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.
z
Together with the deflection unit and any multi-poleunit, flat square picture tubes form an
integrated unit. The deflectionand the multi-pole units are set optimally at the factory.
Adjustmentof this unit during repair is therefore not recommended.
z
Be careful during measurements in the high voltage sectionand on the picture tube.
z
Never replace modules or other components whilethe unit is switched ON.
z
When 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.
z
The 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.
z
The picture tube panel has printed spark gaps.Each spark gap is connected between an
electrode of the picturetube and the Aquadag coating.
z
The 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.
Pa
e 3 of 3SPMS
7/8/2004
