Roland JAZZ CHORUS JC-55 User manual

=Roland
GUITAR AMPLIFIER
JAZZ CHORUS
JC-59 JC-77
OPERATION MANUAL
@ Please read the operation manual carefully
for proper operation.
FEATURES
eThe Roland Jazz Chorus JC includes
newly developed heavy duty speaker.
The built-in 4 band equalizer allows
even more delicate tone color crea-
tion. (JC-77)
IMPORTANT NOTES
e Operating this amplifier near a neon
or fluorescent lamp may cause noise
interference. If so, change the posi-
tion or the angle of the guitar.
elf the reverb volume is set too high,
noise may be heard, so turn down
the reverb volume or change the po-
sition of the amplifier.
eRich and spacious chorus effect is
obtained by combination of the orig-
inal chorus circuit and twin power
amplifier.
e Turn the volume of this amplifier to
zero before connecting or disconnect-
ing the plug, to protect the speaker
from excessive strain.
e@ When setting up this amplifier with a
guitar, connect the connection cord
to the guitar first, then to the ampli-
fier. When disconnecting, pull out
the cord from the amplifier first and
then from the guitar.
e The JC adopts hard fiber in the cabi-
net edge, and polypropylene pro-
tector in the corner.
eThe removable casters are provided
for easy moving of the unit. (JC-77)
e Avoid giving a strong shock to this
amplifier, and do not move it while it
is operating.
eDo not use this amplifier in extreme
humidity or heat, or where it may be
affected by dust.
Clean this amplifier with mild deter-
gent, and do not use thinner.
e Use the specific fuse when replacing.

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WARNING When using electric products, basic precau-
tions should always be foliowed, including
the following;
. Read all the instructions before using the product.
To reduce the risk of injury, close supervision is
necessary when a product is used near children.
Do not use this product near water- for example,
near a 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 recommended by the manufacture.
. This product, either alone or in combination with an
amplifier and headphones or speakers, may be
capable of producing sound tevels that could cause
The lightning fiash with arrowhead symbol, within an equilateral
triangle,
is intended to alert the user to the presence of un-
insulated “dangerous voltage” within the product's enciosure
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 afert the user to the presence of important operating and
maintenance (servicing) instructions in the literature accom-
panying the product.
IMPORTANT SAFETY INSTRUCTIONS
10.
The power-supply cord of the product should be
unpiugged from the outlet when teft unused for a
long period of time.
. Do not tread on the power-supply cord.
. Do not pull the cord but hold the plug when
unplugging.
. When setting up with any other instruments, the
Procedure should be followed in accordance with
instruction manual.
. Care should be taken so that objects do not tall and
liquids are not spilled into the enclosure through
openings.
. The product should be serviced by qualified service
personnel when:
permanent hearing loss. : :
Do not operate for a long period of time at a high A. pid ty supply cord or the plug has been
volume favel or at favel that is uncomfortable. If you See
experience
any
hearing
foss
or
ringing
in
the
ears,
B:
Unies
dnadirapdhe
or
liquid
has
been
spilled
you
should
consult
an
audiologist.
C:
The
ee
exposed
to
rain;
or
. The product should be located so that its location or 3}
: The product does not appear to operate
position does not interfere with its proper ventilation. narmaily or exhibits a marked change in perfor-
The product should be located away from heat
mance: or
sources such as radiators, heat registers or other E: The pr nas been on portne enclosure
products that produce heat.
damaged.
. The product should avoid using in where it may be Do not attempt to service the product beyond that
eltected by dust.
described in the user-maintenance instructions. All
other servicing should be referred to qualified service
. The product should be connected to a power supply
only of the type described in the operating instruc-
personnel.
tions of as marked on the product.
SAVE THESE INSTRUCTIONS
WARNING
THIS APPARATUS MUST BE EARTH GROUNDED.
The three conductors of the mains
PLUG
lead attached to this apparatus are 5 -
identitied with color as shown in the | Color _| Mark on the matching terminal
table below, together with the [Brown | Red or letter L
[sive [Black ortetterN |
matching terminal on the UK type
G Green, Green-Yellow, jetter E
or symbol
power plug. When connecting the
mains lead to a plug, be sure to
connect each conductor to the cor- Yellow
fect terminal, as indicated
“This instruction applies to the
product for United Kingdom.”
Bescheinigung
des
Hersteliers
/Importeurs
RADIO
AND
TELEVISION
INTERFERENCE
Hiesmit woud bescheinigt, da der/die/das
ROLAND GUITAR AMPLIFIER JC:55/JC-77.
(Get, Tye fe
in Ubereinstimmung mit den Sestimmungen der
Amtsbl. Vfg 1046 / 1984
tureing the equemment on ond
Fohowng mesure
ables one or a time if the interference stan it
wetaed 1 0 cauler fos Katana deve you car
tAmubtattoe: tagungt For non Rotand dav-cay saritect tha manutactere
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funk-entstort it.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates
angezeigt und die Berechtigung zur Uberprufung der Serie auf Einhaltung Conse instsinng @ tootto teeter sctenns aun coset cane
der Bestimmungen eingeraumt. rN,
‘HE osecewary. you Meus comtult yOu! Geste: of en eaperenced +
adansons! suggestions You mey fing Neigtul the fotlawing boosie! orepered by the Faderat Com
muncatan Common
How ta foently ena Resoiwe Raden Tv interference Pragieme
Tha bounier a seetanie tom the US Government Printing Otfes watmngrae OC
Stars No 006 000 0045 4
Roland Corporation —
Hearne det Hevstetiert mporteor
20802
Copyright © 1987 by ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in
any form without the written permission of ROLAND CORPORATION.

