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Instrument Construction and Function Description
R&S ZVB
1145.1078.82 3.28
E-4
Replacing LCD A70 and the DC/AC Converter
(See Chapter 5, Spare Parts List Items 910, 930 and drawings 1145.1290, 1145.1384)
The LCD and the associated DC/AC converter are accommodated on a mounting plate. The connection
to the front module controller is made with cables which should also be replaced individually. The
replacement procedure is as follows:
Opening the instrument and removing the front unit
Turn off the instrument and disconnect from the mains.
Remove the 4 screws in the front handles (410), left and right, and take off the front handles.
Remove 3.5 mm connection cables (only with option R&S ZVBx-B16)
Remove the countersunk screw (390) next to the display and pull off the front cover (300 to 330)
forwards.
Remove the 2 countersunk screws 610) in the top of the frame and the 2 in the bottom.
Remove the countersunk screws (176) (4 ), (177) (6 ), (178) (8).
Pull out the front unit together with the keyboard and display (600, 601, 602, 603) forwards.
CAUTION
The cables to the front module controller are still connected
Disconnect the cables to the LCD, the DC/AC illumination converter, the key pad (keyboard), the
tachogenerator and, if necessary, the network connection to the front module controller.
Note:
When disconnecting cables, be especially careful with the cable to the keyboard. It is a
foil cable and can only be removed when the locking device on the foil-cable connector
has been released.
Place the key-side of the front unit on a clean surface.
Removing the DC/AC converter
Disconnect the cable from the display (910) to the DC/AC converter (930).
Disconnect the converter cable (950) to the DC/AC converter (930)
Remove the DC/AC converter (930) by undoing the 2 screws (940)
Removing the LCD
Disconnect the display cable (945) by cutting through the adhesive label(946).
Remove the display connector (1020) after you have undone the two screws (1040).
Disconnect the display cable (1030) at the display (910).
Remove the display (910) after removing the 4 screws (920)
Содержание ZVB 14
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