Inkel MA-410 User manual

yf, / PROFESSIONAL
-' MUSIC AMPLIFIER

Unpacking and Installation
Although it is neither complicated to install nor difficult to operate your stereo amplifier, a few minutes
of your time is required to read this manual for a properly wired installation and becoming familiar with
its many features and how to use them.
Please take a great care in unpacking your amplifier and do not discard the carton and other packing
materials. They may be needed when moving your set and are required if it ever becomes necessary to
return your set for service. Never place the unit near radiators, in front of heating vents, in excessively
humid or dusty location to avoid early damage and for your years of quality use. Connect your com-
plementary components as illustrated in the following page.
Features
e HIGH RELIABILITY |
To
assure
absolute
long-term
reliability,
the
output
section
of
each
channel
incorporates
Multiple
Emitter Power Transistor, which provide safety margin 4:1.
e HIGH POWER DRIVE
Triple
diffused
high
power
driver
transistors
are
employed
along
with
high
speed,
high
voltage
devices
for pre-driver and inverter stages.
e ENERGY LIMITERS
Voltage-current
type
energy
limiters
are
incorporated
for
overload
protection
of
the
amplifier.
Due
to
the
large
safe
operating
area
of
the
output
stage,
the
limiter
does
not
actuate
until
driving
1.4
ohm load at full power.
e THERMAL OVERLOAD PROTECTION
In MA-410 and MA-610, to protect the output stage from thermal overload, the output will be
automatically diconnected from the load (Loud speaker) by use of thermal switch when the heatsink
reaches to 95°C.
The load will automatically be reconnected when the temperature drops to below 95°C.
In MA-910, when the temperature of main heatsink reaches to 70°C, fan is activated. And the fan is
stopped when the temperature drops below 70°C.
e AC POWER PROTECTION
When a harmful DC voltage is detected at the output terminals, the protection relay cuts off the pri-
mary AC line. | |
e SURGE CURRENT PROTECTION |
These amplifiers are provided with output fuses to protect the loudspeakers from surge current.
¢ BRIDGED MONO FUNCTION
For more powerful sound, these amplifiers can be used for monoral sountl by selecting the meee selec-
tor to bridged mono function.
Please refer to BRIDGED MONO operation.

Rear Panel Connections
OUT R
AUDIO MIXER
MULTI AMP SYSTEM
ELECTRONIC CROSSOVER
SPEAKER L
ILE}
TT
A S74
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Front Panel and Rear Panel Controls
inKe —_ Ma-910
PROFESSIONAL
MUSIC AMPUFIER
1. POWER SWITCH
To
turn
the
Amplifier
ON
or
OFF,
press
the
upper
or
lower
of
this
switch
button.
2. POWER INDICATING LED
This LED indicates power is turned ON.
3. HANDLES
You can handle this amplifier easily by using these handles.
4. VU meter
The
large
VU
meters
are
provided
to
monitor
the
output
power
of
each
channel.
5. CLIP INDICATORS
Two
LED
indicators
illuminate
when
the
input
signal
levels
exceed
3dB
above
clipping.
Then
you
had better properly adjust the level controls.
6. LEVEL CONTROLS
Separate
level
controls
are
provided
for
channel
one
and
channel
two
input.
Clockwise
rotation
of
the controls increases level.

10.
11.
Bridged Mono Operation
. Set Mode Selector to MONO.
. INPUT CONNECTORS
These XLR jacks are for unbalanced input signal.
A
nominal
RMS
voltage
of
1.5
volts
will
drive
the
amplifier
to
rated
output,
and
the
input
impedance
are
nominally
15000
ohms.
|
. MODE SELECTOR
Bridged
mono
operation
is
easily
achieved
by
this
recessed
slide
switch.
The
input
is
applied
to
chan-
nel
one
only,
and
the
corresponding
front
panel
gain
control
is
used
to
set
the
level.
Please
note
Bridged
Mono
Operation.
. OUTPUT TERMINALS
Output
terminals
are
dual
five-way
binding
posts,
which
are
identified
as
to
polarity
with
a
red
anda
black
terminals.
We
suggest
the
use
of
dual
banana
plugs
as
a
convenient
and
reliable
method
of
hook-up.
Do
not
parallel
the
two
outputs
of
each
channel
by
connecting
them
(together,
or
parallel
them)
with
any
other
amplifier
output.
FUSE HOLDER
This
fuse
holder
contains
AC
primary
fuse.
When
fuse
is
blown
out,
it
should
be
replaced
with
the
same type just like following table.
If
it
continues
to
blow,
stop
replacing
fuse
and
refer
servicing
to
qualified
personnel.
AC 100V/120V AC 220/240V
* Output fuses are built in the sets.
AC POWER CORD
Plug this AC input cord into AC outlet.
Connect a mono input signal to channel one input jack.
3.
Connect
the
speaker
load
to
the
two
red
terminals
of
each
channels.
Please
confirm
the
(+)
terminal
of speaker to channel one and the (—) terminal to channel two.
. Do not use the black terminals of each channel.
5. Please notice to connect the speaker impedance 8 ohm or above.
. And adjust the channel one volume not to illuminate the clip LEDs of front panel.

