4. Replacing Assemblies - Disassembly and Reassembly
To Remove A17 CBT Assembly
168
To Remove A17 CBT Assembly
The following procedures provide information required to remove and replace
the Long-Life (10890A) or high-performance (10891A) Cesium-Beam tube.
NOTE
During CBT replacement it is advisable to check (and if necessary
adjust) the VCXO set-point. Refer to procedure 3.9.1.8 in chapter 2.
Preparation
If any questions about operation and programming arise while performing the
procedures in this section, refer to the 5071A Operating and Programming
Manual (part number 05071-90041).
With power still applied to the instrument do the following:
1 Connect a terminal or printer to the RS-232C port and configure for serial
data communication to monitor and record the power-up sequence after
installation is complete.
2 Set 5071A serial communications parameters so that they match the
printer/terminal connected.
3 Set 5071A Diagnostic Log mode to “Service.”
4 Save the settings in 5071A memory using the Store function.
5 Check that communication works by selecting Info/Print and pressing
Enter.
6 Leave the printer connected during the next steps.
10890A or 10891A CBT Removal
1 Remove all power from the instrument and disable the internal battery by
momentarily pressing the Battery Disconnect switch.
2 Use a TORX® T10 driver to remove the four rear feet from the
instrument.
3 Use the TORX® T15 driver to remove the bottom and top covers, being
careful to “work” the covers toward the rear of the instrument. This “push
and turn” process will prevent the cover screws from being stripped.
To Next Page
Loading...
Need help?
General
