R&S ZVA8 - Replacing Network Controller Board A130, A140

R&S ZVA Repairs
1177.5333.02 3.71 E-11
Replacing Network Controller Board A130, A140
(See Chapter 5, Spare Parts List, Items 100, 105 and drawing 1145.1010)
The board is in the upper section of the instrument.
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.
 Lift off the instrument top cover (296) after undoing the screws (298).
 Extract the network controller using the ejector lever
Fitting the board and reassembling the instrument
 Fit the new board in the instrument.
 Refit the top instrument cover (296) with screws (298).
 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 receiver correction data (see Recording Correction Values).
 Perform factory system error calibration (see Factory System Error Calibration).
 Align the DC inputs (see Aligning the DC Inputs).