4OM-1003-007 - 第402页

5.3 T roubleshooting on Placement Errors 5.3.1 Cause and Remedy of Placement Errors (1) Positional and Angular Deviations of Component Placement (1-1) Situational Grasp of Error Generation Positional and angular deviatio…

• Checkpoints on Tape Feeder

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Fig. 4B33

Fig. 4B34

5.2 Troubleshooting on Pick-Up Errors

5.3 Troubleshooting on Placement Errors

5.3.1 Cause and Remedy of Placement Errors

(1) Positional and Angular Deviations of Component Placement

(1-1) Situational Grasp of Error Generation

Positional and angular deviations may be generated in either Process

C or D and E.

See Fig. 4B29.

By placing a component on the P.C.B. where a double-faced adhesive

tape is affixed, it can be checked and determined in which process

positional and angular deviations are generated.

When a positional deviation is generated on the double-faced tape, it

indicates that positional and angular deviations occur in Process C.

When no positional deviation is generated, it means that positional and

angular deviations occur in Process D or E.

(1-2) Positional and Angular Deviations in Process C

When a positional deviation is generated due to the movement of the

head after component recognition or a rotational deviation by place-

ment angle correction, the deviation may be caused mainly by the fol-

lowing two factors.

• Deterioration of Vacuum Suction Force

• Vibration or Shock during Nozzle (Head) Movement

When one of the above factors exists, unstable components (compo-

nents that cannot be picked up in stable condition) such as those shown

in Fig. 4B35 are directly affected.

When a positional deviation is generated on the components (the com-

ponents of the same type that have been used in the past actual pro-

duction), check for the above-described factors.

As for vacuum suction force, check the nozzle and the vacuum line.

As for vibration during nozzle movement, check the related spots in the

range of Process C.

Fig. 4B35 Easily-Dislocated Components during Place-

ment (Example 1)

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5.3 Troubleshooting on Placement Errors

(1-3) Positional and Angular Deviations in Process D or E

When a positional deviation is not generated on the double-faced tape,

it indicates that positional or angular deviation occurs in Process D or

As a phenomenon at this time

• The component is dislocated right after it is placed.

• The component is dislocated during operation subsequent to the place-

ment.

• The component is dislocated during P.C.B. discharge operation sub-

sequent to the placement.

The causes in the above cases lie in the factors affected commonly by

the shape of the component, the condition of the P.C.B., or the condi-

tion of solder paste or glue.

Fig. 4B36 is an example, which shows that a component is dislocated

right after it is placed due to the upper and lower surfaces of the com-

ponent not parallel to each other.

A force is generated and moves the component in the X direction at the

moment when the lower surface touches the P.C.B. during placement.

This leads to the positional and angular deviation of the component

placement.

When this type of component is used, this failure may be avoided by

slowing down the placement speed or slightly increasing the nozzle

descent level for the placement.

Some components may be dislocated easily during X/Y table move-

ment or P.C.B. discharge operation after they are placed.

The factor may be weak holding power of solder paste or glue or im-

perfect fixation of P.C.B.

It is required to check these conditions and take individual counter-

measures.

Fig. 4B36 Easily-Dislocated Component during Placement (Example 2)

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5.3 Troubleshooting on Placement Errors