NOYAFA NF-826 Wireless Cable Detector User Manual

NOYAFA NF-826 Wireless Cable Detector

Please read and understand the safety precautions before using or servicing this equipment.

Precautions

1.  The working temperature of this tester is 0-40°C (32-104*F)
2. In order to avoid damage to the detector, severe mechanical vibration should be avoided during handling and use, especially to avoid falling accidents, and avoid long-term direct sunlight and strong electromagnetic areas.
3. Only professionals can calibrate and repair the detector.
4. Before each use, check whether the detector and the measuring line are damaged. Please make sure that the detector and the measuring line used are in good condition.
5. When using the detector, the rated voltage of the tested circuit cannot be greater than the rated voltage of 400V.
6. When the transmitter is connected to a live power grid, if the “ground” jack of the transmitter is connected to the protective ground, when there is leakage current in the power supply line, this leakage current and the loop current of the transmitter may combine, which may cause leakage The protection switch trips, which triggers the FI/RCD disconnection.

Product description

NF-826 Underground & In-Wall Cable Detector is a portable instrument, which consists of transmitter, receiver and accessories.
Selecting new integrated devices and digital circuit technology, the electrical performance is stable and reliable. According to the change of the signal, the specific location and fault of the buried cable or pipeline can be detected. It is suitable for the maintenance of communication cable construction, power cable construction, building pipeline construction, communication cable and power supply line and electric heating line.

Description of components and functions

Display interface description

There are 6 kinds of codes, namely A/C/E/F /H/L, which can be switched in cycles when setting

Accessories description

1. The connecting wire is used to connect the transmitter to the alligator clip or test pen

2. Alligator clip is used to clamp the target line

3. The test pen is used to touch the target line

4. The ground rod is used to connect to the underground in an environment where there is no ground wire, thereby increasing the test signal
   

Notice:

1. The red connecting wire-end is connected to the red alligator clip or red test pen, and the other-end is connected to the positive port of the transmitter.
2. The black connecting wire-one end is connected to a black alligator clip or a black test pen, the other-end is connected to the ground wire or the ground rod is connected to the ground.
3. The alligator clip has the same function as the test pen, and you can choose easy-to-operate accessories under different construction environments

Characteristics of Cable Locator NF-826
♦Detecting cables, electrical lines, water/gas supply pipelines buried in wall or earth;
♦ Detecting interruptions and short circuit in cables and electrical lines buried in wall or earth;
♦ Detecting fuses and assigning current circuits;
♦Tracing sockets and distribution sockets having accidentally been covered by plastering;
♦Detecting interruptions and short-circuits in floor heating;
♦The transmitter is integrated with the function of AC/DC voltmeter, which can measure 12 to 400V AC/DC voltage on a linear basis:
AC: 12 ~ 400V (50 to 60 Hz)± 2.5%
DC: 12 – 400V ±2.5%
♦The screen of the transmitter can display preset transmitting power, transmitted codes, its own battery energy, mains voltage detected, AC/DC status of mains voltage detected, and warning symbol for mains voltage.
♦The receiver can display the power level of the transmitter, the code of the
transmitter, and the battery level of the transmitter and its own battery power status, detected AC voltage induction signal and lightning warning symbol.
♦ Sensitivity adjustment function, mute function, automatic shutdown function, lighting function.
Three common methods of use

1. Look for underground cables Use the red clip (red needle) to clamp the cable that needs to be searched, and the black clip (black needle) to the ground wire, and the receiver traces the signal along the line to find the cable direction.
2. Look for short-circuit points of underground cables Use the red clip/black clip to clamp the short-circuited wire separately, adjust the sensitivity to an appropriate level, the receiver will sound before the short-circuit point, and the receiver will not sound after the short-circuit point.
3. find underground cable breakpoints The red clamp clamps the target line, the black clamp clamps all the remaining lines and then connects the ground rod to ground (good grounding is required), the receiver will sound before the break point, and the receiver will not sound after the break point.

