Possible reasons: 4 main line and other signal lines have short circuit, or extension of the bad. Processing method: check the host of the main line with the other 4 signal lines have a short circuit, or to replace the extension test.
Date:
2016
-
08
-
12
Views：5
reatment method:The inspection system whether the interference source, the audio line is connected;?The check intercom host and extension is faulty, the host may be a problem with the head;* Note: strictly in accordance with the relevant provisions of the weak current system, and according to the requirements of the system specification wiring, far away from the strong electricity, it is best to use the shielded wire.
Date:
2016
-
08
-
12
Views：6
May cause a short circuit fault or sewing.Processing method: check the host to the electrically controlled lock circuit is short circuit or broken.
Date:
2016
-
08
-
12
Views：7
Possible reasons: the host to the extension of the line has a short circuit or fault. Processing method: check the host machine to the extension of the 1 line if there is a short circuit or broken.
Date:
2016
-
08
-
12
Views：6
Possible reasons: the extension of the voice adjustment is not in place. Methods: regulation extension volume, it (Note: the wire is in line with the standard)
Date:
2016
-
08
-
12
Views：4
Possible reasons: the extension of the 18V power supply is normal, there is no short circuit or fault line. Processing method: check the extension 18V power supply and the voltage is normal, the host and the extension of the 3.4 line is short circuit and fault.
Date:
2016
-
08
-
12
Views：7