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Instrument Construction and Function Description
R&S ZVB
1145.1078.82 3.30
E-4
Replacing Flexible switch board (Keyboard) A16 / Key Pad A15
(See Chapter 5, Spare Parts List, Items 860, 870, 875, 877 and drawings 1145.1010, 1145.1384)
The flexible switch board (keyboard) and key pad are located behind the front cover and the keyboard
frame.
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),right and left, 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 front 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) and place it with
the key-side on top of the instrument.
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
is released.
Removing the flexible switch board (keyboard) / key pad
Place the front unit with the key-side upwards on a clean surface.
Remove knob (990) from the tachogenerator.
Undo the 10 countersunk screws (890) and remove the keyboard frame (800, 801, 805).
The flexible switch board (860) and the key pad (870, 875) can now be replaced.
Installing a new flexible switch board / key pad and reassembling the instrument
Insert the new flexible switch board (860) into the keyboard frame (800, 801, 805) from behind.
N.B.:
The positioning pins must be inserted in the holes in the keyboard frame.
Place the new key pad (870, 875) on the rear of the flexible switch board (860).
Содержание ZVB 14
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