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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: UPC 78M05 HF?(DATA?)168 degrees! I think I do need a higher current voltage regulator. posted by cfraser on February 23, 2001 at 21:17:57:
Thanks for you info.I took a chance at doing some upgrading on this unit.
Replaced the larger caps in the power supply areas. (I guess.)
Replaced 2 2200uf 25v rubycons with 2200uf 35v Nichicon muse FG's,
and the 4 diodes around these, (2amp diodes)with 4amp 600v Harris diodes.
This is the circuit that is right after the transformer plug
on the main board.
A 3300uf 25v rubycon was replaced with a Nichicon muse FX 3300uf 50v.
This appears to be a rectifing circuit,(I wish I changed the 4 diodes
here but I set a 40 dollar limit upgrade.)
Then I changed 2 470uf 100v rubycons to 470uf 100v Nichicon muse
FA's.
These are most likely powering the tube circuit or relation.
This 7805 I.C. is in this area.
Threw in some sockets, and put a couple of op275's next to the
output jacks.I'll quick fix this with radio shack option, because this regulator
seems a little warm for me, and I would feel more safe.Maybe get a few more hours out of it.
I wonder if this regulator is blown?
This thing had some tracking/slowness glitches.
Upgrade seemed to cure it, though I never would have thought in million years that this would have happened.The player sounds kind of raspy, but a little better than it did.
The bass seems alright, but the high ends kinda nasty.I plan on purchasing a new player soon.
It basically boils down this:
''A Turd is a Turd''.
Thanx for the help!
Mike Stehr
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Follow Ups
- Re: UPC 78M05 HF: Vain attempt at cd upgrade. - Mike Stehr 01:54:43 02/24/01 (0)
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