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Assembly Replacement
AT1 Electronic Attenuator/RPP
AT1 Electronic Attenuator/RPP
Tools Required
• T-10 TORX screwdriver
• 5/16-inch open-end wrench
Removal
1. Remove the instrument cover. (Refer to "Instrument Cover" in this chapter.)
2. Remove the top cover by removing the 11 screws that secure it.
3. Disconnect W9, W13, and W14 from the electronic attenuator/RPP (AT1).
4. Remove the two screws (item 1) that attach the attenuator/RPP to the instrument chassis.
5. Tilt the attenuator/RPP away from the chassis wall, then carefully lift it out of the instrument.
Th
ere are two hinged tabs at the bottom of the attenuator/RPP which fit into slots in the instrument chassis.
Therefo
re, it is necessary to tilt the attenuator/RPP away from the chassis wall so that the tabs can be guided out
of the slots.
Replacement
1. Reverse the removal procedure and do the following:
• When reinstalling the electronic attenuator/RPP (AT1), remember to insert its hinged tabs into the slots located
at the
base of the chassis wall on which the attenuator/RPP will be mounted.
• Torque W9 and W14 to 9 in-lbs.
• Torque the two T-10 TORX screws to 9 in-lbs.
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