Mitsubishi DA-A10DC User manual

AmrsuBrsHr
STEREO
POWER AMPLIFIER
DA.AIODT/N5DC
SERVICE MAN UAL
MELCO SALES, INC.

SERVICE DATA
DA-AlODC DA-A15DC
Power output l00w continuous power per 150w continuous power per
channel, both channels channel, both channels
driven into 8 ohms from driven into I ohms from
15 Hz to 30 krlz, with 0.018 15 Hz to 30 kHz, with 0.019
Total harmonic dis- 0.005% at 5OW per channel, 0.0054 at 75 per channel,
tortion both channels driven into both channels driven into
I ohms from 20 Hz lo 20 kHz I ohms from 20 Hz to 20 klHz
Intermodulation dis- 0.008? at rated power, 0.008? at rated power,
tortion 8 ohms I ohms
(70H2 and TkEz 4t]-l 0.018 at 1W per channel, 0.01% at 1tr{ per channel,
I ohms 8 ohms
Power bandwidth (IHF) lO Hz to IOO kHz at 0.18 10 Hz to 100 kHz at O,I%
THD, 8 ohms THD, I ohms
Frequency response !O.I dB from 20 llz to 10.1 dB from 20 Hz to
20 kIHz at rated power. 20 kl'z at rated poqrer,
8 ohms I ohms
l? dB from DC to 15O kHz at !! dB from DC to 15O kHz at
0.5W per channel, B ohms 0.5w per channel, 8 ohms
Input sensitivity/ Iv (varj-able)/50K ohms lv (variable)/50K ohms
impedance
Darping factor 1O0 from 20 Hz to 20 kllz, 100 from 20 Hz to 20 kHz,
I ohms 8 ohms
THDTHD
Channel separation 100 dB at I kHz
80 dB at 20 kHz 100 dB at I kHz 80 dB at 20 kHz
Hum and noise o.l2 mv (unweighted, closed 0,I5 mV (unweighted, closed
circuit) circuit)
Signal to noise ratio I07 dg (unweighted, closed 107 dB (unweighted, closed
(at rated power) circuit) circu.it)
122 dB (rHF, A network, 123 dB (rHE, A network,
closed circuit) closed circuit)
118 dB (DIN, closed circuit) 119 dB (DIN, closed circuit)
109 dB (DIN. 47x ohns/ / I09 dB (DIN, 47r' ollr.ts/ /
250pF terminated) 250pF terminated)
-2-

DA-AlODC DA-A15DC
slew rate 3ovlus at 5OV peak to peak, 3OvAs at 5Ov peak to peak,
I ohms I ohms
Power consumption 6OOW (IEC nominal) 9OOW (IEC nominal)
390W at rated porrrer, I ohns 550W at rated po{"re r, I ohns
24Ow (rJL nominal) 320!,I (Ur noninat)
Dimensions (WxHxD) 425 x L70 x 285 nm 425 x t70 x 285 mm
(L6-3/4 x 6-3/4 x rL-t/ ") (t6-3/4 x 6-3/4 x LL_L/4"1
weight 16 kg ( 35- I,/4 lb) 17.7 ks (39 Ib)
Supplied with: pin plug cord
speaher control cable
Design and specificatj-ons are subject to ctrange wi thout notice for improvements.
- 3-

v 0.05
o
..1
+J
tl
o
]J
tJl) 0 0r
rd
o 0 005
o
E
d
DA-AIODC CHARACTERISTIC TABLE
OUTPUT POWER \E RSUS HARMONIC
DISTORTIOIi CHAXACTERISTIC
(8 ohms, both channels driven)
FREQUENCY VERSUS HARMONIC
DISTORT]ON CHARASIERTSTIC
(8 ohms, both channels driven)
Frequencv (Hz )
FREQUENCY VERSUS SEPAFATION
CHARACTE RI ST I C
Frequency (Hz)
o
+J
tl
o
,IJ
6
o
..)
o
lr
d o*,
E0n
rd
idm
(6
or,o
c0 l
9,
q)
o'
Ca
o
Ol
a
o)
&
I510
Output (w)
FREQI]ENCY RESPONSE
ii
frl
it IT T'
Frequency (Hz)
Output (1w) I ohms Output
Rating -3dB (5Ow)
R-r1,
L-'R
#+.
- 4-

