Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.52 E-4
Replacing LO Divider A600
(
See Chapter 5, Spare Parts List, Item 125 and drawing 1145.1010)
The board is located under the motherboard.
Opening the instrument and removing 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.
Remove the instrument base cover (297) after undoing the 12 countersunk screws (299).
R&S ZVB20: Remove the reflectometer units
Disconnect the RF cable and the 12 pin control cable from the LO divider.
Remove the 2 screws (128) and remove the LO divider.
Installing the board and reassembling the instrument
Insert the new board into the instrument and secure with 2 screws (128).
Reconnect the RF cable and the 12 pin control cable.
R&S ZVB20: Reinstall the reflectometer units
Fit the instrument base cover (297) and secure with 12 countersunk screws (299).
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 ]
Record the receiver correction data (see Recording Correction Data).
Perform factory system error calibration (see Factory System Error Calibration).
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