Anritsu RA725UA, Instruction Manual, Page: 36 / 75

SECTION
4 MAINTENANCE
INSPECTION
Problems
may occur if
dirt or
dust accumulate on
the densely-mounted components
on
the PC
boards. Clean off any dust with an electric
vacuum cleaner, etc., or a
soft cloth,
Check the tightness of
all
PC
board
connectors.
If there is any dirt on the connectors or any poor
contact,
brush
it
with
a
piece of plastic
or
wood
material or replace the connector. Polishing with
metal materials causes
Do not use liq-
uid contact reviver because it attracts dirt.
Period
3
to 6
months
6
to 12
months
Inspection Location
Scanner mountings
Inside scanner
unit
.
Display
surface
Antenna drive gear lubrication
CRT H V
parts
PC
boards
Bolts and scanner motor brushes
Procedure
Check that the scanner mounting
bolts
are tigh
t
and that there is no corrosion.
Open the scanner cover and check the tightness
of
the bolts and the mounting condition of each
part..
Check the tightness of any packing and thai
there is no cor
rosion on any metal parts.
Clean the
filter
and CRT with a damp soft cloth.
Check that the antenna drive gear is properly
Clean
the anode
cap
and its vicinity as well as
HV
lead with a dry cloth. The
CRT
has
voltage
of more than 10
kV, cut the power
to
display unit
and
discharge any residual voltages in the dis-
play before cleaning the HV parts.
Check that all fabrication and mounting screws
in the equipment are tight. If the scanner motor
brushes are worn to less than 6
mm
long, replace
them (14
mm
long when new).