Marc Peo

Marc Peo has submitted responses to the following questions.

Reflow Oven - 5 Zone or 8 Zone
This is one of those questions with multiple answers as the question can be interpreted in multiple ways: 1) Read ...

Is Component Lead Damage Reparable?
Maybe not the answer to the specific question (I don't know if the IPC standards allow for touch ups) but ...

Conformal Coating in Nitrogen Environment
In general we have not seen many conformal coat applications that benefit from nitrogen. So, in general, it is probably ...

Tiny Solder Balls After Reflow
Not easy to reach conclusions without seeing the product and having a few other details but looking at the information ...

Solution for Grape Effect
See a solution offered by D. Ron Lasky from indium. 4. Likely solutions: a. Use a square aperture. An square ...

Type 4 Solder Ball Use
Purely from the standpoint of the Reflow oven and the soldering operation, type 4 paste has a greater surface to ...

Tombstoning Dilemma
There is much "prior art" on the subject of tombstoning and many different variables and causes. ...

Reflow Oven in a Class 1000 Cleanroom
Sorry to answer your question with more questions there are some loose ends that would need to be tie up ...

SMT Component Shift
A great question that spawns other questions and hopefully an answer. Here goes: 1. First, we need to confirm that ...

Through Hole Soldering on 24 Layer Board
I am not an "expert" in this area but in my experience this is typically a function of pre-heat. Soldering ...

Wetting Problem SAC finished component
We would really need to know the temperatures and profile parameters being used but in general: Since the lead free ...

Requirements for 01-005 assembly
01005 is not a dramatic departure but there are some basic guidelines that can be helpful:Stencil cannot be too thick ...

Carbon Dioxide generated and trapped by conformal coating
Not 100% certain of the details on this particular urethane material but we have seen issues when conformal coating is ...

Concerns with HDI
Take a look at Introduction to High Density Interconnection Substrates and Microvia Technologies authored by Happy Holden, TechLead Corp. ...

Flux Deposition
It's hard to say for sure without seeing the location of the non-soldered joints and analyzing some of their characteristics ...

Part Movement During Reflow
This was a good question and one that interested me greatly so I contacted some of the component manufacturers and ...

Reflow for leaded and lead-free assemblies
This question is an important one for Wave solder as pot contamination can be a big issue. But on the ...

Tombstone problems
This is a tough one. Frankly, we have never seen this before so I am not "expert" in this area. ...

Should we buy new low cost assembly equipment
Pros: 1) Low cost Potential Cons: 1) Reliability - machines may not be proven over years of production 2) Lack ...

Books or Publications of today's
Here are two links that might be helpful. SMTA Bookstore IPC If there are any questions or if additional information ...

Cleaning solvent to replace Forane 141b?
Personally I don't have a clue but when I searched Forane 141b on the internet about 100 pages came up ...

Wave solder and reflow 0805 capacitors and resistors
What you will find in SMT is that there is basically one rule: there are no "rules". What I mean ...

Lead-free soldering problem
Some thoughts on this: 1) It's hard to come to solid conclusions on profile without seeing it. In other words, ...

Lead-Free Reflow Soldering
This is a tough one without knowing more information about the variables including --the details of the profile you are ...

Hand soldering skills
There are several services and companies out there. One is Soldering Technology International. ...

Reflow oven profiles
To a large degree, this one goes back to the old days of IR (Infra Red) Reflow soldering. In those ...

Reflow oven profilers
Your move to buy a profiler is probably a smart one. Up to this point your company has probably been ...

Remove and replace a 240 pin connector
The key to a job like this one is Pre-Heat. A board of this thickness will just heat sink away ...

RoHS tantalum capacitors burning during functional test
We have seen several situations where capacitors can fail if the internal core temperature of the cap goes above 150 ...

Can I upgrade my Long wave IR/convection oven for use with lead-free?
Typically a statement like "IR cannot be used for Lead Free" will have some kernel of truth or a valid ...

Regarding Lead Free, can i use the reflow ovens i currently have in production?
As with any equipment related conversation there is selling and there is engineering and sometimes the line between the two ...

Can I use my old oven for lead-free reflow?
There is a popular debate these days about the number of zones needed to successfully process lead free solder. Frankly, ...

Is it possible to run Pb-Free reflow without nitrogen?
The quick answer is DEFINITELY! The Japanese have been running Lead Free without nitrogen since 1999 with great success. Virtually ...

Are equipment companies mandated to meet lead-free requirements?
We have recently gone through this exercise as well. Some thoughts and feedback: 1) As with anything there is room ...

Advise and suggestions for assembly using 01005 capacitors.
Some thoughts from a Reflow perspective: 1)Paste will probably need to change to a version with smaller balls. Sony in ...