Mitsubishi DA-A10DC User manual

FRONT PA}IEL TERMNOLOGY AI{D FI]NCTIONS
A:
B:
es. 9-9=4(ohms)
8+8
Nominal impedance of speaker A
Nominal impedance of speaker B
1. THERMAL INDICATORS
lf the temperature of the heat sink reaches 60"C
(140'F), the thermal indicators change in color from
red to black. lf the indicators turn black, turn the
power off and allow time for the amplifier to cool.
Resume operation when the amplifier cools to nor-
mal temperature.
2. HEAT SINKS
The heat given off by the transistors is radiated into
the air by the heat sinks.
3. TRANSFORMERS
Please consult your audio dealer for additional
information.
4. OPERATIONS
BEFORE PLACING THE POWER SWITCH IN THE
ON OR OFF POSITION OR OPERATING
SWITCHES, ALWAYS TURN THE PREAMPLI.
FIER'S VOLUME (ATTENUATOB) CONTROL
ALL THE WAY DOWN
This is to protect the speakers from damage, that
can occur if the volume level is set high and the
power is turned on.
THERE WILL BE NO SOUND FOR A FEW SEC-
ONDS AFTER YOU TURN ON THE POWER.
THIS IS NOT A MALFUNCTON
This unit is equipped with a power supply muting
circuit which prevents popping noise when the pow-
er switch is turned on or off .
5. CARE
Wipe the cabinet with a soft cloth when it becomes
dusty. lf it should get really dirty, dampen a soft
cloth in a weak solution of mild soap and water,
wring it out dry and wipe off . When finished, dry
completely with a soft dry cloth. Any volatile ma-
terials such as alcohol, thinner, benzine, insecticides,
etc, may remove the paint or damage the luster and
should not be used.
UB71 BOO3HBE

PRECAUTIONS
1. GENERAL
BE SURE TO USE YOUR A.C. POWER SOURCE
Your A.C. power is marked on the rear panel of this
unit. Connection to any other power source may
cause damage to this unit and/or severe electrical
shock.
DO NOT PLUG IN OR UNPLUG THE POWER
CORD WITH WET HANDS
l-here is a great danger of severe electrical shock if
the power cord is plugged in or unplugged with wet
hands. Do not attempt to unplug the cord from an
A.C. outlet by pulling the cord. Firmly grasp the
plug to remove it f rom the A C. outlet.
DO NOT ALLOW WATER OR ANY FOREIGN
MATTER TO GET INSIDE THIS UNIT
Should water or a metallic object accidentally fall
into this unit, immediately disconnect the power
cord and consult your authorized service dealer.
HANDLE THE POWER CORD WITH CARE
Do not bend sharply or twist the power cord. lf the
insulation becomes damaged, the conductor breaks,
or poor contacts occur, request service from your
authorized service dealer. Continued use under these
conditions, may cause f ire or electrical shock.
DO NOT TOUCH THE INSIDE OF THIS UNIT
There are high voltages inside this unit. Never re-
move the top or bottom cover. All inspections and
repair including fuse replacement, should be carried
out by your authorized service dealer.
DISCONNECT THE POWER CORD AT THE
FIRST SIGN OF TROUBLE
At the f irst sign of unusual noise, odor, or malfunc-
tion, disconnect the power cord and consult your
authorized service dealer. Continued use under these
conditions, may increase damage or cause additional
problems.
2. LOCATION
AVOID PLACEMENT IN DIRECT SUNLIGHT.
NEAR AIR CONDITIONER ETC.
This unit can become unstable if operated in ex-
tremely high or low temperatures. Place it in a well
ventilated area for proper heat dissipation. Avoid
placement in direct sunlight, near air corditioners,
poorly ventilated areas or in areas of excess humidi-
ty or dust. Do not block the ventilation holes.
3. CONNECTIONS
BE SURE TO TURN OFF THE POWER BEFORE
MAKING CONNECTIONS
This is to prevent damage to the speakers from the
poppinq noise which occurs when plugging and
unplugging cords.
USE EXTREME CARE IN MAKING THE COR-
RECT CONNECTIONS
lf you reverse the R (right) and L (left) leads, you
will reverse the stereo location of R and L channels.
MAKE CONNECTIONS SECURE LY
lf any of the plugs should become loose or discon-
nected, a hum may develop. lf this is not corrected,
deterioration of sound quality and possible damage
to the speakers may result.
USE ONLY SHIELDED CORD FOR THE LEADS
Use only shielded cords for interconnecting com-
ponents. Do not use cords longer than 2m (6'). Ex
cessive lead lengths can deteriorate high frequency
response and are subject to interference that can
result in hum or noise.
DO NOT SHORT THE OUTPUT OF THE POWEB
AMPLIFIER
This unit incorporates a protection circuit so that
power transistors will be protected in case of a
short. Shorts can reduce the life of the translstors
and should be avoided.
USE SPEAKERS WITH NOMINAL IMPEDANCE
OF 4.16 OHMS
lf you use speakers with a load impedance of less
than 4 ohms, the protection circuit may be triggered
and the amplif ier output muted.
WHEN CONTROLLING TWO PAIRS OF SPEAK.
ERS SELECTION FROM THE COMPANION
PREAMPLIFIER, ENSURE THAT THE COM
BINED IMPEDANCE (BOTH PAIRS OF SPEAK
ERS OPERATING} IS 4 OHMS OR ABOVE
lf the combined impedance is below 4 ohms, the
load impedance detector circuit may operate and
rnute the power amplif ier output.
The combined impedance is determined with the
following formula.
coMB|NED TMPEDANCE = *+3 (oHMs)
u871 8003H88

