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R&S ZVB
Board Replacement
1145.1078.82 3.41
E-1
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
¾
Turn off the instrument and disconnect from the mains, screw off the 4 rear-panel feet (460) and
pull off the enclosure (400) backwards.
¾
Remove the instrument base cover (297) after undoing the 12 countersunk screws (299).
¾
Disconnect the RF cable and the 12 pin control cable from the LO divider.
¾
Remove the 2 screws (128) and remove the LO divider.
Installing the board and reassembling the instrument
¾
Insert the new board into the instrument and secure with 2 screws (128).
¾
Reconnect the RF cable and the 12 pin control cable.
¾
Fit the instrument base cover (297) and secure with 12 countersunk screws (299).
¾
Push the enclosure (400) back on and screw the 4 rear-panel feet (460) into position.
¾
Connect the mains cable and turn on at the mains switch. The instrument is now in the standby
mode
¾
Select Service Level 2 (see Service Functions).
¾
When the instrument has been started, check the protocol file for errors:
[ INFO : Error Log ]
¾
Record the receiver correction data (see
Recording Correction Data
).
¾
Perform factory system error calibration (see
Factory System Error Calibration
).
Содержание ZVB 4
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