Bosch EX49N Installation Instructions Manual page 32

Poor
Picture
Snowy
Image
(cont'd.)
Horizontal
Scan Lines,
Rolling Up or
Down
Negative,
scrambled,
or faded
image
Halo Effect
Noisy Power Supply
Ground Looping on
video cable
Low voltage
The Lens Foam Ring
(Donut) is not
touching the inside
of the dome.
25
Check connections.
Relocate or replace
the power supply.
Check the coax
cable shield is not
touching ground,
e.g. at couplings.
Check video
polarity.
Check voltage at
the input power
cable.
Must be >10.5V dc
or >12V ac.
Make sure the
Foam Ring touches
the domes' inside
surface.