Functions and instructions

Switch machine

Transmitter: Long press the launch switch key ” ” to tum on, at this time the transmitter LCD screen displays the initial interface, and the buzzer beeps twice at the same time.
Receiver: Long press the transmitter switch key” “to tum on, at this time the transmitter LCD screen displays the initial interface, and the buzzer sounds twice at the same time.

Set the transmission signal level (transmitter)

Short press the signal level setting key “ “, the signal level indicator flashes, short press the up and down keys “ ” to select the signal level (there are three levels I II II), short press “‘ ” to confirm and exit the signal level setting (transmit Signal level indication)

2.3 Set the transmit signal code (transmitter)

Short press the signal code setting key ” “, short press the up and down keys “ “to select the signal code, there are 6 types of signal codes, namely NC/E/F/ H/L, and then shortly press “ ” after selection “Confirm and exit code setting. (Signal code setting)

start/pause transmitting signal (transmitter)

Short press the start/pause button” “, the transmitter starts to emit high- frequency signals, and the screen emission status indicator lights up one by one. (Emission code setting, emission status indication, emission signal level indication)

Sensitivity mode setting (receiver)

• By default, it enters the automatic detection mode when it is turned on. Short press the mode switch key “ ” to switch between automatic sensitivity mode and manual sensitivity mode cyclically
• Automatic Sensitivity Mode: This mode adjusts the sensitivity to the maximum by default, which is suitable for quickly searching the approximate position of the target or using it in an environment with high depth.
• Manual sensitivity mode: This mode needs to manually adjust the sensitivity, enter the
• manual sensitivity mode, short press the up and down keys “.6′ T ” to adjust the sensitivity to the appropriate level (the sensitivity is divided into 8 levels). This mode is suitable for precise positioning. First use high sensitivity to quickly locate the approximate position, and then lower the sensitivity to accurately locate the target position.
  

Lighting function

Transmitter: Short press the transmitter lighting button “ ” to turn on the light, short press again to turn it off. Receiver: Short press the receiver lighting button ” ” to turn on the light, short press again to turn off.

Backlight function

Transmitter: Long press the transmitter backlight key “ ” to turn on the back: light, and press the backlight key again to turn off the backlight. Receiver: Short press the receiver backlight key “ ” to turn on the backlight, and press the backlight key again to turn off the back: light.

Transmitter voltage test function

If the transmitter is connected to a live line and the voltage is greater than 12V, the lower left part of the transmitter display shows the value of the current voltage, and standard symbols are used to distinguish whether it is AC or DC. At the same time, a lightning bolt with a triangular frame is displayed on the upper part of the display. Symbol recognition range is 12 ~ 400VDC/AC (AC: 50 ~ 60Hz)

Mute function

Transmitter: Short press the transmitter backlight/mute button “ “to turn off the sound, and press the backlight/mute button again “ “to turn on the sound.
Receiver: Short press the receiver mute button “ ” to turn off the sound, and press the receiver mute button ” ” again to turn on the sound.

Automatic shutdown function

Transmitter: In the state of not transmitting a signal, no button is pressed within 15minutes, the transmitter automatic shut-down. Receiver: If there is no button operation within 15 minutes, the receiver will automatically shut down.

NCV tester function (receiver)

Short press the receiver’s NCV button” ” to enter the electric tester function, the UAC indicator will light up on the screen; use the receiver probe to get close to the live cable, the receiver receives the signal, and emits a “di di” sound prompt, the closer you receive it The stronger the signal, the louder the sound.

Wiring specifications and methods

NF-826 Underground & In-Wall Cable Detector has the following wiring methods: unipolar application, bipolar application-connected to a live power grid, and bipolar application-connected to a non-live power grid.

