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