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Quite a few people go for DVD players when their CDPs pack up.
They're a cheap option with the option of using an external DAC.
(If not quite as operationally convenient as a dedicated CDP)
Maybe you've already opened up your 6003 and had a look - to ensure a spotless laser lens and no dried out lubrication on moving parts - that's what I'd be doing first.
it Could be something simple, like the lens needs cleaning, or the mechanism is sticking. ( had a rega do this)
As suggested, pop it open and do a bit of basic cleaning.
If the laser/mechanism is faulty. Maybe a competent computer repair guy could pop one in there for you.
Or, use it as a reason to upgrade? If you go for the 6006 uk se, it has a front USB port, so you can use that instead of the cd drawer.
I was going to replace my old defunct CD with a CD6006. The CD5005 seemed to compare favourably and was much cheaper. I don't need a USB port. I got a mint condition one from an Az warehouse deal on Prime Day for £134, which I consider a bargain. .
I'd agree that it is worth trying to clean the lens first.
I think all 3 unit's might use the same dac (CD5005,6006 and PM6005), so buy what ever is cheapest and use the built in dac in the PM6005/6006 will give you CD6006 sound quality or very close if you don't use a marantz cdplayer.
If Greenwich_Man has a PM6005 or 6006 amp he could use the dac with a cheap cdplayer if cleaning the lens don't work