FAQ
First, the host button no effect:
A check the system power supply is normal, the voltage and current can meet the system requirements, the normal DC13.4-15V range, the power line is too thin transmission distance, the system load is too large will cause the low voltage so that the host can not normal work.
B will host the main line, network cable, video cable dial, leaving only the power cord, such as the host is normal that the host itself is basically normal, please check other equipment and lines.
C test the host to the decoder of the various ports of the normal voltage and signal, compared with the normal when the use of sub-replacement to find the point of failure.
 
Second, the host does not call any extension or call disconnection:
A check the main line of the output port signal, voltage;
B check the host code is correct whether there is a re-code phenomenon, with particular attention to the factory automatically corresponds to the code and the subsequent modification of the code re-occurrence phenomenon;
C Check that the trunk connection is correct;
D wire diameter is consistent with system requirements, whether the quality of wire itself;
E whether the main equipment is damaged;
F line long or farthest extension call on the broken line, can call but no intercom is obviously due to lack of power supply.
 
Third, troubleshooting methods and points:
A to be troubleshooting First of all, to fully understand the system, such as system operating voltage, current, signal control. The output of the port, set the programming, the number of reasonable configuration, transmission, transmission distance, transmission environment, equipment, use the environment, installation standards, wiring technology and supporting the use of equipment and equipment technical requirements;
B reasonable troubleshooting methods, will greatly improve the maintenance efficiency, generally take the sub-section, grading, replacement, narrow range, the scope of the failure to narrow and determine a device above, so that the normal use of equipment, and then troubleshooting. In the exclusion process, the important equipment, the only equipment must ensure that is good, and then look out, with particular attention to the system parameter settings, fault phenomena are irregular, time. Are all or individual;
C analysis to a comprehensive, repeat the fault to find out the reasons, there must be corrective measures to prevent the maintenance process if any questions in time to ensure that the system to normal operation.
 
Fourth, with the lock-related failure:
A first to check the unlock signal control mode, the electric lock their work, supply voltage, current, wiring is correct, the choice of electric locks and power supply can be used;
B check the system is individual can not unlock or all can not be unlocked, the whole unit can not be unlocked Please check the main line to unlock the signal line voltage can be segmented test until a fault point, a layer can not be unlocked Please check the layer decoder, Way to determine. A household can not unlock Please check the decoder to the extension line and the station extension key, can be confirmed by replacement;
C system has a variety of unlocking methods, such as: host password unlock, call extension unlock, call center management machine unlock, IC card card lock, these methods are invalid, then the public or supporting problems. Please check the following points separately:
① each time unlock the host unlock signal output port whether there is an instant DC2-12V voltage output, (due to the reaction quickly with a pointer multimeter dial to DC10V file measurement) that the host output before all the equipment is good Please check the next step;
② check whether the system power supply to receive the host unlock signal, after receiving the power supply itself, whether the voltage output to the electronic control lock;
③ check the electric lock itself or not quality problems;
④ check the electric lock diameter can meet the electric lock work requirements;
⑤ check and go out button, supporting the connection between the access is correct, whether there is a conflict between the circumstances necessary to disconnect the test alone.
D All users can not unlock
Possible reasons: check the door machine to power, door machine to the electrical lock is connected. Check whether the lock line is connected (straight type system line 2, digital line 3);
Processing method: according to the wiring diagram correctly connected to the transmission line can use the password to unlock the way to unlock, if you can open the electric lock, to prove that the door machine to the electric lock channel no problem to check the main line to the decoder line households can not unlock.
Part E users can not unlock
Possible reasons: check the lock line with no wrong or bad contact (digital system: extension to the decoder line 3; straight type: check the extension to the door machine line 2) and the extension itself is normal;
Treatment: replace the way for a good machine to see if it is normal, if not normal, check the wiring is wrong.
 
Fifth, the image of the exclusion method:
A image ghosting
① check the transmission impedance, in each branch of the last one to plug 75Ω balance resistor, the system installed in the middle of the video amplifier, access to the amplifier in front of a distributor also need to add 75Ω balance resistance, otherwise it will cause the video Ghosting phenomenon
② multiple branch video cable back together must increase the video distributor, can not be arbitrarily twisted together;
③ to ensure that the video connector is solid, there can be no contact with the phenomenon;
④ signal is too weak, transmission distance, the use of wire does not meet the standards, will produce ghosting.
B image beating:
Check the video power output to the extension voltage, the current can meet the power generated by the extension, the visual extension with DC18V power supply, the current between 600 ~ 800mm A, with the wire diameter and the selected power supply power calculation.
C has snowflakes
Possible reasons: check whether the wrong 18V visual power supply to the door machine, causing the camera overheating;
Remedy: Wrong wiring.
D image dissatisfied screen, there are dark corners
Possible reason: whether the visual power supply on the extension is 18 +/- 1V;
Solution: whether the extension to the power supply distance is too far, whether the standard power cord.
E image dissatisfaction screen, there are dark corners
Possible reason: the image signal is weak to cause the line to be out of sync;
Solution: check the video line contact is good, the transmission distance is too far, whether the standard line
F image is blurred and dim
Possible cause: the signal is too weak, the impedance does not match or the contrast is not good;
Approach:
a) adjust the back of the extension 75 ohm impedance switch;
b) contrast, brightness is not good, adjustable potentiometer to improve the image effect;
G Visual extension with grating No image:
Possible reasons: the entire building visual extension no image, check the door video output V to a video distributor input wiring is negative and then connected, the video distributor is connected to the power supply, pay attention to the input and output ports can not be wrong ;
Solution: Connect the video splitter to the input and output video cable.
 
Six, the system does not work
A The whole system does not work
Possible cause: Check whether the power indicator light is on; whether the power supply connected to the host or video distributor is wrong or if there is a short circuit;
Treatment: power two lights do not shine is not power, the correct access to the power cord; or connected to the 220 input line fuse burned, need to be replaced.
B can call intercom, but no video;
Possible reasons: check the power to the indoor unit of the 18V video power through the circuit with or without wrong;
Treatment: the correct access to power --- video distributor - indoor power lines.
C can not call intercom, video can be opened but no image;
Possible reasons: check the power supply with or without 12V output, the door machine whether there are 12V intercom power input;
Solution: If there is no 12V output, replace the power control panel on the fuse, or replace the power; the correct access to the power supply to the door between the power cord;
D call no ringing, but there are video images that can talk;
Possible reasons: check the door machine to the extension of the No. 1 line is connected, and the extension itself is normal, the handset is linked to good;
Treatment method: replace a good extension to see if it is normal; if not normal, check the wiring is correct;
E input a residential floor number, room number, the host has a ring back, but the corresponding extension does not ring the video extension without grating no image;
Possible reasons: Decoder floor number is not compiled, the decoder on the terminal and the corresponding room number does not correspond;
Processing method: according to the instructions made by the decoder floor number, and distinguish between the good decoder on behalf of the terminal number; the cable is properly inserted.
 
Seven, call problems
A All user extensions can not talk:
Possible reasons: check the door machine to the decoder and decoder to the user extension audio cable is wrong and connected;
Remedy: Connect the transmission line correctly according to the wiring diagram.
B a user extension can not talk:
Possible reason: decoder output port to the user extension audio cable is wrong;
Remedy: Connect the transmission line correctly according to the wiring diagram.
Possible reasons: check the door machine to the decoder and decoder to the user extension audio cable is wrong and connected;
Remedy: Connect the transmission line correctly according to the wiring diagram.
Possible reasons: check whether the system has interference sources, audio cable is connected;
Solution: correct wiring, or replace a power supply try.
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