The Sony CFM-D1 is a portable radio cassette-corder designed for both audio playback and recording, featuring a dual-speaker system for enhanced sound. This device is an E Model, indicating its specific regional configuration.

Function Description:

The CFM-D1 serves as a versatile audio device, combining a radio receiver with a cassette player and recorder. It supports both AC power (selectable between 110-120V and 220-240V, 50/60Hz) and DC power (6V, using four R20/size D batteries), making it suitable for both home and portable use. The cassette section allows for playback and recording of audio, with a 2-track, mono recording system. The radio section offers multi-band reception, including FM, MW, SW1, and SW2, catering to a wide range of broadcast frequencies.

Important Technical Specifications:

Frequency Range:
- FM: 87.6-107MHz (Saudi Arabia model), 87.6-108MHz (EXCEPT Saudi Arabia model)
- MW: 530-1,605kHz
- SW1: 2.3-7MHz
- SW2: 7-22MHz
Aerials:
- FM/SW: Telescopic aerial
- MW: Built-in ferrite aerial
Recording System: 2-track, mono
Frequency Response: 50-12,000Hz
Speakers: Two 7.7 cm (3 1/8 inches) diameter woofers.
Maximum Power Output: 2W
Output: Earphone jack (minijack) for 32 ohms impedance earphone.
Power Requirements:
- AC: 110-120V, 220-240V AC selectable, 50/60Hz
- DC: 6V, four R20 (size D) batteries
Power Consumption: 6W (AC operation)
Battery Life (approximate):
- FM recording: 20 hours (Sony R20P), 48 hours (Sony LR20 alkaline)
- Tape Playback: 18 hours (Sony R20P), 30 hours (Sony LR20 alkaline)
Dimensions (W/H/D): Approx. 330 x 147 x 120 mm (13 x 5 7/8 x 4 3/4 inches), including projecting parts.
Mass: Approx. 2.2kg (4lb 9 oz), including batteries.
Accessory Supplied: Mains lead (1).

Usage Features:

The CFM-D1 is designed for user-friendly operation with clearly labeled controls.

Tape Operation Buttons: Standard controls for PAUSE, STOP/EJECT, FF (fast-forward), REW (rewind), PLAY (playback), and REC (record) are available.
Volume Control: A dedicated knob allows for easy adjustment of audio output.
Tone Control: Provides customization of the audio tone.
OPR/BATT Indicator: A visual indicator for operation status and battery level.
Function Selector: Allows switching between Radio and TAPE (with a Radio off option).
Band Selector: Enables selection of FM, SW1, SW2, or MW radio bands.
Tuning Control: A main tuning knob for radio frequency selection.
Fine Tuning Control: Offers precise adjustment for optimal radio reception.
Built-in MIC: An integrated microphone for recording audio directly onto cassette tapes.
Earphone Jack: For private listening.
Dual Speaker System: Enhances audio output quality.
One-Touch Recording: Simplifies the recording process.
Auto Shut-Off: A feature for the cassette mechanism to prevent tape damage.

Maintenance Features:

The service manual outlines specific maintenance procedures to ensure the device's longevity and optimal performance.

Cleaning: Regular cleaning of critical parts such as the record/playback head, pinch roller, erase head, capstan, rubber belts, and idlers with a denatured-alcohol-moistened swab is recommended.
Demagnetization: The record/playback head should be demagnetized using a head demagnetizer, taking care not to bring it close to the erase head.
Torque Measurement: Procedures for measuring playback, rewind, fast forward, and back tension torque are provided, along with specified ranges, to ensure proper tape transport mechanism function.
Tape Speed Adjustment: Detailed steps for adjusting tape speed using a test tape (3kHz, 0dB) and a speed checker or digital frequency counter are included, aiming for a frequency range of 2,970-3,030 Hz and a frequency difference within 0.35%.
Record/Playback Head Azimuth Adjustment: Instructions for adjusting the azimuth of the record/playback head using a test tape (6.3kHz, -10dB) and a VTVM or distortion meter to achieve maximum output levels.
Electrical Adjustments: Comprehensive guidelines for radio section adjustments, including FM IF alignment, FM frequency coverage adjustment, AM (MW/SW) IF alignment, MW/SW1/SW2 frequency coverage adjustment, and tracking adjustments for FM, MW, SW1, and SW2. These adjustments involve using signal generators, VTVMs, and distortion meters to optimize reception and performance.
Safety-Related Components: The manual highlights critical components identified by specific marks (▲ or dotted line with ▲) on schematic diagrams and in the parts list. These components are crucial for safe operation and must be replaced with genuine Sony parts whose part numbers are specified in the manual or supplements.
Exploded Views and Parts List: Detailed exploded views of the front cabinet, rear cabinet, and mechanism deck sections, along with an electrical parts list, are provided to facilitate repair and replacement of components. These lists include part numbers, descriptions, and remarks, aiding in accurate servicing.
Standardization Notes: Information regarding standardized parts (-XX, -X suffixes) that may differ slightly from original ones, and the availability status of certain parts (marked with "*") that may require anticipation of delay for ordering.
Abbreviations: Clarifications for abbreviations used in the manual, such as regional codes (EA for Saudi Arabia, UAE for United Arab Emirates, E15 for 220-240V AC Area, SP for Singapore, E23 for 110-120V AC Area) and component specifications (u for micro, F for nonflammable resistors).

Sony CFM-D1 - Schematic Diagrams

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