Philips L06.1E AA Safety Instructions, Warnings, and Notes, Maintenance Instructions, General

		Safety Instructions, Warnings, and Notes		L06.1E	2.	EN 5
2. Safety Instructions, Warnings, and Notes
Index of this chapter:		1.	Perform the “general repair instruction” noted above.
2.1	Safety Instructions	2.	Clean the power supply and deflection circuitry on the
2.2	Maintenance Instructions		chassis.
2.3	Warnings	3.	Clean the picture tube panel and the neck of the picture
2.4	Notes		tube.

2.1Safety Instructions

Safety regulations require the following during a repair:

•Connect the set to the Mains/AC Power via an isolation transformer (> 800 VA).

•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.

•Wear safety goggles when you replace the CRT.

Safety regulations require that after a repair, the set must be returned in its original condition. Pay in 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 flows. In particular this is valid for the:

1.Pins of the line output transformer (LOT).

2.Fly-back capacitor(s).

3.S-correction capacitor(s).

4.Line output transistor.

5.Pins of the connector with wires to the deflection coil.

6.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 Mains/AC Power lead for external damage.

•Check the strain relief of the Mains/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 Mains/AC Power plug and the secondary side (only for sets that have a Mains/AC Power isolated power supply):

1.Unplug the Mains/AC Power cord and connect a wire between the two pins of the Mains/AC Power plug.

2.Set the Mains/AC Power switch to the "on" position (keep the Mains/AC Power cord unplugged!).

3.Measure the resistance value between the pins of the Mains/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.

4.Switch "off" the set, and remove the wire between the two pins of the Mains/AC Power plug.

•Check the cabinet for defects, to prevent touching of any inner parts by the customer.

2.2Maintenance Instructions

We recommend a maintenance inspection carried out by qualified service personnel. The interval depends on the usage conditions:

•When a customer uses the set under normal circumstances, for example in a living room, the recommended interval is three to five years.

•When a customer uses the set 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:

2.3Warnings

•In order to prevent damage to ICs and transistors, avoid all high voltage flashovers. In order to prevent damage to the picture tube, use the method shown in figure “Discharge picture tube”, to discharge the picture tube. Use a high

voltage probe and a multi-meter (position VDC). Discharge until the meter reading is 0 V (after approx. 30 s).

V

E_06532_007.eps 250304

Figure 2-1 Discharge picture tube

•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 prevents circuits from becoming unstable.

2.4Notes

2.4.1General

•Measure the voltages and waveforms with regard to the chassis (= tuner) ground (￿), or hot ground (￿), depending on the tested area of circuitry. The voltages and waveforms shown in the diagrams are indicative. Measure them in the Service Default Mode (see chapter 5) with a colour bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz for PAL, or 61.25 MHz for NTSC (channel 3).

•Where necessary, measure the waveforms and voltages with (￿) and without (￿) aerial signal. Measure the

voltages in the power supply section both in normal operation (￿) and in stand-by (￿). 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