Roland Jazz chorus JC-50 User manual

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JAZZ CHORUS
JC-50 INSTRUCTIONS

I= Roland
JAZZ CHORUS
FEATURES
@50 watt output combination amplifier
(rms)
equipped with chorus effect for deep and extensive
sound, and characteristic soft vibrato effect
(frequency modulation).
®With two input jacks (high-gain and low-gain), you
can use a guitar having any kind of output.
@Provided with Bright Switch for a wider variety of.
tone setting.
@Provided with sweet, creamy soft distortion effect
and reverb effect for fidelity and fullness of reverb
_ by the “folded delay line’ or the latest ‘“Z fold”
reverb unit. :
@Cabinet is perfectly guarded: edges by hard fiber
and corners by PP protector. ‘
@Chorus/Vibrato, Reverb and Distortion can be
remote-controlled by footswitches. You can switch
on/off instantly without having to take your hands
from the guitar.
@Provided with phones jack, you can hear through
ordinary monaural or stereo headphones.
®Provided with a Chorus/Vibrato output jack. When
another guitar amplifier is connected to this unit
through this jack, a rich effect of stereo chorus
and vibrato can easily be achieved.
Please read these instructions carefully for proper
connecting and operating procedures.
JC-50 INSTRUCTIONS
RADIO AND TELEVISION INTERFERENCE
“Warning — This equipment has been verified to comply with the limits for a Class B computing device,
Pursuant to Subpart J, of Part 15, of FCC rules. Operation with non-certified or non-verified equip-
The equipment described in this manual generates and uses radio-frequency energy. If it is not
installed and used properiy, that is, in strict accordance with our instructions, it may cause interfer-
ence with radio and television reception.
This equipment has been tested and found to comply with the limits for a Class 8 computing
Gevice in accordance with the specifications in Subpart J, of Part 15, of FCC Rules. These rutes are
designed to provide reasonable protection against such a interference in a residential installation.
However, there is nO guarantee that the interference will not occur in a particular instaliation. I+ this
equipment does cause interference to radio or television reception, which can be determined by
turning the equipment on and off, the user is encouraged to try to correct the interference by the
following measure:
@ Disconnect other devices and their input/output cables one at a time. If the interference s.ops, it
is caused by either the other device or its |/O cable,
These devices usualty require Roland designated shielded 1/O cables. For Roland devices, you can
obtain the proper shieided cable from your dealer, For nen Roiand devices, contact the manufacturer
or dealer for assistance.
lf your equipment does cause interterence to radio or television reception, you can try to correct
the interference by using one or more of the failowing measures:
@ Turn the TV or radio antenna until the interference stops.
@ Move the equipment to one side or the other af the TV or radio.
@ Move the equipment farther away from the TV or radio.
@ Plug the equipment into an outlet that is on a different circuit than the TV or radio. (That is, maké
certain the equipment and the radio or television set are on circuits controtied by different circuit
breakers or fuses.)
@ Consider installing a rooftop television antenna with coaxial cable jead-in between the antenna and
Ty.
If necessary, you should consuit your deaier or an experienced radio/television technician for
additionai suggestions. You may find helpful the following booklet prepared by the Federa! Com-
munications Commission:
“How to Identity and Resolve Radio-TV interference Problems”
This bookiet is availabie fram the U.S. Government Printing Office, Washington, D.C., 20402,
Stock No, 004-000-00345.4.

