Roland AC 60 Service Manual
Owner’s Manual
Thank you, and congratulations on your choice of the Roland AC-60 Acoustic Chorus.
Before using this unit, carefully read the sections entitled:
• IMPORTANT SAFETY INSTRUCTIONS (page 2)
• USING THE UNIT SAFELY (page 3–4)
• IMPORTANT NOTES (page 5)
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, Owner’s manual should be read in its entirety. The
manual should be saved and kept on hand as a convenient reference.
Contents
IMPORTANT SAFETY INSTRUCTIONS...........................................2
USING THE UNIT SAFELY............................................................3
IMPORTANT NOTES...................................................................5
Main Features...........................................................................6
Names of Things and What They Do .........................................7
Control Panel
Rear Panel
..........................................................................7
...........................................................................11
Example of Using Two Channels Combined............................. 13
How to Use the Folding Stand................................................. 14
Using a Speaker Stand ...........................................................15
Block Diagram........................................................................16
Specifications..........................................................................17
Copyright © 2003 ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without
the written permission of ROLAND CORPORATION.
2
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the
product’s enclosure 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 alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the product.
INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS.
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
WARNING - When using electric products, basic precautions should always be followed, including the following:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in
accordance with the manufacturers instructions.
8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with
one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the
third prong are provided for your safety. When the provided
plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
11. Only use attachments/accessories specified by the
manufacturer.
12. Never use with a cart, stand, tripod, bracket,
or table except as specified by the
manufacturer, or sold with the apparatus.
When a cart is used, use caution when
moving the cart/apparatus combination to
avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when
unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing
is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid
has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
For the U.K.
WARNING:
IMPORTANT:
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying
the terminals in your plug, proceed as follows:
The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by the
letter E or by the safety earth symbol or coloured GREEN or GREEN-AND-YELLOW.
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.
THIS APPARATUS MUST BE EARTHED
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE.
GREEN-AND-YELLOW: EARTH, BLUE: NEUTRAL, BROWN: LIVE
USING THE UNIT SAFELY
Used for instructions intended to alert
the user to the risk of death or severe
injury should the unit be used
improperly.
Used for instructions intended to alert
the user to the risk of injury or material
damage should the unit be used
improperly.
* 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.
001
• Before using this unit, make sure to read the
instructions below, and the Owner’s Manual.
..........................................................................................................
• To avoid overheating and possible fire and shock
hazards, the AC-60 must not be used in an
enclosure with less than 50 cm air spacing from all
sides.
..........................................................................................................
002a
• Do not open or perform any internal modifications on the unit.
..........................................................................................................
003
• Do not attempt to repair the unit, or replace parts
within it (except when this manual provides
specific instructions directing you to do so). Refer
all servicing to your retailer, the nearest Roland
Service Center, or an authorized Roland
distributor, as listed on the “Information” page.
..........................................................................................................
004
• Never use or store the unit in places that are:
• Subject to temperature extremes (e.g., direct
sunlight in an enclosed vehicle, near a heating
duct, on top of heat-generating equipment); or
are
• Damp (e.g., baths, washrooms, on wet floors);
or are
• Humid; or are
• Exposed to rain; or are
• Dusty; or are
• Subject to high levels of vibration.
..........................................................................................................
008a
• The unit should be connected to a power supply
only of the type described in the operating instructions, or as marked on the unit.
..........................................................................................................
The symbol alerts the user to important instructions
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.
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.
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 powercord plug must be unplugged from the outlet.
009
• Do not excessively twist or bend the power cord,
nor place heavy objects on it. Doing so can
damage the cord, producing severed elements and
short circuits. Damaged cords are fire and shock
hazards!
..........................................................................................................
010
• This unit, either alone or in combination with an
amplifier and headphones or speakers, may be
capable of producing sound levels that could
cause permanent hearing loss. Do not operate for
a long period of time at a high volume level, or at
a level that is uncomfortable. If you experience
any hearing loss or ringing in the ears, you should
immediately stop using the unit, and consult an
audiologist.
..........................................................................................................
011
• Do not allow any objects (e.g., flammable material,
coins, pins); or liquids of any kind (water, soft
drinks, etc.) to penetrate the unit.
..........................................................................................................