Unipolar application

Unipolar application principle: The target wire is connected to the positive pole of the transmitter, and the negative pole of the transmitter is connected to the ground. At this time, the transmitter transmits a high-frequency signal to the target wire. After the signal passes through the conductor, it enters the air and returns to the ground, forming a closed loop, just like a radio transmitter. In the case of radio receivers, the specific wiring method is as follows. I Connect one end of the red cable to the positive port of the transmitter and the other end to the red alligator clip, and use the alligator clip to clamp the target line to be tested.
2. Connect one end of the black cable to the negative terminal of the transmitter, and the other end to the black alligator clip, and clamp the grounding rod with the alligator clip, and nail the grounding rod into the outdoor ground.

Bipolar application & live grid

Connect the positive jack of the transmitter to the target wire, and the negative jack of the transmitter to the neutral wire of the line under test. In this case, if there is no load* in the line, the high-frequency signal is coupled from the transmitter to the neutral line and returns to the transmitter through the distributed capacitance between the lines.
No load: No electrical appliances are connected

1. Connect one end of the red cable to the positive port of the transmitter, and connect the other end to the red alligator clip, and use the alligator clip to clamp the live target wire to be tested.
2. Connect one end of the black cable to the negative terminal of the transmitter and the other end to the black alligator clip, and use the alligator clip to clamp the neutral wire in the cable.
   

CAUTIONS

1. With this connection method, due to the mutual crosstalk of cable signals, the actual effective distance of this connection method is only 0.5m.

Method to eliminate signal crosstalk

1. Connect the negative return wire to other neutral wires through the cable reel, which can provide larger distance, so as to avoid crosstalk between the negative loop and the target wire signal.
2. Be careful of electric shock in accordance with safety regulations when wiring.

Bipolar application& unpowered grid:

Connect the positive jack of the transmitter to the target wire, and then connect the negative jack with another parallel wire of the circuit under test, and short the other two wires together. In this case, the high-frequency signal directly returns to the transmitter via the line. You can also connect the two connecting wires of the
transmitter to the two ends of the target wire respectively. You can also connect the positive jack of the transmitter to a terminal of the tested circuit, and then connect the negative jack of the transmitter to the ground terminal of the target wire.

CAUTIONS

1. Due to signal crosstalk, the actual effective detection distance of this connection method is only 0.5m)

CAUTIONS

1. Due to signal crosstalk, the target wire of this connection must be at least 2m away from the negative loop, otherwise the detection distance will be very short.)

CAUTIONS

1. Use this connection method to ensure that the ground wire in the line must be an effective ground wire, otherwise the detection distance will be very short.
2. The effective ground wire must be more than 2m away from the target wire, otherwise it will Crosstalk between signals occurs and the detection distance is reduced.)

Find the cable layout direction (the line must be uncharged)

The wiring method can choose unipolar application, bipolar application- uncharged wiring 3, these two connection methods, if possible, it is recommended to prefer unipolar application. If the target wire has multiple parallel wires, the other non-target wires ①② also need to be grounded, as shown in the figure:
Note: The negative pole of the instrument must be connected to a valid ground wire or ground, otherwise the detection distance will become very short.
Note: The negative pole of the instrument must be connected to a valid ground wire or ground, otherwise the detection distance will become very short.

Instrument operation method
Step 1: Follow the instructions to connect the wires and tum on the transmitter and receiver.
Step 2: Set the signal level to be sent, and select the appropriate signal level according to the depth of the cable buried. After setting, start sending high frequency signal.
Step 3: Set the receiver sensitivity mode. After the mode is selected, use the receiver probe to approach the wall or the ground where the target wire is located and move it slowly. When the receiver receives the signal, the receiving signal strength indicator on the screen lights up and sends out a “di di” Sound, the closer the receiver receives the stronger the signal, the louder the sound, and vice versa, the smaller.
Judgment method: by observing the signal received in the area detected by the receiver, the path with the strongest signal is the path laid by the target wire.

