R&S ZVA24, Service Manual

Page: 365 / 606

R&S ZVA Repairs
1177.5333.02 3.57 E-11
Replacing a Reflectometer RM8 A510 to 540
(See Chapter 5, Spare Parts List, Items 150, 160 and drawing 1145.1110)
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 screws (299).

Remove termination and 3.5mm connection cables (only with option ZVAx-B16)

Remove the screws (153), (154), (163), (164) in the front of the instrument next to the port
connector and (168) in case of port 4.

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, 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 screws (153, 154, 163, 164, 168) in the front of the instrument.

Screw in the 2 screws (151, 161) in the end of the reflectometer.

Fit the instrument base cover (297) and secure with screws (299).

Slide the enclosure (400) back on and screw the 4 rear-panel feet (460) into position.

Connect the mains cable, turn on at the mains switch and press the ON key.

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 in chapter 2).

Perform the factory system error calibration (see Factory System Error Calibration in chapter 2).