Of course components can fail but crystals and ICs are very reliable and in my experience these components only fail after human intervention. Consider this, there are millions of quartz clocks knocking around (I have about 8 without looking, some very old) all with the same or similar crystal to that in the 9200, do they fail or degrade, I doubt it. The only failures I have seen in quartz clocks have been poor battery contacts.
I have not slated your posts but the content of your post #12 is rubbish and therefore irrelevant. The oscillator does not need to be triggered to start, the oscillator is free running providing nothing is stopping it from running, in this case a voltage generated by some chemical process. When I cleaned Martin's board the super capacitor (there is no “standby battery”) had been removed so obviously could not have had any influence. It is inconceivable that the tens, maybe hundreds, of people that have successfully repaired their clock boards have done it due to some fluke of the super capacitor somehow triggering the oscillator into life. If you have any hard evidence to support your theory in post #12 then I'll be pleased to hear it.
I investigated, solved and came up with a solution to the 9200 clock problem that would allow almost anybody to get their 9200 fully functioning again. Before going public I simulated the problem on Martin's board and also on a test circuit on the bench to be sure I'd not missed anything. I did this for my own interest and shared it with the Humax community. I do not intend to rubbish your posts, I simply want the readers to know the facts (not theory’s) and then they can decide for themselves if changing components is worthwhile. Of course there might be the odd board that has a component problem, yours might be it, but of all the people that have posted here and on DS not one that I can recall has failed to repair their 9200 using my instructions.
| Tue 24 Sep 2013 21:53:05
#19 |