PANEL ILLUSTRATION
@Control
Panel
(The
picture
shown
below
is
the
JC-77’s.
The
JC-55
does
not
feature
the
Hi-treble
Knob.)
Distortion Knob Hij-treble Control Middle Control Reverb Knob Chorus Depth Knob
Input Jacks Volume Knob | Treble Control Bass Control {Chorus Rate Knob] Chorus Selector Switch
@ Rear Panel
oom LINE OUT eon
EFFECT NORMAL
"
Reverb Foot
Switch Jack Line Out Jacks
Fuse der ‘ ‘
use Holder Chorus Foot | Distortion Foot
Switch Jack | Switch Jack
MIXED)
CONNECTION *Use the Line Out jacks to stack other guitar amplifier, or to connect a PA mixer or
recording equipment.
Normally, only one MONO(MIXED) Jack is to be used, but both of jacks may be
simultaneously used for benefitting maximum chorus effects. (If the Chorus Switch
is set to the OFF position, exactly the same signals are sent from these two jacks.)
*1f using a keyboard, connect it to the Low Input Jack.
Line In
Foot Switch Foot Switch
(FS-1) (FS-2)
To Hi Input
To Low Input
Keyboard
Guitar

OPERATION
(The
picture
shown
below
is
the
JC-77's.
The
JC-55
does
not
feature
the
Hi-treble
Knob.)
a EQUALIZER
CISTORTION VOLUME Hi- TREBLE TREBLE
Soe
Sie,
woe J mee prey one ( JAZZ CHORUS-T1
Set the control panel as shown above, then while playing the
guitar, adjust the Volume, Equalizer Section (Hi-Treble/Treble/
Middie/Bass) to your taste.
nn EQUALIZER
T INPUT | OISTOATION VOLUME Hi TREBLE TREBLE MIDOLE
O00
Adjust
the
amount
of
distortion
with
the
Distortion
Knob.
At
the
OFF
position,
there
is
no
distortion
effect.
As
you
raise
the
knob
clockwise,
the
created
distortion
sound
become
harder.
Here,
however,
the
overall
volume
will
increase
as
well.
So,
after
setting
the
Distortion
Knob,
adjust
the
volume
again
with
the
Volume
Knob.
Adjust the reverb effect with the Reverb Knob.
—————————“«
RATE ick, DEPTH sxicse]> CHORUS.
If you want the JC’s preset chorus effect, set the Chorus Selec-
tor Switch to the FIXED position.
If you wish to make your own chorus sound, set the switch to
the MANUAL position, and adjust the rate and depth of the
chorus effect to your taste with the Rate and the Depth Knobs.
In this case, if the Depth knob is set to zero, the Rate Knob
has no effect.
lf you do not want chorus effect at all, select the OFF posi-
tion.
Setting
of
Equalizer
Section
(The
picture
shown
below
is
the
JC-77's.
The
JC-55
does
not
feature
the
Hi-treble
Knob.)
The
JC’‘s
built-in
equalizer
allows
variable
sound
creation
depending
on
the
type
of
the
musical
instrument
used.
@
lf
using
a
guitar
of
humbacking
type
@ If using a guitar of single coil type
