|
 Apr 14, 2007 |
... We can supply 1-36 layers High Precision print circuit board, Include: Rigid-flex PCB(14layers), High Frequency PCB; Impedance control PCB ; HDI PCB(10layers),Mobile Telephone PCB, Aluminum(cuprum)-backed PCB; BGA Board, Thick Au Products; Thick Copper Products; Backboard; High TG (170C) PCB ; Blind and Buried via PCB ; Free halogen PCB ; FPC Boards ...Etc. Our products having certifications of ISO9000, UL, QS9000, ROHS. It's the first tenet to supply the high quality Product. Thanks & Best ...
|
|
Jan 20, 2010 |
What's your opinions to these PCB Brokers/Sales Agent Name's Leon Xiao, One ordinary PCB Sales From China.Just Wanna share some experiences & opinions with friends here that may concern about the PCB market in China. As you know the current demands on PCB's are arising these days with the warming economy,Unfortunately,The price seems to shrink badly in PCB industry. Buyers of Printed Circuit Board are considering cost more than ever before.Though It's a kinda risk to choose new vendors with low ...
|
|
Jul 12, 2005 |
... CP6 propers, there are values: PCB Check Position X, & PCB Check Position Y. These are the servo counts that the X/Y table moves to when checking if a PCB exists on the table. Your sensor does not detect a PCB, probably because when checking, either a component is on the PCB, or, at this position, the sensor maybe above a routed out section of the PCB (either condition causing it not to detect the PCB). Change these proper values so that the sensor detects the PCB at some other X/Y position ...
|
|
Jan 17, 2002 |
PCB bake Hi, Can anyone help explain the benefits/disadvantages of bareboard pcb baking, as part of the pre-heat conditioning, before the bareboard pcb use in SMT production run? The pcb board is 200mm x 240mm panelized pcb board, and has 28 smaller pcb boards inside the entire panelized pcb. pcb thickness is 0.6mm, and has gold plated pads, typical pad footprint size is for 0402 SMD. we currently bake the bareboard pcb at 90deg-C for 1h, as this was previously set by a ...
|
|
Dec 8, 2002 |
Uneven thermal load in PCB design. Hi, We have been manufacturing a PCB, however it's been quite tricky to profile, as the edges of the PCB are reflowing before the center of the PCB. I have looked at the design, and there is a small power plane for 2.5 Volt in the center of the PCB. I assume this is taking longer to heat up compared to the edges of the PCB where this copper layer had not been extended out to. It's now running through the process ok, however because its our own product we can ...
|
|
Jul 28, 1999 |
Is baking PCB necessary before solder process? Currently, we are baking any PCB before process on SMT, the 'reason' is to dry any possible humidity that could be inner the PCB, it does not matter if the PCB is multilayer or not. We bake PCB's at 107C for 4 hrs and the board must be process into next 8 hours, if not, the PCB needs to be reconditioned again. Evenmore, nobody can tell me if this conditioning is a requirement or not, we just baked as a 'good practice'. Could someone tell me if there ...
|
|
Aug 30, 2004 |
... 2006 we will need to produce Lead free PCB and for now it's hard to get answer to my questions. I'm from Canada and the PCB vendors we actually have are not ready to produce Lead Free PCB ( HASL Lead Free ). For sure OSP (Entek) is not good for me. I produce 400 000 PCB per year so the price is very important but the PCB product must be easy to handle. I participate to a lot of seminar and I receive document from AIM, Kester, Motorola, Loctite and a few PCB vendors in canada. A lot of ...
|
|
Sep 11, 2007 |
PanaPro DSM Went we buy our Panasonic line we have the DSM, I never use it because we do mix several PCB on the same set-up and want to produce top a bottom on one PCB before switching on another one, DSM don't work that way He will optimize all the PCB so we will built bottom of PCB XXXX then Botttom of PCB YYYY then he will switch back to the top of PCB XXX ...
