Safety Instruction, Warnings and Notes
200VW8 LCD
21
Safety instruction, warnings and notes
index of this chapter: 1 Safety Instructions 2 Warnings
3 Notes
1 Safety Instructions
Safety regulations require that during a repair:
a. Connect the set to the AC Power via an isolation transformer (> 800 VA).
b. Replace safety components, indicated by the symbol 
, only by components identical to the original ones. Any other component substitution (other than original type) may increase risk of fire or electrical shock hazard.
Safety regulations require that after a repair, the set must be returned in its original condition. Pay in particular attention to the following points:
a. Route the wire trees correctly and fix them with the mounted cable clamps.
b. Check the insulation of the AC Power lead for external damage.
c. Check the strain relief of the AC Power cord for proper function.
d. 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):
*Unplug the AC Power cord and connect a wire between the two pins of the AC Power plug.
*Set the AC Power switch to the "on" position (keep the AC Power cord unplugged!).
*Measure the resistance value between the pins of the AC Power plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 Mohm and 12 Mohm.
*Switch "off" the set, and remove the wire between the two
Pins of the AC Power plug.
e. Check the cabinet for defects, to avoid touching of any inner parts by the customer.
2 Warnings
a. 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.
b. Be careful during measurements in the high voltage section. c. Never replace modules or other components while the unit
is switched "on".
d. 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.
3Notes 3.1 General
Measure the voltages and waveforms with regard to the chassis ground or hot ground, depending on the tested area of circuitry. The voltages and waveforms shown in the diagrams are indicative.
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
3.2 Schematic Notes
All resistor values are in ohms and the value multiplier is often used to indicate the decimal point location (e.g. 2K2 indicates 2.2 Kohm).
Resistor values with no multiplier may be indicated with either an "E" or an "R" (e.g. 220E or 220R indicates 220 ohm).
All capacitor values are given in
Capacitor values may also use the value multiplier as the decimal point indication (e.g. 2p2 indicates 2.2 pF).
An "asterisk" (*) indicates component usage varies. Refer to the diversity tables for the correct values.
The correct component values are listed in the Electrical Replacement Parts List. Therefore, always check this list when there is any doubt.
3.3 Lead Free Solder
Philips CE is going to produce
This sign normally has a diameter of 6 mm, but if there is less space on a board also 3 mm is possible.
In case of doubt wether the board is
*Always use the highest temperature to solder, when using SAC305 (see also instructions below).
*
Caution: For
For additional questions please contact your local repair desk.
Due to
Use only
In general, use of solder paste within workshops should be avoided because paste is not easy to store and to handle.
Use only adequate solder tools applicable for
-To reach at least a
-To stabilise the adjusted temperature at the
-To exchange