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2. Safety & Maintenance Instructions, Warnings, and Notes
2.1 Safety Instructions For Repairs
Safety regulations require that during a repair:
• Due to the 'hot' parts of this chassis, the set must be connected to the AC power via an isolation transformer.
• Safety components, indicated by the symbol _, should be replaced by components identical to the original ones.
• When replacing the CRT, safety goggles must be worn. Safety regulations require that after a repair, the set must
be returned in its original condition. Pay particular attention to the following points:
• General repair instruction: as a strict precaution, we advise you to re-solder the solder connections through
which the horizontal deflection current is flowing, in particular:
– All pins of the line output transformer (LOT)
– Fly-back capacitor(s)
– S-correction capacitor(s)
– Line output transistor
– Pins of the connector with wires to the deflection coil
– Other components through which the deflection current flows.
Note: This re-soldering is advised to prevent bad connections due to metal fatigue in solder connections and
is therefore only necessary for television sets more than two years old.
• Route the wire trees and EHT cable correctly and secure them with the mounted cable clamps.
• Check the insulation of the AC power cord for external damage.
• Check the strain relief of the AC power cord for proper function, to prevent the cord from touching the CRT, hot
components, or heat sinks.
• Check the electrical DC resistance between the AC plug and the secondary side (only for sets that have an
isolated power supply). Do this as follows:
1. Unplug the AC power cord and connect a wire between the two pins of the AC plug.
2. Turn on the main power switch (keep the AC power cord unplugged!).
3. Measure the resistance value between the pins of the AC plug and the metal shielding of the tuner or the aerial
connection of the set. The reading should be between 4.5 MΩand 12 MΩ.
4. Switch the TV OFF and remove the wire between the two pins of the AC plug.
• Check the cabinet for defects, to prevent the possibility of the customer touching any internal parts.
2.2 Maintenance Instructions
It is recommended to have a maintenance inspection carried out by qualified service personnel. The interval
depends on the usage conditions:
• When the set is used under normal circumstances, for example in a living room, the recommended interval is
here to five years.
• When the set is used in an environment with higher dust, grease or moisture levels, for example in a kitchen, the
recommended interval is one year.
• the maintenance inspection includes the following actions
1. Perform the 'general repair instruction' noted above.
2. Clean the power supply and deflection circuitry on the chassis.
2. Clean the picture tube panel and the neck of the picture tube.
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