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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
• 120 watts of output power; 2 channels of 60 watts each. Channel 2 is equipped
with Roland’s renowned chorus effect.
• Two input jacks (high-gain and low-gain) accommodate virtually any guitar.
• Both channels contain a Bright switch for greater tonal control.
•A three-spring reverb unit produces a warm, distinctive sound.
• The reinforced cabinet is designed to withstand the rigors of the road while
providing characteristic styling.
• Chorus/Vibrato, Reverb and Distortion can all be controlled by foot switches
leaving your hands free for playing.
• 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 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.
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CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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:
Read all the instructions before using the product.
1.
Do not use this product near water — for example, near a
2.
bathtub, washbowl, kitchen sink, in a wet basement, or near
a swimming pool, or the like.
This product should be used only with a cart or stand that is
3.
recommended by the manufacturer.
This product, either alone or in combination with an amplifier
4.
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.
The product should be located so that its location or position
5.
does not interfere with its proper ventilation.
The product should be located away from heat sources such
6.
as radiators, heat registers, or other products that produce
heat.
The product should be connected to a power supply only of
7.
the type described in the operating instructions or as marked
on the product.
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 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:
IMPORTANT:
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 coloured 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.
THIS APPARATUS MUST BE EARTHED
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE.
GREEN-AND-YELLOW: EARTH, BLUE: NEUTRAL, BROWN: LIVE
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USING THE UNIT SAFELY
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.
• Before using this unit, make sure to read the
instructions below, and the Owner's Manual.
.........................................................................................................................................
• Do not open or perform any internal modifications on the unit.
.........................................................................................................................................
• 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.
.........................................................................................................................................
• 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.
.........................................................................................................................................
• 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.
.........................................................................................................................................
• Protect the unit from strong impact.
(Do not drop it!)
.........................................................................................................................................
• 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—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.
.........................................................................................................................................
• Before using the unit in a foreign country, consult
with your dealer, or qualified Roland service
personnel.
.........................................................................................................................................
The 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 left, 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 powercord plug must be unplugged from the outlet.
• Always grasp only the plug on the power-supply
cord when plugging into, or unplugging from an
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.
........................................................................................................................................
• Never handle the power cord or its plug with wet
hands when plugging into, or unplugging from,
an outlet.
........................................................................................................................................
• Before moving the unit, disconnect the power
plug from the outlet, and pull out all cords from
external devices.
........................................................................................................................................
• Before cleaning the unit, turn off the power and
unplug the power cord from the outlet (p. 5).
........................................................................................................................................
• Whenever you suspect the possibility of lightning
in your area, pull the plug on the power cord out
of the outlet.
........................................................................................................................................
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IMPORTANT NOTES
In addition to the items listed under “IMPORTANT SAFETY
INSTRUCTIONS” and “USING THE UNIT SAFELY” on
pages 2 and 3, please read and observe the following:
Power 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.
Placement
• 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 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.
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Panel Description
Front Panel
1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13
1. Input Jacks
Two input jacks are provided. For a guitar with a standard
output, use the “HIGH” input. For very high output
instruments, 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.
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 connections. 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.
Rear Panel
19 17 16 15 18 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.
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1.
2.
3.
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 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.
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.
Switch on the power on all devices EXCEPT the device(s)
connected to the LINE OUT jacks (19).
Turn on the JC-120’s power.
Finally, switch on the power on any devices connected to
the LINE OUT jacks.
Attaching/Removing Caster Wheels
The caster wheels were not attached at the factory. To attach
or remove them, do as shown in the illustration.
SERIES
CH2
INPUT
PRE AMP
EQ Vol
PARALLEL
CH2
INPUT
PRE AMP
EQ Vol
Send
Send
EXTERNAL
EFFECTOR
EXTERNAL
EFFECTOR
RETURN L (MONO
RETURN R
RETURN L (MONO
RETURN R
)
)
INTERNAL
CHORUS
REVERB
INTERNAL
CHORUS
REVERB
MAIN AMP
MAIN AMP
MAIN AMP
MAIN AMP
Speaker
Speaker
Speaker
Speaker
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).
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Specifications
Rated Power output 120 W (60 W + 60 W) / 8 Ω + 8 Ω
Speakers
Power Supply
Power Consumption 110 W (117 V, 230 V, 230 VE, 240 VA)
Nominal Input Level -30 dBm / 680 k Ω 0 dBm = 0.775 V
Connectors
Controls
Dimensions
Weight
Accessories
Options
* In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.
30 cm (12 inches) + 30 cm (12 inches)
AC 117 V, AC 230 V or AC 240 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)
For Europe
This product complies with the 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
This digital apparatus does 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
Cet appareil numérique ne dépasse pas les limites de la classe B au niveau des émissions de bruits radioélectriques
fixés dans le Règlement des signaux parasites par le ministère canadien des Communications.
NOTICE
AVIS
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03905412 ’05-03-1TP
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