Tektronix 11A52 Service Manual page 49

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Maintenance
Disassembly and Removal
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Notice index on circuit board (arrow) and plastic frame (pointed tab).
®
Unscrew and remove the 4 screw/washer assemblies.
@)
Lift plastic frame from board.
g)
Notice index location of hybrid and remove from circuit board with tweezers.
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NOTE
Step 5 describes the removal of the elastomer from plastic frame.
This step is not necessary when replacing only the hybrid.
Notice index location of elastomer contact holder and remove from plastic frame by grasping corner
with tweezers and lifting up. Do not touch the gold-plated contacts with your fingers.
Reassembly and Replacement
a. Grasp a corner of the elastomer with tweezers and place it into plastic frame. Align keyed corner of
elastomer with keyed corner of plastic frame. T):lmp elastomer into plastic frame uniformly.
NOTE
Cleaniness is very important. Small hairs and elastomer flash under the contacts,
which are almost invisible to the naked
eye,
will prevent good electrical contact. Most
apparent failures of the hybrid are actually due to contamination of the Hypcon. Do
not touch the the gold-plated contacts with fingers.
b. Place the hybrid into the square hole in circuit board. The hybrid is keyed so that it will fit into the
circuit board in only one orientation. When the back of the hybrid rests on the heat sink pedestal, the
top of the hybrid should be flush with the top of the circuit board.
c. Place the plastic frame with elastomer installed over hybrid such that key (pointed tab) aligns with the
corner arrow on the circuit board.
d. Insert mounting hardware and apply two inch-pounds of torque (2.3 cm-kg) to secure connector
assembly. Do not overtighten. To do so will strip the microcircuit stiffener/heat sink mounting threads.
Figure 3-2b. Details of Hypcon Connectors;
11A52 Extended Service Manual
7391-305
3-9