012a:
• Immediately turn the power off, remove the
power cord from the outlet, and request servicing
by your retailer, the nearest Roland Service
Center, or an authorized Roland distributor, as
listed on the “Information” page when:
• The power-supply cord, or the plug has been
damaged; or
• If smoke or unusual odor occurs
• Objects have fallen into, or liquid has been
spilled onto the unit; or
• The unit has been exposed to rain (or otherwise
has become wet); or
• The unit does not appear to operate normally or
exhibits a marked change in performance.
..........................................................................................................
3
013
• 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.
..........................................................................................................
014
• Protect the unit from strong impact.
(Do not drop it!)
..........................................................................................................
015
• 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.
..........................................................................................................
• Never lift up and carry the AC-60 by holding the
folding stand.
..........................................................................................................
016
• Before using the unit in a foreign country, consult
with your retailer, the nearest Roland Service
Center, or an authorized Roland distributor, as
listed on the “Information” page.
..........................................................................................................
101a
• The unit should be located so that its location or
position does not interfere with its proper ventilation.
..........................................................................................................
102a
• Always grasp only the plug on the power-supply
cord when plugging into, or unplugging from an
outlet.
..........................................................................................................
103a:
• Any accumulation of dust between the power
plug and the power outlet can result in poor
insulation and lead to fire. Periodically wipe away
such dust with a dry cloth. Also, disconnect the
power plug from the power outlet whenever the
unit is to remain unused for an extended period of
time.
..........................................................................................................
104
• 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.
..........................................................................................................
106
• Never climb on top of, nor place heavy objects on
the unit.
..........................................................................................................
107a
• Never handle the power cord or its plug with wet
hands when plugging into, or unplugging from,
an outlet.
..........................................................................................................
108a
• Before moving the unit, disconnect the power
plug from the outlet, and pull out all cords from
external devices.
..........................................................................................................
109a
• Before cleaning the unit, turn off the power and
unplug the power cord from the outlet.
..........................................................................................................
110a
• Whenever you suspect the possibility of lightning
in your area, pull the plug on the power cord out
of the outlet.
..........................................................................................................
120
• Always turn the phantom power off when
connecting any device other than condenser
microphones that require phantom power. You
risk causing damage if you mistakenly supply
phantom power to dynamic microphones, audio
playback devices, or other devices that don't
require such power. Be sure to check the specifications of any microphone you intend to use by
referring to the manual that came with it.
(This instrument's phantom power: 48 V DC, 10 mA Max)
..........................................................................................................
4
IMPORTANT NOTES
291b
In addition to the items listed under “IMPORTANT SAFETY INSTRUCTIONS” and “USING THE UNIT SAFELY” on pages 2
and 3–4, please read and observe the following:
Power Supply
301
• 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).
307
• 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.
Placement
351
• 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 interference.
352a
• This device may interfere with radio and television
reception. Do not use this device in the vicinity of such
receivers.
352b
• Noise may be produced if wireless communications
devices, such as cell phones, are operated in the vicinity of
this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience
such problems, you should relocate such wireless devices
so they are at a greater distance from this unit, or switch
them off.
354b
• 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.
Also, do not allow lighting devices that normally are used
while their light source is very close to the unit (such as a
piano light), or powerful spotlights to shine upon the
same area of the unit for extended periods of time.
Excessive heat can deform or discolor the unit.
355b
• When moved from one location to another where the
temperature and/or humidity is very different, water
droplets (condensation) may form inside the unit. Damage
or malfunction may result if you attempt to use the unit in
this condition. Therefore, before using the unit, you must
allow it to stand for several hours, until the condensation
has completely evaporated.
356
• Do not allow rubber, vinyl, or similar materials to remain
on the unit for long periods of time. Such objects can
discolor or otherwise harmfully affect the finish.
357
• Do not put anything that contains water (e.g., flower
vases) on the unit. Also, avoid the use of insecticides,
perfumes, alcohol, nail polish, spray cans, etc., near the
unit. Swiftly wipe away any liquid that spills on the unit
using a dry, soft cloth.
359
• Do not paste stickers, decals, or the like to this instrument.
Peeling such matter off the instrument may damage the
exterior finish.
• Do not allow objects to remain on top of the unit while it is
in operation.
