SECTION
V
MAINTENANCE
5-1.
ROUTINE
MAINTENANCE
Routine cleaning of the printed
circuit
board
and
connector
contacts
is
not necessary.
In
case of
intermittent
operation, however,
clean the contacts
by
spraying with
an
aerosal contact
cleaner.
Do
not
use a cleaner with abrasives.
To
work
grime
free,
polish the contacts
lightly
with a
soft
pencil
eraser.
Be
sure the
power
is
disconnected.
Accumulated dust should
be
cleaned out of the chassis with a
soft
brush. Fingerprints
and
smudges
can
be
removed
from
the chassis
with a cloth moistened with a household
ammonia
solution.
At
least
quarterly,
the performance of the
electronics
should
be
checked
and
compared
with the Acceptance Test Results supplied
by
Broadcast Electronics with
each
Series
3000
unit.
5-2.
EXTENDER
BOARD
As
an
aid in troubleshooting the plug-in modules, the optional
919-1504
extender board
is
available.
This accessory
raises
any
module
approximately 3 inches
above
the
chassis.
5-3.
COMPONENT
REPLACEMENT
ON
PRINTED
CIRCUIT
BOARDS
AC
POWER
MUST
BE
TURNED
OFF
WHEN
PRINTED
CIRCUIT
BOARDS
ARE
REMOVED
OR
REPLACED.
Great care should
be
exercised
when
working
on
printed
circuit
boards, since excessive
head
may
cause the
foil
to peel
off.
The
Broadcast
Electronics warranty
on
printed
circuit
boards
is
void
if
boards are
damaged
by
improper handling.
When
replacing
components
on
a
printed
circuit
board, use a
small soldering iron
(15
to
30
watts with a small
tip).
Use
a brush or
desoldering tool to
remove
excess
solder.
Protect
the board contacts with
masking
tape
and
mount
gently in a small
vise.
Touch
the iron to the connection to
be
unsoldered.
When
heated,
quickly
remove
the iron
and
brush
away
the excess
solder.
Be
careful
that
no
solder
splatters
onto the board.
Unbend
the leads with a small
pair
of
needle nose
or
diagonal
cutting
pliers
and
remove
the component.
23
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