Chapter 11 353
Assembly Replacement Procedures
RF Section E4446A, E4447A, E4448A
Replacement
1. Refer to Figure 11-31. Attach the A34 Mixer to the standoffs using
the three screws (1) removed earlier. Torque to 9 in-lbs.
2. Replace cables W93, W98, and W99. Torque to 10 in-lbs.
3. Replace flat flex cable W90.
4. Replace the front frame.
A35 Mixer Bias Board
Removal
1. Drop the front frame. See page 314 for instructions.
2. Refer to Figure 11-31. Remove flat flex cable W90.
3. Remove the four screws (3) that attach the A35 Mixer Bias board to
the bracket.
Replacement
NOTE The A35 Mixer Bias board must have a self-adhesive thermal pad
attached to the voltage regulator (the square black component near the
center of the board). This thermal pad transfers heat from the voltage
regulator in the back side of the board to the sheet metal chassis. When
replacing the mixer bias board, discard the old thermal pad and replace
it. To install a replacement thermal pad, peel off the protective cover
from the pink side of the pad and attach to the voltage regulator. Peel
off the other protective cover on the pad and carefully align the board
over the mounting holes and secure with screws.
1. Refer to Figure 11-31. Attach the A35 Mixer Bias board to the
bracket using the four screws (3) removed earlier. Torque to 9
in-lbs.
2. Replace flat flex cable W90.
3. Replace the front frame.
SW3 Switch
Removal
1. Drop the front frame. See page 314 for instructions.
2. Refer to Figure 11-32. Remove cables W89. W93, W94, and ribbon
cable W96.
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