Roland Stereo Amplifier JC 120 User Guide

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.  
 
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.  
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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
 
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
 
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
 
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
 
Specifications  
Rated Power output  
Speakers  
Power Supply  
120 W (60 W + 60 W) / 8 + 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 k0 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
 
03905412  
’05-03-1TP  
 

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