Cup terminal is a common design for some pins and connectors. We solder the wire with the solder cup to make a reliable connection, but how to inspect the soldering quality to ensure the connection reliability? Below is the solder cup inspection criteria in IPC-620-A
Target - Class 1,2,3
• Solder cups having the wire(s) inserted straight in and contact
the back wall or other inserted wires for the full depth of
the cup.
Acceptable - Class 1,2,3
• Wire(s) inserted for full depth of cup, not in contact with
back wall and does not interfere with subsequent assembly
operations.
Defect - Class 2,3
• Solder cup altered to accept oversized wire or wire group.
• Wire placement interferes with subsequent assembly operations.
• Conductor strands cut or modified to fit into the terminal.
Defect - Class 1,2,3
• Strand damage exceeds allowance of Table 3-1.
