R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.53 E-4
Replacing Frequency Reference Board A100
(
See Chapter 5, Spare Parts List, Item 120 and drawings 1145.1010, 1164.1770)
Opening the instrument and replacing the board
Turn off the instrument and disconnect from the mains, screw off the 4 rear-panel feet (460) and
pull off the enclosure (400) backwards.
Lift off the instrument top cover (296) after undoing the 23 (2 ports) or the 28 (4 ports) countersunk
screws (298).
Extract the frequency reference board (120).
Installing the board and reassembling the instrument
Insert the new board into the instrument
Refit the instrument top cover (296) with the 23 (2 ports) or the 28 (4 ports) countersunk screws
(298).
Push the enclosure (400) back on and screw the 4 rear-panel feet (460) into position.
Connect the mains cable and turn on at the mains switch. The instrument is now in the standby
mode
Select Service Level 2 (see Service Functions).
When the instrument has been started, check the protocol file for errors:
[ INFO : Error Log ]
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