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Roland GC-408 Service Notes
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Roland GC-408 Service Notes

Guitar amp
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See also: Owner's Manual
Dec, 1997
GC-408/GC-408S
GC-408 : GUITAR amplifier
gc-408s : speaker box

TABLE OF CONTENTS

SPECIFICATIONS•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••1
PANEL LAYOUT •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••2
EXPLODED VIEW
GC-408 CABINET •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••3
GC-408S CABINET •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••4
CHASSIS••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••5
NOTICE •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••6
WIRING DIAGRAM•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••7~10
PARTS LIST •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••11,12
CIRCUIT BOARD ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••13
CIRCUIT DIAGRAM •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••14
Copyright c 1997 by ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission of
ROLAND CORPORATION.
17059906
GC-408/GC-408S
SPECIFICATIONS
GC-408:Guitar Amplifier
Rated Power Output
Issued by RJA
60 W/8 Ω
80 W/4 Ω (When the speaker box GC-408 is connected.)
Nominal Input Level ( @ 1 kHz )
CLEAN Channel
Page
LEAD Channel
Speakers
20 cm ( 8 inches) x 4
Controls
CHANNEL SELECT Switch
CLEAN Channel
LEAD Channel
EQUALIZER
MASTER
Indicator
CLEAN Channel
LEAD Channel
Connectors
INPUT Jack(HIGH,LOW)
FOOT SWITCH Jack(CHANNEL, SELECT, BOOST, REVERB)
EFFECT SEND Jack
EFFECT RETURN Jack
EXTERNAL SP OUT Jack
Power Supply
100V(50Hz/60Hz),117V,230V or 240V
Power Consumption
60W(AC 100V) / 80W(117V/230V/240V)
Dimensions
561 (W)x 316 (D)x 576 (H) mm
22-1/8 (W) x 12-1/2 (D) x 22-11/16 (H) inches
Weight
20.6 kg / 45 lbs 7 oz
Accessories
Owner's Manual English
Owner's Manual Japanese
Options
Footswitch FS-5L(BOSS)
External speaker box GC-408S
Printed in Japan (CR) AD00 1
GC-408S:Speaker Box
Speakers
20 cm ( 8 inches) x 4
Rated Input
80 W
INPUT HIGH -36 dBm / 680k Ω
INPUT LOW -26 dBm / 100k Ω
Impedance
INPUT HIGH -65 dBm / 680k Ω
8 Ω
INPUT LOW -55 dBm / 100k Ω
0 dBm = 0.775 Vrms
Connector
INPUT Jack
Dimensions
561 (W)x 335 (D)x 528 (H) mm
22-1/8 (W) x 13-3/16 (D) x 20-13/16 (H) inches
BRIGHT Switch
Weight
VOLUME Knob
16.6 kg / 36 lbs 10 oz
BOOST Switch
PRE VOLUME Knob
Accessories
POST VOLUME Knob
Owner's Manual English
BASS Knob
Owner's Manual Japanese
MIDDLE Knob
Connection Cable
TREBLE Knob
(EXT S/P CABLE)
REVERB Knob
PRESENCE Knob
LOW CUT Switch
SQUEEZE LEVEL Switch
POWER SQUEEZER Switch
POWER Switch (w/Indicator)
(SS000103)
(SS000104)
(SS000105)
(SS000106)
(SS000155)

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Summary of Contents for Roland GC-408

  • Page 1: Table Of Contents

    Speakers Issued by RJA 60 W/8 Ω 20 cm ( 8 inches) x 4 80 W/4 Ω (When the speaker box GC-408 is connected.) gc-408s : speaker box Rated Input Nominal Input Level ( @ 1 kHz ) 80 W INPUT HIGH -36 dBm / 680k Ω...
  • Page 2 GC-408/GC-408S Dec, 1997 LOCATION OF CONTROLS [PARTS] GC-408 [FRONT VIEW] Part Cord Part Name SS000115 PHONE JACK MONO 12.5M/M SS000055 NUT BK ABS JACK SS000065 BUTTON PNBB-18 SS000020 PUSH SWITCH JDPA-21SA e~i SS000066 KNOB CNBB-09 SS000011 POTENTIOMETER A50k V/R 16F...

