Sony STR-GX390 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-GX390 Specifications

General

Power output	55 watts per channel into 8Ω (stereo)
Frequency response	10Hz to 50kHz
Total harmonic distortion	0.08%
Input sensitivity	2.5mV (MM), 150mV (line)
Signal-to-Noise Ratio	76dB (MM), 100dB (line)
Dimensions	430 x 135 x 310mm
Weight	7.2kg
Speaker load impedance	8 ohms

Summary

Specifications

Amplifier Specifications

IC Pin Functionality

IC Pin Functions

Lists pin numbers, signal names, functions, and I/O for the main IC.

Electrical Adjustments

FM Discriminator Adjustment Procedure

Procedure to adjust the FM discriminator for zero voltage output.

FM Stereo Operation Level Adjustment

Procedure to set the FM stereo operation level for optimal stereo reception.

FM Stereo Separation Adjustment

Procedure to adjust FM stereo separation for improved audio quality.

Diagrams and Layouts

Circuit Board Layouts

Semiconductor Lead Diagrams

Provides pinout diagrams for various semiconductor components used in the device.

Main Section Schematics

Display Section Schematics

Tuner Section Schematics

Electrical Parts List

Capacitor Parts List

Lists various capacitor types, part numbers, and specifications.

Connector and Switch Parts List

Diode Parts List