CONNECTING JC-50 FOOTSWITCH
TO
DISTORTION
JACK
FS-2
[
FOOTSWITCH FS-1
* FS-3 with three switches
TO
REVERB
JACK
is
also
available.
HEADPHONES
RH-10
TO EXTERNAL GUITAR AMP’S
MAIN INPUT (LO INPUT)
LOW INPUT Hcccocce |imag
GUITAR
(In case of JC-50)
OPERATING JC-50
TO OBTAIN NORMAL SOUND: Set knobs and controls as illustrated below and adjust volume and tone controls (Treble-Bass)
to proper positions while playing your guitar.
VOLUME TREBLE BASS
» OOOO
OFF
O
O00
»
@
TO
ADJUST
CHORUS:
After
perfecting
the
setting
for
normal
sound,
set
Chorus/Vibrato
changeover
switch
to
Chorus,
to
obtain
chorus
effect.
©
°e 1 OOOOO0O0O!4, o 6
CHORUS
TO ADJUST VIBRATO: After perfecting the setting for normal sound, set Chorus/Vibrato changeover switch to Vibrato, to
obtain vibrato effect. Set Speed and Depth controls at proper positions while playing your guitar.
©
SPEED
DEPTH
{Oy
e
16000000!
°-
@
TO
OBTAIN
DISTORTION
SOUND:
Starting
from
the
setting
for
normal
sound,
set
Distortion
control
at
a
proper
position
in
ON
region
to
obtain
soft
distortion.
DISTORTION
©
2
>OOOO0O0O0*
°o
6
5
TO
ADJUST
REVERB
CONTROL:
Turn
Reverb
Control
to
proper
position
to
obtain
the
reverberation
effect
as
you
like.
CHORUS EFFECT
With
the
chorus
effect
of
JC
series,
sound-delay
circuit
is
to
produce
a
unison.
By
this
unique
chorus
effect,
sweet
and
used
to
make
a
signal
having
a
slightly
different
pitch
from
soft
color
is
added
to
the
electric
guitar
tone.
the direct sound, which is then mixed with the direct sound

CONTROLS AND FUNCTIONS
CONTROL PANEL
VIBRATO SPEED
VIBRATO DEPTH
INPUT JACK
BRIGHT SWITCH
VOLUME
TREBLE
BASS
DISTORTION
REVERB
CHORUS/VIBRATO
PILOT LAMP
POWER SWITCH
INPUT JACK
Two input jacks (high and low) are
equipped. For ordinary output guitar,
connect to “HIGH.” For very big output
guitars, connect to “LOW.”
BRIGHT SWITCH
When this switch is set to ON, clearer
sound can be obtained. Thus, the tone
can be changed to hard or soft.
VOLUME
This knob controls volume. Turn clock-
wise (©) to increase, and counterclock-
wise ((), to decrease.
TREBLE
This knob controls high range response.
Turn clockwise (Q) to lift and counter-
clockwise (), to cut.
BASS
This knob controls low range response.
Turn clockwise (©) to lift and counter-
clockwise (©), to cut.
DISTORTION
This knob controls distortion. Turn
clockwise {Q) for greater distortion, and
counterclockwise (©) for slight distor-
tion. At OFF position, no distortion is
produced.
REVERB
This knob controls reverberation sound.
Turn clockwise (Q) to increase, and
counterclockwise (©) to decrease.
VIBRATO SPEED
This knob controls speed of vibrato.
Turn clockwise (©) for faster speed and
counterclockwise (©) for slower vibrato.
REAR PANEL
CHORUS/VIBRATO DISTORTION
PHONES JACK REVERB
CHORUS/VIBRATO OUTPUT JACK
FOOTSWITCH JACK
PHONES JACK
Connecting headphones to this jack, no
sound is produced through the speaker.
You can enjoy your playing loud even at
midnight. Stereo headphones can be
used,
DISTORTION FOOTSWITCH JACK
Connect footswitch to this jack and you
can remote-control Distortion to ON or
OFF while in performance.
CHORUS/VIBRATO FOOTSWITCH
JACK
Connect footswitch to this jack and you
can remote-control Chorus or Vibrato,
whichever is set with Chorus/Vibrato
changeover switch on the control panel,
to ON or OFF while in performance.
REVERB FOOTSWITCH JACK
Connect footswitch to this jack and you
can remote-control Reverb to ON or
OFF while in performance.
VIBRATO DEPTH
This knob controls depth of vibrato.
Turn clockwise (Q) for deeper effect.
CHORUS/OFF/VIBRATO CHANGE.
OVER SWITCH
Changeover of chorus-normal-vibrato can
be accomplished simply by touching this
switch.
POWER/POLARITY SWITCH — PILOT
LAMP
Set to ON to run the amplifier. Pilot
lamp lights. If noise or power-line hum is
heard, change the polarity of power
switch.
CHORUS/VIBRATO OUTPUT JACK
When this unit is connected to an ex-
ternal amplifier through the Chorus/
Vibrato output jack, widely expanding
chorus and vibrato effects can be ac-
hieved. The output level is OdB, and the
following functions are provided.
@ This unit must be connected to either
MAIN-IN or LOW INPUT jack of an
external amplifier through the Cho-
rus/Vibrato output jack.
1. When the Chorus/Vibrato selector
switch is OFF, normal sound is pro-
duced from the JC-50, and sound
identical to that from the REC OUT
jack of the JC-50 is produced from
the external amplifier.
2. When the mode select switch remains
On, the unit outputs only the normal
and reverb sounds, while the external
amplifier outputs either the chorus or
vibrato effect sound only (whereas
the reverb sound is not sent out at
all).

