Yamaha MX D1_U D1 Manual E1

User Manual: Yamaha MX-D1 Manual

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MX-D1_U_H1-4.fm Page 1 Wednesday, June 25, 2003 9:45 AM

U

STEREO POWER AMPLIFIER

OWNER’S MANUAL

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IMPORTANT SAFETY INSTRUCTIONS
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.
• Explanation of Graphical Symbols

Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with dry cloth.
Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.

8 Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert you 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.

9 Do not defeat the safety purpose of the polarized or grounding-type

The exclamation point within an equilateral triangle is
intended to alert you to the presence of important
operating and maintenance (servicing) instructions in
the literature accompanying the appliance.

10 Protect the power cord from being walked on or pinched particularly

IMPORTANT!
Please record the serial number of this unit in the space below.
Model:
Serial No.:
The serial number is located on the rear of the unit.
Retain this Owner’s Manual in a safe place for future reference.

CAUTION I

1
2
3
4
5
6
7

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. If the
provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
at plugs, convenience receptacles, and the point where they exit from
the apparatus.

11 Only use attachments/accessories specified by the manufacturer.
12 Use only with the cart, stand, tripod, bracket, or table
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.

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FCC INFORMATION (for US customers)
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
Electronics Corp., U.S.A. 6660 Orangethorpe Ave, Buena Park, CA
90620.
The above statements apply ONLY to those products distributed by
Yamaha Corporation of America or its subsidiaries.

We Want You Listening For A Lifetime
YAMAHA and the Electronic Industries Association’s Consumer Electronics Group want you to get the most out of your equipment by playing
it at a safe level. One that lets the sound come through loud and clear without annoying blaring or distortion – and, most importantly, without
affecting your sensitive hearing. Since hearing damage from loud sounds is often undetectable until it is too late, YAMAHA and the Electronic
Industries Association’s Consumer Electronics Group recommend you to avoid prolonged exposure from excessive volume levels.

CAUTION II

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CAUTION: READ THIS BEFORE OPARATING THIS UNIT
• To assure the finest performance, please read this manual carefully.
Keep it in a safe place for future reference.
• Install this unit in a well ventilated, cool, dry, clean place – away from
direct sunlight, heat sources, vibration, dust, moisture, and/or cold.
Avoid ventilation space of at least 30 cm on the top, 20 cm on the left
and right, and 10 cm on the back of this unit.
• Locate this unit away from other electrical appliances, motors, or
transformers to avoid humming sounds.
• Do not expose this unit to sudden temperature changes from cold to hot,
and do not locate this unit in a environment with high humidity (i.e. a
room with a humidifier) to prevent condensation inside this unit, which
may cause an electrical shock, fire, damage to this unit, and/or personal
injury.
• Avoid installing this unit where foreign object may fall onto this unit
and/or this unit may be exposed to liquid dripping or splashing. On the
top of this unit, do not place:
• Other components, as they may cause damage and/or discoloration
on the surface of this unit.
• Burning objects (i.e. candles), as they may cause fire, damage to this
unit, and/or personal injury.
• Containers with liquid in them, as they may fall and liquid may
electrical shock to the user and/or damage to this unit.
• Do not cover the top panel of this unit with a newspaper, tablecloth,
curtain, etc. in order not to obstruct heat radiation. If the temperature
inside this unit rises, it may cause fire, damage to this unit, and/or
personal injury.
• Do not plug in this unit to a wall outlet until all connections are
complete.
• Do not operate this unit upside-down. It may overheat, possibly causing
damage.
• Do not use force on switches, knobs and/or cords.
• When disconnecting the power cord from the wall outlet, grasp the
plug; do not pull the cord.
• Do not clean this unit with chemical solvents; this might damage the
finish. Use a clean, dry cloth.
• Only voltage specified on this unit must be used. Using this unit with a
higher voltage than specified is dangerous and may cause fire, damage
to this unit, and/or personal injury. YAMAHA will not be held
responsible for any damage resulting from use of this unit with a
voltage other than specified.
• To prevent damage by lightning, disconnect the power cord from the
wall outlet during an electrical storm.
• Do not attempt to modify or fix this unit. Contact qualified YAMAHA
service personnel when any service is needed. The cabinet should never
be opened for any reasons.
• When not planning to use this unit for long periods of time (i.e.
vacation), disconnect the AC power plug from the wall outlet.
• Be sure to read the “TROUBLESHOOTING” section on common
operating errors before concluding that this unit is faulty.
• Before moving this unit, first check that there is no disc in the disc tray.
Finally, press the STANDBY/ON switch to turn off this unit, and
disconnect the AC power plug from the wall outlet.

