14-18 Chapter 14
Assembly Replacement and Post-Repair Procedures
A3 Source Assembly
A3 Source Assembly
Tools Required
• T-15 TORX screwdriver
• 5/16-inch open-end torque wrench (set to 10 in-lb)
• ESD (electrostatic discharge) grounding wrist strap
• small slot screwdriver
• needle nose pliers
Removal
1. Disconnect the power cord and remove the top cover (refer to “Covers” on page 14-6).
2. Refer to Figure 14-8. Remove the source bracket (item 1) by removing four screws.
(It might be necessary to disconnect a flexible cable from the B sampler.)
3. Disconnect the flexible cable W26.
4. Disconnect the semirigid cable W1.
5. Lift the two retention clips (item 2) at the front and rear of the source assembly to an
upright position.
6. Move W1 to the side while lifting the source high enough to provide wrench clearance
for W24. To lift the A3 source assembly, use the source bracket handle (item 3).
7. Disconnect the semirigid cable W24.
8. Remove the source assembly from the instrument.
Replacement
1. Check the connector pins on the motherboard before reinstallation.
2. Slide the edges of the sheet metal partition (item 4) into the guides at the sides of the
source compartment. Press down on the module to ensure that it is well seated in the
motherboard connector.
3. Push down the retention clips (item 2). Reconnect the two semirigid cables (W1 and
W24) and one flexible cable (W26) to the source assembly.
NOTE When reconnecting semirigid cables, it is recommended that the connections
be torqued to 10 in-lb.
4. Reinstall the source bracket (item 1).
5. Reconnect the flexible cable to the B sampler.
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