Find the cable break point (the line must be de-energized)

The wiring method can choose unipolar application, bipolar application- uncharged wiring 3, these two connection methods, 11 is recommended to prefer unipolar application if conditions permit. If the target wire has multiple parallel wires, the other non-target cables ①② also need to be grounded, as shown in the following figure:
Note: The negative pole of the instrument must be connected to a valid ground wire or earth, otherwise the detection distance will become very short.

Instrument operation method
Step 1 : Follow the instructions to connect the wires and tum on the transmitter and receiver.
Step   2: Set the signal level to be sent, and select the appropriate signal level according to the depth of the cable buried. After setting, start sending high frequency signal.
Step 3 : Set the receiver sensitivity mode. After selecting the mode, use the receiver probe to approach the wall or ground where the target wire is located and move it slowly. When the receiver receives the signal, the receiving signal strength indicator on the screen lights up and sends out a “di di” Sound, the closer the distance, the stronger the  signal received by the receiver, the louder the sound, and vice versa.
Operating skills: First adjust the receiver sensitivity mode to the automatic mode or manual mode high sensitivity gear, quickly determine the approximate location of the break-point, and then use the manual mode to lower the sensitivity gear to accurately locate the fault point. Judgment method: When the receiver probe detects a certain point along the target wire path, the received signal suddenly attenuates, and the received signal disappears a little farther away, then this point is the disconnection point of the target wire.

Find the short-circuit point of the cable (the line must be uncharged)

Knowing that line ①② is short-circuited, the wiring method can be bipolar application-uncharged wiring 1. If the target wire has multiple parallel wires, the other non-target cables also need to be connected to the negative pole of the reflector, as shown in the figure.

Step 1: Follow the instructions to connect the wires and turn on the transmitter
and receiver.
Step 2: Set the signal level to be sent, and select the appropriate signal level according
to the depth of the cable buried. After setting, start sending high frequency signal.
Step 3: Set the receiver sensitivity mode. After selecting the mode, use the receiver
probe to approach the wall or ground where the target wire is located and move it slowly. When the receiver receives the signal, the receiving signal strength indicator on the screen lights up and sends out a “di di” Sound, the closer the distance, the stronger the signal received by the receiver, the louder the sound, and vice versa
Operating skills: first adjust the receiver sensitivity mode to the automatic mode or
manual mode high sensitivity gear, quickly determine the approximate location of the break-point, and then use the manual mode to lower the sensitivity gear to accurately locate the fault point. Judgment method: When the receiver probe detects a certain point along the wire path of ①② , the received signal suddenly attenuates, and the received signal disappears a little farther away, then this point is the short-circuit point of the wire ①②.
Notice:

1. The short-circuit point of the short-circuit line can only be found if its resistance is less than 200. The short-circuit resistance can be measured with a multi-meter.
2. The short-circuit test must be known-a short-circuit line and connect it to the positive terminal of the transmitter, otherwise it cannot be tested.

Description of practical examples

Example of cable routing

Tracking underground lines
Prerequisites:

• The line to be tested must be uncharged;
• Connect the transmitter according to the single-pole application wiring method;
• Operate the instrument in accordance with the cable routing method;
• Find or track the line by observing the strength of the received signal of the receiver. The stronger the signal, the closer to the receiver.
  

CAUTIONS

1. The distance between the ground wire and the detection circuit should be as large as possible. If the distance is too small, the signal and line cannot be accurately located.
2. The detection depth is largely affected by the ground conditions. Choosing an appropriate receiving sensitivity can accurately locate the detection line.
3. The farther away from the transmitter, the weaker the signal strength and the lower the detection depth

Detect buried metal water pipes and metal heating pipes
Prerequisites:

• The pipeline must be made of metal materials (such as galvanized steel pipe);
• The pipeline to be detected cannot be the ground line, and there should be a large resistance between it and the soil (if the resistance is too small, the detection distance will be small);
• Connect the positive jack of the transmitter with the pipeline under test with a connecting wire, and connect the negative pole to the ground;
• Operate the instrument in accordance with the cable routing method;
• Find or track the line by observing the received signal strength of the receiver, the stronger the signal, the closer to the receiver;
• The metal water pipe laid by tracking is shown in Figure 4.1.2-1 and the heating pipeline is shown in Figure 4.1.2-2:
  

CAUTIONS

1. For safety reasons, turn off the power of electrical equipment.
2. Set the manual mode of the receiver and select the appropriate receiving sensitivity to accurately locate the pipeline.

