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However, most press-fit connectors are designed to be reworked that is, repaired or replaced In some cases, individual leads or contacts can be replaced In other cases, banks of leads or contacts can be substituted Some press-fit connectors require complete removal of the damaged connector for replacement with a new one Many different press-fit connectors are on the market, and each has its own manufacturer-recommended repair strategy Press-fit assemblies are generally designed to accommodate at least two connector replacement cycles The two cycles are predicated on (1) the normal force exerted by the press-pin s compliant section on the PWB s plated through-hole barrel wall, and (2) the quality and condition of the PWB s plated through-hole barrel surface after subsequent press-fit connector removals and replacements..

Were the normal force of the compliant section on the PTH barrel of a press-pin excessive, it might cut through the barrel and even damage surrounding innerlayer interconnects or traces Instead, the normal force is optimized to permit gas-tight seal without excessive deformation or deep skiving of the plated through-hole barrel Once a connector or connector pin is replaced, the new connector/pin must result in a gas-tight pin-to-barrel seal for reliable contact Each time that a new press-pin is inserted into a plated through-hole, there is opportunity for the barrel to deform; the more insertions into the barrel, the deeper the deformation It is for that reason that the industry standard design goal for compliant pin connectors is generally targeted at only two replacement cycles Beyond two replacements, there is the possibility that the barrel will be thinned and damaged, impairing press-pin contact reliability or compromising the trace-to-barrel interconnection.

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61 62 63 64 Explain the different principles of lubrications What is the main difference between a capillary restrictor and an orifice restrictor State the advantages and disadvantages of hydrostatic bearings The four pads in Figure 667 have dimensions of a = 60 mm, b = 90 mm, c = 15 mm Oil feeding is through a capillary resistor with dimensions of dR= 085 10 3 m, l = 865 10 3 m, hd = 00508 10 3 m and other relevant data being h = 0345 Ns/m2, p1 = 155 10 6 and n = 127 m/s Calculate the inflow resistance, outflow resistance, pocket pressure, thrust per pad and the radial stiffness of this bearing using the equation:

Press-pin rework tools vary greatly In some cases, they are designed to remove and replace a single pin In other cases, the tool may be designed to help dislodge an entire connector from a circuit board Some tools are designed to remove the molded connector body only Then individual pins are pulled by pliers one by one in preparation for replacement Sometimes multiple press-pin ground or power leads are stamped into discrete wafers, and then the wafers are inserted into the plastic molded connector body to form a single press-fit connector In this case, individual wafers can sometimes be removed and replaced rather than having to replace single leads or the entire connector Repair tools and repair strategies are generally available from the connector manufacturer.

To avoid damage to the board, components, or solder joints, the PWB must be supported so that it is not flexed during press-fit component removal or replacement It is a good practice to verify circuit integrity by electrical test before and after repair to ensure that it is not degraded as a consequence of the repair cycle If a connector is replaced because of pin stubbing on the surface of the circuit board upon the original installation, ensure that the surface and underlying traces of the circuit board have not been damaged by the errant lead (see Fig 4913)..

LCD displays are very useful for displaying user information and communication. LCD displays are available in various formats. Most common are 1x16, i.e., 1 line with 16 alphanumeric characters. Other formats are 2x16, 1x40, 2x40, 4x16, etc. The LCD displays have the following format:

FIGURE 49.13 (a) Misaligned pin stubbing on the surface of the PWB. (b) The stubbed pin has folded under the connector. Stubbing may damage the PWB surface or subsurface traces.

Clearance for Press-Fit Tools for Assembly and Rework To avoid process problems and damage to adjacent components, there should be sufficient clearance in the PCA design to permit room for the pressing tool, board supports, and use of any associated rework tools.

a b c dR l hd h p1 = = = = = = = = = 60 mm 90 mm 15 mm 085 10 3 m 865 10 3 m 00508 10 3 m 0345 Ns/m2 155 10 6 N/m2 127 m/s

Long Pins Preferred When possible, use press-pin contacts slightly longer than the board thickness so that connector pins will protrude on the bottomside of the board after the pressing cycle. Pin protrusion permits easy inspection of the finished assembly. A missing pin is evidence of pin stubbing or buckling.

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