Introduction
This manual provides comprehensive instructions for the Redi-Remote replacement remote control, designed for use with Nexus NX4203P and EN21645 units. This remote is a custom-built replacement and is not an original Nexus product. It is engineered to perform all functions of the specific units it is designed to control without requiring additional programming.
Setup
Battery Installation
The Redi-Remote requires four (4) AAA batteries for operation. These batteries are typically included with your purchase. To install the batteries:
- Locate the battery compartment on the back of the remote control.
- Slide open the battery compartment cover.
- Insert four AAA batteries, ensuring correct polarity (+ and -) as indicated inside the compartment.
- Close the battery compartment cover securely.
Note: This Redi-Remote is designed for immediate use and does not require programming to control the specified Nexus units (NX4203P, EN21645). It cannot be programmed to control auxiliary devices.

Image 1: Front view of the Redi-Remote replacement control. It features a dark gray body with various control buttons, including power, volume, channel, and a numeric keypad. The lower section has a sliding cover revealing additional function buttons.
Operating Instructions
Basic Functions
- PWR (Power): Turns the Nexus unit on or off.
- TV/VIDEO: Switches between TV and video input modes.
- VOL + / VOL - (Volume): Increases or decreases the audio volume.
- CH + / CH - (Channel): Changes channels up or down.
- MUTE: Silences the audio output.
- MENU: Accesses the main menu of the Nexus unit.
- DISP (Display): Shows on-screen information.
- RECALL: Returns to the previously viewed channel.
- Number Buttons (0-9, 100): Directly input channel numbers.
- ENT (Enter): Confirms channel number input or menu selections.
- SLEEP: Activates the sleep timer function.
Advanced Functions (Under Sliding Cover)
The lower half of the remote control features a sliding cover. Slide this cover down to reveal additional function buttons.
- INPUT: Selects different input sources (e.g., HDMI, AV).
- PICTURE: Adjusts picture settings.
- AUDIO: Adjusts audio settings.
- ZOOM: Changes the screen zoom level.
- LAST: Returns to the last menu or setting.
- GUIDE: Accesses the electronic program guide.
- EXIT: Exits the current menu or function.
- CCD (Closed Captioning): Toggles closed captions on or off.
- MTS/SAP: Selects Multi-channel Television Sound/Secondary Audio Program.
- TIME: Accesses time-related functions.
- Directional Arrows (Up, Down, Left, Right): Navigates through menus and options.
- ENTER: Confirms selections within menus.
- RED, GREEN, YELLOW, BLUE: Color-coded function buttons, typically used for specific features in menus or interactive services.
Maintenance
To ensure the longevity and proper functioning of your remote control:
- Keep the remote clean by wiping it with a soft, dry cloth. Avoid using liquid cleaners or abrasive materials.
- Do not expose the remote to extreme temperatures, direct sunlight, or high humidity.
- If the remote will not be used for an extended period, remove the batteries to prevent leakage.
- Avoid dropping the remote or subjecting it to strong impacts.
Troubleshooting
- Remote not responding:
- Check if the batteries are inserted correctly with the correct polarity.
- Replace old batteries with new AAA batteries.
- Ensure there are no obstructions between the remote and the Nexus unit's infrared sensor.
- Confirm the remote is pointed directly at the Nexus unit.
- Specific functions not working:
- Verify that the Nexus unit is powered on and functioning correctly.
- Ensure you are using the correct remote for your specific Nexus model (NX4203P or EN21645). This remote is not compatible with other Nexus devices, such as the Nexus Player.
Specifications
| Brand | Redi-Remote |
| Model Number | RTEN21645 |
| Compatible Nexus Models | NX4203P, EN21645 |
| Product Dimensions | 7 x 2.5 x 1 inches |
| Item Weight | 4.5 ounces |
| Batteries Required | 4 AAA batteries (included) |
| Connectivity Technology | Infrared |
| Special Feature | No Programming Required |
| Max Number of Supported Devices | 1 |
Support
For any concerns or issues with your Redi-Remote replacement control after purchase, please contact the manufacturer directly for assistance. Refer to your purchase documentation for contact information.