DA-A15DC CHARACTERISTIC TABLE
OUTPUT POWER VERS US I{ARI{ONIC
DISTORfION CHARACTERISTlC
(B ohms, both channels driven)
FREQI,ENCY RXSPONSE
FFNQUENCY VERSUS HARMONI C
DISTORTION CHAFACTE RISTI C
(8 ohms, both channels driven)
FRXQUENCY \,IERSUS SEPAR]LTION
ClIARACTERISTIC
Frequency (Hz)
I
.u
tr
o
.t-J
a
..1
d
U
9
!
l!
Fq
d
0)
t!)
o
91
a
CJ
&
o
..1
1.)
lr
o
.lJ
a
..1
d
o
o
lr
'!
TE
Output (1W) I ohms Output
Rating -3 dB ( 7s!{)
R-+L
L-}R
Frequency (Hz)
la
o
q
o
,lJ
rd
tl
id
Or
C)
U)
- 5-

DESCRIPTION AND FUNCTION OF EACII PART
I rront Panel of DA-A10DC (DA-AI5DC)
THE RMAL INDICATORS
If the temperature of the heat sink reaches
60'C (140'F), the thermal indicators change
in color from red to black. If the indica-
tors turn black, turn the power off and
allow time for the arnplifier to cool.
Resume operation when the amplifier cools to
normal temperature.
POWER (eower Switch)
This switch is for turning
this unit on and off. I'lhen
in the oN position, the
powe r indicator is i llum-i-
nated.
a Power oN I Po\.ver oFf
-6-

lBack Panel of DA-A]-0DC (DA-AlSDC)
SPEAKER SELECTOR (Speater selection Switch)
This switch contrcols speaker selection. The
speaker systens can be selected from the pre-
amplifier by placing this switch 1n the oFF
position and connecting the supplied SPEAKER
CONTROL CABLE to the preamplifier.
INPUT LEVEL (Input Leve1 Controls)
The input level from the preamplifier
can be adjusted by these screws. To
increase the input leve1, turn these
screws clockwise. These screws are
normally tumed fully clockwise.
REMOTE ( Remote terminal)
The connection for one end of the
SPEAKER CONTROL CABLE. The other end.
is plugged into the "speaker control"
terrrinal of a companion preanplifier.
-7-

1.
DISAS SEI{BLY
Disassembting the Bottom Cover
(Fis. r)
1) Remove the screws attached to the
bottom cover. (Refer to Fiq. I)
Note: since there
screws used.
Description
A: M4xB
B: M3x6
are two types of
of the screws
... 4 pieces screws
. .. 5 pieces screws
cover
Detail drawing
I
a
2. Taking out the Printed Circuit
tsoard (f rg. z,
1) Remove the screws of the bottom
plate,
2) Remove the scre\rs clamPing the
printed circuit board-
3) Cut the ctampers binding the lead
wire with a niPPer -
(Refer to Fig. 2-(1) )
4) Lift the printed circuit board in
the direction as shown in Fig. 2-
(2) .
5) Hold it into the gap of the rad.i a-
tor as shown bY the nurbered arrow
(3) of Fig. 2.
Removing the Electrolytic
Cap ac ito r
Remove the screws attached to the
printed circult board and set it
up ri gh t.
The capacitor cover can be removed
by removing the screws as shown
in Fig. 3.
M3x12: Self-tapping screws
3) The electrolytic caPacltor is
bonded to a holder.
It can be easilY taken off with a
slight force.
4) When the electrolytic capacitor is
fitted, be sure to bond it Proper-
Iy to the holder.
*As the electrolytic capacitor
cover has its fixed mounting
dj,rection, be careful about the
direction.
*The M3xI2 screws are used for
attaching the capacitor cove r '
But the M3xI6 screws should be
used when the holes of the M3x12
screws are biqger-
/ chassis
Holder
M3XI2
(setf-tapping screws) p1n.
1)
2l Cushion PL
Capacitor
cover
Electrolyti c
capacitor
- 8-

