SMTnet.com Electronics Manufacturing Forum http://www.smtnet.com/Forums/ Printed circuit board assembly, surface mount technology and electronics manufacturing forum discussions from SMTnet.com. Wed, 27 Jul 2016 03:37:48 GMT Manncorp 384 pick and place issue emergency stop!! http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18896 any help is much appreciated, I keep getting a random shutdown, sometimes a few minutes sometimes after a few hours. "emergency Stop, Please check the stop button" of course no one is touching the stop button and the button does not seem to be faulty. If anyone has any ideas or experience with manncorp 384 I would really appreciate your imput. mike Tue, 26 Jul 2016 09:50:21 GMT FEEDER : X-Y out of range! Pick up by Head 2 http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18903 Up and running smoothly this morning, but got the attached error when switching from a reel feeder to a tray of the same part. We are getting this error message during setup - any suggestions are welcome. I am available to answer any questions that might help to resolve this. Manncorp MC 391V mc391 (Vision Align) MD Pick & Place Machine Ver.6.7.6d Tue, 26 Jul 2016 09:48:44 GMT Panasonic vs Siplace which one better? http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18891 Hi,going to buy a new pick and place,any advise? AM100 (Panasonic) vs e series (siplace). I think both spec is quite similar. Thanks in advance. Mon, 25 Jul 2016 16:35:37 GMT orientation of polarised smd components on reels/tapes http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18900 I want to place smd's by hand from tape strips using a vacuum pump. What is the orientation of polarised smd components on reels/tapes? Is there a standard manufacturing orientation, or are there variations? I understand some manufactures have part-tapes joined together by contractors, and sometime with orientation errors. What is regarded as the left & right side of tapes? Thank You. Mon, 25 Jul 2016 09:11:25 GMT op-amp http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18902 Hi, To enlarge the 3.6 V of PWM wave of MCU to 6 V which control on and off of transistors. But op-amp part never amplifies out . Simulation diagram is shown in the figure. Op-amp is LM368h and 8 v single power supply.The datasheet of LM368h is <a class=roll href="http://www.kynix.com/Detail/458662/LM368H-2.5.html." target="_blank">http://www.kynix.com/Detail/458662/LM368H-2.5.html. </a> During the simulation time, I will adjust R1 of potentiometer to 666 ohm indeed which can amplify voltage to 6V. But in the actual circuit, even if R1 is set to 1 k, it can only be adjusted to about 4.25 V. If I amplify the power supply of op-amp, for example to the 12 v or so, it is 6 v. I thought for a long time, but I don't know what's the problem.Generally op-amp can be amplified to VCC - 0.8 V, which is about 7 V. But actually it cannot meet. Thank you very much! Mon, 25 Jul 2016 04:49:28 GMT op-amp http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18901 Mon, 25 Jul 2016 04:37:16 GMT does anyone know about JUKI electric feeder and machinery feeder difference http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18841 now days, I face a problem for JUKI electric feeder and machinery feeder. i do not know about any of electric feeder. until now, we all use machinery feeder for CF081ER 7' real holder and 15' real holder,CF03HPR ,FF12FS,FF16FS,AF24FS-OP. but this time when purchasing, someone told me the electric feeder is more compestive and higher efficency. he told CF081ER 7'and CF081ER 15' use 8mm electric feeder replace, and 12/16mm,24mm for ,FF12FS,FF16FS,AF24FS-OP. I do not know. does anyone can help? Mon, 25 Jul 2016 03:39:25 GMT Arguments against 1(or 2)-ethoxy-propanol for cleaning flux residue? http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18894 Hi, is there a reason why washing "no-clean" flux residue off of boards with 1(or 2)-ethoxy-propanol is not a widespread practice? This chemical is more commonly known as Henkel/Loctite/Multicore SC01. I've long known, as I'm sure most people do, that if you try to wash no-clean flux residue off of boards with acetone it simply turns the clear residue into much uglier flaky crusty white residue. I recently discovered by accident that this crusty white residue is exceptionally soluble in SC01. So if you rinse the board with acetone, then rinse with SC01, you wind up with a perfectly clean residue-free board. Surely I am not the first to figure this out. So why isn't the practice more widespread? I'll admit that I've never tried water washable fluxes. I've heard they have disadvantages, like washing being required (not just optional) to prevent corrosion, short stencil life, humidity sensitivity, etc. Why don't people just use no-clean and wash it with acetone followed by SC01? Sat, 23 Jul 2016 18:13:37 GMT EKRA E4 consistency issues http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18895 I started a new job about 6 months ago, and the screen printer is an Ekra