The Sony CFS-1140 is a portable radio cassette-corder designed for audio playback and recording, featuring a MEGA BASS system for enhanced low-frequency sound.
Function Description:
The CFS-1140 serves as a multi-functional audio device, combining an AM/FM radio tuner with a cassette player and recorder. It allows users to listen to radio broadcasts, play pre-recorded cassettes, and record audio onto cassettes from various sources, including the radio, an external microphone, or other stereo equipment connected via the CD/LINE IN jacks. The unit supports microphone mixing, enabling users to sing or speak over music from the radio, CD/LINE IN, or tape. Its portable design, with the option for battery operation, makes it suitable for use in various locations.
Important Technical Specifications:
- Power Output and Total Harmonic Distortion: Rated at 4.5 watts per channel minimum RMS power with 6 ohm loads, both channels driven, from 80-10,000 Hz, with no more than 10% total harmonic distortion in AC operation.
- Frequency Range:
- FM: 87.6-108 MHz
- AM: 530-1,710 kHz
- Antennas:
- FM: Telescopic antenna
- AM: Built-in ferrite bar
- Frequency Response (Tape): 100-10,000 Hz
- Speakers: Two-way system with a 2 cm (¾ in.) diameter tweeter and a 10 cm (4 in.) diameter woofer. Impedance: 6 ohms.
- Inputs:
- Mixing microphone (MIX MIC) input jack (minijack) (1): Sensitivity 3 mV for low impedance microphone.
- CD/LINE IN jacks (stereo phono) (2): Input impedance 47 kilohms, Sensitivity 0.24 V.
- Outputs:
- Headphones jack (stereo minijack) for 16-66 ohms impedance headphones.
- Speaker terminals for supplied 6 ohms impedance speakers.
- Power Requirements: 120 V AC, 60 Hz or 9 V DC (six size D (R20) batteries).
- Power Consumption: 15 W in AC operation.
- Battery Life (approximate):
- Sony SUM-1 (NS) batteries: FM 8 hours, Tape recording 2 hours, Tape playback 8 hours.
- Sony AM-1 alkaline batteries: FM 18 hours, Tape recording 6 hours, Tape playback 18 hours.
- Dimensions (w/h/d): Approx. 650 x 195 x 190 mm (25⅝ x 7¾ x 7½ inches), including projecting parts and controls, not including handle.
- Weight: Approx. 5.8 kg (12 lb 13 oz) including batteries.
- Accessory Supplied: AC power cord (1).
- Accessories Not Supplied: Sony "MDR" headphone series, Head demagnetizer HE-5C.
Usage Features:
- Cassette Playback:
- Simple operation: Set FUNCTION to TAPE, insert a cassette, and press PLAY.
- Directional playback: The DIR switch allows changing the tape transport direction (FWD/REV) and the FWD/REV indicator shows the current direction.
- Playback modes: Select between playing both sides of a cassette once or playing one side continuously using the DIR MODE selector.
- Fast winding: Rapidly wind forward or backward using the respective buttons.
- Pause function: Temporarily stop playback/recording.
- Auto Shut-off: The unit automatically releases the depressed buttons when the tape reaches its end.
- Recording:
- Supports TYPE I (normal) cassettes only.
- Automatic recording level: Volume and graphic equalizer adjustments do not affect recording level.
- Recording from radio: Select the desired band, tune in a station, insert a cassette, set DIR MODE, check tape transport direction, and press REC.
- Recording from MIX MIC: Insert a microphone into the MIX MIC jack.
- Recording from other stereo equipment: Connect external equipment to the CD/LINE IN jacks.
- Microphone Mixing: Mix microphone sound with audio from CD/LINE IN, radio, or tape.
- Radio Tuning:
- Select desired band (FM, AM).
- Tune in a station using the tuning knob.
- FM STEREO indicator lights up for strong FM stereo programs; if weak, reception becomes monaural, and the indicator goes out.
- Antenna adjustment: Extend the telescopic antenna for FM and adjust its angle; the AM antenna is built-in.
- Sound Adjustment:
- VOLUME: Controls overall loudness.
- MEGA BASS: Boosts or reduces bass frequencies for a heavy and powerful sound.
- GRAPHIC EQUALIZER: Five sliders (400 Hz, 1 kHz, 4 kHz, 10 kHz) allow equalization of reproduced sound.
- 400 Hz: Adjusts middle frequency range (human voice, instrumental music).
- 1 kHz: Provides more presence for vocals.
- 4 kHz: Adjusts sound brightness.
- 10 kHz: Affects general treble (lower to reduce high-frequency noise/tape hiss).
- BALANCE: Adjusts stereo imaging, especially when speakers are not symmetrically placed.
- Power Sources: Operates on AC power (using the supplied cord) or DC power (six size D batteries). The unit cannot be operated on batteries when the AC power cord is connected.
- Speaker Connection: Detachable speakers can be aligned and slid onto the main unit or detached. Speaker cords connect to R and L terminals, with black wires to negative (-) and red wires to positive (+).
Maintenance Features:
- Troubleshooting Guide: Provides solutions for common issues such as the unit not operating, cassette insertion problems, recording difficulties, tape movement issues, and no sound from speakers.
- Head Cleaning: Instructions to clean illustrated portions of the heads with a cleaning tip moistened with cleaning fluid or alcohol to address sound drop-outs, loss of high frequencies, or excessive noise.
- Head Demagnetization: Recommendation to demagnetize heads and all metal parts in the tape path with a commercially available head demagnetizer to prevent sound quality issues.
- Battery Replacement Indicator: The OPR/BATT (operation/battery) indicator glows faintly when batteries need replacement.
- Cassette Care:
- Recommendation to use cassettes shorter than 90 minutes for long continuous recording or playback.
- Instructions to break off tabs on cassettes to prevent accidental erasure of recordings.
- Instructions to cover slots with plastic tape to reuse cassettes that have had their tabs removed.
- Unit Handling Precautions: Avoid exposure to extreme temperatures, direct sunlight, water, dust, or mechanical shock. If anything falls into the unit, unplug it and have it checked by qualified personnel.
- Pre-use Recommendation: If the unit has not been used for a long time, set it in playback mode for several minutes before inserting a cassette.
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