CAUTION III

his unit is not disconnected from the AC power source as long as it is
connected to the wall outlet, even if this unit itself is turned off. This
state is called standby mode. In this state, this unit is designed to consume a very small quantity of power.

WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

SPECIAL INSTRUCTIONS FOR U.K. MODEL
IMPORTANT
The wires in this mains lead are coloures 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 GREENand-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.

For U.K. customers
If the socket outlets in the home are not suitable for the plug supplied with
this appliance, it should be cut off and an appropriate 3 pin plug fitted. For
details, refer to the instructions described above.

Note: The plug severed from the mains lead must be destroyed, as a plug
with bared flexible cord is hazardous if engaged in a live socket outlet.
For Canadian Customers
To prevent electric shock, match wide blade of plug to wide slot and
fully insert.
This Class B digital apparatus complies with Canadian ICES-003.

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FEATURES
• 500 W + 500 W max. (4 to 8 Ω) high-power, high-performance digital stereo power amp
• 120 dB dynamic range
• Yamaha-designed LSI chips used in the digital-modulation and power-drive circuits
• Active Power Control System ensures optimum performance under any load (4 to 8 Ω)
• Constant Gain PLL Modulator provides a fixed, open-loop gain that is unaffected by supply voltage fluctuations
• 0.003% THD (Total Harmonic Distortion)
• 100 dB channel separation
• Yamaha's own high-efficiency, low-noise resonant-type switching power supply
• WBT (German) connectors used for inputs (RCA/phono) and speaker outputs
• Futuristic, super-thin design

CONTENTS
FEATURES ............................................................................................................................................................................... 1
CONTROLS AND FUNCTIONS............................................................................................................................................. 2
CONNECTIONS....................................................................................................................................................................... 4
BLOCK DIAGRAMS ............................................................................................................................................................... 6
TROUBLESHOOTING ............................................................................................................................................................ 8
SPECIFICATIONS.................................................................................................................................................................... 9

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CONTROLS AND FUNCTIONS
Front Panel

Rear Panel

This mark indicates a dangerous electrically live terminal.
When connecting to this terminal, it is necessary either to have “a person
who have received appropriate guidance on handling” make the connection
or to use a cable that have been manufactured in such a way that the
connection can be made simply and without problem.

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1 STANDBY/ON switch/indicator
This switch is used to set the MX-D1 to on or standby. A small amount of power is used in standby mode.
When the MX-D1 is turned on, this indicator lights blue and the MX-D1 is ready for use.
If a fault is detected, the MX-D1's protection system activates and this indicator lights red. If this happens,
set the MX-D1 to standby mode immediately.

2 SPEAKER terminals
These terminals are for connecting your speakers.
They provide a reliable connection even with really
thick cables. Be sure to connect the left and right
channels, and the speaker polarities (+/-) correctly.
You can connect speakers with impedance of between
4 to 8 ohms.

3 BALANCE jacks
If your source component has balanced XLR output
jacks, connect them to these jacks using XLR cables.

4 UNBALANCE jacks
If your source component has unbalanced RCA/
phono jacks (labeled “AUDIO OUTPUT” on the
YPC-1), connect them to these jacks using an audio
pin cable.

5 UNBAL/BAL switch
With this switch you can select the BALANCE jacks
or the UNBALANCE jacks.

6 MUTE button

7 RS-232C terminal
This terminal is for servicing purposes only.

8 AMP ID switch

This switch is for servicing purposes only.

9 CONTROL IN jack
The MX-D1 can be turned on or off via this jack.
The control range is +3 to +30 volts.

0 CONTROL OUT jack
When the MX-D1 is turned on, this jack outputs +12
volts. The maximum current is 15 mA.

w POWER/THROUGH switch
This switch determines the operation of the
CONTROL IN/OUT jacks. When using the MX-D1
as the master component, set this switch to “POWER”.
When using it as a slave component, set it to
“THROUGH”.

e AC IN connector
Connect the supplied AC power cable here.

You can temporarily mute the output from the MX-D1
by holding down this button. If you need to change
any input connections while the MX-D1 is still on,
you can protect your speakers against sudden loud
noises, thumps, and clicks by keeping this button
pressed while making such changes.

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CONNECTIONS
Pre-amplifier
CD player with a volume control
PA equipment
Balanced XLR output

To AC outlet

Audio output
YPC-1

Speaker (R)

Speaker (L)

CD player
etc.
Tape deck
etc.
Tuner

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Connecting Your Speakers
Speaker cables typically consist of two insulated conductors. To ensure that the speakers are connected with the correct
polarity (+/-), the insulation on one of the conductors is a different color or is marked with a line.

