On 10/11/2009 01:25 PM, David J Taylor wrote: > I had wondered about an internal reset, Kasper, but when speaking with > Garmin I asked whether there was anything I could do like that ad they > said "no". Had it been out of guarantee, it would have been a different > matter, though. How do you crack the unit open without damaging the case? >
The top dome has two onion rings, the outer being 1mm larger than the base. The base is a plastic cup, with a groove in the edge, and a rubber overmold. The top's inner ring fits in the groove, the top's outer ring goes on the outside of the cup. During manufacture a weak, silicone rubber like adhesive is put in the groove, and the top put on. It is held in place with three clips; There's a 'stirrup' in the base, and a hook in the top. Compressed air applied to the breather hole on the bottom loosened the glue. One clip is right next to the thickest bulge in the strain relief. A screwdriver forced under the top there, and with some force applied, it yields. The two other clips then come loose with some wiggling. The -5V on the serial output line is as it should be. I expected it to be RS232-polarity 5V CMOS, but it does have a proper RS232 transceiver with charge pumps. The PPS output of 3.10 is a lot better than the 1us spec. Typical wobble for the decapsulated one sitting indoors is +/-50 ns when observed for some minutes. It is 60ns+/-50ns slow compared to where I think it should be (At the end of 5m cable it is 85+/-50ns slow). /Kasper Pedersen _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
