Nikko gamma 40 tun sch

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GAMMA4U

STEREO FM TUNER

W-TYPE: UL and CSA type 120V AC

_' E -TYPE: NKvSTD type 220V AC

B ~TYPE: BS type 240V AC

CONTENTS
SPECIFICATIONS ................................................................... 1
BLOCK DIAGRAM .................................................................. 2
DISASSEMBLY ..................................................................... 3
ALIGNMENT ................ 4~7
DIAL CORD INSTALLATION ........................................................ 8
PARTS LOCATION ................................................................. 9
SCHEMATIC DIAGRAM ......................................................... 10,11
P. C. BOARD .................................................................. 12,13
PARTS LIST .................................................................. 14~ 17
SEMICONDUCTOR DATA
TRANSISTORS ............................................................... 18
FIELD EFFECT TRANSISTOR ................................................... 18
DIODES, LEDS ............................................................... 18
ZENER DIODES .............................................................. 18

INTEGRATED CIRCUITS .................................................... 19 N 22

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é GAMMA 4U

SPECIFICATIONS

ITEM IF BAND WIDE" 1F BAND NARROW"
Usable Sensitivity: ................... better than 12 dBu ........................ better than 12 dBp
(4 AV) (4 uV)
50 dB Ouieting Sensitivity: ............. better than 15 dB): ........................ better than 15 dB);
(5.62 uV) (5.62 uV)
Signal to Noise Ratio,
MONO: ...................... better than 75 dB ........................ better than 75 dB
STEREO: ..................... better than 65 dB ........................ better than 65 dB
T. H. Distortion,
MONO: ..................... no more than 0.1% ....................... no more than 0.3%
STEREO: .................... no more than 0.2% ....................... no more than 0.5%
Capture Ratio: ............... . better than 4dB ......... I ............ better than 4dB
Alternate Channel Selectivity: ........... better than 30 dB ........................ better than 65 dB
Spurious Response Rejection: ........... better than 80 dB ........................ better than 80 dB
image Frequency Rejection: ...... better than 80 dB ........................ better than 80dB
IF Rejection: ...................... better than 80 dB ......................... better than 80 dB
AM Rejection: ..................... better than 50 dB ........................ better than 50 dB
Stereo Separation, i
(100 Hz): ..................... better than 35 dB ........................ better than 35 dB
(1 kHz): ...................... better than 40 dB ........................ better than 35 dB
(10 kHz): ..................... better than 35 dB . . .' ..................... better than 35 dB
(HilBlend ON, at 1kHz): ................ 21 1,6dB .............................. 21 i 6dB
Subcarrier Suppression: ............... better than 55 dB ........................ better than 55 dB
Muting Sensitivity: ...................... 20 dB); 1 6dB ........................... 20 dBu i 6dB
Output Level (Fixed): .. . . . . . , . . . . . . . . 1,000mV i 2dB ......................... 1,000mV i 2dB
Tuning Frequency Range: 87.4 N 109 MHZ . . . . 87.4 N 109MHz
Antenna Impedance: ..................................... 300 ohms balanced and 75 ohms unbalanced
General

Power Requirement,
U. S. A. & Canada model: .................................................. AC 120 V 60 HZ

European model: ...................................................... AC 220 V 50 Hz
England model: ......................................................... AC 240 V 50 Hz
Power Consumption: .............................................................. 20 Watts
Dimensions, . '
(Width): ........................................................... 480 mm, 19 inches
(Height): ......................................... , .................. 70 mm, 2 3/4 inches
(Depth): ........................................................... 330 mm, 13 inches
Weight, without package ........................................................ 6 kg, 13.2 lbs

* Specifications are subject to change without notice.