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Careless handling during repair can reduce life drastically.When repairing, make sure that you are connected with the same potentialas the mass of the set by a wristband with resistance. Keep componentsand tools also at this potential. Available ESD protection equipment:
Complete kitESD3 (small tablemat, wristband, connection box, extension cable,and ground cable) 4822 310 10671.
Wristband tester 4822 344 13999.
zTogether with the deflection unit and any
zBe careful during measurements in the high voltage sectionand on the picture tube.
zNever replace modules or other components whilethe unit is switched ON.
zWhen you align the set, use plastic rather thanmetal tools. This will prevent any short circuits and the dangerof a circuit becoming unstable.
Notes
z Measurethe voltages and waveforms with regard to the chassis (= tuner)ground ( / ), or hotground ( 0 ), depending onthe area of circuitry being tested.
zThe voltages and waveforms shown in the diagramsare indicative. Measure them in the Service Default Mode (see chapter5) with a color bar signal and stereo sound (L: 3 kHz,
R:1 kHzunless stated otherwise) and picture carrier at 475.25 MHz (PAL)or 61.25 MHz (NTSC, channel 3).
z Where necessary, measure the waveforms and voltages with( + ) and without ( , ) aerial signal. Measurethe voltages in the power supply section both in normal operation
(. ) and in standby( - ). These valuesare indicated by means of the appropriate symbols.
zThe picture tube panel has printed spark gaps.Each spark gap is connected between an electrode of the picturetube and the Aquadag coating.
zThe semiconductors indicated in the circuitdiagram and in the parts lists are completely interchangeable perposition with the semiconductors in the unit, irrespective of thetype indication on these semiconductors.
7/8/2004
