ITT/KB CK500: Corona discharge

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Question

The problem with this set seems to be corona discharge- a jagged vertical band on the left-hand side of the screen. The picture itself is otherwise OK. The colour to the right of the band is correct but to the left it is as if one of the primary colours is missing – lacking red – while the band itself is red. The line output stage has been carefully checked and new valves fitted but everything seems to be in order.

Solution

This fault should disappear when the colour is turned off, eliminating corona discharge as a cause. There seems to be something wrong with the PAL switch and we suggest you replace the 47pF bistable cross-coupling capacitors C220 and C225 ( top of decoder board) with 68pF types

ITT/KB CVC5 chassis

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