On 11 December 2014 at 01:10, Bob Camp <kb...@n1k.org> wrote: > Hi > > I suspect that if you look closely at the board in the unit, it’s got water > stains on it …. > > Bob
I suspect you might be right Bob, but I am not going to break the seal to open it up to find out. I will be contacting the seller, to see what they offer. Does anyone have any experience with these having the voltages going unstable? These two log entries show the 15 V is going both too high and too low. Log 004:20141017.00:00:11: 15V is out of tolerance, value: 16.62 Log 007:20141017.00:00:11: 15V is out of tolerance, value: 13.78 This shows the 5V rail has gone too high Log 078:20141210.00:00:11: 5V is out of tolerance, value: 5.54 This shows the oven current is out of spec - whether it is too high or too low is anyones guess Log 022:20141205.04:42:26: Primary oven current is out of tolerance, value: 115.81 I'm guessing the 115.81 is mA, but I don't know. If it is mA, 116 mA doesn't seem an unreasonable number. I assume this will have an oscillator "similar" to a 10811A - lets not worry about the exact type. According to the data sheet for the 10811A, the oven resistance has a minimum of 42 Ohms. Supply voltage is 20-30 V. So a quick calculation shows the turn-on current could be as high as 30/42 = 714 mA, so 116 mA doesn't sound unreasonable. The 10811A data sheet says the power consumption is typically 2 W steady state at 20 V. So that's a current of 0.1 A @ 20 V, so once again, 116 mA seems quite normal for a steady state value, and a bit low for heating up. I've not opened a case on eBay yet. I will do at some point, but would like to know the likely fault on this. The fact it does actually work, probably indicates there's nothing too serious wrong with it. I suspect a cap(s) is failing, which is quite common with age, and fairly easy to fix. Having looked carefully, there are a few tell-tale signs this case is actually not an original HP one, but I am not overly bothered by that. It looks good, and if the unit worked, I would be happy. It is rather annoying that people leave this seller positive feedback, or no feedback if they get their complaints resolved. I've had a few people email me about this seller, but they all seem keen not to say anything on a list, and looking at the feedback of the seller, it is still 100% positive. There is definitely something fishy about this seller, but the 100% positive feedback does not reflect that. I also wonder why they cleared the log, as the first log entry shows Log 001:20141017.00:00:00: Log cleared I wonder if they had problems that they thought they had solved? Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.