42
Poor
Picture
Quality
Snowy
Image
(cont’d.)
Horizontal
Scan Lines,
Rolling Up
or Down
Negative,
scrambled,
or faded
image
Noisy Power
Supply
Ground Looping on
video cable
24V ac operation
Low voltage
Check connections.
Relocate or replace
power supply.
Check the coax cable
shield is not touching
ground, e.g. at
couplings.
An electrically
isolated circuit board
or isolation
transformer may be
required.
Line Lock adjustment
required.
Check voltage at
input power cable.
Must be >10.5V dc or
>12V ac.