@If using a keyboard (electric piano or
organ)
Dastest ho
3 =
e e i s
eee COUNT
me Thame
Oct
2 oe BG
JAZZ CHORUS-77
JAZZ CHORUS-77
j
@ Chorus as a vibrato effect micas
@ Unique Distortion + Chorus
@Short Delay ra ontenten
t ‘eo.
©: #
nnn EUR ER rere
Cw
fy
(
ne FOU
os
wotmeme
ones,

SPECIFICATIONS
IN CASE OF TROUBLE
If this amplifier does not operate pro-
perly, check as shown right. If the
trouble cannot be remedied, please
contact your nearest service center.
OPTIONS
Middle
Bass
Distortion
Reverb
Chorus Rate
Chorus Depth
Rae ee JC-77 JC-55 |
| Output | 40W(822) + 40wi82) 25W(8Q) + 25W(822)
Speaker 25cm x 2 20cm x 2 24
Input Jacks HI, LOW, —31 dBm/1MQ [HI LOW, —30 dBm/1MQ |
Controls Volume Volume
Hi-Treble
Treble Treble
Bass
Distortion
Reverb
Chorus Rate
Chorus Depth
zt
Middle |
Chorus Selector Switch
Line Out 0 dBm/2.8kQ
Distortion Foot Switch
Reverb Foot Switch
Chorus Selector Switch
Line Out 0 dBm/120Q
Distortion Foot Switch
Reverb Foot Switch
The Power Indicator does
Consumption
Accessories
Chorus Foot Switch
22-5/8" x 19-7/8" x 10-1/4" 20-1/16" x 15-3/4" x 8-1/4"
Vinyl cover
19kg/41 Ib 140z
Vinyl cover
Specifications are subject to
Symptom
not light and no sound is
heard, even if the Power
Switch is turned on.
The Power Indicator lights
up, but no sound is heard.
There is no Chorus effect
obtained.
When the Chorus Selector
Switch is set to FIXED
| The power cable is not
change without notice.
Chorus Foot Switch
110W i
Cause
securely connected,
@ The volume of the ampli-
fier or guitar is set too
tow.
e There is something wrong
with the connection cord,
The Foot Switch is turn-
ed off.
Action to be takan
See if the power cable is
securely connected.
@ Turn the volume up.
@ Exchange the cord.
When the Chorus Selector The Foot Switch is turn- Press the Foot Switch, or |
Switch issettoMANUAL | ed off, or the Depth turn up the Depth Knob. |
Knob is set too low.
Hum or noise is heard. @ There is something wrong @ Exchange the connection
| with the connection cord. cord,
eConnections are not se- ®See if the cords are se- |
curely done. curely connected,
@Connect the power.plug |
upside down. i
i 7
i
The volume is too low,and |
the distortion effect is too |
weak '
The Low Input Jack is
used.
Connect to the High Input
Jack,
There is no reverb effect
obtained.
The Foot Switch is turned
off,
Press the Foot Switch,
fect obtained.
L
4
There is no distortion ef-
The Foot Switch is turned
off,
Foot Switch FS-1
eens [natant
Press the Foot Switch,
Foot Switch FS-2

i=Roland*
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wwii
=— Roland