RD54 Stopped Spinning

Robert Jarratt robert.jarratt at ntlworld.com
Fri Apr 3 07:38:01 CDT 2015

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jules
> Richardson
> Sent: 03 April 2015 13:15
> To: General at classiccmp.org; Discussion at classiccmp.org:On-Topic and Off-
> Topic Posts
> Subject: Re: RD54 Stopped Spinning
> On 04/03/2015 02:58 AM, Robert Jarratt wrote:
> > On a side note, I spotted a component which I can't identify, folded
> > down above the Z8 and stuck to what looks like an adhesive pad on the
> > PCB. The can looks a bit mottled/corroded. On another non-working RD54
> > it seems to be marked "12039". I am not sure what this component is,
> > although it looks like it could be a capacitor. Anyone know what this
> be?
> It's not a thermal fuse, is it? I have absolutely zero  knowledge of the
> RD54 - but thermal fuses are often in cylindrical metal cans and do seem
> to gaining a mottled appearance over time (although it doesn't appear to
> them electrically)

Not sure how to tell. The component number marked on the board uses the
prefix "Y". So it is unlikely to be a capacitor or a resistor. I measured
its resistance (in circuit) and it is almost 1K ohm, so it seems unlikely to
be a fuse, unless thermal ones have a higher resistance?



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