Re: How do i check the clock circuit?

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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Received on Tue Sep 24 05:05:10 2013