The Sony SEN-280 is a stereo component system designed for comprehensive audio playback and recording. It comprises a turntable (PS-LX285), an integrated amplifier (TA-AX285), an AM/FM tuner (ST-JX285), and a double cassette deck (TC-W285). The system is designed for operation on 120 V AC, 60 Hz power.
Integrated Amplifier (TA-AX285)
The TA-AX285 serves as the central control unit for the system, managing audio input selection, amplification, and output to speakers and headphones.
- Function Description: The amplifier provides 100 watts per channel RMS power into 8-ohm loads, with a total harmonic distortion of no more than 0.08% from 20-20,000 Hz. It features multiple audio inputs for various components and outputs for two pairs of speakers (System A and System B), which can be selected individually or simultaneously.
- Important Technical Specifications:
- Power Output: 100 watts per channel (RMS, 8 ohms, 20-20,000 Hz, 0.08% THD).
- Inputs:
- PHONO: 2.0 mV sensitivity, 50 kilohms impedance.
- TUNER/CD/VIDEO/TAPE: 150 mV sensitivity, 50 kilohms impedance.
- Outputs:
- REC OUT: 150 mV voltage, 1 kohms impedance.
- SPEAKER: Accepts 8 to 16 ohms speakers.
- HEADPHONES: Accepts low and high impedance headphones.
- Frequency Response:
- PHONO: RIAA curve ±0.5 dB.
- TUNER/CD/VIDEO/TAPE: 7 Hz - 70 kHz ±3 dB.
- Graphic Equalizer Controls: Boost/cut range of ±8 dB for 100 Hz, 400 Hz, 1 kHz, 4 kHz, and ±6 dB for 12 kHz.
- Dimensions: Approximately 430 x 130 x 355 mm (17 x 5⅛ x 14 inches).
- Weight: Approximately 8.2 kg (18 lb 2 oz).
- Usage Features:
- Volume Adjustment: A rotary control for increasing or decreasing sound level.
- Muting Function: Temporarily silences the audio output.
- Sound Quality Adjustment: Graphic equalizer controls allow users to adjust frequency bands (bass, middle, treble) to personal preference, room acoustics, or program quality (e.g., reducing hiss).
- Balance Adjustment: Allows adjustment of left and right speaker output strength, useful for asymmetrical speaker placement.
- Speaker Selection: Buttons for selecting speaker system A, B, or both.
- AC Outlet: A switched AC outlet (100 W max) is provided to power other audio components, controlled by the amplifier's power switch.
- Maintenance Features: Cleaning the cabinet, panel, and controls with a soft cloth lightly moistened with a mild detergent solution.
AM/FM Tuner (ST-JX285)
The ST-JX285 is a quartz-locked digital synthesizer tuner for receiving FM stereo and AM broadcasts.
- Function Description: Provides clear reception of radio programs with automatic and manual tuning capabilities, as well as memory preset for up to 25 FM and AM stations.
- Important Technical Specifications:
- System: FM stereo, FM/AM superheterodyne tuner, Quartz-locked digital synthesizer system.
- FM Tuner Section:
- Tuning Range: 87.5-108 MHz.
- Antenna Terminals: 75 ohms unbalanced, 300 ohms balanced.
- Intermediate Frequency: 10.7 MHz.
- Sensitivity (at 50 dB quieting): 22.1 dBf, 7 µV (mono); 42.1 dBf, 70 µV (stereo).
- Usable Sensitivity: 19.5 dBf, 5 µV (IHF).
- Signal-to-Noise Ratio (at 75 kHz deviation): 80 dB (mono); 75 dB (stereo).
- Harmonic Distortion: 0.3% (mono); 0.5% (stereo) at 1 kHz.
- Separation: 40 dB at 1 kHz.
- Selectivity: 55 dB at 400 kHz.
- AM Tuner Section:
- Tuning Range: 530-1,610 kHz.
- Antenna: AM loop antenna, External antenna terminal.
- Intermediate Frequency: 450 kHz.
- Usable Sensitivity (AM loop antenna): 500 µV/m (1,000 kHz).
- Signal-to-Noise Ratio: 54 dB (50 mV/m).
- Harmonic Distortion: 0.3% (50 mV/m, 400 Hz).
- Selectivity: 38 dB (10 kHz).
- Dimensions: Approximately 430 x 80 x 250 mm (17 x 3⅛ x 9⅞ inches), including projecting parts and controls.
- Weight: Approximately 1.9 kg (4 lb 4 oz) net.
- Usage Features:
- Automatic Tuning: Scans and stops at receivable stations.
- Manual Tuning: Allows precise tuning to desired frequencies.
- Memory Preset: Stores up to 25 FM and AM stations for quick access.
