The device described in this manual is a Gauge Style Media Center, designed for marine audio applications. It functions as a comprehensive media hub, supporting various audio sources including FM/AM radio, USB, and Bluetooth (BT). The device is designed for easy installation and operation, featuring a circular, gauge-style form factor with intuitive button controls.

Function Description:

The Media Center serves as a central control unit for audio playback in a marine environment. Its primary functions include:

Audio Playback: Supports playback from multiple sources.
Radio Tuner: Includes an FM/AM radio tuner with preset capabilities.
USB Connectivity: Allows for audio playback from USB devices.
Bluetooth Connectivity: Enables wireless audio streaming from paired devices.
Audio Control: Provides basic audio adjustments such as volume, bass, treble, balance, fader, and EQ.

Important Technical Specifications:

Based on the provided diagrams and text, the following technical specifications can be inferred:

Dimensions:
- Front Diameter: Approximately 113.00 mm (4.45 inches)
- Mounting Hole Diameter: Approximately 101.00 mm (3.98 inches)
- Depth (excluding front bezel): Approximately 72.75 mm (2.86 inches)
- Overall Depth (including front bezel and connectors): Approximately 89.50 mm (3.52 inches)
- Mounting Screw Hole Diameter: Approximately 3.20 mm (0.13 inches)
Power Requirements:
- Fuse 1A (for RED ACC wire)
- Fuse 10A (for YELLOW MEMORY wire)
Connectivity:
- Audio Outputs:
  - Rear Left (Green/Black, Green)
  - Rear Right (Purple/Black, Purple)
  - Front Left (White/Black, White)
  - Front Right (Gray/Black, Gray)
  - RCA Front (White, Red)
- Video Output: Video Out (White, Red)
- Input: AUX IN (White, Red)
- USB Port: For USB device connection.
- Antenna Input: Auto Antenna (Blue wire).
Device Name: "Marine audio" (for Bluetooth pairing).

Usage Features:

The Media Center is designed for straightforward operation with a clear button layout and a central display.

Button Layout:
- APS (1): Play/Pause button. Also used for Seek Up in radio mode and for accessing presets.
- Tune Down (2): Decreases tuning frequency or navigates backward.
- Tune Up (3): Increases tuning frequency or navigates forward.
- Power (4): Controls power on/off and volume adjustments (VOL+, VOL-).
- Mode (5): Switches between different audio sources (FM, AM, USB, BT, AUX). Also used to enter settings menu.
- Band (6): Selects radio bands (FM1, FM2, FM3, AM1, AM2) and functions as a repeat button for USB.
Basic Operations:
- Power On/Off: Press Power (4) button once for Power On. Hold Power (4) button for 2 seconds for Power Off.
- Volume Adjustment: Rotate Power (4) button to left for Volume Down, to right for Volume Up.
- Source Selection: Press Mode (5) button to cycle through available sources.
- Seek Up/Down: Press APS (1) once for Seek Up. Press Tune Down (2) or Tune Up (3) for tuning.
- Pause/Play: Press APS (1) once.
- Audio Settings: Press and Hold Mode (5) to enter Settings Menu. Press and Release Mode (5) to change Menu Items. Rotate Power (4) to adjust settings like Bass, Treble, Balance, Fader, Beep, EQ, Loud, and Tuner Region.
FM/AM Radio Features:
- Seek Up: Press APS (1) button once.
- Tune Up/Down: Hold Tune Up (3) or Tune Down (2) button for 1 second, then press again for continuous tuning.
- Presets: Press and Hold APS (1) button to program strongest stations into FM and AM presets. Pressing Tune Up (3) and Tune Down (2) will change preset stations. To set a custom preset, press Tune Up (3) for desired preset number, then use Manual Tune (Tune Up/Down) to change to desired station. Press Play/Pause (APS 1) to set new station into preset number.
USB Source Features:
- Next Track: Press Tune Up (3) button once.
- Previous Track: Press Tune Down (2) button once.
- Fast Forward: Hold Tune Up (3) button.
- Rewind: Hold Tune Down (2) button.
- Pause/Play: Press APS (1) button.
- Repeat: Press BAND (6) to repeat.
- Search: Not explicitly detailed, but likely involves navigation through folders/tracks.
Bluetooth (BT) Source Features:
- Next Track: Press Tune Up (3) button once.
- Previous Track: Press Tune Down (2) button once.
- Pause/Play: Press APS (1) button.
- Pairing Mode: When BT MUSIC is flashing, the marine audio is in pairing mode. Locate the device name "Marine audio" on your phone to pair.

Maintenance Features:

The manual provides information related to installation and regulatory compliance, which indirectly relates to maintenance and proper functioning.

Installation Overview: The wiring diagram details connections for power, speakers, RCA outputs, AUX input, USB, and antenna. This is crucial for correct installation and troubleshooting.
FCC Compliance: The device complies with part 15 of the FCC Rules, indicating it is designed to operate without causing harmful interference and to accept interference received.
Modifications: Users are cautioned against unauthorized changes or modifications, as these could void the user's authority to operate the equipment and potentially lead to harmful interference.
Interference Resolution: In case of radio or television interference, users are advised to try the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
RF Exposure: The device has been evaluated to meet general RF exposure requirements and can be used in portable exposure conditions without restriction.

Overall, the Gauge Style Media Center is a robust and user-friendly audio solution for marine environments, offering a range of connectivity options and intuitive controls within a compact, durable design.

Hasda H-301 - USB Source; Bluetooth (BT) Source

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