  • Page 3: Gc-408 Cabinet

    Dec, 1997 GC-408/GC-408S GC-408 CABINET EXPLODED VIEW [PARTS] No. Part Cord Part Name SS000139 CABINET ASSY SS000070 CORNER CSN-03 SS000160 RUBBER FOOT RF-02 SS000076 HANDLE HDBK-02 SS000077 HANDLE BRACKET HBNI-02 17055028 REVERB UNIT 8DB2C1E SS000135 SPEAKER GC-408/S SS000167 ANGLE BRACKET SS000050 TAPPING SCREW NI TH1 3.5x12...

  • Page 4: Gc-408S Cabinet

    SS000160 RUBBER FOOT RF-02 SS000076 HANDLE HDBK-02 SS000077 HANDLE BRACKET HBNI-02 * * * * * * * * SS000135 SPEAKER GC-408/S SS000167 ANGLE BRACKET SS000050 TAPPING SCREW NI TH1 3.5x12 SS000140 CABINET ASSY GC-408S SS000145 TAPPING SCREW BK TH1 3.5x 18 Replacement CABINET ASSY includes the following parts.
  • Page 5 Dec, 1997 GC-408/GC-408S CHASSIS EXPLODED VIEW [PARTS] No. Part Cord Part Name SS000112 CHASSIS (FOR 100V/230V/230VE/240V VERSION) SS000113 CHASSIS (FOR 117V VERSION) SS000141 PANEL(Front / Rear) SS000128 POWER TRANSFORMER GC-408J 100V SS000129 POWER TRANSFORMER GC-408U 117V SS000130 POWER TRANSFORMER GC-408ES 230V...

  • Page 6: Chassis

    GC-408/GC-408S Dec, 1997 NOTICE Some basic tips to keep in mind when you replace a component 2. Reverb unit Reverb unit is placed to cabinet directly by wood screw. 1. Caution labels When you place a reverb unit to the new replacement cabinet, When you replace the chassis, place caution labels to the lock it in specified position.

  • Page 7: Wiring Diagram

    Dec, 1997 GC-408/GC-408S WIRING DIAGRAM IMPORTANT NOTE ! (For 117V version) When you replace the AC Switch for 117V version, basic safety precations should always be followed including the following. (Refer to fig 1.) NOTE : Mounting of AC Switch The switch cover must be secured to the ac switch by nylon tie.
  • Page 8 GC-408/GC-408S Dec, 1997 WIRING DIAGRAM 408 SPEAKER...
  • Page 9 Dec, 1997 GC-408/GC-408S WIRING DIAGRAM 408S SPEAKER...

  • Page 10: Parts List

    GC-408/GC-408S Dec, 1997 WIRING DIAGRAM WIRING DIAGRAM PARTS LIST NOTE:The parts marked have safety-related characteristics. Use only listed parts for replacement. * * * * * * * * TRANSFORMER SEC.LEAD WIRE.(RED) * * * * * * * * TRANSFORMER SEC.LEAD WIRE.(BLK)
  • Page 11 Dec, 1997 GC-408/GC-408S GC-408 PARTS LIST RESISTOR SS000125 RESISTOR RS TYPE 220ohm/2W 26222000506 R13,89 SS000124 CEM RES. RWC5 TYPE 0.33ohm/5W 26030000806 R55-57 CONSIDERATIONS ON PARTS ORDERING SAFETY PRECAUTIONS:*2 POTENTIOMETER When ordering any parts listed in the parts list, please specify the following items in the order sheet.
  • Page 12 NOTE3:Replacement BACK BOARD includes the following parts. SS000168 BACK PLATE 90140000001 For BACK BOARD JACK SS000115 PHONE JACK MONO 12.5M/M JK10 SPEAKER SS000135 SPEAKER GC-408/S 40160908034 WIRING,CABLE SS000183 SPEAKER WIRE (BLK) SS000196 SPEAKER SYSTEM WIRE (WHT) SS000197 SPEAKER SYSTEM WIRE (BLK) SS000198 SPEAKER WIRE (WHT)

  • Page 13: Circuit Board

    Dec, 1997 GC-408/GC-408S CIRCUIT BOARD CHANGE INFORMATION The PCB ASSY has reviced from the 2nd lot. There is no difference in circuit structure. (The following diagram is effective for 1st lot. Until Serial No.ZK21099.) SERVICE RESPONCE Unnecessary since the circuit structure...

  • Page 14: Circuit Diagram

    GC-408/GC-408S Dec, 1997 CIRCUIT DIAGRAM...

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