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K. Adjusting with the oscilloscope
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Fig. VII-30. Correctly adjusted delay-line
For carrying out the adjustments described below, we recommend the use
of the dual-beam oscilloscope PHILIPS PM 3230.
1. Connections and oscilloscope-settings for adjusting the delay-line
circuit and the chroma demodulators.
— connect the Y,,-input of the oscilloscope to the "red" grid of the
picture tube via an attenuator probe.
— connect the YA-input of the oscilloscope to the "red" grid of the
picture tube via an attenuator probe.
— Trigger the oscilloscope externally with the line sync. pulses from
sockets "SYNC." (switch "SYNC." in position "LINE").
— Adjust the time-base settings of the oscilloscope to obtain 2~/ 4 TV-
line periods on its screen, so that two successive TV-lines coincide.
Only then you will be able to notice any misalignments.
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