Pad ROL™200 Series - Johnstech

Pad ROL200
Series
Figure 1: Example of a Load
Board Pad Pattern
Load Board & Contactor Inspection
Load Board Inspection
Johnstech recommends performing a thorough inspection of
the Load Board before initial installation of the Contactor, as
well as when performing routine maintenance. First, however,
verify your Load Board against the Load Board Drawing that
was sent to you either with your Quote or Order.
Next, check the Contact Land Pad Pattern for signs of wear
on the Gold. See Figure 1. If Nickel is showing, make sure
that it is not excessive. It is acceptable to utilize the Nickel
surface during testing; however, in some RF applications,
signal degradation will occur. Load Boards with wear that
extends deeper than the Nickel surface, through to the Copper,
can cause damage to the Contacts and Elastomers and should
be replaced or repaired.
NOTE: Excessive Load Board wear is typically caused by
Contact deflection or excessive force on the socket Housing.
Figure 2: Example of worn (vs.
not worn on right) Alignment
Plate Wall; needs to be replaced
Contactor Inspection
CAUTION: Use special care during the inspection process.
Excessive force can fracture the Housing Slots.
Figure 3: Example of backlit
Alignment Plate Wear Test
Figure 4: Examples of Tail
Stop Wall Wear
Before removing Contactor from the Load Board, use a minimum
of 10X magnification to inspect it for:
· Damaged, missing or excessively worn Contacts
· Debris and Mold Flash trapped around Contacts
· Cracks or chipping in the Housing or Alignment Plate
· Cracked, deformed or missing Contact Slot Walls
· Worn Alignment Plate (ALPL) Walls — see Figure 2.
Complete ALPL analysis is a more complex topic than can be
fully addressed here, but the following quick check-up may be
helpful.
NOTE: Remove Contactor from Load Board (per instructions
on Pages 14) to test for Alignment Plate (ALPL)
Wear. On a backlit surface, place device into the ALPL
opening and then push it to one corner (see Figure 3).
Use a Feeler Gauge Stock of 0.1mm, to check the gaps on
the opposite sides. If Feeler Gauge Stock slips in and out
of gap easily, the ALPL may need to be replaced.
· Worn handler Alignment Pin Holes (contact your Johnstech
representative for Bushings to reduce Contactor wear.)
If any of the above conditions are observed, Contactor Maintenance
and possibly Contact/Elastomer or ALPL replacement
is required.
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