Nikko ia 400 int sm

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INTEGRATED AMPLIFIER; 1

SERVICE MANUAL

CONTENTS

SAFETY INSTRUCTIONS
SPECIFICATIONS
BLOCK DIAGRAM ..
ALIGNMENT ......................
CIRCUITS DATA
PCB .........................
SCHEMATIC DIAGRAM
WIRING DIAGRAM
EXPLODED VIEWS
PARTS LIST ....................................

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SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

1. Parts identified by the A symbol pans are critical for
safety. Replace only with same parts number speCIfied.

2. Other pans and assemblies are specified to conform
with such regulations as those applying to spurious
radiation.

These must also be replaced only with specified re-
placements.

Examples: RF converters. tuner units, RF cables, noise
blocking capacitors, noise blocking filters,
etc.

3. Use specified internal wiring

a) Primary leads
b) Wires covered with PVC tubing
c) Double insulated wire

3 4. Use specified insulating materials for hazardous live
parts.

6) Insulation Tape

b) Insulated Barriers (Spacers)

0) PVC tubing

d) Plastic screws for fixing microswitch (Especially in
turntable)

e) Terminal strips

SPECIFICATIONS

Amplifier Section
Rated Power Output
Min. HMS power per channel into 8 ohms
from 20Hz to 20kHz at 0.01% T.H.D.. ,
both channels driven ............. 120W+120W (IA 600)
Min. RMS power per channel into 8 ohms
from 20Hz to 20kHz at 0.009% T.H.D..

both channels driven ............. ..... BDW+80W (IA 400)
Both Channels Driven
at 4 ohms, IkHz, (DIN) ........................ 210W+210W (IA 600)

130W+130W (IA 400)
Dynamic Power 00 ut

8 ohms . . 170w (IA 600)

. 120W (IA 400)

6 ohms 210W (IA 600)
150W (IA 400)
4 ohms .................................. 270W (IA 600)

180W (IA 400)
1.5dB (IA 600)
1.76 dB (IA 400)
10Hz to 60kHz
.. I40 (IA 600)

Dynamic Headroom

Power Bandwidth (T.H.D. 0.03%)
Damping Factor (8 ohms) .....

120 (IA 400)
Total Harmonic Distortion
PHONO to REC OUT 1kHz
MM I. 0003%
MC 0.003%

. 0.003% (IA 600)
. 0.003% (IA 400)

CD (IkHz at 1 CW)
(1kHz at 80W) I
Input Sensitivity/Impedance

PHONO MM 2.5mV/47kohms
MC . 0.25mV/1000hms
CD 140mV/47kohms

TUNER 140mV/47kohms

IA 500
III 400

5. When replacing the primary components (transformer,
power supply cord switch, by-pass capacitor, etc.),
wrap ends of wires securely about the terminals beiore
soldering.

Where hand soldering is involved, a minimum spacing
below between terminals of uninsulated live parts of
primary or supply circuitry through air or over surface
is to be maintained.

120V appliance : 3mm spacing min.
220V and 240V appliance : 6mm spacing min.

6. Observe that wires do not contact heat producing parts
(heatsinks, oxide metal resistance, rectifiers, etc.)

7. Check that replaced wires do not contact sharp edges
or pointed pans.

8. Do not leave electric conductive parts (screws, droplets.
etc.) Inside the appliance.

SAFETY RECHECK AFTER SERVICING

Confirm the specified insulation resistance between power
plug prongs and externally exposed pans of the appliance
is greater than 10Mohms, however, for equipment with
external antenna terminals (tuner, receiver. etc.) specified
insulation resistance should be more than 2.2Mohms
(ground terminals, in-output jacks etc.).

VIDEO
TAPE
Signal-to-Noise Ratio (lHF-A network)
PHONO MM (INPUT 5mV) .
MC (INPUT 0.5mV)

r 140mV/47kohms
. 140mV/47kohms

. 94dB
81 dB (IA 600)
80dB (M 400)
.......... 105dB
125dB (IA 600)

120115 (IA 400)

CD,TUNER. TAPE
MAIN IN

PHONO Overload level at 1kHz (0.1% T.H.D.)
MC ..........................................
Frequency Response
PHONO (FIIAA, REC 0UT150mV)
20Hz to 20kHz + OdB, -1.5dB
20Hz to 20kHz + OdB. -1.5d5

150mV
. 15mV

CD (at 1W) 5H1 to 100kHz + 0GB, -1.5dB
Tons Controls
BASS .. . £IDdB (IOOHZ)

TREBLE
SUESONIC FILTER

iiOdB (10kHz)
15Hz. 12dE/oct.

General
Power Require

U.S.Ar 8t Canada AC 120V, 60Hz

Europe AC220V. 50H:
Power Consumption

USA. 8. Canada ................................... 360W, 480VA (IA 600)

300W. AOOVA (IA 400)

Dimensions ........................ .. 442(W)x146(H)x413(D)n-Im

(17-2/5 x 5-3/4" x16-1/4")

Weight ............................................................... 14.5kg (32lbs)

' Specifications are subject to change without notice.