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R&S ZVB
Instrument Construction and Function Description
1145.1078.82 3.41
E-4
Replacing a Reflectometer RM8 A510 to 540
(See Chapter 5, Spare Parts List, Items 165, 170, 175 and drawing 1145.1010)
The boards are 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 bottom instrument cover (297) after undoing the 12 countersunk screws (299).
Remove the 4 screws in the front handles (410), right and left, and take off the front handles.
Remove the countersunk screw (390) next to the display and pull off the front cover (300 to 330)
forwards
Remove the 2 screws (176, 177, 178) in the front of the instrument next to the port connector.
Disconnect the source cable, the LO cable, the two IF cables and the 50-pin control cable from the
reflectometer.
Remove the 2 screws (151, 156, 161) at the end of the reflectometer and take out the reflectometer
Installing the board and reassembling the instrument
Insert the new board into the instrument and reconnect any cables that have been disconnected
N.B.:
Use the lettering on the motherboard as an aid.
Screw in the 2 screws (176, 177, 178) in the front of the instrument next to the port connector.
Screw in the 2 screws (151, 156, 161) in the end of the reflectometer.
Fit the instrument base cover (297) and secure with 12 countersunk screws (299).
Replace the front cover (300 to 323) and secure with the countersunk screw (390).
Refit the 2 front handles (410) using 4 screws.
Slide 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 generator and receiver correction data (see
Recording Correction Values
).
Perform the factory system error calibration (see
Factory System Error Calibration
).
Содержание ZVB 14
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