Yamaha Audio PC9500N, PC4800N User Manual
POWER AMPLIFIER
Owner’s Manual
E
FCC INFORMATION (U.S.A.)
1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT! This product, when installed as indicated in the instructions contained in this manual, meets FCC
requirements. Modifications not expressly approved by Yamaha may void your authority, granted by the FCC, to use the product.
2. IMPORTANT: When connecting this product to accessories and/or another product use only high quality shielded cables. Cable/s supplied with this product MUST
be used. Follow all installation instructions. Failure to follow instructions could void your FCC authorization to use this product in the USA.
3. NOTE: This product has been tested and found to comply with the requirements listed in FCC Regulations, Part 15 for Class “B” digital devices. Compliance with
these requirements provides a reasonable level of assurance that your use of this product in a residential environment will not result in harmful interference with
other electronic devices. This equipment generates/uses radio frequencies and, if not installed and used according to the instructions found in the users manual, may
cause interference harmful to the operation of other electronic devices. Compliance with FCC regulations does not guarantee that interference will not occur in all
installations. If this product is found to be the source of interference, which can be determined by turning the unit “OFF” and “ON”, please try to eliminate the
problem by using one of the following measures: Relocate either this product or the device that is being affected by the interference. Utilize power outlets that are on
different branch (circuit breaker or fuse) circuits or install AC line filter/s. In the case of radio or TV interference, relocate/reorient the antenna. If the antenna lead-in
is 300 ohm ribbon lead, change the lead-in to coaxial type cable. If these corrective measures do not produce satisfactory results, please contact the local retailer
authorized to distribute this type of product. If you can not locate the appropriate retailer, please contact Yamaha Corporation of America, Electronic Service
Division, 6600 Orangethorpe Ave, Buena Park, CA 90620
The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries.
• Explanation of Graphical Symbols
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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 above warning is located on the
top of the unit.
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
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 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 applies only to products distributed by YAMAHA KEMBLE
MUSIC (U.K.) LTD.
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.
European Specifications Only
This mark indicates a dangerous electrically live terminal.
When connecting an external wire to this terminal, it is
necessary either to have “a person who have received
appropriate guidance on handling” make the connection or to
use leads or a cord that have been manufactured in such a way
that the connection can be made simply and without problem.
2
Precautions
WARNING
Installation
• Connect this unit’s power cord only to an AC outlet of the
type stated in this Owner’s Manual or as marked on the unit.
Failure to do so is a fire and electrical shock hazard.
• Do not allow water to enter this unit or allow the unit to
become wet. Fire or electrical shock may result.
• Do not place a container with liquid or small metal objects on
top of this unit. Liquid or metal objects inside this unit are a
fire and electrical shock hazard.
• Do not place heavy objects, including this unit, on top of the
power cord. A damaged power cord is a fire and electrical
shock hazard. In particular, be careful not to place heavy
objects on a power cord covered by a carpet.
• Use only the included power cord for this unit. Using other
types may be a fire and electrical shock hazard.
Operation
• Do not scratch, bend, twist, pull, or heat the power cord. A
damaged power cord is a fire and electrical shock hazard.
• Do not remove the unit’s cover. You could receive an
electrical shock. If you think internal inspection, maintenance,
or repair is necessary, contact your dealer.
• Do not modify the unit. Doing so is a fire and electrical shock
hazard.
• If lightning begins to occur, turn off the power switch of the
unit as soon as possible, and unplug the power cable plug
from the electrical outlet.
• If there is a possibility of lightning, do not touch the power
cable plug if it is still connected. Doing so may be an
electrical shock hazard.
In case an abnormality occurs during operation
• If the power cord is damaged (i.e., cut or a bare wire is
exposed), ask your dealer for a replacement. Using the unit
with a damaged power cord is a fire and electrical shock
hazard.
• Should this unit be dropped or the cabinet be damaged, turn
the power switch off, remove the power plug from the AC
outlet, and contact your dealer. If you continue using the unit
without heeding this instruction, fire or electrical shock may
result.
• If you notice any abnormality, such as smoke, odor, or noise,
or if a foreign object or liquid gets inside the unit, turn it off
immediately. Remove the power cord from the AC outlet.
Consult your dealer for repair. Using the unit in this condition
is a fire and electrical shock hazard.
3
CAUTION
Installation
• Keep this unit away from the following locations:
- Locations exposed to oil splashes or steam, such as near
cooking stoves, humidifiers, etc.
- Unstable surfaces, such as a wobbly table or slope.
- Locations exposed to excessive heat, such as inside a car
with all the windows closed, or places that receive direct
sunlight.
- Locations subject to excessive humidity or dust accumulation.
• Hold the power cord plug when disconnecting it from an AC
outlet. Never pull the cord. A damaged power cord is a
potential fire and electrical shock hazard.
• Do not touch the power plug with wet hands. Doing so is a
potential electrical shock hazard.
• This unit has ventilation holes at the rear to prevent the
internal temperature rising too high. Do not block them.
Blocked ventilation holes are a fire hazard.
