Nikko alpha 220 pwr sm

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TYPE AND VOLTAGE

W-TYPE: UL and CSA type IZOV AC

E -TYPE: NK-STD type 220v AC

SIIIIIIIIIIIIII

CONTENTS
SPECIFICATIONS..... ............................................................ .. 1
BLOCK DIAGRAM ............................................ . .................. 2
DISASSEMBLY ...... . .................................. , ....................... 3
CIRCUIT DESCRIPTION .................................................. 4~e
PARTS LOCATION ................................................................. 7
SCHEMATIC DIAGRAM ..................................................... 8,9
P.C.BOARD.... ...................... ........ 1011
ALIGNMENT ................................................................... 12,13
POWER TRANSISTORS MOUNTING ASSEMBLY .. .. . 14
PARTS LIST ................................................................... 15,16
SEMICONDUCTOR DATA,

TRANSISTORS ......... ..... .. ...............................................

FIELD EFFECT TRANSISTOR ......... . . . . .

DIODES, LED'S
ZENER DIODES
INTEGRATED CIRCUITS

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{0111220 W
SPECIFICATIONS

AMPLIFIER SECTION

\ Continuous Power Output per Channel:

20 ~ 20000 Hz (8 ohms) ..... more than 120 Watts
20 ~ 20000 Hz (4 ohms) ..... more than 130 Watts
1000 Hz (8 ohms) .......... more than 120 Watts
1000 Hz (4 ohms) .......... more than 130 Watts

' T. H. Distortion, 8 ohms:
at Continuous Power Output . no more than 0.008%

at 1 Watt Power Output ....... no more than 0.02%

T. H. Distortion, 4 ohms:

at Continuous Power Output . . no more than 0.02%

I. M. Distortion, 8 ohms:

at Continuous Power Output . . no more than 0.01%

at 1 Watt Power Output ....... no more than 0.02%
IHF Power Bandwidth, 8 ohms: ........ 5 ~ 70000Hz

Damping Factor at 1000 Hz, 8 ohms: . more than 60

GENERAL

Power Requirement:

WTYPE .................. AC 120V, SOHZ
E-TYPE ................... AC 220V, 50Hz
B-TYPE ................... AC 240V, SOHZ
Power Consumption: .............. 480 W (620 VA)

Ambient Temperature during Operation: . . . -IO~ 30°C

.*Specifications are subject to change without notice.

Frequency Response, "NORMAL" input, 8 ohms:
at 1 Watt power Output . . .10 ~100000Hz +0, -IdB

Input Sensitivity for 120 Watts Power Output:
MAIN IN ....................... 1V i 2dB

Signal to Noise Ratio, IHF "A" Network:
MAIN (NORMAL, DIRECT) .... better than 105dB

Signal to Noise Ratio, DIN Filter:
MAIN IN (NORMAL, DIRECT) .. better than 90:18

Channel Balance: ............... no more than 1clB

Residual Hum and Noise, 8 ohms: , . no more than 0.5mV

Idling Current: .................... 40~120mA
Midpoint Voltage: ................... O i 20mV
Muting Delay Time: ................ 3 ~ 7 seconds

Dimensions:

Width ................ 482 mm (19 inches)
Height ............... 138 mm (51/3inche5I
Depth ................ 344 mm (13 1/2 inches)
Weight, without package: ......... 13.5 kg (29.7 lbs)