ADJUSTMENT (DA-A15DC can be adjusted in the same manner as in DA-A1oDC. )
. Adjustment of Idling Current
l) Set the speaker selector switch
to OFF posi tion.
2) Connect a DC anmete r between the
terminals (10) - (15) on the
printed circuit board (MA-25) of
DA-A1oDC or connect it between the
terminals (40) - (45) on the sane
circuit board (Me-25).
3) Rotate VR104 and VF204 and make
the DC voltmeter indication
rrinimum.
4) Adjust VR104 and vR204 and make
the DC voltmeter indication 1,0 mv.
5) At it takes time before a
steady state appears, readj ust
after approximately 10 minutes
so that the voltmeter indicates
5013 mV.
NON-S]O{AL CURRENT
- TEMPERATURE GIARACTERTSTIC
Adjustment of Neutral-Point
Potent i a1
l) Connect the DC volureter be-
tween the terminals (23) - (61)
on the printed circuj-t board.
of DA-AIoDC or connect it be-
tween the terminals 1531 - (61)
or the same printed circuit board.
2) Rotate VRL03 and VR203 and ad-
just them in the mechanical
center.
3) Make a rough adjustment of tJ:re
DC voltmeter indicati"on for
0i5 mV by means of the VRI02.
ltren make a fj-ne adjustment by
means of the vR103.
In the s ame manrter, make a fine
adjustnent of Rch by means of
vR202 after making its rough ad-
justment by means of VR203.
DA-AIODC PRINTED CIRCUIT BOARD ON
THE COPPER SIDE
Printed circuit board l4A- 25
.tl
C]
lr
tt
a
o
rd
b'
..1
o
I
o
Tolerance
DA-A}ODC
DA-A15DC
Ambient temperature ( "C)
Qvnron vR2o4 O
vRro2 C Q vneoz
vRro3o f- | O vR2o3
-9-

PRINTED CIRCUIE BOARD
a
- 10-

DA-AIODC SCHEMATIC DIAGRAM
E
z)
tr
Eru ffiffiffiffiffiTffi ffirtmm
9
9
lfrplification cilcuit tmffiffi
Hmffirffiffiffiffi mffiEm ffi
I
ffiilffiil ffi
EXTEII{AL \,AEW AND POI,ARITY DIAGFAII OE
254697 254639 258537 2SA9t6
2SAe47 2SAa23 2SD3a2 2SC l94 t
2SCtTae 2SAA32
?sct74a
2SKrO9 2SA90A
25Crsa5 sr {i sm-E
r__
W W ffiWffiffi
ffi
q HBil
s*
9 -tz a,
- 11 -

mmm
ffi r*Hrffi
i
I
J
trE
a1e A.92
frtr lro l
noir.ea d.se ni sprjlov 3m .e
yd 6erue6n eul6v edJ ei
.:5Ja3J v\Qros cq srlj
r!. .ia6d E ai !aji!.ai. eim
oJ Jost&e ai 6c mip6ib Ji@
{i ro} sijod Jlodjiw spcd.
.eJtremso:q
ror.elee :er6eqz <12 aqade I2 .I : etoti
-aoijizoq A-qe 6c dcjiwz
s 66 3 io JirU .S
gq lo.lryz-nod ... 5 (l)
sq Io.hya s
Q lo.Ij"yz-trod ... , (s)
Q, lod,,te )
Jius!i5 troi:lcaJorq
,"'3i?" ""'l'&.
8 gs{
i4l
ffil t;
lg
tll
ffiffi ffimm
-sr-

