Author Topic: Do PCB Fab houses ever need Schematic?  (Read 9302 times)

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Offline yanir

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Do PCB Fab houses ever need Schematic?
« on: January 31, 2012, 08:30:47 pm »
Has anyone ever heard of a PCB fab house requesting the schematic of a design as standard practice for PCB manufacturing in any circumstance?
 

Offline armandas

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Re: Do PCB Fab houses ever need Schematic?
« Reply #1 on: January 31, 2012, 08:50:38 pm »
Where did you find such a dodgy manufacturer? Just for fun, send them an email asking to sign an NDA and see what happens :D
 

Offline wkb

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Re: Do PCB Fab houses ever need Schematic?
« Reply #2 on: January 31, 2012, 09:37:46 pm »
Where did you find such a dodgy manufacturer? Just for fun, send them an email asking to sign an NDA and see what happens :D

Lemme guess: in PRC?
 

Offline EEVblog

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Re: Do PCB Fab houses ever need Schematic?
« Reply #3 on: January 31, 2012, 09:43:40 pm »
Nope. My spidey sense tells me you are being swindled...

Dave.
 

Offline yanir

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Re: Do PCB Fab houses ever need Schematic?
« Reply #4 on: January 31, 2012, 10:04:02 pm »
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)
 

Online mikeselectricstuff

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Re: Do PCB Fab houses ever need Schematic?
« Reply #5 on: January 31, 2012, 10:28:37 pm »
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.
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Offline yanir

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Re: Do PCB Fab houses ever need Schematic?
« Reply #6 on: January 31, 2012, 10:44:37 pm »
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.


Yes, 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.
 

Offline janekm

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Re: Do PCB Fab houses ever need Schematic?
« Reply #7 on: February 01, 2012, 01:27:51 am »
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...
 

Offline yanir

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Re: Do PCB Fab houses ever need Schematic?
« Reply #8 on: February 01, 2012, 05:59:07 pm »
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?
 

Offline jahonen

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Re: Do PCB Fab houses ever need Schematic?
« Reply #9 on: February 01, 2012, 06:02:19 pm »
For bare board testing, one could supply an IPC-D365A netlist for test purposes. Schematic is not necessary.

Regards, Janne
 

Offline EEVblog

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Re: Do PCB Fab houses ever need Schematic?
« Reply #10 on: February 01, 2012, 09:53:33 pm »
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?

Yep, exactly.
Just tell them no. They can have a netlist if they need it.

Dave.
 

Offline amspire

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Re: Do PCB Fab houses ever need Schematic?
« Reply #11 on: February 01, 2012, 10:46:45 pm »
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
 

Offline Mechatrommer

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Re: Do PCB Fab houses ever need Schematic?
« Reply #12 on: February 02, 2012, 05:47:36 am »
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.
you are so willing to entertain your fab house with this kind of hardwork ;)
i will just ask why if its so difficult testing the pcb, tell them just use the gerber you id**t!
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 

Offline EEVblog

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Re: Do PCB Fab houses ever need Schematic?
« Reply #13 on: February 02, 2012, 06:48:38 am »
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.

Nice!
Make it subtle to leave them guessing...

Dave.
 

Offline DrGeoff

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Re: Do PCB Fab houses ever need Schematic?
« Reply #14 on: February 02, 2012, 06:57:32 am »
You could tell them to download it off the Internet. Seems everything else is there these days :)
Was it really supposed to do that?
 

Offline PCBCORE

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Re: Do PCB Fab houses ever need Schematic?
« Reply #15 on: February 07, 2012, 09:58:43 am »
we never ask Schematic for fab, it's no needed, just ask your manufacturer why need it.

PCBCORE
Rachel
 

Offline Randall W. Lott

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Re: Do PCB Fab houses ever need Schematic?
« Reply #16 on: February 28, 2012, 03:58:55 am »
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.
- Randy
 

Offline yanir

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Re: Do PCB Fab houses ever need Schematic?
« Reply #17 on: February 28, 2012, 02:51:24 pm »
Yeah it didn't make sense to me either.
 

Offline JuKu

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Re: Do PCB Fab houses ever need Schematic?
« Reply #18 on: February 28, 2012, 02:55:01 pm »
That's more like a plumber wanting to know the code to your combination lock.
http://www.liteplacer.com - The Low Cost DIY Pick and Place Machine
 

Offline Randall W. Lott

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Re: Do PCB Fab houses ever need Schematic?
« Reply #19 on: February 28, 2012, 07:29:35 pm »
That's more like a plumber wanting to know the code to your combination lock.

That's a better analogy  ;).
- Randy
 

Offline UME-pcb-manufacturer

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Re: Do PCB Fab houses ever need Schematic?
« Reply #20 on: March 28, 2012, 01:26:32 pm »

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.
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Offline drewtronics

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Re: Do PCB Fab houses ever need Schematic?
« Reply #21 on: May 24, 2012, 06:46:15 pm »
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.
 


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