1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your mijob Tuya Smart Digital Electronic Door Lock. This lock offers multiple access methods including fingerprint, password, RFID card, mechanical key, and Tuya app control. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Safety Information
- Do not expose the lock to direct sunlight or rain for extended periods.
- Avoid using corrosive substances or sharp objects on the lock surface.
- Ensure correct battery polarity when installing or replacing batteries.
- Keep mechanical keys in a secure location outside the property.
- Do not attempt to disassemble or repair the lock yourself. Contact qualified personnel for service.
- Regularly check the lock for any signs of damage or malfunction.
3. Package Contents
Verify that all components are present before beginning installation:
- Front Panel Assembly (with keypad and fingerprint reader)
- Rear Panel Assembly (with battery compartment)
- Mortise Lock Body (5572 20x235)
- Strike Plate and Strike Box
- Mounting Screws and Spindles
- Mechanical Keys (2)
- RFID Cards (2)
- User Manual
4. Product Overview
Familiarize yourself with the main components of your smart door lock:

Figure 4.1: Front and Rear Panel Components. The front panel features an LED indicator, digital keypad, IC card reader, and fingerprint reader. The rear panel includes the battery box and a free handle. A USB power supply port and keyhole are located at the bottom of the front panel.
- LED Indicator: Displays lock status and alerts.
- Digital Keypad: For entering passwords.
- IC Card Reader: For unlocking with RFID cards.
- Fingerprint Reader: For biometric unlocking.
- Free Handle: Allows for easy exit from the inside.
- USB Power Supply: Emergency power port (Type-C).
- Key Hole: For mechanical key override.
- Battery Box: Houses 4 AA batteries.
5. Setup and Installation
5.1 Pre-installation Check
Ensure your door is compatible with the lock's specifications:
- Door Type: Suitable for wooden doors, stainless steel doors, bronze doors, double doors, and old-fashioned security doors.
- Mortise Size: This model uses a 5572 20x235 mortise. Confirm your door's mortise cutout matches these dimensions.

Figure 5.1: Mortise Dimensions and Lock Panels. This image illustrates the specific measurements of the 5572 20x235 mortise, crucial for proper installation, alongside the front and rear panels of the smart lock.
5.2 Installation Steps
Follow these steps carefully for proper installation:
- Prepare the Door: If replacing an existing lock, remove it. Ensure the door's mortise cutout matches the 5572 20x235 dimensions.
- Install the Mortise: Insert the mortise lock body into the door edge. Secure it with screws.
- Install Spindles: Insert the square spindle through the mortise.
- Connect Front Panel: Route the cable from the front panel through the door. Align the front panel with the spindle and mounting holes.
- Connect Rear Panel: Connect the cable from the front panel to the rear panel. Align the rear panel with the spindle and mounting holes.
- Secure Panels: Use the provided screws to secure both the front and rear panels to the door, ensuring they are flush and stable.
- Install Batteries: Open the battery cover on the rear panel and insert 4 AA alkaline batteries, observing correct polarity.
- Install Strike Plate and Box: Install the strike plate and strike box on the door frame, ensuring proper alignment with the mortise latch and deadbolt.
- Test Operation: Test the mechanical key, handles, and deadbolt to ensure smooth operation before proceeding to programming.
6. Operating Instructions
The mijob smart lock offers multiple ways to unlock your door:

Figure 6.1: Available Unlock Methods. This image visually represents the six primary methods for unlocking the smart door lock: via the mobile app, fingerprint, password, RFID card, mechanical key, and temporary password.
6.1 Tuya App Setup
- Download App: Search for 'Tuya Smart' or 'Smart Life' in your mobile app store (iOS/Android) and download the application.
- Register/Login: Create an account or log in if you already have one.
- Add Device: In the app, tap '+' to add a new device. Select 'Security & Video Surveillance' > 'Door Lock (Wi-Fi)'.
- Pair Lock: Follow the in-app instructions to put the lock into pairing mode (usually by pressing a specific button on the lock or entering a master code). Connect the lock to your Wi-Fi network.
6.2 Fingerprint Management
The lock supports up to 100 fingerprints.
- Add Fingerprint: Access the lock's menu (via master password or app). Select 'Add Fingerprint'. Place your finger on the reader multiple times as prompted until registration is complete.
- Delete Fingerprint: Access the lock's menu. Select 'Delete Fingerprint' and choose the specific fingerprint or delete all.
6.3 Password Management
The lock supports up to 300 passwords (including fingerprints and cards).
- Set Master Password: This is the first password you set and is used to access the lock's programming menu.
- Add User Password: Access the lock's menu. Select 'Add Password' and enter a new password (6-10 digits).
- Delete User Password: Access the lock's menu. Select 'Delete Password' and choose the specific password or delete all.
- Temporary Password: Generate time-limited or dynamic passwords via the Tuya app for guests or service providers.

