| Rheilly Phoull <rheilly@bigslong.com>: Apr 08 06:04PM +0800 On 8/04/2017 5:33 PM, pamela wrote: > 20 seconds after the mains is disconnected. Also hard drives in > Playstations and PVRs will spin on. Telling impatient kids to go and > make a cup of coffee isn't going to work. You might want to regulate your relatives when they are in YOUR HOME. As you say some things need a few seconds to reset. |
| Davey <davey@example.invalid>: Apr 08 11:16AM +0100 On Sat, 08 Apr 2017 10:33:44 +0100 > 20 seconds after the mains is disconnected. Also hard drives in > Playstations and PVRs will spin on. Telling impatient kids to go and > make a cup of coffee isn't going to work. My Humax HDR Fox T2 says to wait until you hear the HDD wind down before turning it on again. Otherwise, I generally try to wait for 30 secs. as a rule of thumb, although I'm not always that patient. Not that I have to reset stuff much anyway. If they're in your home, then visitors work to your rules! -- Davey. |
| David Woolley <david@ex.djwhome.demon.invalid>: Apr 08 12:03PM +0100 On 08/04/17 10:33, pamela wrote: > As a rule of thumb, what's the shortest period to switch off > electronic equipment for a reset before switching on? There are two issues here: 1) allowing long enough for a reset to be reliable; 2) ensuring it is safe to power down before doing so. On the second point, PVRs, in particular, do not seem to be designed to be really safe to power down at any time, as there is no way of putting them into a soft power down state. You have to make sure that there are no recordings scheduled and put them into standby. On my Humax, you then need to wait until the red light dims Otherwise, you will be relying on the consumer user defences built into the disk drives ensure that the current write completes and the heads park, and also to recover any logical damage to the filesystem. Even PC's are quite good at this these days, and should never be given a hard power down until a soft power down has completed, unless they have completely locked up and there is no reset button. On the first point, it depends on the design of the electronics as to how long it takes for all capacitors to discharge sufficiently to put them into a clearly off state. Remember that some devices will detect a warm start by reading RAM, and maximum retention times, without refreshes, are not characterised for dynamic RAM, only minimum ones. Also the time constants associated with some faults that require resets can be hours. Where a hard power cycle is needed, I would probably go for about 30 seconds for the first attempt, and then overnight, if the first attempt doesn't succeed. Of course, you should not need to reset the device this way at all, unless there is a fault, so it is probably something that you should not allow visitors to do at all. |
| Davey <davey@example.invalid>: Apr 08 12:11PM +0100 On Sat, 8 Apr 2017 12:03:14 +0100 > Of course, you should not need to reset the device this way at all, > unless there is a fault, A few days ago, for the first time that I have ever seen, my Humax refused to respond when I tried to turn it on. Neither the remote control nor the big button would make it work. I turned it off with the switch on the back panel, waited some time, probably less than 30 seconds, and then turned it on again. Since then, it's worked fine. The log showed nothing of any use, so I have no idea what the problem was. The unit is now about 4 years old, and was a refurbished unit when I got it, so I have had my money's worth if it failed at any time. -- Davey. |
| MJC <gravity@mjcoon.plus.com>: Apr 08 05:15PM +0100 In article <ocafrr$ehp$1@dont-email.me>, david@ex.djwhome.demon.invalid says... > On the second point, PVRs, in particular, do not seem to be designed to > them into a soft power down state. You have to make sure that there are > no recordings scheduled and put them into standby. On my Humax, you > then need to wait until the red light dims My Humax (old 9200T) will record even when in standby. On the other hand, it sometimes gets stuck and has to be powered down to reset it. And I give it several seconds, but not as many as 30! Mike. |
| pamela <invalid@nospam.com>: Apr 08 10:33AM +0100 As a rule of thumb, what's the shortest period to switch off electronic equipment for a reset before switching on? I mean equipment like televisions, PVR, satellite or cable boxes, PCs, cordless phones, clock radios, etc. My teenage relative reset our Humax PVR by switching it off and almost INSTANTLY switched it on again. I told him to be patient but how long should he wait for in general? Twenty years ago 5 seconds would have been enough but nowadays some electronic devices (like my Samsung tv) shows its power LED for 10 or 20 seconds after the mains is disconnected. Also hard drives in Playstations and PVRs will spin on. Telling impatient kids to go and make a cup of coffee isn't going to work. |
| pamela <invalid@nospam.com>: Apr 08 12:37PM +0100 On 12:11 8 Apr 2017, Davey wrote: > so I have no idea what the problem was. The unit is now about 4 > years old, and was a refurbished unit when I got it, so I have > had my money's worth if it failed at any time. To my young relative 30 seconds is like an eternity. If I advised him to wait 30 seconds before turning equipment back on again, he would never manage it. However his OFF-ON is so quick that it makes me think on some occassions he could create a power surge. |
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