Roland JC-120 User's Manual
Contents
1. manual should be read in its entirety The manual should be saved and kept on hand as a convenient reference Copyright 1996 ROLAND CORPORATION All rights reserved No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN A A ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS QUVRIR CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the product INSTRUCTIONS PERTAINING TO A RISK OF FIRE ELECTRIC SHOCK OR INJURY TO PERSONS IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS WARNING When using electric products basic precautions should always be followed including the following 1 Read all the instructions before using the product Do not use this product near water for example near a bathtub washbowl kitchen sink in a wet basement2. or near a swimming pool or the like 3 This product should be used only with a cart or stand that is recommended by the manufacturer This product either alone or in combination with an amplifier and headphones or speakers may be capable of producing sound levels that could cause permanent hearing loss Do not operate for a long period of time at a high volume level or at a level that is uncomfortable If you experience any hearing loss or ringing in the ears you should consult an audiologist 5 The product should be located so that its location or position does not interfere with its proper ventilation 6 The product should be located away from heat sources such as radiators heat registers or other products that produce heat 7 The product should be connected to a power supply only of the type described in the operating instructions or as marked on the product N A 8 The power supply cord of the product should be unplugged from the outlet when left unused for a long period of time 9 Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings 10 The product should be serviced by qualified service personnel when A The power supply cord or the plug has been damaged or B Objects have fallen or liquid has been spilled onto the product or C The product has been exposed to rain or D The product does not appear to operate normally or exhibits a marked change
3. the total power used by all devices you have connected to the extension cord s outlet must never exceed the power rating watts amperes for the extension cord Excessive loads can cause the insulation on the cord to heat up and eventually melt through with your dealer or qualified Roland service e Before using the unit in a foreign country consult personnel A CAUTION Always grasp only the plug on the power supply cord when plugging into or unplugging from an S outlet Try to prevent cords and cables from becoming entangled Also all cords and cables should be placed so they are out of the reach of children If the unit could become a hazard if it moves all caster wheels should be removed once the unit has been placed at the place of installation or has been loaded onto a vehicle Never climb on top of nor place heavy objects on the unit S hands when plugging into or unplugging from Never handle the power cord or its plug with wet S an outlet plug from the outlet and pull out all cords from Before moving the unit disconnect the power lt external devices Before cleaning the unit turn off the power and unplug the power cord from the outlet p 5 Z Whenever you suspect the possibility of lightning in your area pull the plug on the power cord out Z of the outlet IMPORTANT NOTES In addition to the items listed under IMPORTANT SAFETY INSTRUCTIONS and USING THE UN
4. IT SAFELY on pages 2 and 3 please read and observe the following P P ower Supply Do not use this unit on the same power circuit with any device that will generate line noise such as an electric motor or variable lighting system Before connecting this unit to other devices turn off the power to all units This will help prevent malfunctions and or damage to speakers or other devices lacement Using the unit near power amplifiers or other equipment containing large power transformers may induce hum To alleviate the problem change the orientation of this unit or move it farther away from the source of inter ference This device may interfere with radio and television reception Do not use this device in the vicinity of such receivers Do not expose the unit to direct sunlight place it near devices that radiate heat leave it inside an enclosed vehicle or otherwise subject it to temperature extremes Excessive heat can deform or discolor the unit This unit contains powerful magnets If placed in the vicinity of TVs it may cause interference irregularities in color Should this occur reposition this unit so it is located at a greater distance from such devices Maintenance For everyday cleaning wipe the unit with a soft dry cloth or one that has been slightly dampened with water To remove stubborn dirt use a cloth impregnated with a mild non abrasive detergent Afterwards be sure to wipe the unit thoroughly
5. Roland GUITAR AMPLIFIER JAZZ CHORUS JC 120 Owner s Manual Thank you for purchasing the Roland JC 120 JAZZ CHORUS Guitar Amplifier To take full advantage of this amplifier and to ensure years of trouble free service please read this Owner s Manual in its entirety Features e 120 watts of output power 2 channels of 60 watts each Channel 2 is equipped with Roland s renowned chorus effect e Two input jacks high gain and low gain accommodate virtually any guitar Both channels contain a Bright switch for greater tonal control e A three spring reverb unit produces a warm distinctive sound e The reinforced cabinet is designed to withstand the rigors of the road while providing characteristic styling e Chorus Vibrato Reverb and Distortion can all be controlled by foot switches leaving your hands free for playing e Channel 2 contains an effects loop circuit that allows you to select either a series or parallel connection Further it provides selection of a 4 dBm or 20 dBm input level to match the level of your effects device Before using this unit carefully read the sections entitled IMPORTANT SAFETY INSTRUCTIONS p 2 USING THE UNIT SAFELY p 3 and IMPORTANT NOTES p 4 These sections provide important information concerning the proper operation of the unit Additionally in order to feel assured that you have gained a good grasp of every feature provided by your new unit this