E4. I have never used one before, but have used a variety of them and I have 13 years experience mainly in surface mount. I cannot seem to get consistency out of this machine no matter what I try. After having this problem on more complex boards, I tried a simple board, nothing smaller than an 0805 package. It is flat, nothing out of the ordinary on it. My board supports are sufficient. I will get several good prints in a row, then all of a sudden I will get a bad print. Usually the next print is a good one. I have tried both synthetic fiducials and using pads for the alignment. Anyone have experience with this printer? I can't seem to grasp why I am having such differences between prints. It feels like it is catching fiducials wrong intermittently. I read the manual, it didn't really help. The downside to working for a smaller company is I don't have the budget to throw money at the problem, but even if I did, I don't know who to even call for support on one of these printers! Fri, 22 Jul 2016 14:42:33 GMT Thermocouples for Reflow Profiling http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18866 Quick question for all you SMT Experts... Where do you buy your thermocouples for Reflow Profiling? Thu, 21 Jul 2016 14:14:26 GMT Can anybody recommend some reliable EMS company in Mexico? http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18898 Can anybody recommend some reliable EMS company in Mexico? Thu, 21 Jul 2016 05:11:44 GMT VI technology 5k vs 5K 3d AOI( what are the improvements that they have made in the new 3d 5K AOI) http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18897 We are trainee engineers doing research on the vi technology 5k and 5k 3d AOIs, we would like to know the advancements that they have made in the new 3d 5k AOI, and any setbacks if there are any. Wed, 20 Jul 2016 23:02:44 GMT Lead trimming http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18890 I'm looking for a hand held lead trimming set of cutters with a catch bag for the leads. Has anyone seen this before? I found a few from Chinese websites but need something from a US link. Wed, 20 Jul 2016 07:10:14 GMT FUJI CP3 WILL NOT ENGAGE http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18893 Hello, I am having trouble getting our old CP3 to start up. When the machine starts to run, or when we try to center the nozzles, the CAM moves to 300 degrees and stops. The station 5 rotor just turns and turns with out ever centering the nozzles. At first I assumed that there was some grease or gunk on the sensor, but I cleaned it up. I verified that the sensor is working by going into the I/O. You can see it turn on and off when the rotor is turned by hand and the zero setting dog reaches the sensor. Does anyone know what might cause this? Thanks for any help. Tue, 19 Jul 2016 18:08:28 GMT Reflow soldering problems and traces under component http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18886 Some people involved in PCB assembly process claim that SMD components reflow soldering problems are often caused by traces running under a component. According to this claim, trace (or any copper) covered by solder mask and placed under SMD component is high enough to lift slightly component body and cause reflow soldering problems. It may happen if component standoff height (a gap between component body bottom surface and component lead bottom surface) is 0. Is it a correct claim? I compared the numbers (however I’m not sure if they are precise) and it looks that trace running under the component body shouldn’t touch it and cause any reflow soldering problems. Assuming that PCB is 100% flat and copper thickness is uniform and there is LPI solder mask: Max height of trace covered with solder mask above PCB surface: Copper thickness + 1 mil (solder mask thickness) = copper + 1 mil Height of solder paste layer above the PCB surface: Copper thickness + 0.25 mil (ENIG plating thickness) + 2 mils (solder paste thickness)= copper + 2.25 mils Running traces under SMD components is sometimes hard to avoid when there is no enough space on the board. Also, if the claim is true, using copper pour on the external layers of the PCB should be avoided. However, copper pour is often necessary to provide shielding and also to balance copper on the PCB. So, can solder mask covered traces (copper) under SMD components cause any reflow soldering problems? Are only some components like leadless QFN for example, prone to soldering problems if they are traces under them? Tue, 19 Jul 2016 18:07:33 GMT Reflow soldering problems and traces under component http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18886 Some people involved in PCB assembly process claim that SMD components reflow soldering problems are often caused by traces running under a component. According to this claim, trace (or any copper) covered by solder mask and placed under SMD component is high enough to lift slightly component body and cause reflow soldering problems. It may happen if component standoff height (a gap between