CAUTIONS

1. There should be a certain distance between the ground terminal of the transmitter and the pipeline to be tested. If the distance is too small, the signal and line cannot be accurately measured position.
2. Set the manual mode of the receiver and select the appropriate receiving sensitivity to accurately locate the pipeline.

Detect user allocation of three-phase power supply lines on the
same floor
When detecting the user allocation of three-phase power supply lines on the same floor, please take the following steps:

• Disconnect the main switch in the distribution box of the floor;
• Remove the connection of the neutral line in the distribution box of this floor with the neutral line of other floors;
• Connect the positive pole of the transmitter to the three-phase electric phase line to be tested, and the negative pole to ground, as shown in Figure 4.1.3-1;
• Operate the instrument in accordance with the cable routing method;
• After setting up the transmitter, take the receiver to the air switch at the residence for detection. If the signal can be received, the residence circuit is connected to the test phase line, otherwise it is not.

CAUTIONS
For safety reasons, please be sure to cut off the power supply of the entire building so that it does not carry voltage.)

CAUTIONS

1. The ground terminal must be fully grounded, and the ground terminal of the transmitter must be at a certain distance from the line to-be tested. If the distance is too small, the signal and line cannot be accurately located.

Find the fuse corresponding to the line
In a multi-family building, use any socket Land N to connect to the transmitter (as shown in Figure 4.1.4-1), and set the transmitter’s transmit power to an appropriate level.
Prerequisites:

• Disconnect all air switches or leakage switches in the distribution box
• According to the bipolar application-non-energized connection method 3, connect the positive pole of the transmitter to the live wire of the socket, and the negative pole of the transmitter to the neutral wire (the accessory of this example uses a test pen, which is easy to plug into the socket) as shown in Figure 4.1.4-1 : Adopt manual sensitivity mode to reduce the receiver sensitivity to a suitable level, and detect near the air switch or leakage switch fuse.
  ****When connecting the transmitter with voltage, be sure to follow the safety instructions!

CAUTIONS

1. In the search process, the fuse with the strongest and most stable signal is the target to be searched. Since the signal will crosstalk to other lines, the receiver may also have a signal on other fuses, but the signal is relatively weak.
2. When detecting, it is best to place the probe of the detector at the inlet of the fuse box. This method has a better detection effect.

Example of finding cable break point:

Use two transmitters to find cable break-point failure
When there are many wiring harnesses and some of the wiring harnesses cannot be grounded, only one transmitter is used to connect a signal from one end of the line to find the line short-circuit fault. Due to the electric field crosstalk, only a rough location can be performed, and the open-circuit fault point cannot be accurately located . At this time, two transmitters can be used to connect signals from both ends of the line to find the fault point of the open circuit (the second transmitter needs to be ordered separately).
Methods as below:

• The circuit must be uncharged;
• According to the unipolar connection method, connect the positive pole of transmitter 1 to one end of the cable to be tested and the negative pole to ground; connect the positive pole of transmitter 2 to the other end of the cable to be tested, and the negative pole to ground. The remaining unused lines must Grounding as shown in Figure 4.2.1-1; Set the transmitter I signal code to F, and the transmitter 2 signal code to C(the signal code is not specific, just make sure that the transmitter I and transmitter 2 signal codes are inconsistent)
• Set the receiver sensitivity, and detect along the target cable path, observe the signal code received by the receiver, when the code changes from F to C or C to F, the detection area is the area where the open circuit fault is located. The receiver sensitivity can be reduced for precise positioning.
  