6. ents use the LOW input 2 BRI Bright Switch When this switch is set to ON a bright clear sound can be obtained 3 VOLUME Knob Clockwise rotation will increase the amplifier s overall volume 4 TREBLE Control Knob Clockwise rotation will boost the higher frequencies 5 MIDDLE Control Knob Clockwise rotation will boost the all important middle frequencies 6 BASS Control Knob Clockwise rotation will boost the lower frequencies 7 DISTORTION Knob Clockwise rotation will intensify the distortion effect OFF turns the effect off 8 REVERB Knob Clockwise rotation will intensify the reverb effect 9 Vibrato SPEED Knob This knob adjusts the rate frequency of the sound vibrations of the vibrato effect Clockwise rotation increases the vibrato speed 10 Vibrato DEPTH Knob This knob adjusts the depth of the vibrato effect Clockwise rotation deepens the vibrato effect 11 VIB OFF CHORUS Switch This knob selects the Chorus or Vibrato effect When it is set to the OFF position neither effect will be obtained Neither the speed nor depth of the Chorus effect can be changed 6 7 8 9 10 11 12 13 12 Pilot Lamp This will light when the amplifier is switched on 13 POWER Switch This switch turns the amplifier on and off To prevent malfunction and or damage to speakers or other devices always turn down the volume and turn off the power on all devices before making any connec
7. in performance or E The product has been dropped or the enclosure damaged 11 Do not attempt to service the product beyond that described in the user maintenance instructions All other servicing should be referred to qualified service personnel For the USA GROUNDING INSTRUCTIONS This product must be grounded If it should malfunction or breakdown grounding provides a path of least resistance for electric current to reduce the risk of electric shock This product is equipped with a cord having an equipment grounding conductor and a grounding plug The plug must be plugged into an appropriate outlet that is properly installed and grounded in accordance with all local codes and ordinances DANGER Improper connection of the equipment grounding conductor can result in a risk of electric shock Check with a qualified electrician or serviceman if you are in doubt as to whether the product is properly grounded Do not modify the plug provided with the product if it will not fit the outlet have a proper outlet installed by a qualified electrician For the U K WARNING THIS APPARATUS MUST BE EARTHED IMPORTANT THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE GREEN AND YELLOW EARTH BLUE NEUTRAL BROWN LIVE As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The wire which is col
8. ng Caster Wheels The caster wheels were not attached at the factory To attach or remove them do as shown in the illustration gt aq Q gt S 9 i Specifications Rated Power output Speakers Power Supply Power Consumption Nominal Input Level Connectors Controls Dimensions Weight Accessories Options 120 W 60 W 60 W 82 8Q 30 cm 12 inches 30 cm 12 inches AC 117 V AC 230 V or AC 240 V 110 W 117 V 230 V 230 VE 240 VA 30 dBm 680kQ 0 dBm 0 775 V CH 1 Input Jacks HIGH LOW CH 2 Input Jacks HIGH LOW FOOT SWITCH Jacks CHORUS VIBRATO REVERB and DISTORTION CH 2 EFFECT LOOP SEND Jack CH 2 EFFECT LOOP RETURN Jacks L MONO R LINE OUT Jacks L MONO R CH 1 BRI Bright Switch VOLUME Knob TREBLE Control Knob MIDDLE Control Knob BASS Control Knob CH 2 BRI Bright Switch VOLUME Knob TREBLE Control Knob MIDDLE Control Knob BASS Control Knob DISTORTION Knob REVERB Knob Vibrato SPEED Knob Vibrato DEPTH Knob VIB OFF CHORUS Switch POWER Switch CH 2 EFFECT LOOP Switch CH 2 EFFECT LOOP LEVEL Switch 760 W x 280 D x 622 H mm includes casters 29 15 16 W x 11 1 16 D x 24 1 2 H inches 31 2 kg 68 lbs 13 oz Owner s Manual Foot switch FS 5L BOSS In the interest of product improvement the specifications and or appearance of this unit are subject to change without prior notice CE For Europe This product complies with the
9. oes not exceed the Class B limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of Communications CLASSE B AVIS Cet appareil num rique ne d passe pas les limites de la classe B au niveau des missions de bruits radio lectriques fix s dans le R glement des signaux parasites par le minist re canadien des Communications Roland Corporation 03905412 05 03 1TP
10. oured GREEN AND YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured GREEN or GREEN AND YELLOW The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED The product which is equipped with a THREE WIRE GROUNDING TYPE LINE PLUG must be grounded USING THE UNIT SAFELY INSTRUCTIONS FOR THE PREVENTION OF FIRE ELECTRIC SHOCK OR INJURY TO PERSONS About Z WARNING and Z CAUTION Notices A WARNING CAUTION e Before using this unit make sure to read the instructions below and the Owner s Manual Do not open or perform any internal modifica tions on the unit Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used improperly Used for instructions intended to alert the user to the risk of injury or material damage should the unit be used improperly Material damage refers to damage or other adverse effects caused with respect to the home and all its furnishings as well to domestic animals or pets About the Symbols The A symbol alerts the user to important instructions or warnings The specific meaning of the symbol is determined by the design contained within the triangle In the case of the symbol at lef
