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Old 1st January 2012, 12:04 AM   #511
amc184 is offline amc184  New Zealand
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Could you describe more specifically what it does when it cuts out? Does it just stop playing, does it lose the ToC info or does it shut off completely?
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Old 1st January 2012, 02:17 AM   #512
wlowes is offline wlowes  Canada
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Default Slightly off topic update

Excuse a slightly off topic moment. I too have sidelined my Alpha for a bit. Recall in my case I messed up the main board and the balance ended up as a USB/1541a/tube dac. The PCM2706 USB died. No, that's good news as I wanted to upgrade to asyncronous USB. Have ordered an XMOS based board from a cool guy on this site. The interesting thing is it will enable me to play high res content on the Arcam audio board. 24/192 will be possible. I know the 1541a is only 16 bit, but it will apparently ignores the extra bits and sounds great. Should be interesting to hear.

This has spawned a couple of projects.

USB2 is best supported in Unix, so I am dabbling in those waters toying with a dedicated Alix processor that picks music off a netserver and passes it to the USB. Easy to build power supply and may even fit in the arcam box. Very cool, but complicated.

Meanwhile, I messed with my backup CD to the point of destroying it. So last night went looking for a new Alpha and tripped over a Rotel 855 for sale in my home town. Its the real deal, German engineered, 1541A N2 chip & Blackgate caps for $100! With just a power cord swap to take conditioned power, its rivalling my earlier efforts. I plan to take our best learnings from this site and like Andrew take my time this time. Who knows where that will end up. I must say I am addicted to the 1541a

I am enjoying a quiet new years eve at home with my wife, fine food, German beer and fine music. All the best for a happy and safe new year.
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Old 1st January 2012, 03:56 AM   #513
SimontY is offline SimontY  United Kingdom
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Quote:
Originally Posted by amc184 View Post
Could you describe more specifically what it does when it cuts out? Does it just stop playing, does it lose the ToC info or does it shut off completely?
It stutters and then stops just as if the stop button had been pressed. The display shows the TOC. If you press play it will fail very quickly in exactly the same manner.

Happy New Year everyone
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Old 1st January 2012, 04:57 AM   #514
amc184 is offline amc184  New Zealand
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That's exactly what mine was doing. I'd have at look at what the mainboard's +5V rail is doing once the player has warmed up. I'd also check on the temperature of the mainboard's 7805 regulator and make sure it's still well mounted to its heatsink. If it's a 78M05 type (the medium power version) I'd replace it with a 7805.

If that doesn't turn up anything of interest, maybe it's time to get a can of freezer spray and see if cooling anything has any effect.
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Old 1st January 2012, 12:12 PM   #515
SimontY is offline SimontY  United Kingdom
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Fantastic, cheers.

And Walter - that project sounds amazing. It does sound rather complex too! The Rotel sounds fun too.
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Old 2nd January 2012, 09:57 AM   #516
Chivvyp is offline Chivvyp  United Kingdom
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Quote:
Originally Posted by SimontY View Post
Once it has warmed up and "crashed" pressing play will only get it moving for a few seconds before it shuts down / resets again. Based on this it's surely temperature-related, but that could be regs, caps, mechanism grease, ceramic caps(??) etc.
Hi Simon,

Don't want to be a doomsayer I had a similar problem once, turned out to be the 1541. It was easy for me to check as I had a spare chip and it was on a socket. Once the new chip was in I never had the problem again.

Regards

Pete
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Old 2nd January 2012, 10:36 AM   #517
SimontY is offline SimontY  United Kingdom
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Hi Pete,

Could that be random chance? I didn't think the 1541 chip actually affected playback in these machines - just whether you can hear it or not.

Simon
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Old 2nd January 2012, 04:16 PM   #518
Chivvyp is offline Chivvyp  United Kingdom
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yeah, I missunderstood your symptoms, thought you were just losing sound
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Old 2nd January 2012, 04:18 PM   #519
SimontY is offline SimontY  United Kingdom
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Nope, it just stops with an "error" after a 35-40min warm-up period of perfect playback. I've got an annoying cold or something so feeling lazy about fixing this!
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Old 7th January 2012, 11:26 PM   #520
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Default Main board grounding

New topic :

On the Phillips main board I, like everyone else who have them, have several factory made solder blobs on link wires that act as grounds - which are pretty handy.
Being that they are all effectively soldered ( connected ) to the copper cladding on the surface can I just create my own anywhere I please ?
This is purely for my own convenience as I decide where to put my regs - in an effort to get them as close as possible to the receivers.
Am I wrong in assuming I can just add solder to it and use that new point or must I connect to ground at the nearest available original solder blob ?

Thanks
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