Nikko nr 819 rec sm

Page 1

NR-81 "

AM FM STEREO RECEIVER

UL and CSA type 120V AC

NK-STD type

DEMKO and SEMKO type 220/240V AC

DIN type

CONTENTS

SPECIFICATIONS................ .......
K , BLOCK DIAGRAM .....
.. CIRCUITDESCRIPTION....................
DISASSEMBLY.
ALIGNMENT ...... . .......
POWER TRANSISTORS MOUNTING ASSEMBLY
SCHEMATIC DIAGRAM
P..C BOARD .....
NOTICE .................. ...............
DIAL CORD INSTALLATION
1 PARTS LOCATION .....
PARTS LIST....... ....... .. ..... ......
SEMICONDUCTOR DATA,
TRANSISTORS............. ..... ........ ....... 26
FIELD EFFECT TRANSISTOR ..... 26
K DIODES, LEDS........
ZENER DIODES...........................
INTEGRATED CIRCUITS......................

...27~30

Page 2

i. NR-819 l

SPECIFICATIONS

(w, e & N-TYPE)
FM TUNER SECTION

Usable Sensitivity: ...... better than 10 dBu (3.16uV)
50 dB Ouieting Sensitivity: ,
........ better than 15 dBp (5.6 pV)
Signal to Noise Ratio: . . . . . . . . . . . . better than 65 dB
T. H. Distortion (1 KHz) Mono: ....... less than 0.3 %
, , , , , Stereo: , . . . less than 0.5%
Alternate Channel Selectivity: . better'thain 35 dB
Sprious Response Rejection: ....... better than 70 dB
Image Frequency Rejection: ....... better than 42 dB
IF Rejection: ................. better than 70 dB
AM Rejection: ................ better than 40 dB

AM TUNER SECTION

Usable Sensitivity: ...... better than 42 dBp (125.9 pV)
Signal to Noise Ratio: ............ better than 45 dB
Image Frequency Rejection (1000 KHz):
............. better than 30 dB
........ better than 30 dB

AUDIO AMPLIFIER SECTION

Continuous Power Output per channel, 8 ohms:
20 H2 N 20 KHZ . . . ....... more than 45 Watts

1 KHz .................. more than 45 Watts
T.H. Distortion, 8 ohms: ,

Continuous Power Ontput ....... less than 0.05 %

1 Watt Power Output .......... less than 0.05 %
I.M. Distortion, 8 ohms:

Continuous Power Output ....... less than 0.05 %

1 Watt Power Output ...... . less than 0.05 %
lHF Power Bandwidth, 8 ohms: ...... 20 Hz ~ 20 KHz
Damping Factor @ 1 KHz, 8 ohms: ............. 40

Frequency Response:
PHONO ->TAPE OUT (RIAA Equalization)
......... 30 Hz ~ 15 KHZ $1.5 dB
AUX, TAPE IN -> SP. TER.
......... 20 Hz ~ 20 KHz $1.5 dB
Input Sensitivity for 45 Watts Power Output:
PHONO ..................... 2.5 mV :2 dB
AUX, TAPE IN ............... 150 mV :2 dB
Phono Max. Input Capability, @ 1 KHz:
............. more than 120 mV

Capture Ratio: ................. better than 3 dB

Stereo Separation (100 Hz): ....... better than 30 dB
(1 KHz): ....... better than 35 dB
(10 KHz): ...... better than 30 dB
Subcarrier Suppression: .......... better than 40 dB
Muting Sensitivity: ............... 25 dBu i8 dB

Fll/l Frequeney Range: . . . . T . . . 87J9~108.5 MHz
Antenna Impedance:

...... 300 ohms balanced & 75 ohms unbalanced
Output Level: ................... 550 mV i2 dB

Selectivity (£10 KHz): ........... better than 30 dB
AM Frequency Range: ........... 530 ~ 1630 KHz
Output Level: .................. ' . 165 my :2 dB

Output Level, @ Continuous Power Output,
(Input: PHONO):

TAPE OUT .................. 150 mV i2 dB
Tone Control: I
BASS (70 Hz) Cut .......... --10 dB 4:3 dB
Boost ......... +10 dB :3 dB
TREBLE (10 KHZ) Cut .......... -.-10 dB i3 dB
Boost ......... +10 dB :3 dB
Loudness Control (VOLUME: ~30 dB):
70 Hz ........................ +9 dB i3 dB
10 KHz ....................... +5 dB :3 dB
Subsonic Filter, @ 20 Hz: ............. -3 dB 12 dB
High Filter, @ 10 KHz: .............. -3 dB :2 dB
Signal to Noise Ratio, lHF "A" Network:
PHONO .................. better than 80 dB
AUX, TAPE IN ........ . . better than 95 dB
Idling Current: ................. 20 mA 1'10 mA
Midpoint Voltage: .................. UV 150 mV