IPC A 610 COMPREHENSIVE EXAM
QUESTIONS AND CORRECT ANSWERS
STUDY GUIDE
●● Connection Mounting - Orientation
Answer: Inspection usually starts with a general overall view of the
electronic assembly, then follows each component/wire to its
connection, concentrating on the lead into the connection, the connection
and the tail end of the lead/wire leaving the connection. The wire/lead
protrusion step for all lands should be saved for last so that the board can
be flipped over and all connections checked together.
●● *Component Mounting - Orientation - Horizontal
Target - Class 1,2,3
Answer: Nonpolarized components are oriented so that markings are
read the same way (left-to-right or top-to-bottom)
●● Component Mounting - Orientation - Vertical
Acceptable - Class 1,2,3
Answer: - Polarized part is mounted with a long ground lead
- Nonpolarized component markings read from bottom to top
●● Component Mounting - Lead Forming
,Defect - Class 1,2,3
Answer: Lead is kinked
●● Component Mounting - Lead Forming - Space between Seal/Weld
and Bend
Acceptable - Class 1,2,3
Answer: Leads of through-hole mounted component extend at least one
diameter or thickness but not less than 0.8 mm [0.03 in] from the body,
solder bead, or lead weld
●● Component Mounting - Lead Forming - Space between Seal/Weld
and Bend
Defect - Class 1,2,3
Answer: Fractured lead weld, solder bead, or component body lead seal
●● Component Mounting - Lead Forming - Stress Relief
Answer: - With camel hump bends. Configuration incorporating a single
camel hump may have the body positioned off-center.
- Loop bends may be used if the location of the mounting holes prevents
the use of a standard bend if there is no possibility of shortening the lead
to any adjacent component lead or conductor. Use of loop bends may
impact circuit impedance, etc., and shall be approved by design
engineering
, ●● Component Mounting - Lead Forming - Stress Relief
Acceptable - Class 1,2,3
Answer: - Component lead exiting component body is approximately
parallel to major body axis
- Component centering may be offset as a result of the type of stress
relief bond
●● Component Mounting - Lead Forming - Stress Relief
Acceptable - Class 1
Process Indicator - Class 2
Defect - Class 3
Answer: Lead bends less than one diameter or thickness but less than
0.8mm [0.03 in] away from body seal
●● Component Mounting - Lead Forming - Damage
Acceptable - Class 1,2,3
Answer: No nicks or deformation exceeding 10% of the diameter, width
or thickness of the lead
●● Component Mounting - Lead Forming - Damage
Defect - Class 1,2,3
Answer: Heavy indentations such as serrated pliers mark
QUESTIONS AND CORRECT ANSWERS
STUDY GUIDE
●● Connection Mounting - Orientation
Answer: Inspection usually starts with a general overall view of the
electronic assembly, then follows each component/wire to its
connection, concentrating on the lead into the connection, the connection
and the tail end of the lead/wire leaving the connection. The wire/lead
protrusion step for all lands should be saved for last so that the board can
be flipped over and all connections checked together.
●● *Component Mounting - Orientation - Horizontal
Target - Class 1,2,3
Answer: Nonpolarized components are oriented so that markings are
read the same way (left-to-right or top-to-bottom)
●● Component Mounting - Orientation - Vertical
Acceptable - Class 1,2,3
Answer: - Polarized part is mounted with a long ground lead
- Nonpolarized component markings read from bottom to top
●● Component Mounting - Lead Forming
,Defect - Class 1,2,3
Answer: Lead is kinked
●● Component Mounting - Lead Forming - Space between Seal/Weld
and Bend
Acceptable - Class 1,2,3
Answer: Leads of through-hole mounted component extend at least one
diameter or thickness but not less than 0.8 mm [0.03 in] from the body,
solder bead, or lead weld
●● Component Mounting - Lead Forming - Space between Seal/Weld
and Bend
Defect - Class 1,2,3
Answer: Fractured lead weld, solder bead, or component body lead seal
●● Component Mounting - Lead Forming - Stress Relief
Answer: - With camel hump bends. Configuration incorporating a single
camel hump may have the body positioned off-center.
- Loop bends may be used if the location of the mounting holes prevents
the use of a standard bend if there is no possibility of shortening the lead
to any adjacent component lead or conductor. Use of loop bends may
impact circuit impedance, etc., and shall be approved by design
engineering
, ●● Component Mounting - Lead Forming - Stress Relief
Acceptable - Class 1,2,3
Answer: - Component lead exiting component body is approximately
parallel to major body axis
- Component centering may be offset as a result of the type of stress
relief bond
●● Component Mounting - Lead Forming - Stress Relief
Acceptable - Class 1
Process Indicator - Class 2
Defect - Class 3
Answer: Lead bends less than one diameter or thickness but less than
0.8mm [0.03 in] away from body seal
●● Component Mounting - Lead Forming - Damage
Acceptable - Class 1,2,3
Answer: No nicks or deformation exceeding 10% of the diameter, width
or thickness of the lead
●● Component Mounting - Lead Forming - Damage
Defect - Class 1,2,3
Answer: Heavy indentations such as serrated pliers mark