|
|
Apr 15, 2007 |
... a CSM 84 V Check Running Menu Run Mode 2 = Normal (Pass) Mount = Exec (Skip) Data In > PCB > Origin > O* > Skip = No Data In > PCB > Mount > M* > Skip = No Data In > System > Parameter > Position > Waiting Pnt Check that the waiting point is not set at such a co-ordinate that the PCB sensor is seeing the gantry. The pcb sensor also has a sensitivity adjustment - it may be turned up too high. I think your pcb sensor will be DI24 on the DI/DO page. Cable number should be N24. Put your hand over ...
|
|
Jan 8, 2007 |
immersion Gold life span hi' i need advise on immersion gold PCb shelf life. 1) what is the issue shelf life or expire for Immersion gold PCB? 2) How long we can keep the PCB? (with vacuum seal and without vacuum seal) 2) iF PCB expire, can we bake the immersion PCB? what temp & duration? 3) How long can we keep the pCB again after rebaking? (with vacuum seal ...
|
|
Jul 13, 2000 |
... screen legend 11 company logo in foil 12 copyright notice on PCB 13 date code on PCB 14 PCB part number 15 assembly part number on PCB 16 all polarized components point same way 17 components >=0 2" from edge of PCB 18 ground planes where possible 19 test pad or test via on every net to allow in circuit test 20 test pads 200 mils from edge of board 21 mounting holes electrically isolated or not 22 mounting holes with or without islands 23 proper mounting hole clearance for hardware 24 all ...
|
|
Jun 9, 2005 |
... as a carrier material. Cut lip/pocket for PCB so it is 0.05" thinner than thickness of PCB. Allow 0.010" gap on all sides of PCB. Machine lip to width between 0.050" and 0.100" to support under perimeter sides of PCB (check for interference with edge parts to determine this). Cut center material completely out as a 0.8 mm thick, small board will support itself (printer is most trouble here). Remember - BGA's will actually pop off of a PCB if the carrier is too tight - so 0.010" gap is a must! An ...
|
|
May 4, 2005 |
pcb physical handling Handling a PCB 1. Check your ESD slippers and ESD Strap first before entering the SMT production line 2. A PCB manufactred over 90 days must be stored first on the baking Oven before Production 3. Temperature on the Baking oven must be 125plus and minus 5 degree C 4. If a PCB is in the Baking Oven The Minimum hours for it to be stored there is 2 and the Maximum is 4. 5. The PCB must be reflowed in 48 hours upon opening the Bag Otherwise The PCB must be stored again in the ...
|
|
Aug 12, 2008 |
... PCB onto the reflow oven is a direct cost, how about the reflow process time of the PCB while travelling inside the reflow, is that an overhead cost? another angle: say I have auto pcb bd loader, paste printer, p&p machine. my operator loads the pcb's onto the autoloader, this is direct labor cost. But the PCB automatically travels onto the paste printer and being printed then to p&p machine for population, are these considered overhead cost in the calculation? then my operator inspects each PCB ...
|
|
Apr 29, 2009 |
... On Board VS On Breakaway Tab I have a Product with 2 Different PCB Fiducial allocation in the Design. It has 4 Fine Pitch components. The first PCB DO NOT have Fiducial Mark on the board itself BUT has Fiducial on the Break-OFF Tabs. The second PCB has no Break-Off Tab but has fiducial mark on the PCB itself. I believe that the first board was panelized due to the addition of Fiducial Mark which the designer forgot to add. The PCB are 100 percent identical except that one has break-off tab and ...
|
|
Aug 21, 2008 |
... YOU accept this PCB ??? Thanks for your replies. The problems do not appear on the complete lot of PCB's. I don't know the percentage at this point. I agree. It also appears to me that these PCB's are over-etched. The PCB rep say's "Yea, there's a few boards that have problems, but the majority of them adhere to IPC specs". Whatever....I have my doubts. I'm concerned about problems with these assemblies down the road, that we have to warranty, and repair. I don't trust any PCB from this lot now ...
