Yamaha PC4002M User Manual [en, de, fr]

PROFESSIONAL SERIES POWER AMPLIFIERS

PC4002/4002M

OPERATING MANUAL

MODE D'EMPLOl

BEDIENUNGSANLEITUNG

Vjum

mramswd

.mm. «a»

. Oc

YAMAHA

ABOUT THIS MANUAL

The PC4002I4002M are high-power, high-quality power am­ plifiers, designed for professional use. As with any power amplifier, the overall performance of the PC4002j4002M de­ pends to a certain extent upon the system design and instal­ lation, as well as on its own capabilities. Hence, this manual has been written with system installation in mind, as well as describing the operation and performance of the PC4002I4002M.

It is recommended that you read the whole of this manual, but if you are adding a PC4002I4002M to an existing system, and you are familiar with the operation of high-power amplifiers, pages 3 through 4 contain all the information necessary for basic connection and operation.

IMPORTANT NOTICE FOR THE UNITED KINGDOM

Connecting the Plug and Cord

IMPORTANT:Tlie wires in this mains lead are coloured in accordance with the following code:

Blue NEUTRAL

Brown LIVE

As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured miu'kings identifying the terminals in your plug proceed as follows:

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.

Making sure that neither core is connected to the earth terminal of the three pin plug.

PRECAUTIONS

•Avoid placing the unit in locations exposed to direct sunlight or high temperatures, excessively high or low humidity, high dust concentraion, or vibration.

•Be sure to connect to an AC power supply that meets the power supply specifications listed on the rear of the unit.

•If there is any danger of lightning occurring nearby, remove the power plug from the wall socket in advance.

•To avoid damaging your speakers and other playback equip­ ment, turn off the power of all related equipment before making connections.

•Do not use excessive force in handling control switches and knobs.

•To avoid broken cords and short circuits, be sure to unplug all connectors by grasping the respective plugs—NOT the cords.

•Remove the power plug from the AC mains socket if the unit is not to be used for an extended period of time.

•Remove all plugs and connections if the unit is to be transported, to prevent damage to the cords and jacks.

•Do not use solvents such as benzene or paint thinner to clean the unit. Do not use insecticides or other pressurized spray products in proximity to the unit. Wipe off the exterior with soft cloth.

•The XLR (Cannon) type Input connectors are wired in the fol­ lowing configuration: Pin 1: GROUND. Pin 2: HOT. Pin 3: COLD. Ensure that all equipment connected to the PC4002/4002M matches this wiring.

CONTENTS
INTRODUCTION .....................................................................	2
FRONT PANEL .......................................................................	3
REAR PANEL .........................................................................	4
INSTRUCTIONS FOR CONNECTION OF
SPEAKER CABLES ...............................................................	5
GENERAL SPECIFICATIONS ...............................................	6
PERFORMANCE GRAPHS ...................................................	7
MOUNTING .............................................................................	8
INSTALLATION PRECAUTIONS ..........................................	9
CLEANING THE FAN FILTER ELEMENTS ........................	10
BLOCK DIAGRAM ..............................................................	11
DIMENSIONS .......................................................................	12

INTRODUCTION

The PC4002/4002M are top-quality, high-power ampli­ fiers, and with their impressive output combined with low distortion figures, are ideally suited to studio monitoring use, but at the same time are rugged enough to act ad­

mirably	as a professional amplifier where top quality			is
required. Their features include:
Large, illuminated peak meters (PC4002IVI only) for
instant confirmation of output levels. In addition			to	the
meters,	which provide a faster response	than VU	meters,
LED clip	level indicators are provided for	instant	signalling

of clipping.

Front panel status indicators show the following:

if		bridged (BTL) operation		has been	selected,		high-speed
fan		operation, and	overload/power-up		muting,		as	well	as
a	power indicator. The power switch				is	recessed		into	the
front panel, to prevent accidental resetting.
Decibel-calibrated			input	attenuators,		detected			for

extra accuracy. This makes for predictable and repeatable setting-up on the road, and accurate input sensitivity ad­

justments. In multi-amplifier setups, precise tracking					be­
tween amplifiers can be easily		achieved.	Input attenuator
knob locks prevent accidental resetting of levels.
Power-up	muting for about six seconds		after	the	power
has been	turned on gives protection to		speakers		after
power-on,	avoiding the "thump"	which can		easily	blow
out cones.

