Do PCB Fab houses ever need Schematic? - Page 1
Forum section: electronics / general

author: yanir
author_rank: Regular Contributor
timestamp: January 31, 2012, 08:30:47 pm
content: Has anyone ever heard of a PCB fab house requesting the schematic of a design as standard practice for PCB manufacturing in any circumstance?

author: armandas
author_rank: Frequent Contributor
timestamp: January 31, 2012, 08:50:38 pm
content: Where did you find such a dodgy manufacturer? Just for fun, send them an email asking to sign an NDA and see what happens

author: wkb
author_rank: Super Contributor
timestamp: January 31, 2012, 09:37:46 pm
content: Quote from: armandas on January 31, 2012, 08:50:38 pmLemme guess: in PRC?

author: EEVblog
author_rank: Unknown
timestamp: January 31, 2012, 09:43:40 pm
content: Nope. My spidey sense tells me you are being swindled...Dave.

author: yanir
author_rank: Regular Contributor
timestamp: January 31, 2012, 10:04:02 pm
content: I can't get into details. but someone told me that was common practice and used it as an excuse for a"problem"that occurred.No chance this is done for high complexity boards? (not that mine is)

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 31, 2012, 10:28:37 pm
content: Unlikely but not inconcievable that it may be helpful for bare-board test.Obviously if they are populating, testing and faultfinding then they would want a schematic.

author: yanir
author_rank: Regular Contributor
timestamp: January 31, 2012, 10:44:37 pm
content: Quote from: mikeselectricstuff on January 31, 2012, 10:28:37 pmYes, if they are doing all that it makes sense, but for PCB fab only it I've never been asked for one in other situations.

author: janekm
author_rank: Unknown
timestamp: February 01, 2012, 01:27:51 am
content: I did once see a reference to performing flying probe testing of multi-layer HDI boards against the schematic net list so it does exist, but it's certainly not common...

author: yanir
author_rank: Regular Contributor
timestamp: February 01, 2012, 05:59:07 pm
content: So it seems that it would make sense under certain circumstances, but normally not needed. Sounds more like it would be by request only and not standard practice.Would people agree?

author: jahonen
author_rank: Super Contributor
timestamp: February 01, 2012, 06:02:19 pm
content: For bare board testing, one could supply an IPC-D365A netlist for test purposes. Schematic is not necessary.Regards, Janne

author: EEVblog
author_rank: Unknown
timestamp: February 01, 2012, 09:53:33 pm
content: Quote from: yanir on February 01, 2012, 05:59:07 pmYep, exactly.Just tell them no. They can have a netlist if they need it.Dave.

author: amspire
author_rank: Super Contributor
timestamp: February 01, 2012, 10:46:45 pm
content: If they get difficult, send them a schematic, but change all the parts. Make every resistor a 1 ohm 0.01% value, and change all the ic part numbers to a NE555. All of the capacitors can become inductors.Richard

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 02, 2012, 05:47:36 am
content: Quote from: amspire on February 01, 2012, 10:46:45 pmyou are so willing to entertain your fab house with this kind of hardworki will just ask why if its so difficult testing the pcb, tell them just use the gerber you id**t!

author: EEVblog
author_rank: Unknown
timestamp: February 02, 2012, 06:48:38 am
content: Quote from: amspire on February 01, 2012, 10:46:45 pmNice!Make it subtle to leave them guessing...Dave.

author: DrGeoff
author_rank: Frequent Contributor
timestamp: February 02, 2012, 06:57:32 am
content: You could tell them to download it off the Internet. Seems everything else is there these days

author: PCBCORE
author_rank: Contributor
timestamp: February 07, 2012, 09:58:43 am
content: we never ask Schematic for fab, it's no needed, just ask your manufacturer why need it.PCBCORERachel

author: Randall W. Lott
author_rank: Regular Contributor
timestamp: February 28, 2012, 03:58:55 am
content: That's like a plumber wanting to know what kind of wood you used to build your walls. I wouldn't be comfortable if they asked me that. Be careful.

author: yanir
author_rank: Regular Contributor
timestamp: February 28, 2012, 02:51:24 pm
content: Yeah it didn't make sense to me either.

author: JuKu
author_rank: Frequent Contributor
timestamp: February 28, 2012, 02:55:01 pm
content: That's more like a plumber wanting to know the code to your combination lock.

author: Randall W. Lott
author_rank: Regular Contributor
timestamp: February 28, 2012, 07:29:35 pm
content: Quote from: JuKu on February 28, 2012, 02:55:01 pmThat's a better analogy.

author: UME-pcb-manufacturer
author_rank: Newbie
timestamp: March 28, 2012, 01:26:32 pm
content: it only needs gerber files transfered by your disgn software. it's okay. No schematic.you know gerber file? which is individual pattern layer, like conductor, soldermask, silksceen, outline, nc-drill...etc.

author: drewtronics
author_rank: Contributor
timestamp: May 24, 2012, 06:46:15 pm
content: I had a local assembly house (USA) ask for a schematic for a project I was having assembled. I kind of questioned their skills and they later admitted that they would be hand assembling everything, not using a pick and place like I requested. Asking for a schematic screamed sketchy business to me then, and still does now.