The Sony CFS-W435S is a portable radio cassette-corder designed for audio playback and recording, featuring a twin-cassette mechanism and a 4-band graphic equalizer. This model is available in E (East European), Saudi Arabia, and United Arab Emirates versions, with slight variations in frequency ranges and power requirements.
Function Description:
The CFS-W435S serves as a versatile audio system, combining a radio tuner and a dual cassette deck.
- Radio Tuner: It includes FM, MW (Medium Wave), SW1 (Shortwave 1), and SW2 (Shortwave 2) bands. The FM frequency range is 87.6-107 MHz for the East European and Saudi Arabia models, and 87.6-108 MHz for the E and United Arab Emirates models. MW ranges from 530-1,605 kHz (Saudi Arabia, E, UAE) or 531-1,602 kHz (East European). Both SW1 and SW2 cover 2.3-7 MHz and 7-22 MHz, respectively, across all models. The radio features a telescopic antenna for FM/SW reception and a built-in ferrite bar antenna for MW. A fine tuning knob allows for precise station selection.
- Dual Cassette Deck: The device incorporates two cassette holders (Deck A and Deck B), enabling playback and recording. It supports a 4-track, 2-channel stereo recording system. The dual deck allows for tape-to-tape dubbing at both normal and high speeds.
- Graphic Equalizer: A 4-band graphic equalizer provides control over audio frequencies, allowing users to customize the sound output.
- Bass Boost: A dedicated Bass Boost control enhances low-frequency response.
- Connectivity: The unit includes a headphones jack (stereo minijack) for private listening, compatible with headphones of 8-300 ohm impedance. It also has speaker terminals for connecting external speakers and a microphone input.
- Power Options: The CFS-W435S can be powered by AC (220-230 V AC, 50 Hz for East European models; 110-120/220-240 V AC, 50/60 Hz selectable for other models) or by 9 V DC using six R20 (size D) batteries.
Important Technical Specifications:
- Maximum Power Output: 5 W (2.5 W + 2.5 W).
- Frequency Response (Tape): 80-8,000 Hz.
- Speakers: Two-way system with two 10 cm diameter woofers and two 2 cm diameter tweeters.
- Power Consumption (AC operation): 14 W.
- Battery Life (FM recording): Approximately 8.5 hours with Sony SUM-1 (NS) batteries, and approximately 24 hours with Sony AM1 (N) alkaline batteries.
- Dimensions (W/H/D): Approximately 680 × 216 × 188 mm, including projecting parts and controls, but not including the handle.
- Mass: Approximately 5.8 kg, including batteries.
- Accessories Supplied: Mains lead (1).
Usage Features:
- Controls: The device features clearly labeled controls for function selection, band selection, tuning, volume, and graphic equalizer adjustments. Tape operation buttons for both decks (A and B) allow for play, fast forward, rewind, stop/eject, and pause.
- Indicators: An OPR/BATT indicator provides status feedback for operation and battery level.
- Voltage Selector: For models other than East European, a voltage selector on the rear allows switching between 110-120V and 220-240V AC.
Maintenance Features:
The service manual outlines detailed procedures for maintenance and adjustment:
- Mechanical Adjustments:
- Cleaning: Regular cleaning of the record/playback head, erase head, capstan, pinch roller, rubber belts, and idlers with a denatured-alcohol-moistened swab is recommended.
- Demagnetization: The record/playback head should be demagnetized with a head demagnetizer, taking care not to bring it close to the erase head.
- Torque Measurement: Procedures are provided for measuring playback torque (30-70 g.cm), back tension (1.5-5.5 g.cm), rewind torque (more than 80 g.cm for Deck A, more than 55 g.cm for Deck B), and fast forward torque (more than 80 g.cm for Deck A, more than 55 g.cm for Deck B) using specific torque meters (CQ-102C, CQ-201B).
- Tape Tension Measurement: Instructions for measuring tape tension (more than 100 g) using a CQ-403A tension meter.
- Electrical Adjustments:
- Tape Section Adjustments:
- Standard Input/Output Levels: Specifications for MIC IN (300 Ω, 3.085 mV) and PHONES/SP OUT (32 Ω/3.2 Ω, 0.25 V/0.775 V) are provided.
- Test Tapes: Specific test tapes (WS-48B for tape speed, P-4-A063 for azimuth speed) are used for adjustments.
- Record/Playback Head Azimuth Adjustment: A detailed procedure using a test tape (P-4-A063) and VTVM connected to the PHONES jack is outlined to adjust the azimuth screw for optimal phase.
- Tape Speed Adjustment: Instructions for adjusting RV303 on the audio board to achieve a tape speed of 2,970 to 3,000 Hz (±3%) using a speed checker or digital frequency counter.
- Tuner Section Adjustments:
- FM/AM RF SSG: Procedures for adjusting FM and AM sections using an RF SSG (Signal Standard Generator) and VTVM.
- FM IF Adjustment: Adjusting T7 for maximum reading on VTVM at 10.7 MHz.
- FM Frequency Coverage Adjustment: Adjusting L2 and TC2 for specific frequencies (86.5 MHz and 109.5 MHz).
- FM Tracking Adjustment: Adjusting L1 and TC1 for specific frequencies (86.5 MHz and 109.5 MHz).
- AM IF Adjustment: Adjusting T6 for maximum reading on VTVM at 455 kHz.
- MW Frequency Coverage Adjustment: Adjusting T5 and TC4 for specific frequencies (520 kHz and 1680 kHz).
- MW Tracking Adjustment: Adjusting ANT1 and TC3 for specific frequencies (620 kHz and 1400 kHz).
- SW1/SW2 Frequency Coverage and Tracking Adjustments: Procedures for adjusting T3, CT1, T1, T4, CT2, and T2 for specific shortwave frequencies.
- VCO Adjustment: Connecting a frequency counter to IC1 pins and adjusting RV1 for 76 kHz ± 500 Hz at 98 MHz.
- Safety-Related Components: The manual highlights components critical to safe operation with specific markings, emphasizing that these should only be replaced with genuine Sony parts.
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