Was in Greece last week and using the MBP with a three to two pin adapter when I noticed I was getting a very mild buzz type shock when I touched any part of the top case surrounding the keyboard. Removing the mains power or insulating myself (i.e. sitting on wodden chair and lifting feet) removed buzz effect.
Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
On Tue, 21 Aug 2007 08:02:07 GMT, Darren Griffin - PocketGPSWorld.Com wrote:
Was in Greece last week and using the MBP with a three to two pin adapter when I noticed I was getting a very mild buzz type shock when I touched any part of the top case surrounding the keyboard. Removing the mains power or insulating myself (i.e. sitting on wodden chair and lifting feet) removed buzz effect.
Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
Dunno, but I get it a lot of the time in our house. I guess it's just a bad earth.
Darren Griffin - PocketGPSWorld.Com darren@redacted.invalid wrote:
Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
Doesn't the MBP power supply have an earth pin these days (unlike the older laptop PSUs)? With these unearthed supplies and a TiBook, I would get a similar 'buzz' which I could eliminate by earthing the Mac.
Maybe the plug adapter you were using in Greece didn't complete an earth circuit, or (a nastier thought) the earth on the electrical supply in Greece was faulty?
Peter Ceresole peter@redacted.invalid wrote:
Maybe the plug adapter you were using in Greece didn't complete an earth circuit, or (a nastier thought) the earth on the electrical supply in Greece was faulty?
As Darren was using a 2 pin adaptor, there wouldn't be an earth connection. The buzz is nothing to worry about, it's usual for the output of many designs of switched-mode power supplies to float at a level above earth.
On 2007-08-21 09:02:07 +0100, Darren Griffin - PocketGPSWorld.Com darren@redacted.invalid said:
Was in Greece last week and using the MBP with a three to two pin adapter when I noticed I was getting a very mild buzz type shock when I touched any part of the top case surrounding the keyboard...Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
Happens to me regularly with my MBP too, in the UK.
Cheers, Ian
On Aug 21, 11:47 am, Ian McCall i...@redacted.invalid wrote:
On 2007-08-21 09:02:07 +0100, Darren Griffin - PocketGPSWorld.Com dar...@redacted.invalid said: ?
Happens to me regularly with my MBP too, in the UK.
Cheers, Ian
Mine too. Feels strangely alive. It actually seems to vibrate slightly when you run you finger lightly long case near the track pad. Only when on mains power, earth pin or not no matter where in the world.
On 2007-08-21 11:10:49 +0100, matthew.sylvester@redacted.invalid (Matthew Sylvester) said:
As Darren was using a 2 pin adaptor, there wouldn't be an earth connection. The buzz is nothing to worry about, it's usual for the output of many designs of switched-mode power supplies to float at a level above earth.
That figures, I didn't have a travel kit but will invest in one, that should have an earthed two pin plug I assume?
In article 2007082109020750073-darren@redacted.invalid darren@redacted.invalid "Darren Griffin - PocketGPSWorld.Com" writes:
Was in Greece last week and using the MBP with a three to two pin adapter when I noticed I was getting a very mild buzz type shock when I touched any part of the top case surrounding the keyboard. Removing the mains power or insulating myself (i.e. sitting on wodden chair and lifting feet) removed buzz effect.
Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
I don't know about Greek electrical power regs but AIUI in the UK some years ago we went over to grounding Neutral at each property so it won't float above ground. Seems like the Greek arrangement lacked this feature, letting the entire computer become live when not grounded. A high-resistance leak from mains to case would be enough.
D wrote:
On Aug 21, 11:47 am, Ian McCall i...@redacted.invalid wrote:
On 2007-08-21 09:02:07 +0100, Darren Griffin - PocketGPSWorld.Com dar...@redacted.invalid said: ? Happens to me regularly with my MBP too, in the UK.
Cheers, Ian
Mine too. Feels strangely alive. It actually seems to vibrate slightly when you run you finger lightly long case near the track pad. Only when on mains power, earth pin or not no matter where in the world.
I'm sure this has been raised before. I know I experienced this and apparently it's caused by using the slide on plug for the PSU and not the mains cable with the plug on the end which IS earthed. Try it and see.
On 2007-08-21 14:06:52 +0100, DBSnappa davidjREMOVEMEboughton@redacted.invalid said:
I'm sure this has been raised before. I know I experienced this and apparently it's caused by using the slide on plug for the PSU and not the mains cable with the plug on the end which IS earthed. Try it and see.
Looks like that is indeed the cause, the slide on plug has no electrical connection in the slide whereas the cable does, an odd ommission? I'd never noticed this issue before but replacing the cable with the plug and there it is, the tingling across the case.
Darren Griffin - PocketGPSWorld.Com wrote:
On 2007-08-21 14:06:52 +0100, DBSnappa davidjREMOVEMEboughton@redacted.invalid said:
I'm sure this has been raised before. I know I experienced this and apparently it's caused by using the slide on plug for the PSU and not the mains cable with the plug on the end which IS earthed. Try it and see.
Looks like that is indeed the cause, the slide on plug has no electrical connection in the slide whereas the cable does, an odd ommission? I'd never noticed this issue before but replacing the cable with the plug and there it is, the tingling across the case.
Thought so :)
I always leave the cable plugged into the PSU now.
On 21/8/07 10:11, Rexx Magnus wrote:
On Tue, 21 Aug 2007 08:02:07 GMT, Darren Griffin - PocketGPSWorld.Com wrote:
Was in Greece last week and using the MBP with a three to two pin adapter when I noticed I was getting a very mild buzz type shock when I touched any part of the top case surrounding the keyboard. Removing the mains power or insulating myself (i.e. sitting on wodden chair and lifting feet) removed buzz effect.
Having now returned to the UK I can no longer replicate the problem so not sure what could have acsued it?
Dunno, but I get it a lot of the time in our house. I guess it's just a bad earth.
I had it last week on an installation with an earth trip - I checked - using a G4, weird.