Brainless SMD pcb people - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: October 30, 2021, 07:23:15 am
content: This board we get made in China, it must have had a part missing so one of their rocket scientist production staff sorted it out but good. Missing part was an S08 555 and the replacement was something else again...

author: ogden
author_rank: Super Contributor
timestamp: October 30, 2021, 07:57:30 am
content: I doubt his is deliberate. Machine operators cut corners for speed, mistakes happen. Could be so that other customer is wondering about 555 on their PCB

author: Circlotron
author_rank: Super Contributor
timestamp: October 30, 2021, 08:10:50 am
content: It must have been put on by hand so I'd call it negligent if nothing else. Did they not notice the 8 solder pads didn't match up with the 10 legged device they put there and soldered by hand?

author: Nusa
author_rank: Super Contributor
timestamp: October 30, 2021, 08:40:24 am
content: How many boards were ordered, and why must it have been put on by hand? The reflow job as a whole is on the crappy side, but that's visible even in the componentless via's.

author: Siwastaja
author_rank: Super Contributor
timestamp: October 30, 2021, 08:42:14 am
content: There was a whole thread of extremely stupid assembly mistakes like this, some even more obvious, I remember one where the whole PCB was flooded with solder covering half of it, yet QC missed that.Most if not all of those examples were by Western assembly houses.

author: Circlotron
author_rank: Super Contributor
timestamp: October 30, 2021, 10:24:08 am
content: Quote from: Nusa on October 30, 2021, 08:40:24 amThis is the only board like this so far. I'm at about number 400 of a batch of 1000. It's not like every board was like this! It must have come out of the P&P machine missing the part and there was this substitute part laying around that got stuck in there by hand.

author: spiette
author_rank: Newbie
timestamp: October 30, 2021, 10:55:57 am
content: I'd think it more likely the PnP machine had a random part in it's feeder.

author: daqq
author_rank: Super Contributor
timestamp: October 30, 2021, 11:58:01 am
content: Mistakes happen. Had issues with both western and eastern companies, both similar and worse. Report the issue, ask for partial refund. It's annoying, sure, but everybody screws up occasionally.

author: Siwastaja
author_rank: Super Contributor
timestamp: October 30, 2021, 12:56:04 pm
content: Expect to see quite a few mistakes on assembly services. Assembly is far more difficult than just fabricating bare PCB from gerber images. There is so much to go wrong.Also machine setup time is expensive, even in China, so ordering "a few" for test means hand placement of many/most of the parts. There will be human errors, it's difficult job to do right 8-10 hours a day on designs you have no idea about. Quite different to building a prototype of your own design where you "know" everything.If you can find an assembler which almost never makes mistakes and is still affordable and quick enough, you are extremely lucky.

author: ogden
author_rank: Super Contributor
timestamp: October 30, 2021, 01:17:37 pm
content: Likely PnP reported drop, operator took replacement part from wrong feeder, placed manually and missed to notice package difference