Each channel is provided with input connectors

which are male and female balanced XLR, as well as bal­ anced 1 /4-inch phone (using a TRS-type connector). This

allows	convenient	bridging to		another amplifier,			as	well
as adapter-free connection to almost any mixer.
Speaker terminals		are	screw-post type,			with the ability
to accept heavy-gauge speaker cable for maximum fidelity.
An	automatic	two-speed		quiet	twin-fan		cooling
system prevents thermal overload, and cuts in at							the	low
speed	when heat-sink		temperatures		exceed	60°C,	and	at

high speed above 80°C. The washable fan		filters	are	re­
movable from the	front panel, eliminating the need to re­
move the amplifier	from a rack when the	filters	need	to
be cleaned.

Robust mechanical		design	for	practical	use.	The
PC4002/4002M	is, of	course,	19"	rack-mountable,		with
front handles	which	also help	protect the		controls	and

meters. Though designed to be extremely reliable, and to withstand the rigours of life on the road, if access is ever needed to the interior of the unit, this has been made easy,

with	bulb	replacement, meter adjustment, etc, being			pos­
sible	from the front		panel.	Power-cable hooks also act as
a support if the amplifier is				used in a vertical position, and
four feet ensure airflow if				the amplifier is shelf-mounted.
Multiple		protection	circuits	safeguard the amplifier	and

speaker system against abuse and faulty connections.

Twin power supplies and transformers for the power amplifier stage add reliability and add quality to the sound of the PC4002/4002M.

Bridged mode (BTL) from the A channel input is easily obtained by the use of one switch on the back panel, and connecting the ( + ) terminals of the CH-A and CH-B speaker outputs to one speaker.

Figures that match the features. With		a THD	of	less
than 0.005% at 215W into 80,	and a figure which is			still
less than 0.01% at 700W	(mono)	into	80,	the
PC4002/4002M is one of the	cleanest	high-power		am­

plifiers on the market - making it especially useful for studio monitoring operation. Channel separation, damping factor and signal/noise figures are as good as or better than you

would normally expect from an amplifier of	this calibre,
while the slew rate is an impressive 60V/ixS	(stereo)-fast
enough to handle the fastest transients.

FRONT PANEL

Rack Handle

Q KNOB LOCKS’

O POWER SWITCH/POWER INDICATOR (RED)
Push this switch to turn the power ON,	and push	it	again
to turn the power OFF. The red power indicator		will	light
when power is supplied.
©PROTECTION INDICATOR (RED)
This indicator will illuminate under two	sets of	circum­
stances: when power is first applied, a	muting	circuit is

in operation for about six seconds after power-up, to avoid damage to speakers. This indicator will be lit at this time.

Additionally,

if

the protection circuitry is activated for

any

reason (for

instance,

if a DC voltage exceeding ±2V

ap­

pears

at

the

output

terminal), the speaker outputs will

be

shut

off,

and

this indicator

will

go

on.

It will

stay

on

for

as long as power is applied and

the condition which

caused

the

protection

circuit

to

activate

still

applies.

Once

the

condition has been remedied, the indicator will go off, and normal operation will be resumed.

©THERMAL FAN INDICATOR (RED)

If the fans are operating at high speed (ie a heat-sink temperature of 80°C has been attained), this indicator will go on.

O BTL INDICATOR (GREEN)

This indicator will be lit if the BTL (mono bridging rtiode) switch on the back panel has been set ON.

Rack Handle

PC4002 ONLY

©PEAK METERS (PC 4002M ONLY)

These large illuminated meters give a peak reading of the output level from the amplifier. The bulbs illuminating these

meters		are	replaceable	without		soldering		from		the	front
panel.		The meters' zero points may					also	be adjusted			from
the front panel.
SIGNAL INDICATORS (GREEN) (PC4002 ONLY)
These		signal	indicators	light	when the output				signal		level
is	2V	or more (in the frequency					range 20Hz-20kHz) to
confirm the input signal.
©CLIP INDICATORS
These		LED	indicators light		up	when	the	output		distortion
of the respective channel reaches a level of about 1 %.
© INPUT ATTENUATORS
These		allow attenuation of the input signals in IdB cali­
brations from 0-20dB,				and	in	2dB	calibrations			thereafter.
The	controls		are detented for a positive					feel,	and to		help
with replicating settings.