Preparing the speaker cables
1. Strip about 15 mm of insulation from the ends of the speaker cables.
2. Twist the bare wires tightly.
To prevent a short circuit, make sure the bare wires are twisted tightly.

15mm

Connecting the speaker cables
1. Unscrew the SPEAKER terminals.
2. Insert the twisted bare wires into the holes on the SPEAKER terminals.
3. Screw the SPEAKER terminals tight.

Red: + (positive)
White: - (negative)

Connecting Your Source Components
Connecting to the BALANCE jacks
Connect your component with the balanced XLR output jacks.
The pin assignments for these jacks are shown below. Refer to the owner’s manual of your component and verify that its
output jacks are compatible with the pin assignments for these jacks.
When connecting, match the pins and insert the connector of the XLR cable until you
hear a “click.”
When disconnecting, pull out the XLR cable while holding down the lever of the
BALANCE jack.

2: hot

When using this balanced connection, set the UNBAL/BAL switch to “BAL.”
3: cold
1: ground

Connecting to the UNBALANCE jacks
Connect your component with the unbalanced RCA/phono output jacks.
When using this unbalanced connection, set the UNBAL/BAL switch to “UNBAL.”

Caution
Note that if you input signals to the BALANCE jacks and UNBALANCE jacks at the same, cross talk may occur between
these input jacks.

Connecting the AC Power Cable
Plug the AC power cable into the AC IN connector when all connections are complete, and then plug in the AC power cable
to the AC outlet.

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BLOCK DIAGRAMS
The MX-D1 is a high-power, high-performance PWM (Pulse Width Modulation) digital stereo power amp, utilizing Yamaha's
latest digital power amplifier and switching power supply technologies.
The following block diagrams show the amplifier and power supply circuits.

Amplifier Block Diagram
+B

YDA134

2.8 MHz
clock input

YDA133

Output current information

Real-time
protection

Constant-gain
PLL
modulator circuit

Input amp

IN

Active power
control

Protection
/mute

L

SPOUT

C

YDA134

Analog
feedback

0V
Closed-loop
feedback

Real-time
protection

-B

Power Supply Block Diagram
+
0V

For op-amps
and LSI

-

Driver

100V(on)
200V(off)

+B

OV

-B
Driver
Isolator
Choke

AC IN

2.8MHz
(amp)

88kHz

Line filter

Subtransformer
Inrush
protection circuit

Protection circuit

OSC

88kHz

Right-channel power supply

E-6

Magnetically
-coupled
rectifier circuit

Microcomputer

External interface

2.8MHz
(amp)

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PWM (Pulse Width Modulation), which theoretically produces zero quantization noise, a dynamic range that is dependent only on circuit technology, and
feedback all combine to make the MX-D1 a superb high-performance power amp.
In addition, the Yamaha high-performance, high-speed analog and digital LSI chips are designed to optimize the performance of the modulator and
MOSFET drive circuits that form the heart of the MX-D1.

Active power control system
By continuously monitoring the amp's output current and controlling the maximum continuous output power and
instantaneous dynamic power, the MX-D1 always delivers maximum performance with any load impedance between 2 to
8 ohms.

Constant-gain PLL modulator circuit
With a conventional digital power amp, the output is adversely affected by fluctuations in power supply voltage as the
current demands of the amp change. The MX-D1's modulation circuit, consisting of a PLL (Phase Locked Loop) and
modulation circuit, provides a radical solution to this problem.
In response to power supply voltage fluctuations, the constant-gain PLL modulator circuit produces a pulse-width
modulated waveform by modulating the input signal at a suitable rate. In this way, linearity is maintained and the openloop gain is fixed, providing stable feedback.

Feedback
Digital output pulses are fed back in a closed-loop feedback circuit, which improves the performance of the modulator
circuit and the linearity of the output stage, providing very low distortion and a wide dynamic range.
In addition, an analog output signal taken from after the LC output filter is fed back to ensure a high damping factor and a
wide frequency response that is unaffected by the load impedance.

Protection system
The protection system, which guarantees safe operation, includes a super-fast current detection circuit that can measure
the current of a single pulse. It also includes safe operating sequential logic, DC detection, and over-current protection.

Switching power supply
Independent, high-efficiency, low noise resonant-type switching power supplies, developed by Yamaha, are used for the
left and right channels.
In addition, the secondary rectifier circuit has a magnetically coupled rectifier, which resolves issues normally associated
with conventional SEPP (single-ended push-pull) digital amps and allows the MX-D1 to always maintain perfect
symmetry between the positive and negative power supply rails regardless of the direction of the output current.