component body bottom surface and component lead bottom surface) is 0. Is it a correct claim? I compared the numbers (however I’m not sure if they are precise) and it looks that trace running under the component body shouldn’t touch it and cause any reflow soldering problems. Assuming that PCB is 100% flat and copper thickness is uniform and there is LPI solder mask: Max height of trace covered with solder mask above PCB surface: Copper thickness + 1 mil (solder mask thickness) = copper + 1 mil. Height of solder paste layer above the PCB surface: Copper thickness + 0.25 mil (ENIG plating thickness) + 2 mils (solder paste thickness)= copper + 2.25 mils Running traces under SMD components is sometimes hard to avoid when there is no enough space on the board. Also, if the claim is true, using copper pour on the external layers of the PCB should be avoided. However, copper pour is often necessary to provide shielding and also to balance copper on the PCB. So, can solder mask covered traces (copper) under SMD components cause any reflow soldering problems? Are only some components like leadless QFN for example, prone to soldering problems if they are traces under them? Tue, 19 Jul 2016 18:07:33 GMT Through hole SMD in SMT process-Length question http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18887 Hello, Experts I have a question about Through hole SMD part in SMT process The PIN Length can't over PCB board how many that will happen defect? any advice or data(IPC rule maybe) ? Thanks Wish you have a nice day Tue, 19 Jul 2016 18:05:31 GMT MPM spare parts http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18817 Hello, I have now an old MPM with severely scratched Platens that need to be changed. From Speedline told me that this product is discontinued and the Platens are no longer offered. Do you guys know any other source, where I can buy them? Tue, 19 Jul 2016 13:25:08 GMT Does anyone have Mycronics manuals for M15 and M19? http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18892 We are trying get Mycronics manuals for old M15 and M19, can anyone point us in the right direction? Or better yet, supply pdf manuals? Tue, 19 Jul 2016 12:19:19 GMT Upside down placement of a crystal oscillator is acceptable ?? As per IPC 8.3.2.9.2 clause its define Rectangular or Square En http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18888 Upside down placement of a crystal oscillator is acceptable or not ?? As per IPC 8.3.2.9.2 Rectangular or Square End Chip Components – 1, 3 or 5 Side Terminations.I am not sure whether is applicable for crystal oscillator or not . Your answer would be highly appreciable Tue, 19 Jul 2016 11:10:04 GMT Soldering in electronics (R.J. Klein Wassink) http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18889 Hello, Unfortunately I have lost my hard copy of "Soldering in electronics" by R. J. Klein Wassink. Is it possible to purchase electronic copy of the book on the net? Having googled a couple of hours, I have found nothing. Any input is highly appreciated. Thank you in advance. Regards, Pavel Tue, 19 Jul 2016 08:48:34 GMT Used auto printer; any to avoid? http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18827 Our company is looking to upgrade from a dek249 semi-auto printer to an automatic inline printer since we're doing some fine pitch packages which are tricky to line up, and we'll soon be tackling bga's for our products. We're looking on the used market exclusively; we can't afford new machines. We would prefer a smaller foot print machine to save space. Some models that we are considering are dek 265gsx and mpm up2000. Does anyone have thoughts on these models or specific used machines to avoid in our search? Sat, 16 Jul 2016 18:40:12 GMT Speedline Accuflex issue http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18865 We just pulled a Speedline Accuflex printer out of storage. After programming a board and stencil, and calibrating the fiducials and everything, we do a test alignment and bring the board to print height. It is off. I've done it now with two different PCBs and stencils. The stencil is shifted slightly to the rear, so it prints just a bit of paste off the pad, closest to the operator. It's the same on all pads, so it's not a skew issue. I assume there's a camera calibration. I did the one where you align the screw head in the view, but it still aligns off. Also, when in the fiducials screen, I look at the PCB, and then the stencil. I can hear the camera move. After alignment, they should be the same, yet it makes a slight adjustment in order to center both in the screen. Any help would be appreciated. Sat, 16 Jul 2016 17:29:50 GMT PCB Design- traces (copper) under components http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18883 Fri, 15 Jul 2016 16:41:59 GMT MSL http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18872 How the moisture is not effecting the moisture sensitive devices after board assembly solder process when kept inside a cabinet with IP 20 rated? Fri, 15 Jul 2016 12:02:45 GMT