Specifications
MA-410 MA-610 MA-910
260W 560W 700W
at 8 ohms, 1KHz (Stereo per CH) 100W 175W 300W
at4 ohms, 1KHz 150W 280W 400W
i
Dimensions — 483(W)x133(H)x385(D)mm 483(W)x177(H)
x385(D)mm
Weight (Net) 18 Kg 19 Ke 27 Ke
AC100V/120V/220V/240V, 50Hz/60Hz
Rated Output Power
at 8 ohms, 1KHz (Bridged Mono)

MODEL MA-910
VOLUME
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3:
RED,
BLACK
7
4:
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2) AT 220V
1: YELLOW
2: ORANGE
3: BLACK
4: REO
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CHANNEL TWO
INPUT 1,6V@gtien 0. 775V)
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15000/20V
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CLIP FROM CH2
CHANNEL TWO
OUTPUT
FROM
CH2
('7)
pac
pes
100V
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(SAME
AS
CHANNEL
ONE
)
(6)
FOR
.
KS
VERSION
INPUT
TO
CH2
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PROTECTION
RELAY
(8)
7
STEREO
(13)
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(12)
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POWER BD. (40051 17400)
AC INPUT
I20V, 50 /60rHz
FOR UL,CSA VERSION
—~
SERVICE
INFORMATION
——
CR-
SISK
1. RESISTANCE VALUES ARE INDICATED IN OHMS UNLESS OTHERWISE SPECIFIED. (K =1,000, M=100,000)
2. CAPACTIANCE VALUES ARE SHOWN IN MICROFARADS UNLESS OTHERWISE NOTED .
(i MICRO~ MICROFARADS ) ,
3.
ALL
VOLTAGES
ARE
REFERED
TO
GROUND
UNDER
THE
FOLLOWING
CONDITIONS.
@505
:
TRIAC
TC25C
60
EX ROPE VERSION
BL =
B= |
prt . ES tes See
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= AC INPUT
220V / 502
=
FCR
GENERAL
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|
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|
Laas
ac: RNS Q101 -QIO3S , O40! , 0402 , O5N1-Q504, OGO! * KTC 2240BL
4 ——— PRECAUTION -—— Q104,Q110 : KTCIOISY
A) ALL COMPONENTS manne A\ must oe. REPLACED ONLY WITH ORIGINAL TYPE SPECIRED BY QtOS, Q1l2: 2NS418
THE MANUFACTURER , DONG WON PA SOUND AND INSTALLED AS THE ORIGINAL WITH Q107, 9108 : 2N3440
SPACERS AND POSITIONED AWAY FROM ADJACET COMPONENTS WHERE APPLICABLE . Q1I09 °: KTCISISY
@)
ALL
SOLDERING
MUST
BE
DONE
IN
A
PROFESSIONAL
MANNER
USING
SOLOER
WITH
Qit!l,
Q113—-O123
©
280424
RESIN CORE OMLY. QI25 ,Ok26 > KTAS7OBL
C)
ALL
COVES
,
SHIELO
AND
INSULATING
SPACERS
MUST
SE
REPLACED
BEFORE
RETURNING
Q106
:
28C
34235
APPLIANCE TO CUSTOMER . DIO! - DIOS, Dilt, Dil4 * COGae
D) A DAMAGED POWER SUPPLY CORD MUST BE REPLACED BEFORE RETURNING APPLIANCE D109, DII0, DITS : IN4004
TO
CUSTONER
.
DEO!
,
DOO!
:
PB252
eee
:
£)
A
DIELECTRIC
TEST
CONSISTING
OF
ISOOVAC
6OHZ
IS
TO
BE
APPUFIEED
BETWEEN
BOTH
Ec.
a4
BLADES
OF
THE
POWER
SUPPLY
CORD
ATTACHMENT
PLUG
AND
THE
EXPOSE
CONDUCTIVE
28C
3423
a
vasdees
KTC i8iSyY
SURMACE
OF
THE
APPLIANCE
FOR
A
PERIOD
OF
NOT
LESS
THAN
ONE
SECOND
BEFORE
Mae
tak
cey
thine
RETURNING TO APPLIANCE TO CUSTOMER .
F)
THE
-BAV-E-
MARKED
RESISTORS
ARE
MOUNTING
ABOVE
THE
P.C.B
ON
SLEEVES.
sala
9007009420