"'or r,r* mtrffi
zi6 v"" ,folf,on
tqi ^e
l5:
*3 ^
lmmmffiiffi
rummffiHffi
ffi Hr ffin ffi*il
E
l-ur P,r;l
I
__l
ffiffi
E;or."tt"*t.fd
xm rwr ffi
Note: 1. 51 sh@s Sp speaker selector
swiroh ed Sp-A position,
2. Unit of C dd R
(t) c... non-synbot !r
p syhbol pr
(2) R ... non-synrbol O
K synbol rc
l. The voltage in each section
is tne value heasured by
the Dc 2oKQlv rester.
ltis circuitry is a basic ci!-
cuit diagrd ed is subject to
ch ge sithout notice for in-
- 16-

DA-A1oDC, DA-AI5DC WrRtI{G
INPUT LEVEL
i_
oI5 0[6
oll7 0 8
o2t5 0216
o2t7 oaa
nay be dtff.€nt fee tnBe
24 SPEAKER B
I O OL
0209
rffi
- 13 -

22 REMOTE
24 SPEAKER
roo
POWER IND 52 POWER
PUSH ol.I
- )-4 -

qw r3K 2w )JS
ffi
o r05
EffiT
I nrr<
DA-A15DC SCHEI\IATIC DIAGRAIVI
l-'-
lffi ffiffiffirffi8Hffi Elq -I
;d
:9
EN
tr
zt
E
l@[gHffirffiffiHmt
ffiHffiN
2SAA50 2SAA47 25A639
2SCtTaB 2SAA23
25AAa2
zSCt?40
2S8537
i ffiffirffiffirEmffi ffin
I_ff
EXTEFNAI \.IEW 'ND POLARITY DIAGIIAJ,4 O!
KWWffiW trw
25A747 2S,Aa99
2SC| '6 2SCl904
EC8
-15-
mm

DA-AIODC PARTS LIST
PART NO. DESCRIPTION PART IDENTIFICATION
t--
t-.
Mo7L42303
Mo7142304
M05r04313
M0714 330 5
M0714 3306
M072I3303
M07140303
Mo12L3304
M07213305
M05r04312
1.,107142 3I0
MO7r13310
Mo7L423L2
MO7 229 309
MO7t32320
M0 7140 320
Mo7113 320
M04091331
M07060320
M0 7113 321
MO7t37 324
M07143320
MO1143327
M072r3360
M07113575
Mo72I3480
M0 7r13465
M0 7I43400
Mo7 t424t6
MO12r34L6
!10 50 85 47 3
Mo72t34L1
Mo7L42450
Mo7213450
Mo72I3210
Mo7L39779
rr0 714 39 r0
M0 714 3911
M07143930
M07304900
MO7304999
Transistor 2sCI585
" 2SA908
" 2ScL740
" 2SD382
" 2SB5 37
" 2SK109
n ,)c^an1
" 2SC1941
" 2SA916
Z5L\AZJ
Z 5AO J:'5
" 2SCI708
n 258616
Diode SEL105RC
" M2320
tt MZ3t2
" MV-13
L>Z+ I J
N L5247 L
" M2306
Electrolytic capacitor 65v, 10000UFX2
Terminal Board.
socket (Change of Speaker)
Rel ay
Volume BI00K
R-Iuse I/2w I5O-K
" 1/2W lK-K
n t/2w 22O-R
" 1/2w 3 30-K
SW-stide (Change of Speaker)
SW-Push (nower)
Ihob (Power)
Screw Metal
CUSH]ON MOLD
PACX(ING BAG
PACX(ING BOX
IB
Q7t7 , Q2L7
Q2L8
QLo2, Q2O2, Q3o2
Q1r3, Q213
Q1L4, Q2L4
Q10I, Q20I
Q103, Q104, Q2O3, Q2o4
Q105, Q106, Q2O5, Q2o6
9].L2, Q2t2
Q110, Q210
Q]].g , Q2L9
Q301
Q305, Q306
Q304
Dt8
D101, D20I
Dloz, D2o2
D103, D203
DLOA, D204 | D304, D305
DI3, D53, D105 , D106,
D2O5, D2O6, D3O2. D303
D301
DlI, D51
DL2, D52
c1l, c51
Relay A, Relay B
vRtol, vR201
R122, Rt23 | R222, R223
R133, R2 33
R116
R1I, R51
s1
Y
-17-