• To relocate the unit, turn the power switch off, remove the
power plug from the AC outlet, and remove all connecting
cables. Damaged cables may cause fire or electrical shock.
• Allow enough free space around the unit for normal ventilation. This should be: 5 cm at the sides, 10 cm behind, and 10
cm above.
For normal ventilation during use, remove the rear of the rack
or open a ventilation hole.
If the airflow is not adequate, the unit will heat up inside and
may cause a fire.
• To mount several of these units in an EIA-compliant rack,
refer to the rack mounting instructions on page 10.
Operation
• Use only speaker cables when connecting speakers to
amplifier outputs. Using other types of cables is a fire hazard.
• Do not use this amplifier for any purpose other than driving
loudspeakers.
PRECAUTIONS FOR OPERATION – FOR CORRECT OPERATION –
Connector pin assignments
• XLR-type connectors are wired as follows: pin 1: ground, pin
2: hot (+), and pin 3: cold (–).
4
Influence on cell phone usage
• Using a cell phone (mobile telephone) near this unit may
induce noise. If noise occurs, use the telephone away from the
unit.
Introduction
Thank you for purchasing a Yamaha PC9500N, or PC4800N Series Power Amplifier.
The PC Series of power amplifiers was developed from Yamaha’s wealth of experience in building
PA equipment and its tradition of careful attention to every detail of circuit design. These power
amplifiers feature high power and superb quality together with superior reliability and stability,
guaranteeing the highest possible audio performance.
Main features include
• Three modes are provided to support a broad range of applications: STEREO mode which
can be driven by two independent sources, PARALLEL mode in which a monaural source
drives both channels, and BRIDGE mode in which the two internal amps function as a single
mono amp.
• Balanced XLR connector and Euroblock connector inputs, and Speakon connector and fiveway binding post outputs are provided.
•A high pass filter switch that cuts frequencies below 40 Hz, and detented attenuators and
level meters for channels A and B are provided.
• Metering and indicators include easily visible two-channel level meters, a PROTECTION
indicator that shows the state of various protection systems (power on/off detection, output
protection, DC detection), a TEMP indicator that indicates heat sink overheating, and a
REMOTE indicator that indicates the external remote status.
• Variable-speed, low-noise cooling fan system ensures high reliability even under the most
demanding conditions.
This Owner’s Manual applies to the PC9500N and PC4800N power amplifier. In order to take
full advantage of your power amplifier and enjoy long and trouble-free operation, please read this
Owner’s Manual carefully before using your Power Amplifier.
Contents
Introduction ...............................................................5
Controls and Functions ............................................. 6
Front Panel ..........................................................6
Rear Panel...........................................................7
Speaker connections ........................................... 8
Connection ................................................................9
Using a Euroblock connector............................... 9
Speaker Connection ............................................ 9
Air Flow ................................................................... 10
Rack Mounting ........................................................ 10
Specifications ..........................................................11
General Specifications....................................... 11
Block Diagram ................................................... 12
Dimensions ........................................................ 13
Troubleshooting ...................................................... 14
Performance graph ................................................. 14
5
Controls and Functions
■ Front Panel
234
1 8
1 POWER/STAND-BY switch and indicator
This turns the power of the amplifier on/off. When
you press the switch to turn on the power, the indicator will light green.
If the amplifier is connected to an external control
unit and the amplifier has been commanded to enter
STAND-BY mode, this indicator will light orange.
2 REMOTE indicator
This indicator will light green if the amplifier is being
controlled from an external device connected to the
DATA port located on the rear panel.
3 PROTECTION indicator
This indicator lights up red when the protection circuit
is operating. During this time, the amp will be
disconnected from the speaker system, and no sound
will be output from the speaker.
The protection system activates in the following
situations:
• When the amplifier is turned on
The protection system activates for approximately ten
seconds when the amplifier is turned on. After ten
seconds, the protection system deactivates automatically and the amplifier is ready for normal operation.
• If a DC voltage is detected at the amplifier’s
outputs
Turn off the power, and then turn the power back on
again.
• If the amplifier overheats
When this occurs, the TEMP indicator will be lit.
You should turn off the amplifier and allow it time to
cool down. See the Precautions section of this
Owner’s Manual for ways to prevent the amplifier
overheating.
5 776
4 TEMP indicator
This indicator will light red if the heat sink temperature exceeds 85 degrees Celsius.
5 Level meters
These are nine-segment level meters that indicate the
output level of output jacks A and B. If the distortion
of the output signal exceeds 1%, the red CLIP
indicator will light.
6 Volume knobs
These are detented volume knobs that attenuate the
input signals of channels A and B over a range of –∞
– 0 dB.
In BRIDGE mode, only the channel A knob is used.
7 Air intakes
The amplifier has a forced-air cooling fan that takes in
air from the front and exhausts it from the rear. You
must make sure that these intakes are not obstructed.
8 Security cover
If you want to keep the volume settings from being
modified, attach the included security cover using the
screw holes shown below, so that the volume controls
are inaccessible.
6
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