Seiko 7C17 User Manual download pdf (Page 24)

Slide Solder Defects:

Solder “Shorts” or “Bridges”:

Open

Angle

The iron tip is programmed with a

slight “OPEN” angle. This allows the

front of the tip to contact each terminal

and the rear edge of the tip to heat each

pad as the tip slides. The “OPEN”

angle minimizes the possibility for

bridges to occur as the entire tip surface

never contacts two pins simultaneously.

There are several factors that can contribute to a solder short or bridge. These factors include:

a) Flux void in wire core b) Wire feed position

c) Iron tip position d) Inconsistent lead location

e) Iron tip temperature f) Oxides, residual flux on tip (post clean)

If the robot is soldering well and then the quality becomes poor, the main reason is that something has

changed in the set-up. Most likely, the solder wire feed position has been accidentally moved or mis-

adjusted or was loose and has drifted out of position. Prior to making any programming changes, check the

set-up of the tip and feed position to ensure that they are correct.

The solder feed needs to contact the Tin electro-

plated area of the iron tip. Solder feed heights

above this area can cause major quality issues.

The solder feed height in the photo above illustrates

the proper height setting for feeding into a slide

solder tip.

Poor flux distribution on PCB. This was caused by

feeding solder too high on the tip above the Tin

electroplate, this caused the flux to burn away and

become in-effective. This problem was fixed by

lowering the feed position.

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Seiko 7C17 User Manual Page 24