1. Introduzione
This manual provides detailed instructions for the safe and effective use of your Mastfuyi Network Cable Tester and Line Finder, Model FY8233E. This device is designed for professionals and enthusiasts to perform various cable testing and tracing functions, including network cable sequence detection, open/short circuit identification, RJ11/RJ45 cable tracking, telephone line status detection, and cable level/polarity detection.

Figure 1: Mastfuyi Network Cable Tester and Line Finder (Model FY8233E) with included accessories.
2. Informazioni sulla sicurezza
Si prega di leggere attentamente tutte le avvertenze di sicurezza e le istruzioni per l'uso prima di utilizzare questo strumento. Il mancato rispetto di queste istruzioni può causare scosse elettriche, incendi o lesioni gravi.
- Do not expose the product to direct sunlight, extreme temperatures, or high humidity.
- Assicurarsi che il dispositivo sia spento prima di collegare o scollegare i puntali di prova.
- Per garantire letture accurate, sostituire tempestivamente le batterie quando compare l'indicatore di batteria scarica.
- Non tentare di misurare il voltages exceeding the specified limits of the device.
3. Componenti del prodotto
The Mastfuyi Network Cable Tester and Line Finder typically includes the following components:
- Main Transmitter Unit
- Receiver/Probe Unit
- RJ11 Test Lead
- RJ45 Test Lead
- Alligator Clip Test Lead
- AAA Batteries (for power)
- Custodia per il trasporto
- Manuale d'uso

Figure 2: Labeled components of the Mastfuyi FY8233E device. Note: This image illustrates a digital multimeter, but general button and display locations are similar for many handheld testers.
4. Impostazione
4.1 Installazione della batteria
- Individuare il vano batterie sul retro dell'unità principale.
- Aprire il coperchio del vano batterie.
- Inserire le batterie AAA richieste, assicurandosi della corretta polarità (+/-).
- Chiudere saldamente il coperchio del vano batterie.
4.2 Collegamento dei puntali di prova
Before use, ensure the test leads are properly connected to the main unit.
- Inserire il puntale di prova rosso nel jack di ingresso positivo (+).
- Insert the black test lead into the common (COM) input jack.
- Ensure the caps are removed from the test lead tips before making any measurements.

Figure 3: Always remove protective caps from test leads before use.
5. Istruzioni per l'uso
The Mastfuyi Network Cable Tester offers multiple functions for diagnosing network and telephone cables.
5.1 Cable Sequence Calibration (Network Cable Test)
This function detects the wiring sequence, open circuits, short circuits, wrong pairs, and reverse connections in network cables (Cat5, Cat6).
- Collegare un'estremità del cavo di rete alla porta RJ45 sull'unità trasmittente principale.
- Connect the other end of the network cable to the RJ45 port on the receiver unit (if applicable, or the remote unit).
- Turn the function knob on the main unit to the 'NETWORK' or 'TEST' position (refer to device markings).
- Observe the LED indicators or display on both units. They will light up in sequence, indicating the wiring status. Any deviation (e.g., missing lights, incorrect sequence, or lights indicating short/open) will identify the fault.
5.2 RJ45/RJ11 Cable Tracking (Line Finding)
This feature allows you to locate a specific cable within a bundle without stripping its insulation.
- Connect the RJ45 or RJ11 cable to be traced to the corresponding port on the main transmitter unit.
- Turn the function knob on the main unit to the 'SCAN' or 'TONE' position. The transmitter will generate an audible tone.
- Use the receiver/probe unit to scan along the cable path. The probe will emit an audible sound, which will be loudest when it is near the target cable.
- Adjust the sensitivity of the receiver if available, to pinpoint the exact cable.
5.3 Telephone Line Status Detection
This function helps determine the operational status of a telephone line (idle, ringing, off-hook) and identify TIP or RING lines.
- Connect the RJ11 test lead to the telephone line and the corresponding port on the main unit.
- Turn the function knob to the 'PHONE' or 'LINE' position.
- The device will indicate the line status (e.g., LED for idle, flashing for ringing, continuous for off-hook) and identify the TIP and RING lines.
5.4 Cable Level and Positive/Negative Polarity Detection
Use the transmitter to detect the DC level or positive and negative polarity of a line.
- Connect the test leads to the line you wish to test.
- Selezionare il volume DC appropriatotage or polarity detection mode on the main unit.
- Il display mostrerà il DC voltage level and indicate the polarity (positive or negative).
5.5 Transmitter Undervoltage Indicazione
The device includes a low battery warning to ensure reliable operation.
- When the function knob of the transmitter is set to the 'SCAN' position, if the transmitter's battery voltage falls below the operational threshold, the 'SCAN' indicator will flash.
- When this indicator flashes, replace the batteries immediately to maintain accuracy and functionality.
5.6 funzioni aggiuntive

Figure 4: The device features a bright LCD backlight, a protective rubber sheath, and a stable back bracket for convenience.
- Bright LCD Backlight: Migliora la visibilità in ambienti scarsamente illuminati.
- Protective Rubber Sheath: Provides durability and protection against drops and impacts.
- Stable Back Bracket: Consente al dispositivo di stare in posizione verticale per consentirne l'utilizzo a mani libere.
6. Manutenzione
6.1 Sostituzione della batteria
When the undervoltage indicator flashes, replace the batteries:
- Assicurarsi che il dispositivo sia spento.
- Aprire il vano batteria sul retro.
- Rimuovere le vecchie batterie e smaltirle secondo le normative locali.
- Inserire nuove batterie AAA, rispettando la polarità corretta.
- Chiudere bene il vano batterie.
6.2 Cura generale
- Mantenere il dispositivo pulito e asciutto. Pulire con un panno morbido e asciutto.amp panno se necessario. Non utilizzare detergenti abrasivi o solventi.
- Quando non lo si utilizza, riporre il dispositivo nella sua custodia per proteggerlo da polvere e danni.
- Avoid exposing the device to extreme temperatures or humidity, as this can affect its performance and lifespan.
7. Risoluzione Dei Problemi
If you encounter issues with your Mastfuyi Network Cable Tester, refer to the following common problems and solutions:
- Il dispositivo non si accende: Controllare l'installazione delle batterie e assicurarsi che non siano scariche. Sostituirle se necessario.
- No tone during cable tracking: Ensure the transmitter is set to 'SCAN' or 'TONE' mode and the cable is properly connected. Check the receiver's battery.
- Inaccurate cable test results: Verify that the test leads are securely connected and the cable under test is not damaged. Ensure batteries are not low.
- Difficulty pinpointing a cable: Adjust the sensitivity of the receiver probe. Ensure there are no strong electromagnetic interferences nearby.
- Display shows 'OL' or 'Err': This may indicate an over-range condition or a fault in the circuit being tested. Refer to specific error codes in the full user manual if available.
8. Specifiche
| Caratteristica | Specificazione |
|---|---|
| Numero di modello | FY8233E |
| Produttore | Mastfuyi |
| Fonte di alimentazione | Alimentato a batteria (AAA) |
| Peso dell'articolo | 200 grammi (7.05 once) |
| Dimensioni del pacco | 7.83 x 4.61 x 1.93 pollici |
| Tipi di cavi supportati | RJ11, RJ45 (Cat5, Cat6) |
| Funzioni | Cable Sequence, Open/Short Circuit, Wrong Pair, Reverse Connection, Line Tracking (Tone), Telephone Line Status, Cable Level/Polarity Detection |
9. Garanzia e supporto
For warranty information and technical support, please refer to the documentation included with your purchase or contact Mastfuyi customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
For further assistance, you may visit the official Mastfuyi store online: Mastfuyi Store