CAUTIONS

1. Adjust the transmitting power level of the transmitter to adapt to different detection radius.
2. Set the manual mode of the receiver, select the appropriate receiving sensitivity, and accurately locate the detection part.

****CAUTIONS

1. If you have only one spiral tube made of insulating material (such as a spiral tube made of glass fiber), we recommend that you insert a metal wire with a section of about 1.5mm into the insulated spiral tube first, and then put it together Push it into the plastic tube until it can no longer be pushed.

Classification or determination of the laid line

Prerequisites:

• The circuit must be without voltage;
• The ends of the core wires must be twisted to each other and can conduct electricity to each other;
• Connect the transmitter as shown in Figure 4.4-1;
• The measurement method is the same as the example.
  

CAUTIONS

1. If there is current in the cable, disconnect the power supply first to make it in a non-voltage state.
2. The ends of the core wires with the insulation layer removed must be conductive to each other, and the ends of the core wires with the insulation layer removed must be twisted with each other.
3. If there is only one transmitter available for use, it is necessary to perform multiple measurements by changing the connection between the transmitter and the core wire of the cable.

****HINTS

1. When changing the connection between the transmitter and the cable core, you can change the transmitter’s transmission code to distinguish different lines.
2. Adjust the transmitting power level of the transmitter to adapt to different detection radius.
3. If necessary, you can purchase transmitters with different transmitting signals.

Methods to improve the depth of detection

In bipolar applications, if the core wire in a multi-core cable is used as the return wire (such as NYM3xl.5mm2), the detection depth will be greatly limited. The reason is that the feeder and the loop are very close, which causes serious distortion of the magnetic field. It is not possible to establish a sufficiently strong magnetic field in the narrow part. If a separate loop is used, this problem will be easily resolved. A separate conductor allows the magnetic field to spread more strongly. The return wire can be any wire or cable reel. It is important that the distance between the feeder line and the return line is greater than the buried depth. In actual work, it is often 2 meters or more.
Prerequisites:

• The circuit must be without voltage;
• Connect the transmitter as shown in Figure 5 .1-1;
• The distance between the feeder line and the return line must be at least 2 to 2.5 meters or more;
• The measurement method is the same as the example.
  
  Note: The maximum detection range of this wiring method is 2m

Methods to improve the effective radius of the live line search

When the transmitter is directly connected to the phase line and the neutral line, the signal is conducted on two parallel lines (as shown in Figure 5.2-1 ).
The twisting of the lines can sometimes cause the signals to cancel each other. The effective radius in this case The maximum is only 0.5 meters. In order to eliminate this effect, the wiring should be as shown in Figure 5.2-2. A separate cable is used for the return line, which can increase the effective radius to 2.5 meters or higher. A larger distance return line can be provided through the cable reel. (See Figure 5.2-2).

CAUTIONS
When connecting the transmitter with voltage, be sure to follow the safety instructions!
HINTS
Pay attention to the distance between the receiver and the line to be checked, so that the line can be clearly determined by the signal.
Note: The maximum detection range of this detection method is 0.5m
Note: The maximum detection range of this detection method is 2.5m

Technical parameters

AC 12~400V(50~60Hz) +2.5%
Display| LCD, with function display and column chart
External voltage’s dielectric strength| Max. 400V AC/DC
Overvoltage type| CAT III 300V
pollution degree| 2
Power supply| 3. 7V 1400 1nAh Lithium battary
Power consumption| MIN current| 80mA
MAX current| 001nA
Fuse| F 0.5 A 500V,6.3×32 1n1n
Range of
Temperature| In work| 0°C ~ 40 °C, with maximun1 relative hu1nidity of 80% (non-condensation)
In storage| -20°C ~ 60°C,with maxitnum relative humidity of 80% (non- condensation)
Altitude| Max. 2000m
Dimensions (HxW*D)| 156 x 80 x32 mm
Weight| 235g with battary
Technical parameters of receiver| __

