Panel Description; Front Panel; Rear Panel; Input Jacks - Roland Jazz Chorus JC-120 Owner's Manual

Panel Description

Front Panel

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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.
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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

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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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