Re: help id'ing a diode from a Toshiba laptop (see pic)

On 16 Dec 2006 12:18:40 -0800, "Carl" <neo0x6@xxxxxxxxx> put finger to
keyboard and composed:

Franc,

Thanks for the reply. The 12Amp fuse did survive ok.

What happened on the polarity error was that this diode literally
fried/smoked (I'm glad I had a pic saved of the board). I plucked it
out in little broken pieces.

Can you help with best make/model/specs for a good replacement of this
type rectifier?

The fuse rating seems odd, so I can't suggest a suitable diode. In any
case you need to find out why your Schottky rectifiers are failing.
Assuming you've corrected your polarity error, then the PIV rating
(30V) of the CMS01 should be more than enough for this circuit, unless
I've misunderstood the workings. Is D1 connected between 19V and
ground?

The power supply specs are 19V ~ 6.3A

Then maybe I'm wrong about the 12A fuse. Also, PC3 appears to be the
main bypass cap, not PC1 or PC2. The latter probably provide HF
bypassing.

Thanks again for your time,
Carl
neo0x6@xxxxxxxxx

http://www.flickr.com/photos/44152487@N00/323329166/


Franc Zabkar wrote:

Do you mean PC1 and PC2? If so, I'm guessing they are capacitors, one
electrolytic, one ceramic. The diode looks like it might just be an
ordinary rectifier. It's job would be to short circuit the input in
the event of a polarity error. However, AFAICS this should take out
the fuse (?) at PF1 (Littelfuse 12Amp?).

Advice much appreciated,

Carl
neo0x6@xxxxxxxxx

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
.

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