Harold Hyman has been involved in metallurgical aspects of the electronics industry since the 1950's, and in semiconductor development and engineering for STL, Ediswan & RCA. He later joined HTC, a pioneer of vapor phase soldering and continued industry experience Dynapert, GenRad, Teradyne, SRT and VJ Electronics.
Harold Hyman has submitted responses to the following questions.
Rework or Repair
It is all a question of definition.
We define these activities as follows:
REWORK -- an operation that is carried ...
What is Causing Oxidation?
Initial observation is that the blackening of the silver is more likely due to the creation of Sulphide rather than ...
Cause of Solder Icicles
Since the icicles are appearing on "some leads" and not all of them, the problem is more likely to be ...
Cleaning PCB's of Oxidation
Presumably, the "bare PCB's" have copper surfaces with no protective coating. Even so, it is a good idea to subject ...
Lifted Leads on QFP
At all times during the handling and processing of QFPs, special care must be taken to make sure that all ...
Organic Flux Residue Concerns
It depends on the nature of the "organic flux residues."
Pure rosin can be described as "organic" but its residues ...