Figure 6.2: Generating a Temporary Password via Tuya App. This image shows the process within the Tuya app for creating and sharing a time-limited or dynamic password, useful for granting temporary access.
6.4 Card Management
The lock supports 13.56MHz Mifare cards and phone NFC cards.
- Add Card: Access the lock's menu. Select 'Add Card'. Present the RFID card or NFC-enabled phone to the card reader until registered.
- Delete Card: Access the lock's menu. Select 'Delete Card' and choose the specific card or delete all.
6.5 Remote Unlock (via Tuya App)
The Tuya app allows for remote unlocking without a gateway.
- Initiate Request: From the outside, press '9 + #' on the lock's keypad.
- Receive Notification: The Tuya app on your paired smartphone will receive an unlock request notification.
- App Unlock: Open the app and confirm the unlock request to remotely open the door.

Figure 6.3: Remote Unlocking Process. This image demonstrates how to initiate a remote unlock request from the lock's keypad and then confirm it through the Tuya app on a smartphone.
7. Maintenance
7.1 Battery Replacement
The lock is powered by 4 AA batteries. When the battery level is low, the lock will provide an audible or visual alert. Replace all four batteries simultaneously.
- Locate the battery compartment on the rear panel.
- Remove the battery cover.
- Remove the old batteries and dispose of them responsibly.
- Insert new AA alkaline batteries, ensuring correct polarity (+/-).
- Replace the battery cover.
Emergency Power: If batteries completely drain, connect a Type-C USB power bank to the emergency power port at the bottom of the front panel to temporarily power the lock and gain access.
7.2 Cleaning
Clean the lock regularly to maintain its appearance and functionality.
- Use a soft, dry cloth to wipe the lock surface.
- For stubborn marks, use a slightly damp cloth with mild soap, then wipe dry immediately.
- Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish and electronic components.
- Keep the fingerprint reader and keypad clean and free of debris for optimal performance.
8. Troubleshooting
Refer to the table below for common issues and their solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Lock does not respond | Dead batteries | Replace all 4 AA batteries. Use emergency USB power if needed. |
| Fingerprint not recognized | Finger wet/dirty, incorrect placement, unregistered fingerprint | Ensure finger is clean and dry. Place finger correctly. Re-register fingerprint if issue persists. |
| Password not accepted | Incorrect password, keypad malfunction | Verify password. Try mechanical key. Check for keypad damage. |
| RFID card not working | Unregistered card, incorrect card type | Ensure card is registered. Verify it is a 13.56MHz Mifare card. |
| Lock is loose on door | Mounting screws loose | Tighten all mounting screws. |
| Tuya App connection issues | Wi-Fi signal weak, incorrect pairing, app outdated | Check Wi-Fi signal strength. Re-pair the lock with the app. Update Tuya app to the latest version. |
9. Specifications
- Model: 5572 20x235
- Lock Material: Aluminum Alloy
- Power Supply: 4 x AA Batteries
- Unlock Methods: Fingerprint, Password, RFID Card, Mechanical Key, Tuya App
- Fingerprint Capacity: 100
- Password/Card Capacity: 300 (combined with fingerprints)
- Card Type: 13.56MHz Mifare Card, Phone NFC Card Support
- Emergency Power: USB Type-C
- Working Temperature: -25°C to 60°C (-13°F to 140°F)
- Working Humidity: 20% to 90% RH
- Door Type Compatibility: Wooden Door, Stainless Steel Door, Bronze Door, Double Door, Old-fashioned Security Doors
- Item Weight: Approximately 1.76 ounces (lock components only)
10. Support
For further assistance, technical support, or warranty inquiries, please contact your retailer or the manufacturer directly. Please have your product model and purchase information ready when contacting support.