Block Diagram; Master Volume; Power Switch - Roland Acoustic Chorus AC-100 Owner's Manual

16. CHORUS INTENSITY
This knob adjusts the depth of the chorus effect. Rotating the knob
clockwise intensifies the effect.
* Rotating this knob during a performance may result in noise. This is not a
reason for concern, however.
17. REVERB LEVEL
Rotating this knob clockwise increases the reverb volume.
* A slight reverb can be heard even when this control is at its minimum set-
ting. If you want to eliminate reverb completely, set the REVERB switch to
"OFF."
18. GUITAR ANTI-FEEDBACK FREQUENCY
This knob adjusts the frequency of the feedback point.
* This knob acts only on the input signal from the GUITAR CHANNEL
input jack.
What does "anti-feedback" mean?
This is an extremely sensitive filter that cuts out only a certain
frequency. If this frequency point is adjusted to the level
where feedback occurs, unpleasant feedback due to resonance
can be suppressed.
19. GUITAR ANTI-FEEDBACK switch
This switches the GUITAR ANTI-FEEDBACK circuit on or off.

20. MASTER VOLUME

This knob adjusts the overall sound level. Rotating the knob clockwise
increases the volume.
21. Pilot light
This LED lights when the unit is on.

22. POWER switch

This switches the amp on or off.
* Be sure to set the VOLUME knob to "0" when switching the power on or
off.
* This unit is equipped with a protection circuit. A brief interval (a few sec-
onds) after power up is required before the unit will operate normally.
23. FOOT SWITCH jacks
These jacks allow one or more foot switches to be connected for
switching Reverb or Chorus on or off.
* When using a foot switch to control the on/off state, be sure to press the
CHORUS switch (11) and REVERB switch (13) for the channel to which
you wish to apply the effect.

Block Diagram

MIC/AUX
INPUT
Pre-Amp.
GUITAR
INPUT
Pre-Amp.
SEND
6
PRE EQ
POST EFF
Frequency
Separating
Effects
RETURN
24. GUITAR EFFECT SEND jack
This jack is used to send the input guitar signal to an external effects
device. Connect this to the effecter's input jack.
25. GUITAR EFFECT RETURN jack
This jack accepts the return signal from an external effects processor.
Connect this to the effecter's output jack.
* EFFECT SEND and RETURN work only with the GUITAR CHANNEL.
26. LINE OUT switch
This switch selects either "PRE EQ" or "POST EFF" for output from
the LINE OUT jacks.
PRE EQ: The unprocessed input sound is sent directly to the LINE
OUTs (monaural).
POST EFF: The input signal passes through the preamp and effects,
and the processed sound is output (stereo).
* See "Block Diagram" on this page for signal flow.
27. LINE OUT jacks
These jacks are used when you want to hook up a mixer or a recording
device. A mixed signal from both the MIC/AUX CHANNEL and the
GUITAR CHANNEL is output.
28. Radiation fins
The radiation fins can become very hot during operation, and
remain hot for a while after the unit is switched off. To avoid
burns and other accidents, do not touch the fins while the unit
is being used, or soon after the power has been turned off.
Switching On Power
* 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 dam-
age to speakers and other devices.
1.
Switch on the power on all devices EXCEPT the device(s) con-
nected to the LINE OUT jacks (27.).
2.
Turn on the AC-100's power.
3.
Finally, switch on the power on any devices connected to the
LINE OUT jacks.
LINE OUT
BALANCED
UNBALANCED
L
Main
C
Amp.
Unit
R