DigiTech QM3793 - User Manual

This document describes the Digitech Bluetooth® Media Player Head Unit, model QM3793, an in-car media player designed for entertainment and connectivity.

Function Description

The Digitech Bluetooth® Media Player Head Unit is a versatile in-car entertainment system that supports various media playback options, radio, Bluetooth connectivity, and smartphone integration via Apple CarPlay and Android Auto. It features a touch screen display for intuitive operation and can be controlled through both the touch screen and a remote control handset.

Core Functions:

• Media Playback: Supports playback of digital files from USB devices and Micro SD cards. Compatible media files include 1080p, RMVB, MPEG4, MP3, WMA, and JPEG.
• Radio: Provides FM and AM radio reception with automatic and manual tuning, as well as preset station storage.
• Bluetooth Operation: Allows wireless connection to mobile phones for hands-free calling, phonebook access, call logs, and music streaming.
• Smartphone Integration: Supports Apple CarPlay and Android Auto for seamless integration with compatible smartphones, enabling access to navigation, messages, music, and other apps directly from the head unit's screen.
• Auxiliary Input: Features an AUX input for connecting external audio devices.
• Video Input: Includes RCA inputs for a reversing camera and another external video device.
• Steering Wheel Control: Compatible with steering wheel controls for convenient operation while driving.
• Front Camera Support: Can connect to a front camera for additional viewing options.

Important Technical Specifications

• Model: QM3793
• Power Supply: DC 12V negative ground operation system.
• Operating Temperature: -20 to +60 degrees Celsius.
• Screen Resolution: 1024 x 600 pixels.
• Bluetooth Version: 4.0.
• External Microphone: Supported.
• Speaker Power Output: 4 x 50W.
• Android Auto Compatibility: Android 6.0 onwards.
• Apple CarPlay Compatibility: iOS 7 onwards (iPhone 5 or later).
• Supported Audio Formats: MP3, WMA, WAV, APE, OGG, AAC.
• Video Input: 1 x RCA for reversing camera, 1 x RCA for other devices.
• Radio Pre-sets: FM 18 presets, AM 12 presets.
• Dimensions: 170 x 96 x 60mm.

Usage Features

Main Unit Operation: The head unit features several physical controls in addition to its touch screen:

• RES/RST: A reset button (requires a pointed object) to restore factory default settings.
• POWER (⏁): Press to turn on, press and hold to turn off.
• M/N/MENU: Shifts between the main menu and current operation mode.
• VOL+ / VOL-: Rotary knob to adjust volume.
• MUTE (⏚): Toggles sound on/off.
• IR: Remote control sensor.
• AUX: Auxiliary input jack.
• USB: USB slot for digital file playback.
• MICRO SD: Micro SD card slot for digital file playback.
• MIC: For voice reception during Bluetooth operation.
• SCREEN: Touch display for all operations.

On-Screen Main Menu Operation: The main menu is the central hub for accessing various functions. Users can navigate by touching icons on the screen and sliding to reveal hidden icons.

• Calendar & Clock Setup: Access by touching the calendar icon.
• Radio Operation: Initiated by touching the "Radio" icon (requires antenna connection).
• Mobile Phone Mirror Linking (P-Link): Starts the mirror linking function (requires mobile phone connection).
• USB Input Operation: Activated when a USB device is inserted and the "USB" icon is touched.
• SD Card Input Operation: Activated when a Micro SD card is inserted and the "SD" icon is touched.
• Bluetooth Operation: Starts Bluetooth functions when a mobile phone is paired and the "Bluetooth" icon is touched.
• Auxiliary Input Operation: Initiated when an auxiliary device is inserted and the "AV in" icon is touched.
• Screen Brightness/Off: Repeatedly touching a specific icon cycles through brightness modes or turns off the screen. Touching any part of the screen turns it back on.
• Front Camera Viewing: Activated by touching the "F-CAM" icon (requires front camera connection).
• Wallpaper Selection: Repeatedly touching an icon allows selection of desired background wallpaper.
• System Setup Menu: Activates the "Setup" menu for various unit settings.
• Equalization Mode: Selects desired preset equalization modes.
• Steering Wheel Control Settings: Configures steering wheel controls.

