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4-2
MAINTENANCE
Orban Model
464A
Routine
Maintenance
No
routine
maintenance of
this
product
is
required.
See
Section
3 for
information about
calibrating the
PEAK output LEVEL
meters
to
the
overload
point
of
the
device being
driven.
Getting
Inside
the Chassis
To
access the
circuit
boards,
remove
all
screws holding
the appropriate
cover
in place,
then
lift
that
cover
off.
Remove
the top
cover
for access
to
the rear
of
the front-panel
circuit
board
or the
jumpers on
the
component
side
of
the
main
circuit
board.
Remove
the
bottom cover
for access
to
the solder side
of
the
main
circuit
board.
When
replacing the covers, replace
all
screws snugly
(be careful not
to
strip
the
threads
by
fastening the
screws
too
tightly).
To
get
at
the front
of
the front-panel
circuit
board,
remove
the top cover,
remove
the
four
screws
that attach the
board
to
the front panel,
then
carefully
tilt
the
board back
and down.
DO NOT
attempt
to
remove
the front-panel
board
from
the chassis
—
it
is
hard-wired
to
the
main
circuit
board.
When
replacing the front-panel
circuit
board,
be
sure
that
the insulating
paper beneath
the
right
channel
pots
is
in place.
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