Sony MU-A400 User manual

SON'Y.
Power Amplifier
MU-A400
MU-A200 — :
Operating Instructions .,..:
Before operating the unit, please read this manual thoroughly
and retain it for future reference.
Mode d’emplol pace
Avant la mise en service de cet appareil, veuillez lire
attentivement ce mode d’emploi et le conservez pour toute
référence
ultérieure.
:
Bedienungsanleitung sei 2
Lesen Sie vor der Inbetriebnahme diese Anleitung sorgfaltig
durch und bewahren Sie sie zum spateren Nachschlagen gut
aul.
©1991 by Sony Sound Tec Corp.

WARNING
English
To prevent fire or shock hazard, do not expose the unit to
rain or moisture.
To avoid electrical shock, do not open the cabinet. Refer
servicing to qualified personne! only.
NOTICE FOR THE CUSTOMERS IN THE UNITED
KINGDOM
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 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.

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Specifications ............cccsccessseeeeseneseenseseseeees
Block Diagrams
DiMe@NSIONS. .............:csccceesreeeescceeseceeenreees
Location and Function of Controls
Connection Examples ...........-ssccsees
Troubleshooting Guide ...............:eeeeeee
Precautions
On Installation
Avoid installing or leaving the unit in a location:
¢ near heat sources such as radiators, airducts or heaters
® subject to direct sunlight :
© exposed to rain or moisture
e where it is unventilated
© exposed to excess dust or dirt
* subject to mechanical vibration or shock
On Operation
© Operate the unit only on 220-240 V AC, 50/60 Hz.
¢ Unplug the unit from the wali outlet when it is not to be used
for an extended period of time. To disconnect the cord, pull ~
it out by grasping the plug. Never take out the plug by
puiling on the cord. ;
© Should any solid object or liquid fall into the component,
unplug the unit and have it checked by qualified personnel
before using it again.
¢ Clean the cabinet, panel and knobs periodically using a soft
cloth moistened with a miid detergent. Never use an
abrasive cleanser or chemical solvents as they may mar
the finish.
If you have any questions or problems concerning your unit
that are not covered in this manual, please consult your
nearest Sony dealer.

Specifications
Channel 2 channels
Input
sensitivity
OdBs
(100W
+100W,
8
ohm
load
impedance,
both
channels
driven
simultaneously)
Unbalanced
Electronic balanced circuit
More than 33 kilo-ohms
(stereo operation)
More than 33 kilo-ohms
(monaural operation)
Connector and XLR-3-31 type XLR-3-31 type
jack Phono type
| __item ——|Stereo | Monaural (BTL)
Output terminal Screw type binding terminal
Rated output* MU-A400
260 W + 260 W 520 W (16 ohms)
(8 ohms) 800 W (8 ohms)
400 W + 400 W
(4 ohms)
(both channels
driven
simultaneously)
Input
impedance
130 W +130 W
(8 ohms)
200 W + 200 W
(4 ohms)
(both channels
driven
simultaneously)
Power
bandwidth 20 Hz - 20 kHz+0.5 dB
Damping factor | More than 150
(8 ohms, 1kHz)
Harmonic
Less
than
0.1%
|
Less
than
0.1%
distortion
(8ohms,
at
100
W
|
(8
ohms,
at
200
W
output)
output)
More
than
70
dB
(1kHz:
8
ohms
load,
at
rated
output)
260 W (16 ohms)
400 W (8 ohms)
Channel
separation
Residual
noise
|
Less
than
100
)V
|
Less
than
200
pV
(IHF-A,
input
(IHF-A,
input
terminated)
terminated)
31 4B
Stacking output
0 dBs= 0.775 V
“1
%
harmonic
distortion
at
1kHz
Indicator 10-point LED level meter
PROTECTION indicator
HIGH TEMP indicator
CLIP indicator
POWER indicator
Power requirements 220 - 240 V AC, 50/60 Hz
Power consumption §MU-A400: 805 W
MU-A200: 425 W
Dimensions MU-A400:
Approx. 482 x 146 x 490 mm
(w/h/d) _
(19 x 4 9/6 x 19 5s inches)
MU-A200:
Approx. 482 x 102 x 490 mm
(w/h/d)
(19 x 4 Ve x 19 /s inches)
Weight MU-A400: Approx. 20.5 kg
_(45 Ibs 2 oz)
MU-A200: Approx. 15 kg
(33 Ibs 2 02)
Accessories supplied AC power cord (1)
Fuse MU-A400: 8A (1)
; MU-A200: 4A (1)
This appliance conforms with EEC Directive 87/308/EEC regarding
interference suppression.
Design and specifications are subject to change without
notice.