MODEL MA-410
ae ®)
CHANNEL OME
INPUT 1.5V (Option | 0.778 V)
CHANING. TWO
(PUT 1.5V (Option | 0.775 V)
ee
re
—— SERVICE MPORMATION—
VOLUME BO 4005117500
MA-610
|. RESISTANCE VALUES ARE INDICATED IN OHMS UNLESS OTHERWISE. (K«1,000, M=!,000,000)
2. CAPACITANCE VALUES ARE SHOWN IN MICROFADADS UNLESS OTHERWISE NOTED. (Me MICRO— MICROPARADS)
3. ALL VOLTAGE ARE REFERED TO GROUND UNDER THE FOLLOWING CONDITIONS.
ac - RMS
4. —PRECAUTION——
A) ALL COMPONENTS marxen /A\ ust GE REPLACED ONLY WITH ORIGINAL TYPE SPECIFIED BY THE
MANUFAC TURER , DONG WON PA SOUND AND INSTALLED AS THE ORIGINAL WITH SPAGERS AND
POSITIONED AWAY FROM ADJACENT COMPONENTS WHERE APPLICABLE.
B) ALL SOLDERING MUST BE DONE IN A PROFESSIONAL MANNER USING SOLDER WITH RESIN CORE ONLY.
C) ALL COVERS, SHIELD AND INSULATING SPACERS MUST BE REPLACED BEFORE RETURNING APPLIANCE
TO CUSTOMER
0) A OAMAGED POWER SUPPLY CORD MUST BE REPLACED APPLIANCE TO CUSTOMER.
E) A DIELECTRIC TEST COSISTING OF ISOOV AC GOH:z IS TO BE APPLIED BETWEEN BOTH BLADES OF THE
POWER SUPPLY CORD ATTACHMENT PLUG AND THE EXPOSE CONDUCTIVE SURFACE OF THE APPLIANCE
POR A PERIOD OF NOT LESS THAN ONE SECOND BEFORE RETURNING TOAPPLIANCE TO CUSTOMER.
F) THE -P-WWVW-E MARKED RESISTORS ARE MOUNTING ABOVE THE P.C.B ON SLEEVES.
—NOTE——
Q101 — 9108
Q401 — ove | KTC 22408
QS80l — 9504
Q104, QIOS - KTA 9708.
Q1I0G , QUZ KT IOISY
Qt KTCI@IBY
QIO7, G10 =: 2N5 418
2108, Q118 :2N34a0
QUuS, QU .KTC2238Y
Q108 : 2803423
Que -QIa : 290424
DIOI- D108 7) |
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DNO,O1! =: 1N4004
poo! : PB 282
MAIN BD 4005117700
fur FROM CH2
|
|
—eE cs
2SC 8423
TOS. Su/M3 (MA- 610)
TSOSARIuL = (MA- 410)
THERMAL SWITCH
\ | CHANNEL ONE
LEVEL METER
CHANNEL ONE
OUTPUT FUSE
RISO
Cie
| OUTPUT CHANNEL ONE
OUTPUT
BRIDGED MONO
] OUTPUT CHANNEL TWO
A A) AT (00v
VoL SELECTOR 1: YELLOW , ORANGE
P-T 2 | WON CONNECTION
CHANNEL TWO (2828096000 MA-410) H>— 3: RED, MACK
LEVEL METER (2828000800 mA-@o =F 4: NON CONNECTION
; O O O
B) AT 220V
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0.43/2W
DOG
¢
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q
a
Z
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CHANNEL TWO
(SAME AS CHANNEL ONE )
P-T e-T
(2828096010 MA- 410) (2826096010 MA- 410)
(28280986@t0 MA- 610) (2828085010 MA-6!10)
POWER BD 4005i/!17400
YE
AC INPUT
220V/S0HZ
For GENERAL
6 EUROPE Version
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est. | | QI20, 9121, RIZ2, RIZE > MA- GIO ONLY
2n 5415
2N
3440
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Se
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«126
KTC
183
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KTC 2236 94015 KTA 11S
TRIAC KTA 970 BL
KTC 2240 BL