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2. Advance the contrast and brightness controls fully clockwise.
3. If no picture appears check the video drive and source connections
particularly green for sync on green models or composite sync if
there is a separate line. No picture will appear without the sync
signal.
4. When a display appears note the stability of the displayed image.
If it is not stable or it is displayed from centre, switch off the
mains supply
remove outer plastic case only by removing four
screws from the rear panel and two screws from the centre portion.
It may be convenient to remove and replace signal and power cables
at this stage, since they pass through the rear cover. See
Fig. 10