Sound Device 744T Audio Field Recorder with S/N: 460305111007

Preparation:
1. Gather tools and materials:
◦ Soft, dry cloth
◦ Compressed air can
◦ Cotton swabs
◦ Isopropyl alcohol (70% or higher)
◦ Phillips screwdriver (for internal access)
◦ Manufacturer's user manual for reference
2. Turn off the recorder and remove batteries.
3. Choose a clean, well-lit workspace.

External Preventive Maintenance:

1. Visual inspection:
◦ Thorough examination: Gently inspect the entire recorder for any physical damage like cracks, dents, loose screws, or broken buttons.
◦ Connectors: Pay close attention to the XLR inputs, headphone jack, and SD card slot for any bends, cracks, or signs of loose solder joints.
◦ Knobs and switches: Rotate all knobs and press all buttons, checking for smooth operation and absence of noise or scratchiness.
2. Cleaning:
◦ Exterior surfaces: Using the soft cloth, gently wipe down the entire recorder, removing any dust, dirt, or fingerprints. Avoid harsh chemicals or solvents.
◦ Connectors: Use the compressed air can to remove dust and debris from the XLR inputs, headphone jack, and SD card slot. Do not use any liquids or cleaning solutions.
◦ Battery compartment: Wipe the contacts with a clean cloth to remove any corrosion or build-up.

Internal Preventive Maintenance (Proceed with caution):

1. Open the internal compartment (if comfortable): Refer to the user manual for specific instructions on accessing the internal components. Use the Phillips screwdriver if necessary.
2. Dust removal:
◦ Compressed air: Carefully blow compressed air at low pressure to remove dust and debris from the circuit board, connectors, and other internal components. Avoid directly blowing on delicate components.
◦ Brush (optional): Use a soft, clean brush to gently remove any remaining dust.
3. Contact cleaning:
◦ Isopropyl alcohol: Dip a cotton swab in isopropyl alcohol and gently clean any oxidized or dirty contacts on the battery compartment, SD card slot, and other internal connectors.
◦ Drying: Allow the alcohol to evaporate completely before reassembling and powering on the recorder.

Reassembly and Final Checks:

1. Close the internal compartment securely (if opened).
2. Insert fresh batteries or connect to a power source.
3. Power on the recorder and perform a basic functionality test.
◦ Record a short audio clip and confirm sound quality on headphones and speakers.
◦ Test all inputs and outputs, ensuring proper signal levels and no distortion.
◦ Verify the functionality of all buttons, knobs, and menus.
4. Update firmware (optional): Check the Sound Devices website for the latest firmware version and update if available.