Success of new HP41c repair methods

With the help of Ingancio Sánchez, we have begun analyzing the failure modes of the HP41c, and we have been developing repair techniques for most of them. In the next articles, we will present the failure modes and the possible techniques in each case. 

• Corroded battery terminals
• Corroded main circuit
• overdone lower screw posts
• overdone upper screw posts
• Broken lower screw posts
• Broken upper screw posts
• Corroded or broken zebra connector
• Broken screw supports on the back side or the case (usually the upper ones)
• Missing back port
• Missing side port
• Corroded spring for battery holder
• Broken or missing battery holder
• In full nuts, overdone nuts to keep circuit pressure - an alternative to nuts.
• Broken plastic window

In next instances, we will go one by one with each of the chapters. Who knows, it may end up as a book!