REAR PAI{EL TERMNOLOGY AI{D CONNECTIONS
4. DUCTS
The power cord and connecting cords pass through
this ducts.
5. HANDLE MOUNTING SCREW HOLES
These holes are provided for mounting the handles.
For more detalls. see page 5 and 6.
6. ELECTROLYTIC CAPACITORS
7. POWER INDICATOR
This indicator illuminates when the POWER switch
is placed in the ON position.
8. POWER (Power Switch)
This switch is for turning this unit on and off . When
in the ON position, the power indicator is illumi-
nated.
INPUT LEVEL (lnput Level Controls)
The input level from the preamplif ier can be adjust-
ed by these screws. To increase the input level, turn
these screws clockwise. These screws are normally
turned fu I ly clockwise.
INPUT (Power Amplifier lnputs)
Connect the leads from the preamplifier's outputs
to these inputs.
SPEAKE RS (Speaker Terminals)
Two pairs of speakers may be connected to these
terminals. Turn the screws fully counterclockwise,
insert the speaker leads and tighten the screws
f irmly.
SPEAKER SELECTOR (Speaker Selection Switch)
This switch controls speaker selection. The speaker
systems can be selected from the preamplifier by
placinq this switch in the OFF position and connect-
ing the supplied SPEAKER CONTROL CABLE to
the preamplifier. For more details, see page 6.
REMOTE (Remote Terminal)
The connection for one end of the SPEAKER
CONTROL CABLE. The other end is plugged into
the "speaker control" terminal of a companion
preamplif ier . For more details, see page 6.
O CONNECTING THE SPEAKERS
When connecting the speaker leads to the SPEAK-
ERS terminals, there is danger of electrical shock or
f ire due to potentially high output voltages.
To avoid this danger, connect the speaker leads as
follows.
O Cut back the outer insulation of the lead to a
distance of 15 mm (5/8").
O Twist each inner conductor.
@ Turn the knob of the SPEAKERS terminal
f ul ly counterclockwise.
@ lnsert the Inner conductor into the hole of the
SPEAKERS terminal. Be sure that the end of
the insulation is inserted into the hole to a
d istance of 3 mm t1 18''t .
@ Fasten the speaker lead to the SPEAKERS
terminal by tightening the knob clockwise.
CAUTION: When using DA 41SDC, use more than
18AWG, SPT 2 cord with UL label for
speaker leads.
lnner Conductor Speaker terminal hole
UB71 BOO3HBB

HOW TO MOUNT THE HANDLES
Remove the screws and waShers that are fas-
tened to the right and left side of this unit.
Mount the supplied handles to both side of
this unit as shown in the diagram.
,E
F8." T
i6
OUTPUT
Ia Prea mplif ier
:.*H"il
" ao y_y
----' SPEAKE
. CONTRO
termina
A.C. POWER CORD
This cord is plugged
into the A.C. outlet.

OPERAHONS
-@
\EY
a
vv
HOW TO COMBINE THE POWER AMPLI.
FIER WITH THE PREAMPLIFIER OR
POWER LEVEL METER
This power amplifier may be combined (docked)
with either its companion preamplif ier for use as
an integrated amplifier or with its.companion
power level meter. The two units are combined
in the following way.
(D Remove the two screws and washers from
both the two units.
@ Unplug the power cord and place the POWER
switch in the ON position.
@ Place the two units together and mount the
handles to both side as shown in the diagram.
BEFORE OPERATING
Check the following items before placing the POW-
ER switch in the ON position.
o All other components are properly connected.
c The position of the SPEAKER SELECTOB
switch should correspond to the terminals to
which the speakers are connected.
r The INPUT LEVEL control screws should be
turned fully clockwise.
Then place the POWER switch in the ON position
1. OPERATION
Select the tuner, turntable or other source of pro-
gram material and advance the "Volume (Atten-
uator)" control on the preamplifier. You should
now be receiving the program from the speakers.
2. SPEAKER SELECTION FROM THE
COMPAN ION PREAMPLI FI ER
lf you are using the companion preamplifier, speak-
er selection can be controlled from the preamplif ier.
0 Place the SPEAKER SELECTOR switch to the
OFF position.
OConnect the SPEAKEB CONTBOL CABLE as
shown in the diagram (see page 5).
@ Speaker selection may now be controlled from
the preamplifier.
Q To avoid damage, mount the rubber pads sup-
plied on the handles as shown in the diagram.
u871 8003H88

