SECTION
4
MAINTENANCE
AND
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
corrosion.
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
HV
parts
PC
boards
Connectors
Bolts
and scanner motor brushes
Procedure
Check that the scanner mounting
bolts
are tight
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 corrosion
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).
28
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