|
|
Apr 12, 2007 |
... Thanks DaveF. Our Chinese PCB vendor (for this particular customer of ours) do have a huge problem to do a proper PCB production quality. Not only do they Not tell us if there is something wrong (hard to produce or whatever) with our Customer PCB gerber-files; they actually do adjustmenst on these board files on their own, whithout asking us!!!! They will never be used again! Our next (second) protype run will take place within the next week. With the very same PCB:s from the same batch as ...
|
|
Oct 1, 1998 |
SOLDER BALL UNDER THE PCB AFTER REFLOW SOLDERING Are there anyone who can give me the answer about solder ball problem? We have 12 layer PCB and double sided PCB. After one side reflow soldering We found lots of solder ball under the PCB. The solder ball was coming out from via hole. So when we print the other side , there are lots of bridge because of solder ball. PCB MAKER said we can not get rid of melted solder in the via hole during HAL process. Is it true or not. Do I have to make things ...
|
|
Feb 9, 2001 |
PCB Design Program - simple! Does anyone know a simple PCB design program, for single and double sided PCB's? I am looking for a simple to use PCB design software for Win9x or NT for small home projects. Something like "Express PCB" at: http://www.expresspcb.com but with "rats-nets" (or auto-routing) option would be excellent. The staff I'm finding so far is either too simple or too professional, and nothing in between. I have ...
|
|
May 22, 2006 |
Low Cost High quality pcb prototype and Assembly manufacturer(CH Low Cost High quality pcb prototype and Assembly manufacturer(CHINA) +silk+mask price is same. if you send pcb file to us,we will reply quote as soon! we can assembly for your company!! if any question, please send mail us!!!!!! Sell high quality HDI PCB (CHINA) we supply quick pcb. we supply color board, Mail: njpcb@vip.163.com or sales ...
|
|
Aug 27, 2004 |
... encounter few cases PCB was delam after reflow, and the supplier was refuse that this is a PCB manufacturing defect as the fallout is low within one lot. the cost for this scrap is high after PCBA level, my query here are 1) is there any way to determine or confirm the incoming bare PCB is good before reflow? 2) i know baking before use is good, but the long cycle time is not allow me to do that, can i reflow the PCB using normal profile before printing? if the bare pcb having problem , it will ...
|
|
Sep 19, 2002 |
About the PCB gold finger contamination. Thank you ur reply Dave. Let me explain our COB workflow: 1. unpack PCB (FR4,LPI,HASL)(the thickness of gold and nickel we can't be find)(No SMT before) 2. clean the pcb by rubber 3. blow the pcb by di-ionic gun 4. attach die by adhesive gel 5. cure the adhesive gel at oven (100 C ,30 min) 6. bonding (wire bonding,bonder ASM AB509 ,Al wire 1 um) At step 6 we discover the pads and the wire cannot be connect. At this moment we suspect the PCB vendor give us ...
|
|
Sep 29, 1999 |
Help! 2-layered Thru-Hole PCB Solder Mask/Soldering Problem Hi everyone, Greetings! I�ve got a 2-layered through-hole PCB�s having the following problems: Solder Mask peels after wave soldering at random locations and only at the bootom side of the PCB Insufficient Solder and some solder never make it to the top-side of the pcb�s. Poor Wetting Blow-hole Some Joints have voids No Solder These problems happen only to one of our pcb vendor and the rests are okay. The solder mask type is ...
|
|
Feb 28, 2001 |
... a water based flux? Are the solder balls mainly around or near non-plated holes or near the edges of the PCB? If so the preheat must be set so the water content of the flux is fully evaporated before the board hits the solder wave. If water remains on the PCB then as the PCB hits the wave the water instantly vapourizes, causing pressure between the wave and the underside of the PCB. Where there are gaps such as non-plated holes etc. then this pressure is rapidly released, causing the molten ...