DA-AIsDC PARTS LTST
PART NO. DESCRIPT]ON PARf ]DENTIFICATION
Mo51043I3
M07143305
Mo7143306
M072r3303
M07140 303
M072I33o4
M072r3305
Mo5104312
M0 7142 3I0
M07rr3310
Mo7 L423L2
Mo7229309
M07143304
Mo7 2L430 3
Mo7 2L4304
M0 714 330 3
M07L32320
M07r40 320
M07113320
M0409r331
Mo7060320
M0 7113 32 1
Mo7L37324
M07143320
Ma7t4332l
M072 14360
M071r3575
M07213480
M07r13465
M07143400
Mo7t424t6
t'ro7143416
M0508547 3
Mo72L34t7
MO7 t42450
M07213450
Mo12132LO
Mo7139779
M07143910
M07143911
M071439 30
Mo7305900
Mo7304999
Transistor 2SCt7 40
2SD382
2SB5 37
2SK109
25aP.47
2SCL9 4L
" 25A916
" 2sA82 3
" 2 5A6 39S
" 2SCI708
" 2SA832
" 258616
" 2SA899
" 2SCLI16
" 2sA74L
" 2SCl904
Diode SELIo5RC
" w320
" t"E3L2
" MV- 13
'rc.',.1?2
" LS247t
" Mz3o6
" ss- 3
" ss- 3R
Electrolytic Capacitor 65V, l0000UFx2
Terminal Board
Socket ( change of speaker)
ReIay
Volume BI00K
R-Fuse I/2W I50-K
" l/2w L.2K-r'
" L/2w 22O-R
" 1/2w 330-K
SW-SIide (Change of Speaker)
SW-Push (nower)
Knob (Po\nrer)
Screw Metal
CUSHION }.'OLD
PAC(ING BAG
PACK]NG BOX
]B
Q102 , QI09, Q2o2, Q2O9,
Q3O2 ,
Qrr3, Q213
QLt4, Q2t4
Qror, Q20 r
Q103, Qro4, Q2o3, Q204
Qr05 , QI06, QI08, q205,
Q2O6, Q2Oe,
QtoT , Q2o7
Q110, Q2I0
QLte, Qzte
Q30r
Q303, Q30s, Q306
Q304
QLL2, Q2t2
Qrr5, QII7, Q2t5, Q2r7
Qr16, QII8, Q2L6, Qzta
QIlr, Q211
D18
Drol, D201
D]-o2, D2o2
D103, D2O3
Dto4, D2O4, D3O4, D305
DI3, D53, D105, D106,
D2O5, D2O6, D302, D303
D301
D1l, D51
D].2, D52
c1I, c51
Relay A, Relay B
vR1Ol, VR20l
R122, RL23, R222, R223
Rr33, R2 33
R116
R11, R51
- r8-

PACKAGE INSTRUCTION
for speaker leads
a string into the terminal hole
tighten it. )
Set the speaker selector switch to A position.
Note
(Put
and
rB (M07304999) ... A10DC,A15DC _
-=@
CUSHION
(M0 7143911) A1ODC,
A15DC
PACKING BAG
(M07143930) AIODC, A15DC
Main body
CUSEION MOLD
(M07143910) A10DC, A15DC
PACI(ING BOX
(Mo73o49Oo)
(M07 3059O0) AIODC
AI5DC
Stitching
@@
@o o@
- 19-

MELCO SALES, INC.
3030 East Victorla Street, Compton, Ca ifornia 90221, U.S.A.
Ie].: [phone],1etex: 067 3218
To I Free: (800) 421 I t32 (Outside of California) SM.8OO2.US PRINTED IN JAPAN