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Possible reasons: short circuitProcessing method: please don't answer the main testing trunk extension a (single) if there is a short circuit.
Date: 2014 - 11 - 15
Views:107
Two possible reasons: check the power indicator is on,Connected to the host power supply is wrong, or if there is a short circuit;Processing method: two power supply is not electricity, wouldn't light properly connected the power cord; Insurance on the 220 input line pipe and burn out, need to change.First detection talkback host and its surrounding wiring, then test the power and the surrounding wiring; The last detecting various indoor extension and surrounding wiring.
Date: 2014 - 11 - 15
Views:104
Possible reasons: the signal is too weak, impedance mismatch or contrastProcessing method:With extension on the back of the 75 ohm impedance short circuit blockCan increase the video on trunk amplifier equipment.Does the contrast, brightness is bad, the adjustable potentiometer improve image effect.
Date: 2016 - 08 - 11
Views:6
Possible reasons: the voltage is not enough;Methods: to check the extension, whether visual power to 18 v.Possible reasons: image signal weak lead to line out of sync; Processing method: check whether the video line contact is good, the extension to the power distance is too far away, if the power cord standard.?
Date: 2016 - 08 - 11
Views:4
Possible reasons: to check whether the wrong 18 v visual power supply will be received the door machine, lead to camera overheating;Methods: the correct connection.
Date: 2016 - 08 - 11
Views:5
Possible reasons: the power supply is not stable;Processing method: test system power supply, look to whether stable, adequatePossible reasons: extension problem;Processing method: check the extension of the contrast and brightness adjustment.Possible reasons: the video signal is not stable;Methods: using the multimeter, signal detection system, look to whether stable, adequate; Special circumstances building visual intercom system used alone video distribution amplifier, please view the video distribution amplifier regulator, whether regulation is normal.
Date: 2016 - 08 - 11
Views:6
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