Depth of tracking

| The depth of tracking depends on the material and specifications
---|---|---
Cable locating mode| Single pole application| About0~lm
Dual-pole application| About 0-0.5m
Single loop line| Upto2.5m
Grid voltage identification| About CNJ.4m
Display| LCD, with function display and column chart
Power supply| 3.7V 1400 mAh Lithium battary
Power consumption| MIN current| IO0mA
MAX current| 300mA
__

Range of temperature

| In work| 0°C ~ 40°C,with maximum relative humidity of 80% (non-condensation)
In storage| -20°C ~ +60°C,with maximum relative humidity of 80% (non- condensation)
Altitude| Max. 2000m
Dimensions (HxWxD)| 226 X 73 x29 nun
Weight| 235g with battary

Repair and maintenance

1. If the detector is suspected of malfunctioning, please confirm that the electrical amperage of the battery is sufficient and the test lead is not broken.
2. Before sending back the detector for repair, please dismantle the battery and describe the phenomenon of malfunction,and then properly pack the apparatus to avoid damaging 1t during transportat10n. For damages caused during transportation, the company would assume no responsibility.
3. There is a fuse within the transmitter. Ifit is damaged during the guarantee period, it can only be replaced by technical personnel of the company. Ifit is damaged after the guarantee period, please replace it with a fuse of the same model by yourself. This fuse is single metal wire fast-melting type, so do not replace it with a helical metal wire of delayed type, otherwise the transmitting power and safety of apparatus cannot be guaranteed.

Troubleshooting

If the detector does not work properly, please check the items in the table below:

batteries
Is the electrical amperage of the battery too low?
Is the polarity of the battery

correct?

| Check the polarity
Transmitter cannot identify external voltage| Is the contact sound?| Reconnec t the line
ls the probe broken?| Replace the probe
Has the probe been inserted to the bottom?| Properly insert the probe
Is the test lead broken?| Replace the test lead
Has the test lead been inserted to the bottom?| Property insert the test lead
Power supply is cut off during measunng| ls the electrical amperage of battery sufficient?| Replace the battery
Did the machine automatically tum off?| Tum on the machine again
The transmitter cannot receive the signals transmitted by itself| Has the transmission button been pressed’?| Trans mit again
Is the fuse of transmitter broken?| Send it back to a closest service center

Checking of the fuse of the transmitter

The fuse of the transmitter can prevent the transmitter from being damaged by overload or wrong operations. If the fuse in the transmitter has already been melted down, the transmitter can only transmit weak signals. If the self-check of transmitter is passed but the signal transmitted is weak, it means that the transmission is sound but the fuse has been melted down. If no signal is found during the transmission status self-check of the transmitter, and the voltage of battery is normal, it means that the transmitter is broken and should be repaired by special technicians.
Specific methods and steps to check the fuse of the transmitter:

1. Break all the measuring circuits of the transmitter;
2. Turn on the transmitter and put it in the transmitting status;
3. Set the transmitting power of transmitter to level I:
4. Connect one end of the test lead to the joint@ofthe transmitter;
5. Insert the other end oftest lead into the connecting socket of the transmitter;
6. Turn on the transmitter to search for the signals from the test lead, and move the probe of the receiver towards the test lead;
7. If the fuse is not broken, the value displayed on the receiver will be doubled.

Cleaning

Use a rag dipped with clean water or neutral detergent to wipe the transmitter, and then use a dry rag to wipe it again.

CAUTIONS

1. Before cleaning work, please make sure that the equipment has been turned off, and all the circuits have been cut off.
2. During cleaning work, please do not use benzene, alcohol, acetone, ether, ketone, thinner or gasoline, which would make the equipment deformed or decolored.
3. After cleaning, use the equipment again when it is completely dry.

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