A close up photo of the components that need to be removed could save some folks time.
If you are worried about your ability to remove the components: Many SMT components will come off by just a twist with long nose pliers. If worried about pad and trace damage just use a well tinned iron and smaller components will cling to the soldering iron. From: Forrest Christian (List Account) Sent: Monday, August 24, 2015 1:47 AM To: af Subject: Re: [AFMUG] -48 PDU suggestions To anyone seeing the mis-reading voltage issue: Can you let me know the serial numbers of the units seeing this issue? I'm hopeful that they are in the range of 98328 through 98357. It looks like those we built since the last board revision may have an assembly error which is causing this - the pick and place machine was placing some components which should have been 'Do not Populate/Place'. We'll be building a correct batch this week to advance-replace these to fix this issue. The good news is that an earlier unit, *AND* a current revision unit work fine after removing the errant components. Unfortunately, this definitely appears to be a hardware instead of a software issue. I need though to confirm that earlier units (PDU5 serial number before 98328) aren't affected... if anyone is seeing this on a serial number before that number, please let me know. -forrest On Tue, Aug 18, 2015 at 7:49 PM, Adam Moffett <[email protected]> wrote: I'm pretty sure mine were reading the correct voltages until after the software update. Now the 24v input reads 46, and the 48v input reads 61. Hardware or software? Hopefully these can be fixed in software because I need to get them deployed. Does this mean the overcurrent protection won't work right either? These are going to be a long drive away and I don't want to have them not working right and have to go fix them. I'm remembering something... The two new PDUs came with the latest firmware, but I did have to update the 2-relay / 3-switch modules and the older PDU module. Not sure if the old PDU shows the 35 volts now with the updated firmware. I can check again tomorrow. On 8/18/2015 6:51 PM, Forrest Christian (List Account) wrote: I've heard twice now weirdness with that voltage reading. Both in the last week. I haven't had a chance to get it on the bench to test. I'm guessing that I'm reading the wrong adc input somehow. On Aug 18, 2015 4:00 PM, "George Skorup" <[email protected]> wrote: Not to get off topic here, but the two 5ch PDUs I just got show 35.5-ish volts on the master input... with no supply connected. And the status LED doesn't flash like it normally would if it sees no/low voltage on the master. Seems strange. Are these bad or should I just not worry about it? They were both showing that before and after I updated the firmware, BTW. I only have one other one from months ago for a mockup that I never ended up using and it acts normally. It shows like 1.2 volts on the input with nothing feeding it and the status LED does flash 5 or 6 times. -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com