© KNOB LOCKS (supplied)

Push these locks over the attenuation controls to prevent accidental resetting of the levels. Pull them off again if you need to reset the levels.

REAR PANEL

Cord Reel

O SPEAKER TERMINALS (FOR EACH CHANNEL)

The red speaker terminal should be connected to the "+"

terminal of the speaker system,						and the	black	terminal		to
the	channel.		(In	the	above	illustration,	terminal		covers
are not shown. See page 5)
©GROUND LIFT SWITCH (FOR EACH CHANNEL)
Connects		or	isolates	the	ground	of XLR-pin 1.		Usually		left
ON. However, in some cases where ground								loops		are
causing		hum,	"lifting" the ground by turning					this	switch
OFF can interrupt the loop, thereby reducing hum.
©INPUT CONNECTORS (XLR-3-31)
These	female		input	connectors are usually			used	as	inputs.

They are wired: Pini =ground, Pin2 = hot, Pin3=cold. Compatible connectors include ITT-Cannon XLR-3-12C, Switchcraft 5C-1055A and Neutric NC3MX.

Cord Reel

©INPUT CONNECTORS (XLR-3-32)
These	male inputs duplicate the female input connectors
(same	wiring), but are usually used for					retransmitting the
input	signal	to	other	amplifiers.	Compatible		connectors
include	ITT-Cannon XLR-3-11C,				Switchcraft		5C-1056A
and Neutric NC3FX.
O PHONE INPUT CONNECTORS
These	1 /4-inch balanced TRS connectors accept balanced
and	unblanced		input	signals.	Tip=hot,		Ring=cold,
Sleeve=ground.
© MODE SELECTOR SWITCH (BTL)
When	set to MONO, this switch allows bridged (mono)
operation of		the	amplifier. The speaker			terminals		should
be connected to the" + "				terminals	of both channels (CH-A
to the	speaker "+" and CH-B to				the speaker "-"). When
using	the	PC4002/4002M		in BTL	(MONO) mode,			con­

nection should be made to CH-A input only.

INSTRUCTIONS FOR CONNECTION OF SPEAKER CABLES

1. Make sure the power to the amplifier is OFF	Screw

2.Unscrew the covers over the speaker terminals (Terminal covers are not installed in USA model)

3.For each cable, strip the insulation off one end of the speaker cable for about 10mm and twist and tin the wires. Pass the tinned wires through the terminal hole and tighten the screw to grip the cable in place.

4.Replace the covers over the speaker terminals. Make sure that the speaker cables are fed down through the gap at the bottom of the cover, and are not pinched or trapped by the covers.

expozed to touch the chassis or cover.

5.If all other components are connected, turn on the amplifier.

GENERAL SPECIFICATIONS

These specifications are measured when the distortion of the AC Voltage is less than 1 %.