Maintenance
401b
• To clean the unit, use a dry, soft cloth; or one that is
slightly dampened. Try to wipe the entire surface using an
equal amount of strength, moving the cloth along with the
grain of the wood. Rubbing too hard in the same area can
damage the finish.
402
• Never use benzine, thinners, alcohol or solvents of any
kind, to avoid the possibility of discoloration and/or
deformation.
Additional Precautions
553
• 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.
556
• 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.
557
•A small amount of heat will radiate from the unit during
normal operation.
559a
• 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.
562
• Use a cable from Roland to make the connection. If using
some other make of connection cable, please note the
following precautions.
• Some connection cables contain resistors. Do not use
cables that incorporate resistors for connecting to this
unit. The use of such cables can cause the sound level
to be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable.
921
• 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.
941
• Once the connections have been completed, 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.
When powering up:
Turn on the power to the AC-60
When powering down:
Turn off the power to the AC-60
• Wrap the AC cord around the cord hook when transporting or storing the unit.
last
first
.
.
5
Main Features
The AC-60 is a compact, high-performance monitor amp developed exclusively for use with acoustic instruments.
It fully presents the harmonic richness of tone characteristic of acoustic instruments.
Compact, High-Performance Stereo
Amp
• Comes equipped with two specially developed 16-cm
(6.5-inch) wide-range speakers.
• Features stereo output (30 W + 30 W).
• Housed in a bass-reflex cabinet.
Features Two Independent Channels,
GUITAR and MIC/LINE
• Each channel includes a 3-band equalizer.
• GUITAR channel handles both piezo and magnetic
pickups.
• The MIC/LINE channel features phantom power,
utilizing highly reliable, dedicated 48 V-output phantom
circuitry.
• Using the MIC/LINE channel for LINE input allows you
to connect guitars with magnetic pickups. You can use a
single guitar’s piezo and magnetic pickups
simultaneously and mix (blend) the sounds together.
High-Quality Digital Effects
• Includes three types of stereo chorus: “SPACE,”
whereby the chorus is synthesized in actual space;
“RICH,” in which the amount of the effect is applied
separately in each frequency range; and “WIDE,” which
provides an enhanced sense of expansiveness using
discrete frequency bands.
• Includes stereo reverb developed especially for acoustic
instruments, which gives a sense of spaciousness and
natural body to the sound.
• Also features a delay effect developed especially for
acoustic instruments, which produces a soft, tuned
sound.
• Furthermore, you can connect an optional foot switch
and use it to turn these effects on and off.
Anti-Feedback Suppresses Feedback
• Anti-feedback features two ways to detect the feedback
point, using the “Manual settings,” or the “Auto
settings,” which allow the feedback point to be detected
automatically.
• You can connect an optional foot switch and use your
foot to operate this feature.
Mute Function
• The Mute switch provided makes it easy for you to mute
the sounds for the AC-60’s own speakers as well as the
sounds from LINE OUT. By using the Mute function,
you can plug in and out noiselessly at the guitar.
Furthermore, when you have a tuner connected to
TUNER OUT, the Mute function lets you tune your
instrument without outputting any sound.
• You can connect an optional foot switch and use your
foot to turn this on and off.
External Input Jacks (AUX IN)
• Includes external input jacks, allowing you to connect a
CD player, backing machine, or other device in stereo.
• These include both RCA phono jacks and 1/4” phone
jacks, making it possible to connect just about any kind
of device.
Multiple Output Connectors
• Features DI out that allow you to output directly the
signals input from connected instruments and mics. You
can also connect a tuner. Compatible with TRS balanced
output.
• Line outs feature 1/4” phone mono-output jacks in
addition to XLR connectors for stereo output. You can
use a single AC-60 for all applications.
• It also features a subwoofer out. Connecting a powered
subwoofer allows you to play with an even punchier,
more powerful low end.
• The amp also includes a headphones out that you can
use when playing during nighttime hours and when
making sound checks.
Convenient Placement Features
• Includes an “folding stand” that allows you to change
the angle of the amp when using it for monitoring
purposes.
• It also includes a “speaker stand adapter,” which allows
you to attach the AC-60 to a speaker stand. This makes
using the AC-60 easier when you are performing
standing up, and allows you to use the amp as a simple
PA.
• Also included is a carrying case for greater portability.
6
Loading...