JC-50 INSTRUCTIONS Printed in Japan Feb. ‘85 A-3
CAUTION
SPECIFICATIONS
e
if
neon
or
fluorescent
lamp
is
located
close
to
amplifiers
or
Output..........
50W
(rms)
instruments,
that
may
cause
noise.
Separate
them
from
each
Speak
30
1
other.
Also,
selecting
direction
of
guitar
can
reduce
the
noise.
POAIREE
ane
2
ig
ee
er
. Channel ......... 1
olf
beats
.
:
out
the
eel
ae
with
amplifier
volume
Input
jacks
.......
High/Low
=
ia
Ne
ns
‘
speaker Ss
eavily
oaded,
Raveing
the
fear
Controls .........
Volume,
Treble,
Bass,
Distortion,
Oo
reaking
it.
Do
it
after
turning
volume
to
‘0’'
without
Reverb,
Vibrato
speed,
Vibrato
fail.
depth
@When connecting instrument and amplifier, connect cord Switches......... Bright, Chorus/Vibrato, Power
plug to instrument first and then the other end to amplifier. SACKS 5 6 oe ee a es Footswitch (Chorus/Vibrato,
For disconnection, reverse the order: from amplifier first
and then from instrument. .
Distortion, Reverb), Phones
Chorus/Vibrato Out
,
Le
.
.
Power
consumption
150VA
@Do
not
exert
big
shock
upon
amplifier.
Avoid
moving
:
i
amplifier
while
it
is
in
operation.
Dimensions
0
vs
+
perl
apes
a
@
Avoid
using
JC-50
where
there
is
much
dust
or
under
high
Weight..........
18kg,
40lbs
humidity
conditions,
which
may
cause
trouble.
Accessary
........
Vinyl
cover
© If amplifier is soiled, clean with neutral cleanser.
* Avoid using thinner or the like.
eWhen replacing a fuse, be sure to use the one with the
specified rating.
OPTION
FOOTSWITCH FS-2 STEREO HEADPHONES RH-10
Footswitch for remote-controlled ON/ Footswitch for remote-controlled ON/ Stereo headphones best-suited for moni-
OFF operation of effects. OFF operation of effects. toring guitar amplifier, keyboard, mixer,
@ FS-5 with 5m cord is also available. etc.
FOOTSWITCH FS-1
TROUBLESHOOTING GUIDE
If your unit does not operate properly, take proper action
consulting the table below. The symptom listed would be
caused by mistake in using the unit. If the trouble cannot
be remedied even after the actions are taken as instructed, or
if there is any symptom other than those listed, make contact
with the shop where you bought your JC-50.
SYMPTOM
Even when power switch is set to
ON, pilot lamp does not light and
no sound is produced.
POSSIBLE CAUSE
Imperfect connection of power
cord.
Pilot lamp lights, but no sound
is produced.
|———______—
Volume is set to minimum.
ACTION TO BE TAKEN
Plug in power cord perfectly.
Turn to proper level.
Distortion not effected.
Footswitch is set to OFF.
Tread footswitch to ON.
Reverb effect inoperative.
Vibrato effect inoperative.
Footswitch is set to OFF.
Reverb control is set to minimum.
set to center position.
Footswitch is set to OFF.
Speed or depth control is set to
minimum.
Tread footswitch to ON.
Turn to proper tevel.
Chorus/Vibrato Changeover Switch Set Chorus/Vibrato Changeover Switch
to Vibrato.
Tread footswitch to ON.
Turn speed or depth control to
proper position.
Chorus effect inoperative.
Chorus/Vibrato Changeover Switch
set to center position.
Footswitch is set to OFF.
Set Chorus/Vibrato Changeover Switch
to Chorus.
Tread footswitch to ON.

(=Roland*’
10163
Ve
I=Roland: