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Maintenance
IMPORTANT: Remove all traces of solder flux or foreign material contamination from the circuit board contact
area before replacing the connector. Contamination usually takes place during the soldering and cleaning
process. Even when the soldering is done carefully, flux, oil, or other contaminants can be carried under the
connector during the cleaning operation. When the solvent evaporates, nonconductive contaminants may remain
on or near the contact interfaces.
Hand cleaning with solvent or machine cleaning in an automatic detergent wash is not recommended for boards
containing Hypcon connectors.
If a component near a Hypcon connector must be replaced, the following steps are recommended:
1.
Remove the hybrid IC and Hypcon connector (see Disassembly and Removal instructions) before any
soldering or cleaning and store in a dirt-free covered container. When several hybrids and Hypcon
connectors are to be removed, keep parts in sets and do not interchange parts between sets.
2.
Hand soldering:
a.
Use small diameter solder (0.030"-0.040").
b.
Use low-wattage soldering irons (15-20 watts).
c.
Use care with solder amount and placement.
3.
Remove solder flux and contact contamination with isopropyl alcohol or denatured ethyl alcohol.
4.
Flush the hybrid and Hypcon connector mounting area with isopropyl alcohol. Do not scrub with a cotton-
(
tipped swab, as cotton fibers will adhere to edges and surfaces of contact areas and cause open or
intermittent connections. The elastomer should be examined under light for dust, hair, etc., before it is re-
installed. If the etched circuit board surfaces require more cleaning, scrub with a soft rubber eraser and
blow or vacuum clean while dusting surface with a small clean brush.
5.
If the hybrid IC and elastomer contact holder are contaminated, clean the contact holder and hybrid by
flushing or spraying with alcohol and oven dry at 50° C. Do not scrub with a cotton-tipped swab or similar
device. If the contact holder is excessively contaminated, replace it with a new one.
Tighten the mounting screws with two-inch-pounds of torque to secure the Hypcon to the circuit board.
Make sure that the elastomer is properly seated in the contact holder before remounting the assembly to the
circuit board. Exercise care when mounting the frame-elastomer connector holder-hybrid IC assembly to the
circuit board to prevent misalignment between the connector and board.
CAUTION
Because of close tolerances involved, special care must be taken to ensure correct index alignment of
each Hypcon part during reassembly. Failure to do so can result in a cracked hybrid substrate. See
Figure
3-2
for index locations.
11A52 Extended Service Manual
3-7
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Troubleshooting
