Sony XR-3758 - User Manual

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Summary

Servicing Notes

Flexible Circuit Board Repair

Guidelines for repairing flexible circuit boards, including temperature control.

Chip Component Replacement Precautions

Advice on replacing chip components and handling tantalum capacitors.

Exploded Views - Chassis Section

Chassis Section

Exploded view of the chassis assembly components.

Exploded Views - Front Panel Section

Front Panel Section

Exploded view of the front panel assembly components.

Exploded Views - Mechanism Deck Section 1

Mechanism Deck Section 1

Exploded view of the mechanism deck section 1 components.

Exploded Views - Mechanism Deck Section 2

Mechanism Deck Section 2

Exploded view of the mechanism deck section 2 components.

Main Section Diagrams

Printed Wiring Boards - Main Section

Printed wiring layout for the main circuit board.

Schematic Diagram - Main Section

Electrical schematic for the main circuit board.

Key Section Diagrams

Printed Wiring Board - Key Section

Printed wiring layout for the key control section.

Schematic Diagram - Key Section

Electrical schematic for the key control section.

Summary

Servicing Notes

Flexible Circuit Board Repair

Guidelines for repairing flexible circuit boards, including temperature control.

Chip Component Replacement Precautions

Advice on replacing chip components and handling tantalum capacitors.

Exploded Views - Chassis Section

Chassis Section

Exploded view of the chassis assembly components.

Exploded Views - Front Panel Section

Front Panel Section

Exploded view of the front panel assembly components.

Exploded Views - Mechanism Deck Section 1

Mechanism Deck Section 1

Exploded view of the mechanism deck section 1 components.

Exploded Views - Mechanism Deck Section 2

Mechanism Deck Section 2

Exploded view of the mechanism deck section 2 components.

Main Section Diagrams

Printed Wiring Boards - Main Section

Printed wiring layout for the main circuit board.

Schematic Diagram - Main Section

Electrical schematic for the main circuit board.

Key Section Diagrams

Printed Wiring Board - Key Section

Printed wiring layout for the key control section.

Schematic Diagram - Key Section

Electrical schematic for the key control section.

The Sony XR-3758/3759 is a car stereo system designed to provide FM/MW/LW radio reception and cassette playback capabilities. This service manual details the internal components, diagrams, and repair procedures for the UK model, with specific notes indicating similarities and differences between the XR-3758, XR-3759, and the XR-3750 UK model.

Function Description:

The device serves as an in-car entertainment system, offering a combination of radio and cassette playback. The radio tuner supports FM, MW (Medium Wave), and LW (Long Wave) bands, allowing users to access a wide range of broadcasts. The integrated cassette player enables the playback of audio cassettes, a common media format at the time of its manufacture. The system is designed for easy integration into a vehicle's dashboard, featuring a front panel with various control buttons and an LCD display for user interaction.

Important Technical Specifications:

While detailed electrical specifications like power output or frequency response are not explicitly listed in the provided pages, the manual does offer insights into key components and their types.

