Hungerdunger Posted February 14, 2011 Report Share Posted February 14, 2011 I hope some of the more technically-minded people here might be able to help diagnose this problem and tell me whether its likely to be fixable. I bought one of my NH1s some five or six years ago and having tested it put it away until I dug it out last week. On trying to get it going I discovered two faults: 1) It is impossible to start it playing from "sleep" from the unit itself. None of the buttons have any effect. However I can start playback using the remote (although it sometimes takes two presses to get it going), and once the machine is "live" all its buttons work fine. It is also OK if I open the clamshell and close it (which activates the display) and then operate the buttons before the display disappears. 2) When I drop it into its charging cradle it refuses to charge. I've tried different batteries, both of which work in my other NH1. Any ideas? Quote Link to comment Share on other sites More sharing options...
Azureal Posted February 14, 2011 Report Share Posted February 14, 2011 I have noted very similar behavior with my NH1 which I purchased new in August of 2004. If I recall, it was related to the battery and it's inability to charge in the NH1 itself. If I charged another battery in a DH10P or an RH1 and then transferred that charged battery into the NH1, it seemed to work. I plan to sell my NH1 soon as it is only collecting dust and I want to get a few bucks out of it while I still can. Quote Link to comment Share on other sites More sharing options...
sfbp Posted February 14, 2011 Report Share Posted February 14, 2011 I would tentatively suggest that it, along with many other MD units, needs recalibration of the charging circuits after a while, along the lines I have noted in several other threads. Stephen Quote Link to comment Share on other sites More sharing options...
Hungerdunger Posted February 15, 2011 Author Report Share Posted February 15, 2011 I would tentatively suggest that it, along with many other MD units, needs recalibration of the charging circuits after a while, along the lines I have noted in several other threads. Hi Stephen, Would that account for the first fault where it can only be turned on via the remote? If so, is it an expensive repair? (I don't think it's anything I could attempt myself). Quote Link to comment Share on other sites More sharing options...
sfbp Posted February 15, 2011 Report Share Posted February 15, 2011 I have zero experience of NH1, and I doubt it is a good idea for you to send here, given that Jim has all the expertise and understands the problem. It will be new territory for him, but it's really a matter of following the roadmap laid down by Sony. And he's in Yorkshire, which makes a heck of a difference to you (maybe not to someone in Europe) because the post will be quick. And yes, I think many of these strange quirks can be ascribed to low voltage at critical spots. Cleaning contacts helps too. Quote Link to comment Share on other sites More sharing options...
jim.hoggarth Posted February 15, 2011 Report Share Posted February 15, 2011 I have zero experience of NH1, and I doubt it is a good idea for you to send here, given that Jim has all the expertise and understands the problem. It will be new territory for him, but it's really a matter of following the roadmap laid down by Sony. And he's in Yorkshire, which makes a heck of a difference to you (maybe not to someone in Europe) because the post will be quick. And yes, I think many of these strange quirks can be ascribed to low voltage at critical spots. Cleaning contacts helps too. Hi all. As Stephen will testify, I am gradually working my way into Hi-MD units, which require a few more disciplines and tools than the 'basic' MD80 units. It is going quite well, and my stock of parts is building up, although it's an expensive process as these machines command high prices even when total non-workers. I don't recognise the non-functioning buttons problem on the unit, although I have come across the wake up by remote 'feature' which seems to be when the unit is in total power-down mode, rather than the situation where the unit has been used only recently and wakes up on the first remote key press. The battery charging problem could one of several things, including voltages, although that would contradict Stephen's Malaysia theory as the NH1 was made in Japan. You are welcome to post it off to me for inspection, in which case PM me for my postal address. Jim Quote Link to comment Share on other sites More sharing options...
sfbp Posted February 15, 2011 Report Share Posted February 15, 2011 I am not sure that my argument about low voltage being systemic has anything to do with the NH1, since these units use a LiIon battery charging system, which no doubt has quite different charging characteristics. There's special parameters in the firmware NVRAM for both LiIon and NiMH in many of the (newer) units, so probably simply following the procedure for adjustment is the best thing to do. The principle is the same, though - detect a battery is charged by very slight changes in the voltage at its terminals. Quote Link to comment Share on other sites More sharing options...
Hungerdunger Posted February 15, 2011 Author Report Share Posted February 15, 2011 You are welcome to post it off to me for inspection, in which case PM me for my postal address. PM sent. Quote Link to comment Share on other sites More sharing options...
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