13-08-2014, 07:45 PM
(13-08-2014, 10:31 AM)Mark Hennessy Wrote: I assume you've cleaned the laser?I hadn't thought about greasing the sled rails, but it may be worth trying that. The mechaism is an enclosed type like those used in many car stereos, so a fair bit of dismantling is needed to gain access. Tivoli's service company has already stated that they don't supply circuit diagrams or manuals, but I'm 99.9% certain that the 7808 in in series with the 7809. Must double check that, too. Incidentally the Tivoli CD player retailed on it's own for £299, or as part of a system with a radio/amplifier, etc. for over £500, so it's in a different league from the cheap Chinese gear (although it was made in China!)
What happens after the first minute or two? Does it skip? If so, you might need to clean and re-grease the sled rails.
I wouldn't have thought that the 7809 could be supplying the 7808, as 78xx regulators have a higher dropout voltage than 1V. I think we need to see official schematics for this one...
It's definitely worth trying it from a decent bench PSU first. But if the CD player has been used most days for 10 years, then it's probably time to move on. Despite the clever marketing, these products were built to a price like everything, and 10 years ain't bad really.
That said, the laser assembly might be available for a reasonable price. A couple of years back someone brought me a Tesco special to look at - naturally I assumed that it would be fit for the bin, but it turns out that CPC sold the whole mechanism for about £5. Yes, just five pounds! Astonishing...