- Memory Scan: Scans through memorized stations, skipping non-preset or weak signal stations.
- AM Tuning Interval Change: The AM tuning interval can be switched between 10 kHz (factory preset) and 9 kHz to match regional frequency allocation systems.
- Maintenance Features: Adjusting the antenna for optimal reception, connecting an external antenna for better signal strength, and ensuring proper ground wire connection.
Double Cassette Deck (TC-W285)
The TC-W285 is a 4-track, 2-channel stereo double cassette deck for playback and recording.
- Function Description: Enables playback of cassettes on either deck A or B, recording on deck B, and tape dubbing from deck A to deck B. It supports various tape types and Dolby NR.
- Important Technical Specifications:
- Recording System: 4-track 2-channel stereo.
- Frequency Response (DOLBY NR OFF):
- TYPE IV cassette (Sony METAL-ES): 30-15,000 Hz (±3 dB).
- TYPE II cassette (Sony UCX-S): 30-14,000 Hz (±3 dB).
- TYPE I cassette (Sony HF-S): 30-13,000 Hz (±3 dB).
- Wow and Flutter: 0.12% WRMS (NAB).
- Dimensions: Approximately 430 x 130 x 250 mm (17 x 5⅛ x 9⅞ inches), including projecting parts and controls.
- Weight: Approximately 2.85 kg (6 lb 6 oz) net.
- Usage Features:
- Tape Playback: Playback on either deck A or B. Only deck A is audible if both decks are in playback mode simultaneously.
- Tape Recording: Records on deck B with adjustable recording level and support for different tape types (Type I, Type II, Type IV).
- Dolby NR: Switchable Dolby Noise Reduction for improved sound quality during recording and playback.
- Tape Dubbing: High-speed or normal-speed dubbing from deck A to deck B.
- Maintenance Features:
- Cleaning Heads and Tape Path: Regular cleaning of heads, pinch roller, and capstan with cleaning fluid or alcohol every 10 hours of operation or before recording to maintain optimum record/playback quality.
- Demagnetizing Heads: Demagnetizing heads after 20 to 30 hours of use to remove residual magnetism.
Turntable (PS-LX285)
The PS-LX285 is a belt-drive turntable for playing records. (Note: The dust cover is not supplied in the U.S.A.)
- Function Description: Plays 33⅓ rpm and 45 rpm records with an automatic return and reject system.
- Important Technical Specifications:
- Platter: 30 cm (12 in.).
- Motor: DC servo motor.
- Drive System: Belt-drive.
- Speed: 33⅓ rpm, 45 rpm.
- Automatic System: Return, reject.
- Tonearm Type: Statically balanced.
- Cartridge Type: Moving magnet type.
- Stylus: Sony ND-155G (0.6 mil diamond).
- Dimensions (U.S.A. model): Approximately 430 x 95 x 350 mm (17 x 3¾ x 13¾ inches).
- Dimensions (Canadian model): Approximately 430 x 105 x 350 mm (17 x 4⅛ x 13¾ inches).
- Weight (U.S.A. model): Approximately 2.5 kg (5 lb 9 oz) net.
- Weight (Canadian model): Approximately 3.3 kg (7 lb 5 oz) net.
- Usage Features:
- Record Playback: Supports 17 cm records with a 45-rpm adaptor (supplied).
- Automatic Return: The tonearm automatically returns to the arm rest when the record finishes playing.
- Cueing Lever: Allows lifting the stylus during play.
- Reject Function: Stops playback and returns the tonearm to the arm rest.
- Maintenance Features:
- Stylus Replacement: The stylus (Sony ND-155G) should be replaced after approximately 400 hours of use.
- Troubleshooting: Addresses issues like impaired tone quality (dusty/worn stylus), no audio from one channel (loose phono cord), groove skipping (turntable not level, defective record), and rumble/howl (external vibration, proximity to speaker).
General System Features
- Remote Commander (RM-S380): Supplied with the system, it allows remote control of power, CD player operations (for optional CD player), tape deck pause (not functional with this system), and volume. It requires two AA (R6) batteries.
- Connections: The system emphasizes proper connection of power cords, speaker cords, and audio cables to prevent hum and noise. Color-coded plugs and jacks (red for right, white for left) are used for conventional audio connections.
- Safety Precautions: Advises operating on 120 V AC, 60 Hz, unplugging when not in use, avoiding obstruction of ventilation holes, and seeking professional service for liquid/solid spills or repairs.
- Installation Precautions: Recommends avoiding heat sources, direct sunlight, rain/moisture exposure, dust/dirt, and unventilated locations.
- Troubleshooting Guide: A comprehensive guide is provided to assist users in correcting common problems related to radio reception, cassette deck operation, turntable operation, and general audio issues.
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