Re: How do i check the clock circuit?

Thanks guys, the info on spotting a clock visually was especially helpful.
Sometimes the skill level of guys that have been doing this work for such a
long time skips past many of the most basic yet useful pieces of
information that a newbie simply doesn't yet know. Now at least I know what
to look for on the PCB in the 'real' world as well as the schematic.

On Tue, Sep 24, 2013 at 2:08 AM, Andre Huijts <a.huijts@upcmail.nl> wrote:

> The clock signals are generated using crystals. They are easy to ID,
> usually a flat aluminum colored can:
>
>
>
>
> More modem versions look like this, if you see these, the crystal has
> probably been replaced in more recent years:
>
>
>
>
> This may sound weird but your first work should be visual. Check if the
> crystals are there at all and if they are still firmly soldered. I actually
> started measuring for a clock signal only to discover some seconds later
> that it was missing :) The crystals often get damaged or broken off during
> stacking PCBs or transport because they stick out high above all the other
> parts. This is also why I prefer to replace them with the smaller modern
> types.
>
> A general visual inspection is always a good idea. Look for damaged
> tracks, bad sockets etc. in case of SW PCB set, make very sure the
> interconnection board is on really tight.
>
> Verstuurd vanaf mijn iPad
>
> > Op 24 sep. 2013 om 10:49 heeft Andrew Welburn <andy@andysarcade.net>
> het volgende geschreven:
> >
> > You need to get the manual and schematics and read them, they you will
> know where all these things are...
> >
> > Andrew Welburn
> > http://www.andys-arcade.com
> >
> >> On 23/09/2013 23:33, Joel Griffin Dodd wrote:
> >> Thanks Ed!
> >>
> >> No problem on waiting for the probe to arrive, I'm moving house this
> >> week so I have plenty to keep me busy.
> >>
> >> How do I physically identify a clock/chip/oscillator on a board? Also
> >> how do I know which line out is the clock line?
> >
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> chris@westnet.com
>
>

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Received on Tue Sep 24 09:32:48 2013