|
|
Dec 11, 2009 |
X-Ray Inspection of Plated PCB - Need Your Input Hi All, I have a PCB that is bonded on an aluminum plate. The size of PCB is 11" x 8" and 0.065" Thick, The aluminum plate has the same size and thickness as the PCB. Process is Lead Free. Questions: Is it possible and achieveable to bond the PCB with only 20% of void area? Is it possible to measure and quantify the void area using an X-Ray machine? thanks and regards
|
|
Dec 9, 2008 |
PCB Baking after Wash SMT-ypw: Does PWB supplier start to implement PWB drying packaging? B3: YES! The fabrication of the PCB involves a series of wet processing that requires counter-measures to remove moisure. While some of the PCB processes also include bake cycles that have dehydrating qualties (multilayer press, solder mask cure, letter screen cure, etc.) it is variously recommended that the PCBs receive a final bake specifically for dehydration purposes. So, yes, the PCB Fabricator starts ...
|
|
Jul 14, 2008 |
Solder Mask Bubbling On PCB from Supported Via Holes I have a board with the above problem from our PCB supplier. After they applied the solder mask and run the PCB's to HASL process, the solder mask bubbled on one side of the PCB making the solder mask thickness higher and PCB looking awkward. They said they are pushing in solder mask inside the holes during my conversation with them...what is that "pushing in solder mask inside the via" process? is this common way of applying solder mask onto ...
|
|
Aug 7, 2006 |
PCB type for BGA Dear Sir, To design PCB with 0.8mm pitch BGAs, is ENIG PCB is better than Tlectro-plating PCB? Why? Than, what is the most effective way to determine the connection between BGA and PCB is good and strong enough ...
|
|
Jan 13, 2006 |
electrical check PCB Hi, I would like to ask you how you test the PCB (electrical test) of first PCB before starting production.? What kind of equipment you are using? and method to confirm that components on PCB are correct (value, orientation, describtion, polarization) against the BOM and drawing of the PCB.? We rae right now using multimeter to check all resistor, capacitor, inductor and description from the components and than comper with BOM. But we found that this is very faulty. It ...
|
|
Dec 13, 2005 |
PCB intake speed on a Soltec oven Hi, We have a problem sometimes where our soltec oven will accept another PCB too soon after it's taken the last one, so the PCB will collide with the last PCB that just enter the oven, and knock half the components off one of the boards, and destroy it. Does anyone know how to set a Soltec oven to pause the in-feed conveyer until the previous PCB has progressed into the oven a safe distance. Or I thought you could do some kind of SMEMA delay between the ...
|
|
Apr 27, 2004 |
... Pete C Few question. If i have fine pitch PCB for example 0.5 or 0.4 mm, it is difficult to adjust manualy without vision (for the first PCB) and accurantly solder land on PCB with stencil -> reduction apertures in stencil and question how find center?. I thought that vision start playing important role at the beginning for the first PCB, help set precisely printing process. You gave tip to work without Mylar. Ok but again how you set stencil and PCB? using magnifying glass?? to catch aperture ...
|
|
Mar 5, 2003 |
PCB Bake Currently, my company's applies a PCB bake (5 hours @ 125C) for all SMT PCB's prior to surface mount assembly. Many of us believe this is a non-value added activity, and have concluded it can be eliminated. With today's PCB process controls coupled with dry packing or vacuum sealing the PCB's when shipped, the bake could be eliminated. Doe anyone out there have information in the form of engineering white papers, articles, etc. that will provide adequate data to support the hypothesis ...
|
|
Dec 6, 2002 |
SMT Assembly over Flexible PCB Printing: use rigid carrier plate to hold and support your flexible PCB. tooling holes in PCB to position on the plate, two-sided tape to hold PCB in place. Oven: same carrier plate, use capton tape or clamps to hold PCB in place. I believe some industries use a composite material for the carrier plate that is light and machinable. It will stand the heat repeatedly ...