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TROUBLESHOOTING
If your MX-D1 does not appear to be working properly, look up the symptoms in the following table. If the symptoms persist, or are not listed, set the MX-D1 to standby mode, disconnect the AC power cable from the AC outlet, and then contact
the nearest Yamaha dealer.
Symptom
Cannot turn on the MXD1?

Remedy

The AC power cable is not connected
properly.

Make sure the AC power cable is connected
properly to the AC IN connector and a
suitable AC outlet.

The component connected to the
CONTROL IN jack is not turned on.

Turn on the component that is connected to
the CONTROL IN jack.

The MX-D1 is not connected properly.

Check all connections and correct as
necessary.

The source component connected to the
MX-D1's input jacks is not set correctly.

Refer to the owner’s manual of the source
component.

The wrong inputs are selected on the MX-D1.

Use the UNBAL/BAL switch to select the
correct inputs.

The MX-D1's protection system is active.

Check the speaker cables for short circuits
and correct as necessary.

A hum can be heard?

The audio pin cable connected to the
UNBALANCE jacks is not fully inserted.

Fully insert the audio pin cable.

The output sounds
unnatural, has a limited
bass range, and poor
stereo image?

The speaker polarity is wrong.

Check the polarity of the speaker
connections and correct as necessary.

There is no sound?

E-8

Cause

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SPECIFICATIONS
Maximum output...................... 500 W + 500 W (4 to 8 Ω)

Output ............................. SEPP (Single-Ended Push-Pull)

Dynamic power..................... 1000 W + 1000 W (4 to 8 Ω)

Power source......... Resonant-type switching power supply

Damping factor................................................ or more 200

(frequency: 88 kHz)

Total harmonic distortion............... or less 0.003% (1 kHz)
Dynamic range........................................... or more 120 dB
(IHF-A, LPF: 20 kHz)

CONTROL OUT

Frequency response.................... 1 Hz to 100 kHz (+ 3 dB)
20 Hz to 20 kHz (+0.5 dB)

Power off ...................................................................... 0 V

Channel separation..................................... or more 100 dB
(5.1 kΩ terminated, 1 kHz)

Power supply

Input jacks
UNBALANCE........................ Unbalanced 1.3 V/25 kΩ
BALANCE .................................... Balanced XLR 1.3 V
Pin 2 hot

Power on .......................................... +12 V (Max. 15 mA)

U.S.A and Canada models ...................... AC 120 V, 60 Hz
Australia model....................................... AC 240 V, 50 Hz
U.K. and Europe models......................... AC 230 V, 50 Hz
China and Korea models......................... AC 220 V, 60 Hz
Asia model.................... AC 110/120/220/240 V, 50/60 Hz
Power consumption ................................................. 350 W

Output jacks
SPEAKER ................. Supports standard speaker cables,
banana plugs, and Y plugs

Power consumption in st.andby mode............ or less 0.1 Ω
Dimensions (W x H x D)..................... 435 x 75 x 437 mm
(17-1/8” x 2-7/8” x 17-3/16”)
Weight ............................................ 10.4 kg (22 lbs. 15 oz)

Modulation ..................... PWM (Pulse Width Modulation)
Accessory

AC power cable
Specifications are subject to change without notice.

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MX-D1_U_H1-4.fm Page 2 Wednesday, June 25, 2003 9:45 AM

YAMAHA
YAMAHA
YAMAHA
YAMAHA
YAMAHA
YAMAHA
YAMAHA

ELECTRONICS CORPORATION, USA 6660 ORANGETHORPE AVE., BUENA PARK, CALIF. 90620, U.S.A.
CANADA MUSIC LTD. 135 MILNER AVE., SCARBOROUGH, ONTARIO M1S 3R1, CANADA
ELECTRONIK EUROPA G.m.b.H. SIEMENSSTR. 22-34, 25462 RELLINGEN BEI HAMBURG, F.R. OF GERMANY
ELECTRONIQUE FRANCE S.A. RUE AMBROISE CROIZAT BP70 CROISSY-BEAUBOURG 77312 MARNE-LA-VALLEE CEDEX02, FRANCE
ELECTRONICS (UK) LTD. YAMAHA HOUSE, 200 RICKMANSWORTH ROAD WATFORD, HERTS WD18 7GQ, ENGLAND
SCANDINAVIA A.B. J A WETTERGRENS GATA 1, BOX 30053, 400 43 VÄSTRA FRÖLUNDA, SWEDEN
MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA

Printed in Japan

WC01600



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