Nikko NR 1219 Service Manual

Page 1

NR-IZIQ

AM/FM STEREO RECEIVER

: TYPE ANDiVOLTAGE

W-TYPE UL and CSA type 120V AC
E-TYPE NK-STD type

I N-TYPE DEMKO and SEMKO type 220/240V AC

\ . JSERVICEMANUAL

CONTENTS
SPECIFICATIONS ................................................................. 1, 2
BLOCK DIAGRAM .................................................................. 3
CIRCUIT DESCRIPTION .......................................................... 4 ~ 8
DISASSEMBLY .................................................................. 9,10
ALIGNMENT .................................................................. 11 ~ 15
P. C. BOARD ................................................................. 16~ 19
POWER TRANSISTORS MOUNTING ASSEMBLY ........................................ 20
DIAL CORD INSTALLATION ........................................................ 21
PARTS LOCATION ................................................................. 22
PARTS LIST .................... ' f ............................................. 23 ~ 28
SEMICONDUCTOR DATA,
TRANSISTORS ................................................................ 29
FIELD EFFECT TRANSISTOR ..................................................... 29
DIODES, LEDS ............................................................... 29
ZENER DIODES ............................................................... 29

INTEGRATED CIRCUITS ..................................................... 30 ~ 33

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II Nil-1219

SPECIFICATIONS

FM TUNER SECTION (W, E & N-TYPE)

Usable Sensitivity: . . . better than 10 dBp (3.16 pV)
50 dB Ouieting Sensitivity:
.......... better than 15 dBu (5.6 MV)

Signal to Noise Ratio

(MONO): ................ better than 65 dB

(STEREO): ............... better than 60 dB
T. H. Distortion at 1 kHz

(MONO): . ............. no more than 0.3 %

(STEREO): .............. no more than 0.8 %
Alternate Channel Selectivity: ....... better than 60 dB
Spurious Rejection Ratio: ......... better than 80 dB
Image Frequency Rejection Ratio: . . . . better than 80 dB
IF Rejection Ratio: .............. better than 80 dB
AM Suppression Ratio: ........... better than 50 018

AM TUNER SECTION

Usable Sensitivity, Ferrite Loopstick Antenna:
............ better than 1000 pLV/m

Signal to Noise Ratio: ............ better than 38 dB

Image Frequency Rejection Ratio: . . . . better than 30 dB

AUDIO AMPLIFIER SECTION

Continuous Power Output per channel
20 ~ 20000 Hz (8 ohms): . more than 100 Watts
1000 Hz (8 ohms): ........ more than 100 Watts
1000 Hz (4 ohms): ........ more than 110 Watts
T. H. Distortion, 8 ohms
at Continuous Power Output:
............ no more than 0.03 %
at 1 Watt Power Output: . . . . no more than 0.05%
I. M. Distortion, 8 ohms
at Continuous Power Output:
.......... no more than 0.03 %

at 1 Watt Power Output: . . . . no more than 0.05 %
IHF Power Bandwidth, 8 ohms: ....... 20 ~ 30000 Hz
Damping Factor, at 1090 Hz, 8 ohms: ........... 50

Frequency Response
PHONO -> TAPE OUT (RIAA Equalization):
........... 30 ~ 15000 Hz 10.5 dB
AUX, TAPE IN -> SPEAKER TERMINAL:
............ 1o ~40000 Hz :2 dB
Input Sensitivity for 100 Watts Power Output

PHONO ................... 2.5 mV 1'2 dB
AUX, TAPE IN .............. 150 mV :2 dB
MAIN IN ................. 1000mV :2 dB

PHONO Maximum Input Capability, at 1000 Hz:
............ more than 200 mV

Capture Ratio: .................. better than 4 dB
Stereo Separation

(100 Hz): ................ better than 30 dB

(1 kHz): ................. better than 35 dB

(10 kHz): ................ better than 30 dB
Subcarrier Supression Ratio: ........ better than 58 dB
Muting Sensitivity: ................. 30 (13;; i 8 dB
T- LOCKED System

(Lock Range): ............ 150 kHz i 100 kHz

(Lock in Range): ............ 50 kHz i 20 kHz
FM Tuning Range: .............. 87.9 ~ 108.5 MHZ

Antenna Impedance
..... 300 ohms balanced & 75 ohms unbalanced

Output Level: ................... 550 mV 1 2 dB
IF Rejection Ratio: .............. better than 25 dB
Selectivity (1 10 kHz): ............ better than 30 dB
AM Tuning Range: ............... 530' 1630 kHz
Output Level: ................... 120 mV 13 dB

Output Level at Continuous Power Output,

(input: PHONO) TAPE OUT: ........ 150 mV i 2 dB
PRE OUT: ........ 1000 thZdB
Tone Control
BASS (70 Hz) Boost: .......... +10 dB i 2 dB
Cut: ........... -10 dB 1 2 dB
M|D(1000 Hz) Boost: ........... +6dBi2dB
Cut: ............ #6 dB i 2 dB
TREBLE (10000 Hz) Boost: ...... +10 dB :2 dB
Cut: ....... -10dBi2dB
Loudness Control (Volume control set at -30 dB position)
70Hz: .................... +10dB12dB
10000 Hz: ................... +6dB :2 dB
Subsonic Filter, at 20 HZ: ............ #3 dB i 2 dB
High Filter, at 10000 Hz: ............. -3 dB 12 dB
Signal to Noise Ratio, IHF A" Network
PHONO: ................. better than 82 dB
AUX, TAPE IN: ............ better than 90 (13
Audio Muting: ................... -20 dB i 2 dB
Output Muting Delay Time: ........... 6 Sec. 1 3 Sec.

Residual Hum and Noise, Bohms:

............ no more than 1.5 mV
Idling Current: .................. 40 mA i 20 mA
Midpoint Voltage: ................. 0 V i 100 mV