This document describes the NXT DIGITAL Digital Cable Receiver, model CHA045170A. It is a professional-grade set-top box (STB) designed for receiving digital cable television signals. The device is manufactured in India and complies with IS 13252(Part 1)/IEC60950-1 safety standards.

Function Description

The NXT DIGITAL Digital Cable Receiver is primarily used to receive and decode digital cable television signals, allowing users to watch various channels on their television sets. It supports both standard definition (SD) and high definition (HD) content, with a maximum resolution of up to 1080p. The device also includes features for recording television programs onto an external USB hard drive, managing favorite channels, and accessing an Electronic Program Guide (EPG).

Important Technical Specifications

Tuner:

Frequency Range: 110MHz to 858MHz
Input Impedance: 75 ohms unbalanced
Signal Input Level: 40-85dBuV
Symbol Rate: 6875

Demodulation:

Demodulator: 16/32/64/128/256QAM

Connections:

RF IN: F connector (for receiving television signal from cable)
AV: RCA (CVBS+L/R) (for connecting to television via AV cable)
HDTV: HDMI (for connecting to television via HDMI cable)
DC IN 12V: Used to connect a 12V DC adapter (power input)
USB: Connects to an external USB 2.0 device (for recording and PVR management)

Power:

Input: 100-240V ~ 50/60Hz

Display:

Resolution: Up to 1080p
Aspect Rate: 4:3, 16:9

Decoding:

Video: MPEG4/H.264, MPEG2, MPEG1
Audio: MPEG1, MPEG2 (Layer I/II), GAAC

Others:

Sound Mode: Right, Left, Stereo

Usage Features

Panel Controls: The top panel of the STB includes basic controls:

Power on/off: Toggles the device power.
Channel down: Navigates to the previous channel.
Channel up: Navigates to the next channel.

Remote Control: The remote control offers extensive functionality:

Power ON / Standby: Turns the device on or off.
Programme Recording Key (REC): Initiates recording of the current program.
Program Rewind / Forward (REW, FWD): Controls playback during PVR.
Help Key (HELP): Accesses system information (once) or channel information (twice).
Play/Pause in PVR (PLAY, STOP): Controls playback of recorded content.
Info Key / Program Synopsis (INFO): Displays program details.
Audio Language (LANG): Changes the audio language.
Function Keys (Red, Yellow, Blue): Red key manages recording schedule, Yellow key views messages/BMail, Blue key accesses USB/PVR manager.
Electronic Programme Guide (EPG): Displays the program schedule.
Menu Key (MENU): Accesses the main menu.
OK / Select (OK): Confirms selections.
Navigation Keys (Up, Down, Left, Right): Navigates through menus and options.
Back Key (BACK): Returns to the previous screen.
Exit Key (EXIT): Exits current menu or function.
NXT Digital Services (VAS): Accesses additional services.
Volume Up/Down (VOL +, -): Adjusts volume.
Channel Up/Down (CH +, -): Changes channels.
Favorites Key (FAV): Accesses the list of favorite channels.
Number & Alphabet Keys (0-9): Enters channel numbers or text.
Radio Channel (♫): Switches to radio channels.
Audio Mute (MUTE): Mutes or unmutes audio.

Installation and Setup:

First-time Installation: Requires connecting the STB to the television using either an HDMI cable (for HDTV) or AV cables (for AV input). The cable signal is connected to the RF IN port, and power is supplied via the 12V DC adapter.
Auto Search: After initial connection, users can perform an "Auto Search" from the "Search" menu to scan and find available channels.
Remote Control Programming: The remote control can be programmed to learn functions from another remote by entering a learning mode (holding SET key), pressing the learning key, aiming the remotes, and pressing the desired button to be learned.

Channel Management:

Saving Favorites: Users can access the "Program Edit" menu, select "Favorite," choose a favorite group, and then select channels to add or remove them from that group. Changes must be confirmed by pressing "OK" to save.

Recording Features:

Recording on USB Hard Drive: The device supports recording programs to an external USB 2.0 device.
- Instant Recording: Pressing the "REC" key on the remote during live TV initiates immediate recording.
- Scheduled Recording: Users can schedule recordings by navigating to "Menu" -> "Option" -> "Schedule." Within the schedule menu, users can add new events, specifying channel type, number, name, start/end date/time, repeat options, and mode (record).
- EPG Recording: The "EPG" (Electronic Program Guide) allows users to select a program and set it to record or set a reminder using the Yellow color button on the remote.
Stopping Recording: An ongoing recording can be stopped by pressing the "STOP" key on the remote.
Viewing Recorded Channels: Recorded content can be accessed via "Main menu" -> "USB" -> "PVR."

Maintenance Features

Safety Instructions: The manual emphasizes several safety instructions:

Read and keep all instructions and heed all warnings.
Do not use near water or expose to liquids, rain, or moisture.
Clean only with a dry cloth.
Ensure proper ventilation; do not block openings or install near heat sources.
Protect the power cord from damage.
Use only manufacturer-specified attachments/accessories.
Unplug during lightning storms or long periods of disuse.
Refer all servicing to qualified personnel.
Do not open the apparatus due to risk of electric shock.
Batteries should not be exposed to excessive heat.
Dispose of batteries environmentally.
Apparatus should be used in moderate climate conditions.

Troubleshooting Guide: The manual provides a troubleshooting section for common issues:

No picture: Check power connection, STB/power adapter functionality, and RF cable connection.
"No Signal" message: Check RF cable connection and settings.
No sound: Check audio cable connection, STB/television mute status, and sound track language.
Audio only, no video: Check HDMI cable, or confirm if it's a radio channel.
Remote control not working: Replace batteries, ensure line of sight to STB, and check distance.
Frozen or mosaic images: Likely due to weak signal; check RF cable condition and connection.

Environmental Considerations: The device bears a marking indicating it should not be disposed of with other household waste in India. Users are encouraged to recycle the apparatus responsibly through return and collection systems to promote sustainable reuse of materials and prevent harm to the environment.

NXT Digital CHA045170A - Page 9

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