Hello Listers;
Saturday I clock chipped 4 LC-575 boards. And 3 of them are running
Happily at 37 MHz.
One a rev B board 93-94 dated, had a canned crystal on it not a
surface mount, so I had no way of getting to the connection points on the
crystal like on the surface mount.
I tried desoldering it but was afraid of damaging the board after 2
legs were done. So I carefully removed the can by cutting it off.
Installed the socket, pin 1 not connected, pin 7 to Gnd, pin 14 to
+5v, and the jumper(socket pin 8) to lifted pin 8 of the clock driver.
Reinstalled, turned on and nothing!!
I've changed crystal, rechecked everything a dozen times. Pin 7 is
going to ground as best as I can tell, checked between other grounded
items.
Pin 14 is going to +5 side of other items (capacitors).
I give up, board is not damaged in any way.
Could it be that it needs the original crystal installed, (to supply
resistive load or timing) like the other installed surface ones(or any
crystal in the location)??
Any help would be great.
Thanks,
Terry
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