Kieran
Why not use a crystal oscillator module */or ttl - cmos - transistor */
oscillator it's output going to the crystal input pin on the pic, after
removing the crystal that may not be working that way you prove the circuit
part of your project.

The crystal that is on your board may have been damaged by heat / fracture
of encapsulation by stress on pin ect....
you could biuld a crystal caps and a LED test bed to see what your circiut
is doing..

Art artb@cabelinet.co.uk

----- Original Message -----
From: Kieran Miller <kieran@MAC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, April 12, 2000 10:33 AM
Subject: Why isn't my crystal oscillating?


> Hi,
>
> Well, I got hold of a 'scope and checked out OSC2 - it's sitting at a DC
> level of 1.2V. Not moving at all. OSC1 is also constant - at 0.15V.
>
> What could this mean? The crystal is connected across OSC1 and OSC2, and
has
> a 30pF capacitance to ground on each leg. The ground is a plane layer in a
4
> layer PCB.
>
> I'm driving my circuit with a 3V power supply, and I've checked the power
> connections around the chip. /MCLR is high. Interestingly, the LED I've
> connected between RE0 and ground glows dimly when I turn the circuit on -
> why is this? (The PIC code is supposed to drive all of port E high when it
> starts executing, but I don't think it's getting this far, based on what I
> see at OSC1 and OSC2.)
>
> I've checked the configuration bits - they're set to HS oscillator with
LVP
> Enable off and Debug off.
>
> Any ideas?
>
> Kieran