Block Diagrams
PROTECTION HIGH TEMP
Z,
BAL/UNBAL CY oY
OPERATION CLIP
4 4
CH
1
MONO
INPUT
o——-——0
®
CH2
2
2
OUTPUT
MONO
cH.
o———0®
cHe
INPUT
f°
2
OUTPUT
CIRCUIT
PROTECTION
. '
7 Fe ix fey)
BAL/UNBAL SW. OPERATION SW
7 PROTECTION HIGH TEMP
BAL
MONO o
—o~c—! SAME OUTo
UNBAL STEREO
MU-A400 : 408.5
MU-A200 : 406.5
MU-A400 MU-A200
MU-A400 Unit: mm
MU-A200

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Front Panel.
[41] CLIP indicator
[2] HIGH TEMP indicator
[3] PROTECTION indicator
[4] OPERATION indicator
[5] ATTENUATOR knob
[6] Level meter
POWER switch and pilot lamp
Ventilation hole
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[1] CLIP indicator (red)
Lights
when
the
output
wave
is
distorted.
When
the.
indicator lights frequently, the input level is too high or
there is a problem in the input channel.
[2] HIGH TEMP(temperature) indicator (red)
Lights when the temperature of the heat sink becomes
too high. Take a measure to be well ventilated.
[3] PROTECTION indicator (red)
Lights when the protection circuit is working. When you
turn on the amplifier, the indicator lights but goes off
when the unit starts to work steadily.
[4] OPERATION indicator (green)
Shows the operation mode set by the position of the
OPERATION switch on the rear panel.
STEREO
SAME OUT Lights Lights
See 2
has the same
signal as
CHANNEL 1.
(monaural)
Monaural
through BTL
[5] ATTENUATOR knob
CHANNEL 1 (MONO): Turn this knob to control the
channel 1 input level. You can control the input level
with this knob when you are using the unit as a monaural
amplifier through BTL.
CHANNEL 2: Turn this knob to control the channel 2
input level. When you set the OPERATION switch on
the rear panel to MONO, this knob does not function.
When you set the OPERATION switch on the rear panel to
SAME OUT, CHANNEL 1 and CHANNEL 2 are connected
(stacking connection). You can control the channel 1 input level
with the ATTENUATOR knob on the CHANNEL 1 side, and the
channel 2 input level with the ATTENUATOR knob on the
CHANNEL 2 side.
[6] Level meter
The 10-point LED level meter shows OdB at 8 ohms
load, 100 W output.
POWER switch and pilot lamp (green)
‘Press this switch to tum on the amplifier. The pilot lamp
lights when the unit is turned on.

CHANNEL 1
i (Monaural) )
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Ventilation hole
Two ventilation holes with a fan are located on both
sides of the front panel. The holes are covered with a
grill and a cover. When the grills become dusty, the fans
do not work properly and the HIGH TEMP indicator
starts to light frequently. In this case, remove the
ventilation hole cover and clean the grill. Unplug the AC
power cord before cleaning the grill.
Caution
Do not touch the interior of the unit when you remove the
grill.
To remove the ventilation hole cover
rill
Ventilation
hole cover
( CHANNEL 2 )
CHANNEL 2
Cup ATTENUATOR
-0-
a.
13 O- Ak HGH TEMP comme
1-0- ™% 5 °
oe aie, * * .
.*O+ 2 PROTECTION * .
PaOn un o |. .
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a-O- ° = *
neO- re :
CHANNEL 1 and CHANNEL 2 have the same function.
Notes
on
the
PROTECTION
lamp.
When does the PROTECTION lamp light?
The PROTECTION lamp lights when the protection
circuit functions to protect the speakers and the amplifier
by cutting off the output in the following cases:
¢ when DC (direct current) runs through the OUTPUT
’ connectors because of a malfunction of the amplifier.
¢ when the radiator located in the amplifier exceeds the
normal temperature (the HIGH TEMP indicator lights
continuously).
e when the impedance of the speaker is too lov, or when
the output is terminated.
In these cases, tum off the POWER switch, find the
cause and resolve the problem. Then turn onthe
POWER switch to operate the amplifier.
To put back the grill and the cover
1 Insert the grill into the slot. 2 Insert the cover into he slot.
§—— Put backhe Screws
and tight them.

