Re: Help needed identifying failed components

Wolfi <publicalfa-ng@xxxxxxxx> wrote in
news:iHwji.4419$Oz7.2489@xxxxxxxxxxxx:

Am 05.07.07 23.30 schrieb Eeyore:

Wolfi wrote:

I got one of those small, 1/3W, maybe even 1/2W, fusible metal film
resistors, which burnt through, due a failing diode in a computer
monitor's SMPS.

Now I'm having some trouble to identify the value of this R. There a
5 colour rings on it, distributed symmetrically.
In the center: BlK - Gld - Blk and, a hair thinner, Red and what
appears to be Brn, one on each side on the thicker contact caps.

Now, how is this one to be read, starting with Red or with Brn?
And what is the meaning of the 2 rings following the gold one? Which
one is tolerance and what is the other one for?

The blown diode has the following on it: B119 HER303 (1,3mm wires,
body 9.2mm × 5.2mm diameter).

Could anybody please provide some specs on it and possibly one or
more suitable replacement types?

HER303 is a rectifier.
http://www.google.com/search?&q=her303

Thanks. Yesterday I only had access to a Mail/News client, so I
couldn't use a search engine. I now found a few possible replacement
types.

But I'm still stuck with the colour code puzzle of this fusible
resistor :-\


Probably Red, Black, Gold, Black, Brown. (Assuming the gold really IS gold
and not some weird metallic shade caused by burnt pigment). The value
likely begins with Red for 2, that would be a very unusual tolerance band.

So, maybe 2 ohms with unusual markings, 3 colours for 1,0,/10, unused, and
brown for 1% tolerance at the end. The fourth band might have been printed
by a machine ready for the 4-colour scheme for value, but set to put the
unused black band for the old three colour scheme after the multiplier
instead of before it as is usual on metal film types in readiness of an
extra significant digit.

If the gold colour is a result of burning (I have seen bands look silver as
a result of this, and the centre band is the first to burn), it might just
be standard 1% tolerance 5 band 200 ohms, Red, Black, Black, Black, Brown.
.

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