On-Screen Setup Operation: The "Setting Menu" provides detailed configuration options:

• System Setup Menu: General system settings.
• Language Interface: Selects the desired system language.
• Audio Setup Menu: Configures various audio settings.
• Visual Setup Menu: Adjusts brightness, contrast, hue, saturation, and sharpness.
• Calendar & Clock Setup Menu: Sets calendar and clock.
• Bluetooth Setup Menu: Configures Bluetooth settings.
• Phone Link Setup Menu: Settings related to phone linking.
• SWC Setup Menu: Steering wheel control settings.
• Reset Setup: Resets the unit to ex-factory default stage.
• Version Menu: Displays unit details.
• Volume Control Bar: Activates an on-screen volume control bar for adjustment.

Radio Operation:

• FM/AM Selection: Switches between FM and AM bands.
• Auto Search & Save: Automatically searches and saves stations.
• Tuning: Upward/downward tuning for broadcasting stations. Manual tuning for fine adjustments.
• Stereo/Mono Mode: Selects stereo or mono reception for FM band.
• Preset Stations: Stores and recalls desired preset stations.

Bluetooth Operation:

• Pairing: Connects to mobile phones by searching for "CAR BT" and entering a password (0000 or 8888).
• BT Main Menu: Accesses phone dialing, phonebook, call logs, and music playback.

Apple CarPlay / Android Auto:

• Connection: Connects via USB port using an appropriate cable.
• Activation: Select the "P-Link" icon from the HOME screen.
• Requirements:
  • Apple CarPlay: iPhone with iOS 7.1 or later (iPhone 5 or later).
  • Android Auto: Android phone with Android 5.0 or higher, requires Android Auto app from Google Play.
• GPS: Utilizes the smartphone's GPS, so the phone should be placed where it can receive a GPS signal.

Reversing Camera Connection:

• Automatic Display: Connects to an optional reversing camera (QC3530 or QC3532 recommended) to automatically display video when reverse gear is selected.
• Wiring: Camera is powered by the reverse light (12VDC). A video extension cable sends video to the head unit. A red "Reverse Switch" wire sends a +12VDC signal to trigger the reverse camera video.
• Handbrake Connection: The U13 wire must be connected to ground via the handbrake to enable video playback from USB sticks.

Second Camera Connection (Front Camera):

• Manual Display: Connects to the "F-Cam" socket. Video is manually displayed by pressing the "F-Cam" icon on the head unit screen.
• Wiring: Does not require the "Reverse Switch" red wire. Connect the camera's red power wire to +12VDC, black power wire to -12VDC, and the yellow video plug to the F-CAM socket.

Maintenance Features

• Installation: Installation by a professional technician is highly recommended. Only use supplied screws. Mounting brackets and screws are typically supplied with the car, not the head unit.
• Troubleshooting: The manual provides a troubleshooting guide for common issues such as no power, no sound, no picture, unit hang-up, non-responsive buttons/screen, poor radio reception, remote handset malfunction, and Bluetooth not operating.
• Reset Function: The RES/RST button allows users to reset the unit to its factory default settings, which can resolve many operational issues.
• Fuse Replacement: If there is no power, check and replace the fuse with the proper value if blown.
• Antenna Check: For poor radio reception, ensure the antenna is properly inserted, connected, fully extended, and grounded.
• Remote Handset: If the remote doesn't work, replace the battery, point it directly at the sensor, and ensure the sensor surface is clean.
• Self-Repair Warning: Users are advised not to disassemble the unit themselves and to consult a service dealer if issues persist after troubleshooting.
• Temperature Management: Avoid operating in extreme temperatures and ensure vents/radiator panels are not blocked to prevent heat build-up and potential damage.