一线通（Line pass）.docVIP

一线通（Line pass） Common problems and solutions during the debugging of common cable monitoring Release time: 2012.06.16 news source: Universal fly technology visits: 72 Common cable monitoring line in the debugging process of common problems and solutions, hoping to help our customers! 1, the image has snowflake point Reason: low level Solution: add a signal amplifier on the line to raise the signal level to the front level. 2, the image has ghosting Reason: 1, the system impedance does not match, 2, the common cable front equipment grounding is bad, 3, branch counter Solution: if there is a vacant 1. check insertion end line, the vacant end screw on the 75 head end resistance; check the transmitter output interface 2. connection is good, or replace the transmitter; 3. view IN and OUT bifurcation is whether the reverse. 3. Having a moving, vertical, or slanted, or netlike, broad, black-and-white stripe Reasons: 1., the output level between adjacent channels is too large; 2., the main control room frequency shift and output level changes. Solution: 1. to the front, turn the blue knob on the transmitter clockwise; 2., frequency trimming on the receiver. 4, the image appears up and down moving horizontal pattern, or appear a white line, Reason: the power ripple factor becomes larger, usually the DC regulated power supply filter capacitor is deteriorated Solution: 1., replace the front-end equipment of the power supply; 2., if all images appear, then replace the signal amplifier DC regulated power supply. 5, the image of mesh interference, or appear 0.5 mm wide oblique white bar or horizontal white bar Reason: same frequency interference Solution: 1. change the equipment channel of the interference monitoring point; 2. adjust the output level; 3. adjust the device position. 6, image distortion, Reason: the level of the common cable input signal is too high Solution: to reduce the output level of the front-end, if it has been reduced to the minimum, access the attenuator o