122 R-KNOB 1
F3279803 POTENTIOMETER 11 CLICKS 50KB RD901-40-125F-B54-11D 1
12 G2477122 R-KNOB 3
F3279802 POTENTIOMETERNO CLICK 50KB RD901-40-125F-B54-00D 3
13 F5029126 POWER LED L-113GDT 1
14 G2357116 PEDAL PLATE 62X53 2
15 G2187530 PEDAL R 1
16 G2217153 LED PANEL 1
17 G2187531 PEDAL L 1
18 1502928100 LED (RED) L-34HDSL 2
No. Part Code Part Name Q’ty
a H5019125 SCREW M3X10 PAN HEAD W/SW+PW FE BC 2
b H5029850 SCREW M4X6 HEXAGON SOCKET BUTTON HEAD FE 4
c H5029851 PEDAL SHAFT 2

6
Feb.2002
EXPLODED VIEW
fig.panel-h
x5
x4
x5
21
c
k
24
26
x3
d
x7
x2
x3
x3
23
f
e
n
b
25
28
27
1

7
WP-20G(T)
1
2
5
3
i
4
g
hRIGHT SIDE
LEFT SIDE
9
6
7
8

8
Feb.2002
EXPLODED VIEW
fig.panel-h
a
11
18
m
12 18
11
16
j
14
15
17
10
13

9
WP-20G(T)
EXPLODED VIEW PARTS LIST
[Parts]
[Screw]
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 215-702 2
5 2217710900 COIL SPRING 214-109 2
6 G2357116 PEDAL PLATE 62X53 2
7 G2357115 PEDAL FOOT M8 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 1
14 G2177308 BATTERY TERMINAL(+) 1
15 G2177309 BATTERY TERMINAL(-) 1
16 G2177307 BATTERY TERMINAL(+-) 1
17 G2257130 BATTERY INSULATING SHEET 1
18 G2537726 LABEL 1
21 G2477122 R-KNOB 5
23 G2257131 INSULATING SHEET BOTTOM 1
24 G2217146 PANEL 1
25 G2217150 REAR PANEL 1
26 G2217153 LED PANEL 1
27 75D4820000 JACK BOARD ASSY 1
26 75D4830200 PANEL BOARD ASSY 1
No. Part Code Part Name Q’ty
a H5019115 SCREW M3X8 PAN TAPPING-2 FEBZC 2
b H5019110 SCREW M3X6 PAN TAPPING-2 FEZC 7
c H5029850 SCREW M4X6 HEXAGON SOCKET BUTTON HEAD FE 4
d H5039205 WASHER 12.5X9.5X0.5/0.9 INTERNAL TOOTH FENI 3
e H5039112 WASHER M9 3
f H5039510 NUT M9X12X2 FENI 3
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 5
m H5019115 SCREW M3X8 PAN TAPPING-2 FEBZC 5
n H5019125 SCREW M3X10 PAN HEAD W/SW+PW FE BC 2

10
Feb.2002
PARTS LIST
fig.part1e
JB -> JACK BOARD ASSY, PB -> PANEL BOARD ASSY
CASING
G2357116 PEDAL PLATE 62X53 2
G2017620 BATTERY CASE 1
G2017621 BATTERY COVER 1
G2017148 BOTTOM COVER 1
G2357118 BOTTOM FOOT 2
G2017146 CASE 1
# G2217153 LED PANEL 1
# G2217146 PANEL 1
G2187531 PEDAL L 1
G2187530 PEDAL R 1
H5029851 PEDAL SHAFT 2
G2217150 REAR PANEL 1
KNOB,BUTTON
G2477122 R-KNOB 5
SWITCH
13129778 SKQKAH TACT SWITCH SW1, SW2 on Panel Board 2
F3159104 SS037-P222BHH-PE9 SWITCH SW1 on Jack Board 1
JACK,EXT TERMINAL
13449150MP HTJ-064-12D PHONE JACK (STEREO) JK2 on Jack Board 1
13449155MF HTJ-064-12I PHONE JACK (MONO) JK1, JK3 on Jack Board 2
00564556 TCS5093-10-4152 DIN CN1 on Jack Board 1
F344940301 DJ-0711B-020 ADAPTOR JACK JK4 on Jack Board 1
PWB ASSY
# 75D4820000 JACK BOARD ASSY 1
# 75D4830200 PANEL BOARD ASSY 1
IC
02455056 S-80930ALMP-DAT-T2 IC (RESET) IC8 on Jack Board 1
02122423 AN78L07M-E1 IC (REGULATOR) IC11 on Jack Board 1
02124634 AN79L07M-E1 IC (REGULATOR) IC9 on Jack Board 1
00458034 TC75S51F TE85R IC (OP AMP) IC7 on Jack Board 1
01906156 S-8520E33MC-BJS-T2 IC (DC-DC REGULATOR) IC12 on Jack Board 1
02568567 MB3778PFV IC (DC-DC CONVERTER) IC10 on Jack Board 1
15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC1 on Jack Board 1
02451434 AK4552VT IC (AD/DA) IC2, IC3, IC6 on Jack Board 3
# 02569812 MN101C30A VER.1.00 IC (8BIT CPU) IC4 on Jack Board 1
02568578 MN101C427BL VER.1.00 IC (8BIT CPU) IC5 on Jack Board 1
TRANSISTOR
F5309111 2SA1182Y TRANSISTOR Q15, Q18 on Jack Board 2
15309104 2SA1586-GR(TE85R) TRANSISTOR Q10, Q11 on Jack Board 2
15319108 2SC-3324GR-TE85R TRANSISTOR
Q2, Q4, Q5, Q6, Q8, Q9, Q12, Q21 on Jack Boa
8
F5319104 2SC2859Y TRANSISTOR Q19 on Jack Board 1
15319107 2SC4116-GR(TE85R) TRANSISTOR Q13 on Jack Board 1
15329521 RN1307(TE85R) TRANSISTOR Q7, Q22 on Jack Board 3
F5139608 IRF7606 POWER MOS FET Q16 on Jack Board 1
15329103 2SK880GR-TE85R FET TRANSISTOR Q1, Q3, Q20 on Jack Board 2
DIODE
02562878 02DZ5.1-Y(TPH3) ZENER DIODE D2 on Jack Board 1
01019534 1SS355 TE-17 SWITCHING DIODE D1, D4, D9, D10 on Jack Board 4
F5029126 L-113GDT POWER LED LED3 on Panel Board 1
SAFETY PRECAUTIONS:
The parts marked have
safety-relatedcharacteristics.Use
only listed parts for replacement.
SAFETY PRECAUTIONS:
The parts marked have safety-related characteristics. Use only listed parts for replacement.
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)