Philips VS23605T - ESD Precautions

It is recommended to have a maintenance
inspection carried out periodically by a qualified
service employee. The interval depends on the
usage conditions.
- When the set is used in a living room the
recommended interval is 3 to 5 years.
- When the set is used in the kitchen or garage this
interval is 1 year.
During the maintenance inspection the above mentioned
"safety instructions for repair” should be carried out.
The power supply and deflection circuitry on the
chassis, the CRT panel and the neck of the CRT should
be cleaned.
Warnings
1.When a camera or accessory is connected or
disconnected, the monitor should always be switched
off by the power switch (at the rear side of the
monitor). Only operating the stand-by knob is not
sufficient !
2.In order to prevent damage to ICs and transistors, all
high-voltage flash-overs must be avoided.
In order to prevent damage to the picture tube, the
method shown in Fig. 3.1 should be used to discharge
the picture tube. Use a high-voltage probe and a
multimeter (position DC-V). Discharge until the meter
reading is 0 V (after approx. 30s).
CL 26532098/042
140792
Fig. 3.1
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3.ESD Ald
All ICs and many other semiconductors are sensitive to
electrostatic discharges (ESD).
Careless handling during repair can drastically shorten
the life. Make sure that during repair you are connected
by a pulse band with resistance to the same potential
as the earth of the unit.
Keep components and tools also at this same potential.
4. Be careful when taking measurements in the high-
voltage section and on the picture tube panel.
5.When making settings, use plastic rather than metal
tools.
This will prevent any short-circuit and the possibility of
false made adjustments
VIM6
6.Never replace modules or other components while
the unit is switched on (pull-out the mains cord to
switch-off the monitor).
7.After repair the wiring should be fastened once
more in the cable clamps for this purpose.
8.It is necessary to connect first the cameras to
the camera inputs, before switching on the
monitor. In this way you can prevent short circuit of
camera input during camera connection and
therefore prevent damaging of input transistor.
9.When no input signals are connected to the
monitor, the screen will be blanked.
Notes
1.The direct voltages and oscillograms are average
voltages. They have been measured by using a
camera with a random picture and under the
following conditions:
- Adjust brightness and contrast control for the
mechanical mid-position;
- Volume control in middle position.
2. The semiconductors indicated in the circuit
diagram(s) and in the parts lists are completely
interchangeable per position with the
semiconductors in the unit, irrespective of the type
indication on these semiconductors.
3.Diagram notes;
The circuit diagrams are prepared for different
types of system monitors. On each diagram
symbols may be add to components to identify for
which type of monitor that component is available
in the diagram.
PCS 97 061 GB
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