Frontpanel Board2 (At The Front Of The Instrument Frame); Rearpanel Board (Interface Board For Further Connectors At The Rear Of The Instrument Frame) - Rohde & Schwarz CRTU-RU Service Manual

Radio Unit R&S
CRTU-RU

FRONTPANEL BOARD2 (at the front of the instrument frame)

Opening the instrument and removing the FRONTPANEL BOARD2
Switch off the instrument and pull the mains plug and unscrew the rear-panel feet.
Place the instrument onto the front carrying handles, push the tube upwards and take off.
Remove the FRONT MODULE as described above.
Unscrew the three countersunk screws of part of the mounting plate in the front frame at the bottom
and the top, loosen the ribbon cable from MOTHERBOARD1 and the MMCX coax cables (using a
∗
pull-out tool ) on the option (if installed).
Loosen the two interface screws on part of the mounting plate as well as the connector of the
interface cable on the FRONT MODULE and take out the FRONTPANEL BOARD2.
Installing the new FRONTPANEL BOARD2 and completing the instrument
Install new FRONTPANEL BOARD2, fasten with screws and connect all connectors and modules in
the reverse order.
Complete the instrument without causing damage to the cables.
Connect the instrument to the mains and switch on.
REARPANEL BOARD (Interface Board for Further Connectors at the Rear of the
Instrument Frame)
Opening the Instrument and removing the REARPANEL BOARD
Switch off the instrument and pull the mains plug and unscrew the rear-panel feet.
Place the instrument onto the front carrying handles, push the tube upwards and take off.
Slightly lift the cover at the top of the instrument after unscrewing the two countersunk screws on the
left, slightly shift to the right and lift off.
Place the instrument onto the left side.
Disconnect the two ribbon cables of the REARPANEL BOARD from MOTHERBOARD1.
Unscrew the 6 combi screws of the rear-panel cover and disconnect all coax cables of the BNC
connectors at the respective modules. Disconnect any option connectors mounted on the integrated
rear panel. Pull the rear panel towards the rear.
Loosen all interface screws to the REARPANEL BOARD on the integrated rear panel and take out
REARPANEL BOARD.
Installing the new REARPANEL BOARD and completing the instrument
Install new REARPANEL BOARD, fasten with screws and connect all connectors in the reverse
order.
Complete the instrument without causing damage to the cables.
Connect the instrument to the mains and switch on.
1140.0050.82 3.51
Module Replacement
E-4