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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USING THE UNIT SAFELY
The
symbol alerts the user to important instructions
Used for instructions intended to alert
the user to the risk of death or severe
injury should the unit be used
improperly.
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.
Used for instructions intended to alert
the user to the risk of injury or material
damage should the unit be used
improperly.
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.
* 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.
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.
•
Before using this unit, make sure to read the
instructions below, and the Owner's Manual.
•
Always grasp only the plug on the power-supply
cord when plugging into, or unplugging from an
outlet.
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•
Do not open or perform any internal modifica-
tions on the unit.
•
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.
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•
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.
•
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
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loaded onto a vehicle.
•
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.
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•
Never climb on top of, nor place heavy objects on
the unit.
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•
Never handle the power cord or its plug with wet
hands when plugging into, or unplugging from,
an outlet.
•
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.
........................................................................................................................................
•
Before moving the unit, disconnect the power
plug from the outlet, and pull out all cords from
external devices.
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•
Protect the unit from strong impact.
(Do not drop it!)
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•
Before cleaning the unit, turn off the power and
unplug the power cord from the outlet (p. 5).
•
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.
•
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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•
Before using the unit in a foreign country, consult
with your dealer, or qualified Roland service
personnel.
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3
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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:
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.
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.
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.
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.
•
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.
•
•
This device may interfere with radio and television
reception. Do not use this device in the vicinity of such
receivers.
•
•
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).
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.
•
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.
•
4
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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
12.Pilot Lamp
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.
This will light when the amplifier is switched on.
13.POWER Switch
This switch turns the amplifier on and off.
2. BRI (Bright) Switch
When this switch is set to ON, a bright, clear sound can be
obtained.
*
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.
3. VOLUME Knob
Clockwise rotation will increase the amplifier’s overall
*
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.
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.
Rear Panel
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.
19
17
16 15 18
14
8. REVERB Knob
14.FOOT SWITCH Jacks
Clockwise rotation will intensify the reverb effect.
With the proper foot switch connected to the appropriate
jack, you can obtain on/off control of Chorus/Vibrato,
Reverb and/or Distortion.
9. Vibrato SPEED Knob
This knob adjusts the rate (frequency of the sound
vibrations) of the vibrato effect. Clockwise rotation increases
the vibrato speed.
*
Even when a foot switch is turned on, no effect will be obtained
if knobs 7 and 11 are in the “OFF” positions.
10.Vibrato DEPTH Knob
This knob adjusts the depth of the vibrato effect. Clockwise
rotation deepens the vibrato effect.
15.CH-2 EFFECT LOOP SEND Jack
This is the jack from which the dry (unprocessed) signal is
sent to the effects device.
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.
5
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16.CH-2 EFFECT LOOP LEVEL Switch
Switching On Power
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.”
*
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)
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.
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
*
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).
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.
*
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
(
)
RETURN L MONO
MAIN AMP
MAIN AMP
Speaker
Speaker
CH2
INPUT
INTERNAL
CHORUS
REVERB
Send
PRE AMP
EXTERNAL
EFFECTOR
EQ
Vol
RETURN R
(
)
RETURN L MONO
PARALLEL
Send
EXTERNAL
EFFECTOR
RETURN R
MAIN AMP
MAIN AMP
Speaker
Speaker
CH2
INPUT
INTERNAL
CHORUS
REVERB
PRE AMP
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).
6
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Specifications
Rated Power output
Speakers
Power Supply
120 W (60 W + 60 W) / 8 Ω + 8 Ω
30 cm (12 inches) + 30 cm (12 inches)
AC 117 V, AC 230 V or AC 240 V
Power Consumption
Nominal Input Level
Connectors
110 W (117 V, 230 V, 230 VE, 240 VA)
-30 dBm / 680 kΩ 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)
Controls
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
Dimensions
Weight
Accessories
Options
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.
For Europe
For the USA
This product complies with the requirements of European Directive 89/336/EEC.
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
NOTICE
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.
AVIS
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.
7
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03905412
’05-03-1TP
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