Pioneer SX 50 Service Manual

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AM/FM STEREO RECEIVER

SX-EO m

MODEL SX-50 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS:

ORDER NO.
ARP - 294 - 0

Type Voltage Remarks
KU AC120V only US.A. model

KC ACI20V only Canada model

8 AC110V, 120V, 220V, 240V (swltchablel General export model
SIG ACI 10V, 120V, 220V, 240V (switchable) U,S. MlIllary model

0 This service manual is applicable to the KU type.
For servicing of the other types, please refer to the additional service manual.
0 For the circuit description, please refer to the SX-60, SX-50, SX-40 service manual (ARP-3930).
0 Ce manuel d'instruction se refére au mode de réglage, en frangais.
0 Este manual de servicio trata del método de ajuste escrito en espafiol.

CONTENTS

1. SPECIFICATIONS ....................... 2 7. ELECTRICAL PARTS LIST ..............
2 FRONT PANEL FACILITIES ................ 3 8. PACKING ...........................
3, PARTS LOCATION ..................... 5 9. ADJUSTMENT .......................
4. EXPLODED VIEW AND PARTS LIST rrrrrrrrrr 7 REGLAGE ..........................
5. PO BOARDS CONNECTION DIAGRAM ...... 11 AJUSTE ............................
6 SCHEMATIC DIAGRAM .................. 15 10. SAFETY INFORMATION ................

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PIONEER ELECTRONIC CORPORATION 471. Megw:7 1 Cmrwe Meguvflrku roxyo 153 Japan
PIONEER ELECTRONICS [USA] INC. 1925 E Dommguez 5:. Long Beam. Ca farms 9081a u s A

PIONEER ELECTRONIC [EUROPE] N.V. Kaecberglaan 1 2740 Enema Eegum

DIDNEER ELECTRONICS AUSTRALIA PTV. LTD. 178484 Boufldary Road, Bieewde v aura 3195 Australia

FX ©JUNE I983 Primed in Japan

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1 . SPECIFICATIONS

Power Amplifier Section

Continuous Average Power Output is 50
watts* per channel, min., at 8 ohms from
20 Hertz to 20,000 Hertz with no more
than 0.007% total harmonic distortion.M

Intermodulation Distortion (50 Hertz : 7,000 Hertz = 4:1,
8 ohms, from POWER iN)
continuous rated power output: No more than 0.007%

Pre Amplifier Section
input (Sensitivity/Impedance)
PHONO MM .............. 2.5mV/50 kilohms
CD/AUX, VIDEO, TAPE PLAY. . . 150mV/50 kilohms
Phono Overload LeveIiT.H.D. 0.1%. 1.000 Hertz)..REC out
PHONO MM ..................... 130mV
Output (Level/Impedance)
TAPE REC 1, 2, ADAPTOR OUT. . 150mV/2.2 kilohms
Frequency Response
PHONO (RIAA Equalization)
................. ZDHZ to 20,000 Hertz t 0.3d8
CD/AUX, VIDEO, TAPE PLAY
................... 5H2 to 1004000 Hertz:gdB

Tone Control
BASS .................... . tSdB ilOOHz)
TREBLE .................... iSdB (10kHZI
Subsonic Filter .................. 20H2 (GdB/oct.)

Loudness Contour (Volume control set at -40dB position)
............................ +6dB (100Hz)
Hum and Noise (IHF, short-circuited, A network)
PHONO MM ....................... 80dB
CD/AUX, VIDEO, TAPE PLAY ............ QSdB

FM Tuner Section
Usable Sensitivity . .Mono;10.8dBf,lHF(0.95uV, 750hms)
50dB Quieting Sensitivity
............ Mono; 17.3dBf, IHF lZpV, 75 ohms)
Stereo; 37.5dBf, lHF (20uV, 75 ohms)
Signal-toNoise Ratio ......... Mono; 79dB (at GOdBf)
Stereo; 75118 (at 80d Bf)

Distortion
MONO 100H2 ..................... 0.1%
1kHz ...................... 0.1%
6kHz ..................... 0.25%
STEREO 100Hz ..................... 0.2%
1kHz ..................... 0.15%
6kHZ ...................... 0.4%
Capture Ratio ......................... 1.0dB
Alternate Channel Selectivity ......... 400kHz; 65dB
Stereo Separation ................... 1kHz; 45dB
30Hz to 15kHz; 35dB
Frequency Response .......... 20Hz to 15kHz:(15 dB
Spurious Response Ratio ................... 70dB
Image Response Ratio ..................... 50dB
Auto Tuning Threshold ....... 29.3dBi (8)1V, 75 ohms)

Antenna Input . . 3000hrns balanced, 75 ohms unbalanced
AM Tuner Section

Sensitivity (IHF, Loop antenna) ........... 220uV/m
(IHF, Ext. antenna) .............. 10pV
Selectivity ............................. 60dB
Signal-to-Noise Ratio ...................... 50dB
Antenna .............. High sensitivity loop antenna
Miscellaneous
Power Requirements ............... AC 120V, 60Hz
Power Consumption ..................... 240W
Dimensions .......... 420(W) x 120(H) x 311(0) mm
16»9/16(W) x 4A3/4IH) x 12-1/4lD) in
Weight (without package) ......... 7.2kg (15 lb 14 oz)
Furnished Parts
FM TAtype Antenna ........................ I
AM Loop Antenna ......................... 1
Operating Instructions ....................... 1

" Measured pursuant to the Federal Trade Commissions Trade
Regulation rule on Power Output Claims for Amplifier.
" " Measured by Audio Spectrum Analyzer.

NOTE:
Specification: and the design sub/act to possible modifications
without notice due to improvements.