POWER OUTPUT LEVEL

Continuous average sine wave power with less than 0.05% THD. 20Hz - 20kHz

Stereo 8Q ...................................................		430W+430W
Stereo 4Q .....................................................		700W+700W
Mono 8Q.................................................................		1400W
FREQUENCY RESPONSE
Stereo, @ 8Q, 1W ....................	10Hz - 50kHz OdB + ldB
Mono, @ 8Q, 1W .....................	10Hz - 50kHz 0dB±1dB
POWER BANDWIDTH
Stereo, 215W, 8Q, 0.1% THD ........................		10Hz - 100kHz
Stereo, 350W, 4Q, 0.1% THD .......................		10Hz - 100kHz
Mono, 700W, 8Q, 0.1% THD............................		10Hz - 100kHz
TOTAL HARMONIC DISTORTION
Stereo, 215W, 8Q,
20Hz - 20kHz ......................................		............... < 0.005%
Stereo, 350W, 4Q,
20Hz - 20kHz........................................................		< 0.01%
Mono, 700W, 8Q,
20Hz-20kHz........................................		.................. <0.01%
INTERMODULATION DISTORTION
Stereo, 215W, 8fì,
60Hz:7kHz=4:1 ..................................................		< 0.005%
Stereo, 350W, 4i2,
60Hz:7kHz=4:1 ....................................................		<0.01%
Mono, 700W, 8£î,
60Hz:7kHz=4:1 ....................................................		< 0.01%
CHANNEL SEPARATION
(Input ATT max, input 600Q Shunt)
215W, 20Hz - 20kHz
@ 8Q...........................................	...........................	> 80dB
DAMPING FACTOR
1kHz @ 8ÎÎ..................................	.............................	> 300
S/N
Input 600Î2 Shunt @ IHF-A .	........................ > IIOdB
RESIDUAL NOISE
ATT at min, @ 12.7kHz, -6dB/oct LPF.......................		< 75dB
ATT at min, IHF-A network......................................		< 80dB
SLEW RATE
Stereo, 8Q...................................		... +60V/) .iS, Full Swing
Mono, 8Q ...................................		±100V/pS, Full Swing
SENSITIVITY
ATT max, 400W 80 @ 1 kHz .	............... +4dB (1.23V)
INPUT IMPEDANCE
Balanced/unbalanced...................	................. ..........	>15kO

MAXIMUM VOLTAGE GAIN
Input ATT maximum, @ 1kHz		33.3dB
METERS (PC4002M ONLY)
Large illuminated		-50dB - +7dB
peak level meters x 2	................	0dB = 160W@8Q
INDICATORS
Green signal LED	x 2	Illuminate when signal
(PC4002 only)		outputlevel goes above 2V.
Red clip LED x 2 ...	................. Illuminate when output
		distortion from channel
		exceeds approx 1 %
Green BTL LED x 1	..................	Illuminates when BTL
		(mono) mode is selected
Red thermal fan.........	...............	Illuminates during high-
LED X 1		speed fan operation
Red protection...........	....... Illuminates during protection
LED X 1	or muting circuit operation
Red power LED x 1	......... Illuminates when power on
PROTECTION CIRCUIT
Muting............................	6 .sec (±2 sec) after power-on
DC sensing .........................	....... DC +2V output voltage
PC limiter ............................................................		RL < 2Q
Thermal ...................................	> 100°C Heat Sink Temp

COOLING FAN SPEED CIRCUIT

All temperatures refer to heat-sink temperature

Off to Low speed .....................................................	< 60°C
Low speed ................................	Cuts in above 60°C. Cuts
	out when heat-sink temperature
	drops below 45°C.
High speed.............................	Cuts in above 80°C. Drops
	to low speed when heatsink
	temperature drops below 65°C.
POWER REQUIREMENTS
General model ...........................	220/240V AC 50/60Hz
US&Canadian models ................................	120V AC 60Hz
POWER CONSUMPTION
General model .......................................................	1600W
US&Canadian models ..............................	1600W, 2000VA
DIMENSIONS
(W X H X D)................................	480 X 185.6 x 460 (mm)
	(18-7/g"x 7 5/i6"x 18-1/8")
WEIGHT
43 kg (94.8 lbs)
SUPPLIED ACCESSORIES
KNOB LOCK X2
3mm, ALLEN KEY x 1

PERFORMANCE GRAPHS

T.H. DISTORTION VS. OUTPUT POWER	T.H.DISTORTION VS OUTPUT POWER
LOAD : 80
MODE : STEREO	LOAD : 80

10	100	1K	10	100	IK
	POWER(W)			POWER(W)
DAMPING FACTOR VS FREQUENCY			FREQENCY RESPONSE		LOAD ; 80
					MODE ; STEREO
		LOAD : 80			OdB = 1W

100	IK	10K	20	100	1K	10K
	FREQ.(Hz)				FREQ.(Hz)
T.H.D. VS FREQUENCY		LOAD : 80	CHANNEL SEPARATION			LOAD : 80
		MODE ; STEREO				OdB = 200W
		Po = 200W coni.				Measuring ch.
						input 6000 shunt ATT.Max.

m TO

		-50
		-90
100	IK	10K	IK	10K
	FREQ.(Hz)	100
			FREQ.(Hz)

MOUNTING

When installing	the	PC4002/4002M,	take	care		to	avoid
radiant heat. Since the amplifier is			fitted	with		twin	fans
cooling system, do not block the front and rear panels.
SHELF MOUNTING
The PC4002M can	be	used on any flat, level		surface as			long
as there is adequate ventilation.			Do not		remove		the
amplifier's feet as this would block			airflow		through		the
bottom panel.
		PC4002M

PORTABLE RACK MOUNTING

Road cases must be durable enough to withstand rough handling and airline travel. Use a vented blanking panel (1 Usize) at the bottom of the PC4002M (like that below).

