Philips 32FD9944/01S, Руководство по обслуживанию

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Safety Instructions, Warnings and Notes EN 5 FM24 2.
2. Safety Instructions, Warnings and Notes
2.1 Safety Instructions
Safety regulations require that during a repair:
•
Connect the set to the mains via an isolation transformer (=
800 VA).
• Do not operate the monitor without the front glass plate.
One function of this glass plate is to absorb IR radiation.
Without this glass plate, the level of radiation could
damage your eyes.
• Replace safety components, indicated by the symbol ,
only by components identical to the original ones.
Safety regulations require that after a repair, the set must be
returned in its original condition. Pay, in particular, attention to
the following points:
•
Route the wire trees correctly and fix them with the
mounted cable clamps.
• Check the insulation of the mains lead for external
damage.
• Check the electrical DC resistance between the mains plug
and the secondary side (only for sets which have a mains
isolated power supply):
1.
Unplug the mains cord and connect a wire between the
two pins of the mains plug.
2. Set the mains switch to the 'on' position (keep the
mains cord unplugged!).
3. Measure the resistance value between the pins of the
mains plug and the metal shielding of the tuner or the
aerial connection on the set. The reading should be
between 4.5 M
Ω
and 12 M
Ω
.
4. Switch 'off' the set, and remove the wire between the
two pins of the mains plug.
• Check the cabinet for defects, to avoid touching of any
inner parts by the customer.
2.2 Warnings
• All ICs and many other semiconductors are susceptible to
electrostatic discharges (ESD
"
). Careless handling
during repair can reduce life drastically. Make sure that,
during repair, you are connected with the same potential as
the mass of the set by a wristband with resistance. Keep
components and tools also at this same potential.
Available ESD protection equipment:
–
Complete kit ESD3 (small tablemat, wristband,
connection box, extension cable and earth cable) 4822
310 10671.
– Wristband tester 4822 344 13999.
• Be careful during measurements in the high voltage
section.
• Never replace modules or other components while the unit
is switched 'on'.
• When you align the set, use plastic rather than metal tools.
This will prevent any short circuits and the danger of a
circuit becoming unstable.
2.3 Notes
• Clean the glass plate in front of the plasma display with a
slightly humid cloth. If, due to circumstances, there is some
dirt between the glass plate and the plasma display, this
must be cleaned by a qualified service engineer (see
chapter 4).
• Measure the direct voltages and oscillograms with regard
to the chassis ground (
,
), or hot ground (
-
) as this is
called.
• The direct voltages and oscillograms shown in the
diagrams are indicative. Measure them in the Service
Default Mode (see chapter 5).
• Where necessary, measure the voltages in the power
supply section both in normal operation (
+
) and in standby
(
/
). These values are indicated by means of the
appropriate symbols.
• The semiconductors indicated in the circuit diagram and in
the parts lists, are interchangeable per position with the
semiconductors in the unit, irrespective of the type
indication on these semiconductors
www.freeservicemanuals.info 31/8/2014
Digitized in Heiloo, Holland