NP-41 Emulator (may be)
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12-28-2017, 02:25 PM
Post: #355
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RE: NP-41 Emulator (may be)
(12-27-2017 08:34 PM)mwthomasjr Wrote: The second device works great. I have not tried anything with the serial port yet, but otherwise it looks good. The first device is en route back to you as of today (12/27).Thanks. I actually fixed (kind of) Sylvain's faulty unit. It was a hardware issue. With fresh battery the chip measured 2.2V. I used hot gun to remove the chip, clean the pad and re-solder the chip. And have to burn the firmware again to revive it. The memories were corrupted. Unfortunately it only worked for another day. The pad / traces took too much heat and became not reliable to use, I am abandoning it and used it for parts / tests only. I got 10 new PCBs coming in (snail pace from Hongkong). These are with a lot of ground planes which I ignored to put in on the older PCB designs. With the intermittent H/W issues, I tend to think that it's my soldering skill, plus the poorly designed PCBs, which makes the units less tolerating. And tend to fail when the soldering is less ideal. I will have to try these boards and report later. The two 2nd-batch units (one failed and fixed) are working well. I put much more time (say 20 min more intense testing / day, plus 5+ times a day just turn-on-off, run program) on them. Also writing special firmware to do burn-ins. If they are reliable enough, they could be the replacement units for the other 2 failed units. |
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