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Service Aids; Laser Product; Information About Lead.free Soldering - Philips CEM250X/78 Service Manual

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1-4
SERVICE AIDS
@
wARNTNG
All
lCs
and
many other
semi-conductors
are
susceptible
to electrostatic discharges
(ESD).
Careless handling during repair can
reduce
life
drastically.
When repairing,
make sure
that
you are
connected
with
the same
potential
as
the
mass
of the set
via
a
wrist
wrap
with
resistance.
Keep
components
and
tools also
at
this
potential.
Safety
regulations
require that the set be restored
to
its
original
condition and
that
parts which
are
identical with those specified,
be used
Safety components
are
marked by the
symbol^A,.
Route the wire trees correctly and fix them with the
mounted cable clamps.
Check the insulation
of
the AC Power lead for external
damage.
Check the strain relief
of
the
AC
Power cord for proper
function.
Check the electrical DC resistance between the
AC
Power
Plug and the secondary side (only for sets which have a AC
Power isolated power supply):
CLASS
1
LASER PRODUCT
1
.
Unplug the
AC
Power cord and connect
a
wire
between the two pins of the AC Power plug.
2.
Set the AC Power switch to the "on" position (keep the
AC Power cord unplugged!).
3.
Measure the resistance value between the pins of the
AC Power plug and the metal shielding
ol
the tuner
or
the aerial connection on the set. The reading should
be
larger than 4.5 Mohm (For U.S.
it
should be between
4.2 Mohm
and
12 Mohm).
4.
Switch "off" the set, and remove the
wire
between the
two pins
of
the AC Power plug.
o
Check the cabinet for defects, to avoid touching of any
inner parts by the customer.
ESD
)
IAr
INFORMATION ABOUT LEAD.FREE SOLDERING
Philips CE
is
producing lead-free sets
from
1.1.2005 onwards.
IDENTIF!CATION:
Regardless of special logo (not always indicated) one must treat all sets from
F-JEiZdIElonrards,
according next rules:
.
On our website
you find more information to:
*
BGA-de-/soldering (+ baking instructions)
+
Heating-profiles of BGAs and
other
lCs used in Philips-sets
*
Lead free
You will find ihis and more technical information within the "magazine", chapter "workshop news".
For
additional questions please contact your local repair-helpdesk.
SERVIGE INSTRUCTION
Salety regulations require that after a repair, the set must be returned in
its
original condition. Pay in particular attention to
the following points:

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This manual is also suitable for:

Cem250/55Cem250/98