R&S ZVA8 - Replacing a Reflectometer RM67 A510 to 540

R&S ZVA Repairs
1177.5333.02 3.65 E-11
Replacing a Reflectometer RM67 A510 to 540
(See Chapter 5, Spare Parts List, Items 300 and 350 and drawing 1305.7002)
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).
 Disconnect the three cables to the coupler, the LO cable, the two IF cables and the 50-pin control
cable from the reflectometer.
 Loosen the captive screws (see1305.7002) and take out the reflectometer.
Installing the board and reassembling the instrument
 Insert the new board into the instrument.
 Screw in the captive screws.
 Reconnect any cables that have been disconnected.
 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).
 Perform the factory system error calibration (see Factory System Error Calibration).