14-20 Chapter 14
Assembly Replacement and Post-Repair Procedures
A4, A5, A6 Samplers and A7 Pulse Generator
A4, A5, A6 Samplers and A7 Pulse Generator
Tools Required
• Needle-nose pliers
• T-10 TORX screwdriver
• 5/16-inch open-end torque wrench (set to 10 in-lb)
• ESD (electrostatic discharge) grounding wrist strap
Removal
1. Disconnect the power cord and remove the top cover (refer to “Covers” on page 14-6).
2. Refer to Figure 14-9. To remove the B sampler (A6), you must remove the source
bracket (item 1).
3. Disconnect all cables from the top of the sampler (A4/A5/A6) or pulse generator (A7).
4. Remove the screws from the top of each sampler assembly. Extract the assembly from
the slot.
NOTE To remove the A (A5) or R (A4) sampler, first remove the cable on the B (A6)
sampler.
NOTE If you are removing the pulse generator (A7), the grounding clip, which rests
on top of the assembly, will become loose once the four screws are removed. Be
sure to replace the grounding clip when reinstalling the pulse generator
assembly.
Replacement
1. Check the connector pins on the motherboard before reinstallation.
2. Reverse the order of the removal procedure.
NOTE
• When reconnecting semirigid cables, it is recommended that the
connections be torqued to 10 in-lb.
• Be sure to route W8 and W9 as shown. No excess wire should be hanging
in the A11 and A14 board slots. Routing the wires in this manner will
reduce noise and crosstalk.
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