BEFORE TAKING YOUR POWER A}4PLIFIER IN FOR SERVICING ....
4
First check to ensure that all other components are properly connected to this unit and are operating normally. Then check the following items.
SYMPTOM CAUSE REMEDY
oPower does not come on when the POWER
switch is turned on. o Power cord not completely plugged in
o Fuse has blown. o Plug in completely.
oConsult your authorized servlce dealer
oNo sound o lmproper SPEAKER SELECTOR switch positioning
o Nominal speaker impedance is less than 4 ohms and
protection circuit is operating.
oSpeaker leads or plugs not completely plugged in.
oSpeaker (+) and (-) leads are touching.
oCorrect the switch position.
o Use speakers with nominal impedance of 4 ohms
or above.
oPlug in completely.
oSeparate the leads.
o Noise oTurntable output cord too close to power cord.
o Plugs not completely plugged in.
o Put the turntable output cord as far as possible
from the power cord.
o Plug in completely.
o Howl ing oCaused by feedback. This occurs because speaker
vibrations are being transmitted to the turntable. o Place the speakers and the turntable as far apart
as possible. lt is also helpful to put an insulator
under the turntable.
oPoor sound quality oToo much power applied to speakers- oAdjust "Volume (Attenauator)" on your
preamplif ier.
o No stereo effect and poor bass oSpeaker leads or plugs (+) and (-) are reversed. oCorrect the speaker leads or plugs connection.
o No sound for 5 - 7 seconds after power is
switched on. o lVuting circuit is operating to eliminate the popping
noise when power is turned on. oThis is not a malfunction.
u87t 8003H88

DA.AIO DC / DA.AIs D C SPECIFICAT IONS
DA.AIODC DA.A1sDC
Por/€r oueut 'lOoW continuous pow€r per channe , both channe s drlven I50W conlinuous power per channel, both channels drlven
intoSohmsfroml5Hzto30kHr,withO.Ol%THD lnto I ohms'from lsHzto30kHz,wlth0.0l%THD
Totat hrrmonic disrofion 0.005% at sOW per channel, both channek driven lnto 8 0.005% at 75W per channel, both chann€ s drlven nto 8
ohms from 20H, ro 20kH hms from 20Hz 10 2okl-lz
lntsrmodulation dirtortion 0.008% at rated power,8 ohms 0.008% at rated power, S ohms
(70H2 and TkHz 4 : 1) 0.01% at lW per channel, S ohms 0.01% at ]W per channel, S ohms
Pow€r b.ndwidth l0llz to 100kHzat0.1%THD,Sohms loHzto 100kHzat0.1%THD,Sohms
{IHF)
Frequency r.sponie aO.ldBfrom20Hzto2OkHzalratedpow€r,8ohrns lO 1dB from 2OHz to 2OkHz a7 Gted power, S ohms
l l dB from DC to l5OkH? ar 0.5W per channel, S ohms i?dBfromDCtol50kHzat0.5Wperchannel,Sohms
lnput $nlitivity/impodanco I v (varlable )/50k oh ms 1 V (variable )/50k oh ms
oampins factor l00fronr20Hrto2okHz,8ohms 100from20H,to20kHz,8ohms
Chsnnel s€paration 100d8 at l kHz loodBatlkHz
80dB at 2OkNz 80dB at 20kHz
Hum lnd noiso 0.12mV (unweishted, closed circuit) 0.1&nV (unweighted, closed circuit)
Signal to nois€ ratio 107d8 {unw€ishted, c osed circuit) 107d8 (unweishted, clos€d circujt)
(at rated power) l22dB{HF,Anetwork,closedcircuit) 123d8 (lHF,A network,closed circuii)
I18dB (DtN. c osed ctrcuit) lgdB(DlN,closedcircuit)
109d8 (DlN,47k ohms//25opF rerminated) 109d8 (DlN,47k ohms//2sopF terminated)
slew rate 30v&s at 5oV peak to peak, 8 ohms 3ovfus at 50V peak to peak,8 ohms
Power comumpiion 600W (lEC nominal) 900W ( EC nominal)
3gow at rated power. S ohms 550W at rated power, S ohms
240W lU L nomina I 320W (Ulnominal)
Dimeniiort 425 x 170 x 285mm 425 x 11O x2A6nm
{WxHxDl 116.3/4 x 6.314 x 11 1/4'l 1163/4x631ax111/a")
woisht 16ks {35-1/4 b) 7-7ks (39 lb)
Supplled with: pin plug cord
speaker contro cab e
MELCO SALES, lNC. Desisn and specifications are subiect to chansewithout noticefor inrprovements.
3030 E6t V ictoria Srreer, Co mpto^, Calitorni. 90221 , U.S.A.
Tel.: [phone], Teler: O67327a
TollF@e:(a0o)421.1132loutideotcalifornial lB-1077-2 Printed inJapan
1r871 8003H88