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Rear Panel
[1] INPUT 1(MONO) connectors
and STACKING connector(CH1)
[2] INPUT 2 connectors
and STACKING connector(CH2)
[1]
INPUT(MONO)
(input
1,
hohe)
and
STACKING
connectors
Connect
outputs
of
a
mixer
or
preamplifier.
When
you
are
using
the
unit
as
a
stereo
amplifier,
these
input
connectors
are
for
CHANNEL
1.
When
you
set
the
OPERATION
switch
to
SAME
OUT
or
MONO,
these
connectors
accept
monaural
input
signals.
INPUT connector (XLR-3-31 type): Accepts balanced
input when you set the BAL/UNBAL switch to BAL.
When you set the switch to UNBAL, the connector
accepts unbalanced input (Number 2: HOT).
INPUT
jacks
(phono
type,
unbalanced):
Accept
unbalanced
signals
when
you
set
the
BAL/UNBAL
switch
to
UNBAL.
Use
one
jack
for
input,
another
to
connect
another
amplifier
for
stacking
connection.
STACKING
connector
(XLR-3-32
type):
Feeds
out
the
signal
which
is
received
from
the
XLR
type
INPUT
connector.
Use
this
connector
to
connect
another
amplifier
for
stacking
connection.
[2]
INPUT
(input
2)
and
STACKING
connectors
Connect
outputs
of
a
mixer
or
preamplifier.
When
you
are
using
the
unit
as
a
stereo
amplifier,
these
input
connectors
are
for
CHANNEL
2.
When
you
set
the
OPERATION
switch
to
SAME
OUT
or
MONO,
these
connectors
are
disconnected.
INPUT
connector
(XLR-3-31
type):
Accepts
balanced
input
when
you
set
the
BAL/YUNBAL
switch
to
BAL.
When
you
set
the
switch
to
UNBAL,
the
connector
accepts
unbalanced
input
(Number
2:
HOT).
INPUT jacks (phono type, unbalanced): Accept
unbalanced signals when you set the BAL/UNBAL
switch to UNBAL. Use one jack for input, another to
connect another amplifier for stacking connection.
STACKING connector (XLR-3-32 type): Feeds out the
signal which is received from the XLR type INPUT
connector. Use this connector to connect another
amplifier for stacking connection.
BAL/UNBAL SS a
INPUT 1 (MONO) AINPUT 2 connectors _
BAL XLR type connector
1:GND 1: GND
2: HOT 2:HOr
3: COLD 3: GND
Phono type jack
XLR-3-12C type XLR-3-11C type
Press here to detach.
Fit. Press here to detac.

[3] OPERATION switch
Changes the operation mode of the unit as follows.
OPERATION switch Operation mode
STEREO [Stereo
SAME OUT
signal.
BTL Monaural operation through
BTL.
Select the position of this switch when the POWER
switch is turned off.
Internal stacking operation
CHANNEL 2 has the same
signal as the CHANNEL 1 input
[4] OUTPUT terminals
Connect speakers. Connect the + speaker terminal to
the red terminal, — speaker terminal to the black
terminal.
When the unit is on monaural operation through BTL,
use only the red terminals. Connect the + speaker
terminal to the red terminal on the OUTPUT 1 side, —
speaker terminal to the red terminal on the OUTPUT 2
side.
[5]
[6]
[3] OPERATION switch
[4] OUTPUT terminals
15] BAL/UNBAL switch
'6] FUSE holder .
Ventilation hole
BAL/UNBAL (balanced/unbalanced) switch —
When you set the switch to BAL, the unit feeds in the
input signal from the source connected to the XLR type
INPUT connector.
When you set the switch to UNBAL, the unitfeeds in the
input signal from the source connected to the XLR type
INPUT connector* or to the phono type INPUT jacks.
You can make a stacking connection with another
amplifier since these input connectors are inparallel
connection.
*(n this case, the XLR type INPUT connector accepts
unbalanced input (Number 2: HOT).
FUSE holder
There is a fuse to prevent damage from excessive
current. Current capacity is 8A for the MU-A400 and 4A
for the MU-A200. When you replace the fuse, be sure to
use one with the same capacity.
~AC IN (inlet)
Connect the AC power cord supplied. The tnit operates
on 220-240V AC, 50/60 Hz.
By using the mounting parts on both sides, you can install
the unit in an EIA standard 19-inch rack.
If you install various pieces of equipment one upon another,
remove the unit’s bottom support. To remove, pull out the
screws of the supports, by using a screwdriver. -

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Connection Notes.
On power sources
To
avoid
damaging
the
unit
or
to
prevent
the
circuit
breaker
from
working
accidentally:
* Use an extension cord that can bear 10A current.
* Do not connect many pieces of equipment to the same AC
outlet.
| Using the Unit as a Stereo Amplifier”
OPERATION switch on
STEREO
Mixer, preamplifier, etc.
10
Impedance
more than 4 ohms
On connecting cables
¢ The power cord should be connected last. First make sure
that the POWER switch is turned off.
* The cable connectors should be fully inserted into the jacks.
A loose connection may cause hum and noise.
* Unplug the cord from the wall outiet by grasping the plug.
Never take out the plug by pulling on the cord. _
Speaker
Speaker
Impedance
more than 4 ohms