Air Flow	Air Flow
Shelf
Shelf mounting
PERMANENT-INSTALLATION RACK MOUNTING
The PC4002M can be mounted in any	standard 19	elec­
tronic equipment rack. The rear panel	of the rack	should

be left open to promote smooth airflow. Refer to the dia­ grams below for the ideal cooling configuration.

*One vented blanking panel (1 U size) is necessary for each PC4002M.

PC4002M-	1U size vented
	blanking panel

Rack mounting with vented Blanking panels

liii[IIIIIiiiiiiiIIIIIImilIImilIIIIIIIIIII

Unit : mm

Blanking panel

YAMAHA	VP1	Ventilation	panel	may he provided as an
optional accessory, (open			area	should	be at	least 35%	of
total area)
----------------------------		CAUTION! ---------------------------------------
If unit(s)	are	to be used	in a	rack	mounted	installation,	it

is recommended that Unit(s) should be used with vented blanking panel(s) as above.

INSTALLATION PRECAUTIONS

• If you are using long speaker cables, use the heavy gauge cables which are practical, in order to prevent

damping	factor deterioration and/or				power loss
through	the	cable.	The	PC4002/4002M's		speaker
terminals	allow	you	to use	even the	heavy	gauge
cables.

•The PC4002/4002M produces 430W + 430W (into

Sohms)	in stereo	mode, and 1400W (into Sohms)
in mono	mode, so use a speaker system which has
sufficient	capacity	to handle this power comfortably.

You can protect speakers of lower rated input capacity

than	the	rated output power		of the	PC4002/4002M
by	connecting a fuse directly between the speaker
and	amplifier		(see illustration).	When	using a	system
such	as	the	one illustrated, follow the procedure on
this	page	to	determine the capacity		of the	fuse to

be used.

PO = |2R

PO: Speaker continuous input power capacity (Noise or RMS)

R:Nominal impedance of speaker

I:Required fuse capacity (A) l = yP0/R

Example

Speaker continuous input power capacity 100W

Speaker impedance Sohms

In this example l=yi00/8 l==3.5A

IF THE CUPPING AND PROTECTION CIRCUIT OPERATION INDICATORS LIGHT UP

	Indicator	Cause			Check				Protection Circuit Oper­
									ation
		Short in speaker termi­		Examine		the	places		The PC limiter is in op­
	Clip Indicator	nal, amplifier output ter­		where shorting may have					eration, protectiong the
		minal, or cable		occurred					power transistors
				Make sure the speaker
				system	impedance			is
		Amplifier overloaded		more than 4ohms when					The same as above
				in stereo		mode,		and
				Sohms	when		in mono
				mode
				Check	the	airflow		and	The thermal protection is
		Heatsink	temperature	take appropriate meas­
	Protection indicator								in operation, protecting
		exceeds 100°C		ures	to	keep		the
									the Power transistors.
				amplifier(s) cool
		A DC voltage of more		Contact your			YAMAHA		The protection relay is in
		than Ì2V	has occurred	distributor		or	service		operation, protecting the
		at the output terminals		center					speaker system

CLEANING THE FAN FILTER ELEMENTS

1.Make sure the power to the amplifier is OFF.

2.Remove the power plug from the AC mains socket.

3.Use the supplied 3mm Allen key (hex wrench) to remove the four hex bolts securirig the front filter grilles.

4.	Remove the		filter	elements,	and wash	in	plain	water. If
	the filter elements are exceptionally dirty,							detergent
	(washing-up liquid) may be used.
5.	Dry	the filter		elements	thoroughly.	NEVER		REPLACE
	THE	FILTER	ELEMENTS		WHILE THEY		ARE STILL
	WETI
	Replace the elements and front filter grilles. (The re­
	placement part number of the filter element is Vi 31380.)

10

о

о

о

>

о

70

>