11. requirements of European Directive 89 336 EEC For the USA FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Unauthorized changes or modification to this system can void the users authority to operate this equipment This equipment requires shielded interface cables in order to meet FCC class B Limit For Canada CLASS B NOTICE This digital apparatus d
12. return sound will not be output through the speakers even if you input the return sound to the RETURN R jack That is when the L MONO jack is not used only direct sounds will be output regardless of the LOOP switch setting Before you make connections to the RETURN jack s be sure to switch the units off 18 CH 2 EFFECT LOOP Switch This switch selects either the series or parallel connection for the Effects Loop circuit When PARALLEL is selected external effects sounds and direct sounds unprocessed sounds will be mixed When SERIES is selected external effects sounds will not be mixed with direct sounds SERIES CH2 Speaker INPUT aaa PES E EQ Vol Speaker RETURN R RETURN L MONO PARALLEL Speaker PES E Speaker EQ Vol 19 LINE OUT Jacks Use these jacks to connect the JC 120 to another guitar amplifier or mixer or to a tape deck for recording A stereo pair L R is provided but mono connections are also possible use the L MONO jack Switching On Power Turn on power to your various devices in the order specified By turning on devices in the wrong order you risk causing malfunction and or damage to speakers and other devices 1 Switch on the power on all devices EXCEPT the device s connected to the LINE OUT jacks 19 2 Turn on the JC 120 s power 3 Finally switch on the power on any devices connected to the LINE OUT jacks Attaching Removi
13. t it is used for general cautions warnings or alerts to danger The symbol alerts the user to items that must never be carried out are forbidden The specific thing that must not be done is indicated by the design contained within the circle In the case of the symbol at left it means that the unit must never be disassembled The symbol alerts the user to things that must be carried out The specific thing that must be done is indicated by the design contained within the circle In the case of the symbol at left it means that the power cord plug must be unplugged from the outlet __ ALWAYS OBSERVE THE FOLLOWING e Make sure you always have the unit placed so it is level and sure to remain stable Never place it on stands that could wobble or on inclined surfaces e Avoid damaging the power cord Do not bend it excessively step on it place heavy objects on it etc A damaged cord can easily become a shock or fire hazard Never use a power cord after it has been damaged e In households with small children an adult should provide supervision until the child is capable of following all the rules essential for the safe operation of the unit e Protect the unit from strong impact Do not drop it e Do not force the unit s power supply cord to share an outlet with an unreasonable number of other devices Be especially careful when using extension cords
14. tions You may hear a DC thump when switching the amplifier on or off but this is normal This unit is equipped with a protection circuit A brief interval a few seconds after power up is required before the unit will operate normally LINE OUT CH 2 EFFECT LOOP FOOT SWITCH RETURN SEND FHORUS REVERB DISTORTION R L MONO R L MONO VIBRATO GN ZEN GN ZEN LEVEL 7 N N X OO COO a SZ ZF 4dBm 20dBm SERIES PARALLEL i 14 14 FOOT SWITCH Jacks With the proper foot switch connected to the appropriate jack you can obtain on off control of Chorus Vibrato Reverb and or Distortion Even when a foot switch is turned on no effect will be obtained if knobs 7 and 11 are in the OFF positions 15 CH 2 EFFECT LOOP SEND Jack This is the jack from which the dry unprocessed signal is sent to the effects device 16 CH 2 EFFECT LOOP LEVEL Switch This switch selects the input output level for the Channel 2 effects loop Change the switch position to accommodate the effects device you are using When the connected unit s input output level is high set the switch to 4 dBm and when that level is low set the switch to 20 dBm 17 CH 2 EFFECT LOOP RETURN Jacks These are input jacks for the return signal from your effects device Stereo connections L R are possible To use the unit in mono use the L MONO jack When using this unit in mono the
15. with a soft dry cloth Never use benzene thinners alcohol or solvents of any kind to avoid the possibility of discoloration and or deformation Additional Precautions Use a reasonable amount of care when using the unit s buttons sliders or other controls and when using its jacks and connectors Rough handling can lead to malfunctions When connecting disconnecting all cables grasp the connector itself never pull on the cable This way you will avoid causing shorts or damage to the cable s internal elements A small amount of heat will radiate from the unit during normal operation To avoid disturbing your neighbors try to keep the unit s volume at reasonable levels especially when it is late at night When you need to transport the unit package it in the box including padding that it came in if possible Otherwise you will need to use equivalent packaging materials Panel Description Front Panel CHANNEL 1 CHANNEL 2 VOLUME TREBLE MIDDLE BASS VOLUME TREBLE MIDDLE 5 5 5 5 ox Gal GalRy aR aR e EDN AIR Q QIE Wiad Wie O O Ni O U WARN IRNS UARN 9 O O Zi O A o O 2 Q 2 Y 2 V 2 OFF o 0 D io d 0 0 S7 OOO se stag poe ea ee a e JAZZ CHORUS 120 123 4 5 6 123 4 5 1 Input Jacks Two input jacks are provided For a guitar with a standard output use the HIGH input For very high output instrum
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