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Biggles has requested the following to be posted to correct assertions made in the above posts.
Quote:With reference to the second paragraph in post #24 I would like to point out that this is not the behaviour of the circuit during the clock failure that my repair instructions refer to. Also there is no ‘kick-start’ required to restart the oscillator, it runs freely once the problem contamination has been removed. While the affected part of the circuit is high impedance (I used the word sensitive in my instructions due to the intended audience) I certainly did not say or imply “and will just drift until the output hits a supply rail and latches up” because it doesn’t.In a recent PM to me from Pottsy he has revealed that the cleaning fluid he used was a professional product designed for cleaning components, switches and printed circuited boards. I would not expect this type of product to remove the contamination causing the clock failure and would urge the use of the cleaning agent I recommend. I used ethanol but surgical spirit (mainly ethanol according to the bottle I looked at in Boots) has been used successfully by many and is probably the best alternative to pure ethanol. I would expect methanol, isopropanol and methylated spirits (denatured alcohol or household meths) to also work. Household meths is cheap, is mainly ethanol with additives to make it unpleasant to drink and sometimes dyed purple as a warning.
As an additional help, after cleaning the clock end of the board with cotton buds and a small brush it might be advantageous to hold the board clock end down and brush on more cleaning fluid to effectively swill down the cleaned area, shake off the excess and blow dry with a hair dryer. Obviously only lightly warm the board rather than toasting it.
Biggles
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