|
|
May 5, 2002 |
Gold plated PCB's Hi mate, we had a crap experience (once...no more...) with gold plated over nickle (Au/Ni) PCB that had nickle contaminents in the PCB supplier's gold bath. the Ni caused batch-delivery of the PCB to us for mass production, to exhibit the visible symptoms of solder refusing to fusion wet into the gold pads (we did batches of shear tests to see this). the solder fusion was great with all the components. on the worse extreme PCB batches, we had components being pushed off the ...
|
|
Jan 2, 2002 |
PCB Manufacturers Certificate of Conformance Hi Guys, What most of you do with the above cert. of conformance that comes on a certain batch of PCB's from the PCB manufacturers ? It also comes with a micro section of a PCB showing the internal of a PTH Via Barrels. I kept receiving them from every PCB Product that we have (during every delivery) but I dunno what to do with them and I'm not from QA department. Is QA suppose to have them ? Thanks in advance ...
|
|
Nov 7, 2001 |
Dek compared to MPM Dear Mr. Jeff, Our SMT room are using the DEK288 and MPM2030 Printers at the same time. We found the similar problem also as mentioned by MR.JOHNW. We analysis it was mainly caused by the PCB metal fixture used in DEK288. The PCB metal fixture is about 0.2mm thickness, it causes the stencil could contact the PCB surface tightly, especially near to the edge side area of the PCB. So it'll make excess paste on the PCB, Best regards! Marshall
|
|
Oct 19, 2001 |
... did such solder paste deposits on PCB bareboards before, (before my physical join with my current company), approximately 2-3 years ago, for a small Lot run. What the PCB supplier did was to apply "block" shaped Sn/Pb paste alloy onto the PCB nickle (BIB) pads. Pitfalls are : 1) the PCB cannot be subject to certain baking temperatures, (no one remembers the recommend limits) Ours was a BIB (backplane board), so it required mandortary baking process. 2) the PCB pads advisable NOT to chemical ...
|
|
Mar 16, 1998 |
PCB Warping. We have just go another batch of PCB's from our loaders, and some of the boards are severely warped. The boards are PCI cards and one of the boards is 9mm out at one end. The PCB is 210mm long and 4 layers. I am wondering if anyone knows what could cause this. Is it a PCB manufacturing problem, perhaps with the inner layers that causes the PCB to warp when in the reflow oven, or is it bad handling in the reflow oven like too long at too high a temperature. There is no yellowing of ...
|
|
Apr 3, 2001 |
PCB Acceptance Standards I am looking for standards that describe acceptance criteria for PCB's. Anyone.....anyone.....Buhler. My company is an OEM manufacturer and I want to know what to look for when we receive PCB's from our PCB fab vendor. Specifically, solderability and visual criteria for gold plated surface mount PCB's. Concerning solderability, how to test, how many to test, what is good or bad, etc. So far, I have identified J-STD-003 as a possible source. Thanks ...
|
|
Apr 13, 2005 |
Immersion silver life span hi' i need advise on immersion silver PCb shelf life. 1) what is the shelf life for Immersion silver PCB? 2) iF PCB expire, can we bake the immersion PCB? what temp & duration? 3) How long can we keep the pCB again after rebaking? (with vacuum seal ...
|
|
May 8, 2008 |
... sophisticated equipment, we are able to manufacture PCB up to 30layers such as environment protection, thick gold plating, hidden or blind hole, high frequency , metal based, me tal core, flat resistance, high Tg thick copper, mix-materi al and flex-ri gid PCB. We also provide the pcb as sembly service and membrane fabrication for our customer. For more information about our products and services,e-mail us or visit our website (ABP are PCB manufacturer in China.) We sincerely hope to establish a ...
|
|
Jul 12, 2001 |
Screen Printing with a Pallet. A) Questions: 1) What sort of pallet materials used? 2) what PCB thickness & LxW size? 3) what stencil type & thickness used? 4) what profile type used (peak deg-C)? 5) any peak Deg-C contraints for the components SMT onto the PCB? B) We use pallet support, for 0.8mm PCB placement onto pallet, screen print paste with pallet support, auto-send to SMT p&p process (with pallet support), and reflow using pallet support.... (reflow was RTS profile with peak 215 deg-C) C ...
