Electronics Forum: q-2 (Page 1 of 11)

PCB Coloring

Electronics Forum | Thu Jun 17 06:39:41 EDT 2004 | davef

Q1: Why are most common PCB's green? A1: Tradition Q2: What are the tradeoffs, ie electrical characteristics, etc for changing board colors? Q2: None. We use different colored solder mask on boards to indicate different development stages. See you

forming axial-lead for elavated horizontal soldering to SMT pad

Electronics Forum | Wed May 26 06:54:07 EDT 2004 | davef

Q1) if this is an acceptable component-lead modification? A1) Yes, it's acceptable Q2) and does this mod meet any existing IPC specs?(did a internet search but no result) Q2) IPC repair guidelines are: 7711A/7721A - Rework and Repair Guide For ot

Dewetting on QFP

Electronics Forum | Tue Jun 07 08:57:14 EDT 2005 | ktron

Hi there, I have questions regarding on dewetting issue.. Q1) How to identify on good or bad ICs lead that could contribute to dewetting? Q2) What actions that must be taken in facing this issue? Thank n regards,

high speed PCB frequency range

Electronics Forum | Thu Aug 04 10:38:23 EDT 2016 | richardlawson1489

Here is a video for high speed pcb design rule and techniques. https://www.youtube.com/watch?v=BlHLmQ2HO1w This may help you.

Fuji IP 2 Servo NG error?

Electronics Forum | Mon Mar 09 17:42:56 EDT 2009 | smellew

ok Please power on the machine & confirmed that M1CP 2 is ok this is the breaker for the 35V & check M1cp1 now look at the drawings at address 1011 & check the axis ready relays Z1 11CS3x 151-GB Closed is ok if open see address 5402 Z1 servo amp is f

bulk feeding chips

Electronics Forum | Wed Feb 26 17:05:42 EST 2003 | davef

Q1: Are the markings on resistors the actual value? A1: Generally, resistor marking indicates the value of the device, where the first two digits are the value and the third digit is the multiplier. Q2: Do AOI machines look for these markings or do

Are There Aftermarket Or Used Parts Sources??

Electronics Forum | Mon May 04 07:34:47 EDT 1998 | Scott Davies

Are there any vendors who sell aftermarket or used parts? I need the following: Finger cleaner pot for Electrovert Ultrapak 445 wavesolder machine. 856 flux ate right through it and Electrovert wants 2K for a new one. That's a lot for a 10" box! Ro

PCB Storage - WIP

Electronics Forum | Fri Jun 18 10:56:32 EDT 2004 | Cal

I am looking for some resources and opinions PCB storage racks. Currently, we use the typical oard rack that stands the PCB's up on edge. Q1)Where is a good source to get more of these? Q2)What are the alternatives to this style of board rack? (need


Electronics Forum | Wed Nov 08 08:27:40 EST 2006 | davef

Q1: What is leadfree soldering? A1: Look here http://www.niccomp.com/NIC_RoHS_WEEE_Update_0305_b.pdf Q2: Why is it preferred over the convention leaded soldering? A2: Eurolanders legislated it without proper investigation into the environmental a

Solder paste handing

Electronics Forum | Tue Jan 16 00:03:28 EST 2007 | Stephen- SMT engineer trainee

Thanks for you reply CL. For Q2, I want to know that is there are any ratio of mixing new or old soldering paste? Also, can we put the "working jar" and opened unused solder paste to refrigator and soft it by solder paste softer in next time of prod

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