Sony STR-GX290 Service Manual

STR-GX290/6X390
SERVICE MANUAL
AEP Model
Photo : STR-GX290
SPECIFICATIONS
Amplifier section
Continuous RMS power output
STR-GX390 : 50W +50W(8 ohms: AEP/4 ohms: Germany, at 40Hz—
20kHz less then 0.7% total harmonic distortion)
STR-GX290 : 30W + 30W(8 ohms: AEP/4 ohms: Germany, at 40Hz—
20kHz less then 0.7% total hamonic distortion)
Dynamic power (DIN) .
STR-GX390 : SOW +50W (8 ohms: AEP/4 ohms: Germany, at 1KHz
0.7%)
STR-GX290 : 30W+30W(8 ohms: AEP/4 ohms :Germany, at 1KHz
0.7%)
Dynamic power (IEC)
STR-GX390 : 50W +50W(8 ohms: AEP/4 ohms : Germany, at 1KHz
0.7%)
STR-GX290 : 30W + 30W(8 ohms: AEP/4 ohms: Germany, at 1KHz
0.7% )
Harmonic distortion
less then 0.7% at rated output
Frequency response
PHONO: RIAA equalization curve £0.5dB
CD
VIDEO | 10Hz—S50kHz *? dB
TAPE
Inputs
ane
Sensitivity Inpedance
S/N (Weighting network)
input level) |
74 dB
72 dB* (A, 2.5 mV)
CD, VIDEO 95 dB
TAPE 1, 2 eon 50 kohms | 80 dB* (A, 200 mv)
“78 IHF
Outputs
—
REC OUT Voltage :200 mV
VIDEO (AUDIO) OUT | Impedance 10 kohms
SPEAKER A, B Impedance 8 ohms : AEP/4 ohms : Germany—-16 ohms
HEADPHONES Accepts low and high impedance headphones
colts
Tone controls
BASS: £10dB at 100Hz
TREBLE : £10dB at 10kHz
Variable loudness contro!
+6dB at 100Hz (MAX)
FM STEREO/FM-AM RECEIVER
SONY.

Sony STR-GX290 Specifications

General

Tuning range	FM: 87.5 - 108 MHz, AM: 530 - 1710 kHz
Power output	55 watts per channel into 8Ω (stereo)
Number of Channels	2
Total harmonic distortion	0.08%
Input sensitivity	2.5mV (MM), 200mV (line)
Speaker load impedance	8 ohms
Dimensions	430 x 150 x 320 mm
Weight	6.5 kg
Signal-to-Noise Ratio	76dB (MM), 82dB (line)

Summary

Specifications

Amplifier Section Specifications

Describes power output, distortion, and frequency response for the amplifier.

Input/Output Specifications

Details sensitivity, impedance, and S/N ratio for input and output terminals.

IC Pin Functionality

Microcomputer IC Pin Functions

Details the signal name, function, and I/O for microcontroller pins.

Microcomputer IC Pin Functions (Continued)

Electrical Adjustments

FM Discriminator Adjustment

Describes the procedure and settings for FM discriminator adjustment.

FM Stereo Separation Adjustment

Outlines the procedure for adjusting FM stereo separation.

FM Stereo Operation Level Adjustment

Details the procedure for adjusting FM stereo operation level.

Diagrams and Layouts

Printed Wiring Boards - Main Section

Printed Wiring Boards - Main Section (Continued)

Schematic Diagram - Display Section

Presents the circuit schematic for the display section, including IC block diagrams.

Schematic Diagram - Tuner Section

Provides the circuit schematic for the tuner section, including IC block diagrams.

Electrical Parts Lists

Tuner Board Components