|
|
Jan 13, 2008 |
PCB Support in Pick and Place Hi, We need to solder a USB plug onto a PCB in our SMT machines, and this is the same type of plug you see on USB storage devices. It's a very flat connector with 4 SMT pins, however the hard part is the bottom of the connectors is the same level as the bottom of the PCB. So the PCB kind of recesses into the connector. To solder it we are going to need to support the connector, so would need some kind of smt palette to hold the pcb when it's being loaded on the pick ...
|
|
Sep 6, 2004 |
Bare PCB reflow hi, we are running high mixed low volume here, and i encounter many pcb delam after reflow issue. here some doubt need ur advise: 1. actually, what is max temperature and duration can a bare PCB reflow without any quality problem? if i allow bare PCB go thru. reflow oven 2x time, what is the side effect will i face? 2. Normal baking for pcb is 125C for 24 hrs, if i would like to reduce the time, what is the max. temp can i go and what is the duration? 3. any website or article ...
|
|
Sep 17, 2009 |
PCB Pad become brownish after IR reflow The colour you see on the pads is tin/copper intermetallic layer. In your reflow the immersion tin coating and the copper pad underneath react to form in intermetalic layer. The effect is worse the hotter the pcb or area of the pcb gets. In IR reflow there will be quite a variation in the temps across your pcb so that is why the effect is in different parts of the pcb. You'll also find it's not as solderable as the original pads were. Keeping the pcb peak ...
|
|
Oct 24, 2006 |
... now but we had problems with most initially and 1 is trouble still. All boards are same material, same PCB manufacturer. Initially, when the delam. problem occured, the PCB house changed process and the 5 builds seem to be O.K. now. I do not understand the processes involved to manufacture a PCB but they ended up having to make the resin or epoxy layer between material layers in the PCB's thinner or something like that. (from what I understand, moisture did not seem to be a root problem when ...
|
|
Jul 20, 2006 |
Bare PCB Fabricators John. My name is Bill Csonka. I am an x pcb designer now sales engineer representing Photocircuits Inc. out of Glen Cove, New York. Photocircuits is the first and oldest domestic PCB supplier in the USA originally founded in 1950. Traditionally, they were always known as a high volume automotive PCB shop. However,with most of that business going offshore in the late 1990's they changed their philosophy to a fast turn proto(short run) , medium and high volume production house ...
|
|
Aug 12, 2005 |
... long period of time (depends also of how your pcb:s are made)? Second: The pcb supplier does not ship the pcb:s in a proper sealed MBB (Moisture Barrier Bag) with a moisture sensitive indicator card in it (they never do, and We All Should Complain About This), just like the way you recieve your MS-level sensitive components. I had to admit, that is very seldom that we recivie pcb:s in that type of bags. We had some success in baking pcb:s prior to assembly & reflow, beacause of board warp. But ...
|
|
Aug 8, 2005 |
PCB finish for RoHS? Ted, Is your pcb problems after reflow process related to the change of color of the pcb to yellowish? I have such problem when running thru' the pcb under ROsH condition. This pcb does not change color previously when running under non-ROsH condition. I wonders if it is also related to the pcb finishing. Regards ong
|
|
Nov 14, 2002 |
Reflective coating on PCB I am looking for a reflective coating on PCB. I have designed a PCB with SMT type side LEDs and Top LEDs. The light from these LEDs fall on to a lens profile on top of these and get mangnified and reaches the dashboard instrument's pointers. I tried fixing a aluminium foil on top of PCB the result was good. The light improved on the dashboard instrument with the existing LED. I wish to know whethre we can try : a) Reflective soldermask b) Hot foil stamping/printing c ...
|
Back to the Top