Tape Transport Mechanism: The system utilizes the MG-52A-135 tape transport mechanism, indicating a standard cassette deck design.
Fuses: A 10A blade-type auto fuse (F801, Part No. 1-532-877-11) is specified for power protection.
Display: An LCD display panel (LCD901, Part No. 1-801-678-11) is used for visual feedback, illuminated by two pilot lamps (PL901, PL902, Part No. 1-517-567-11) for backlighting.
Integrated Circuits (ICs): Key ICs include the LC75834JED (IC901) on the KEY board, and on the MAIN board, the CXA2509AQ-T4 (IC301), MM1322XFBE (IC361), LC75373ED (IC401), uPD17707GC-521-3B9 (IC501), XC61AN4002PR (IC502), BA3918-V2 (IC601), and HA13155 (IC751). These ICs likely handle various functions such as display control, audio processing, micro-controller operations, and power management.
Transistors: A variety of transistors are listed, including DTA114EKA, 2SC1623-L5L6, 2SK1828, DTC314TKH04, 2SD1760F5-TLPQR, 2SB1115A, DTC114EK, and 2SD2525, indicating a mix of general-purpose, switching, and power transistors for different circuit stages.
Connectors: The system uses specific connectors for internal wiring, such as the FFC/FPC (ZIF) 7P connector (CN301) and a 12P plug connector (CN602). ISO connectors (CN802) are also mentioned for external connections, ensuring compatibility with standard car audio wiring.
Capacitors and Resistors: A wide range of ceramic chip, electrolytic, and film capacitors are used, with values from 10PF to 3300uF and voltage ratings up to 50V. Resistors are primarily metal chip and carbon types, with various resistance values, tolerances (0.5% to 5%), and power ratings (1/10W to 1W).
Coils and Inductors: Inductors and coils are present, including a 1uH inductor (L1) and a 10uH inductor (L501), likely for filtering and tuning circuits.
Diodes: Various diodes are listed, including Zener diodes (DTZ5.1B, RD6.2M-B1, UZ-4.7BSC, RD10ESB2, RD3.9ES-B2, RD7.5ESB2, MTZJ-T-77-9.1B, MTZJ-T-77-16C, MTZJ-7.5B, MTZJ-6.2B) and switching diodes (1N5404TU, 1SS133T-77, 1SR139-400), indicating their use in power regulation, signal rectification, and protection circuits.
Crystal Vibrator: A 4.5MHz crystal vibrator (X501) is used, typically for clock generation in digital circuits.

Usage Features:

The front panel design suggests user-friendly controls.

Buttons: Dedicated buttons are provided for various functions, including BASS (51), SOURCE (57), SEEK AMS (58), MUTE (58), and numbered presets (59). There are also buttons for volume control (L2) and cassette release (53).
Switches: Rotary slide switches are used for power select (S801) and tape operation (S901). Numerous key board switches (LSW901-LSW930) with integrated LEDs control functions such as OFF, SOURCE, MODE, SEEK/AMS, volume adjustment, SEL (select), BTM (bottom), LCL (local), 1/INTRO, 2/REPEAT, 3, 6/BL.SKIP, 5/ATA, 4/MTL, and DSPL (display). This indicates a comprehensive set of controls for radio tuning, cassette playback, and display options.
Jacks: An antenna jack (J1) and a remote-in jack (J501) are available for external connections.

Maintenance Features:

The service manual provides crucial information for technicians.

Exploded Views: Detailed exploded views of the chassis section, front panel section, and mechanism deck sections (MG-52A-135) are provided, showing the assembly of all components. This is essential for disassembly and reassembly during repairs.
Diagrams: Printed wiring board layouts and schematic diagrams for the MAIN and KEY sections are included, allowing technicians to trace circuits and identify components.
Electrical Parts List: A comprehensive list of all electrical parts, including their part numbers, descriptions, and remarks (e.g., tolerance, voltage, power rating), is provided. This list distinguishes between stocked and non-stocked items, informing about potential delays for certain parts.
Servicing Notes: Specific instructions are given for flexible circuit board repairing, including recommended soldering iron temperature (around 270°C) and precautions against touching conductors multiple times or applying excessive force. Notes on chip component replacement advise against reusing disconnected components and caution about heat damage to tantalum capacitors.
Hardware List: A list of screws and other hardware components is provided, along with their specifications, which is useful for ensuring proper fastening during repairs.
Accessories & Packing Materials: Information on the case assembly and instruction manuals is included.
Parts for Installation and Connections: A list of installation accessories such as fitting screws, bushings, ground cords, antenna adaptors, and tapping screws is provided, indicating the necessary components for installing the unit in a vehicle.

Overall, the Sony XR-3758/3759 is a robust car stereo system, and its service manual is a thorough guide for understanding, maintaining, and repairing the device.