Rohde & Schwarz 1138.4000, Service Manual

Page: 101 / 213

Radio Unit R&S CRTU-RU Module Replacement
1140.0050.82 3.27 E-4
Making the memory modules accessible
¾
Unscrew the two countersunk screws on the cover of the PCMCIA INTERFACE and carefully pull out
the option from the FRONT MODULE towards the front.
¾
Place the FRONT MODULE onto a clean surface with the aluminum panel pointing downwards.
¾
Unscrew the four screws on the mounting plate at the top, bottom and right and carefully swing away
the mounting plate towards the rear.
¾
Pull off the connecting cables to the LCD, DC/AC illumination converter, keyboard membrane and
spinwheel.
Note: When pulling off the connecting cables be careful with the cable connecting to the
keyboard. It is a film cable which can only be disconnected after sliding up the lock of the
film cable plug. Besides, be careful with the ribbon cable connecting to the spinwheel. First
loosen the locking brackets of the plug.
Removing the memory module
¾
Remove the old module: Carefully bend the lateral brackets towards the outside and pull out the
memory module.
Installing the new memory module and completing the instrument
¾
Insert the new module: insert the memory module into the slot, slightly press towards the rear and
engage the brackets on the sides.
Note: The memory modules can be obtained with the size 256 MB (spare part list, Current No.
290). It is possible to insert two of these modules, even of different size. First fit slot 1 (U3)
and then slot 2 (U2).
¾
Carefully plug the cable connectors to the controller board without reversing the polarities and
replace the mounting plate in the reverse order.
¾
Install the old PCMCIA INTERFACE in the FRONT MODULE in the reverse order.
Note: Make sure to route the cables of the PCMCIA INTERFACE properly, not to catch them and
insert them on the MOTHERBOARD before sliding the FRONT MODULE completely into
the CRTU Radio Unit.
¾
Complete the instrument without causing damage to the cables.
Putting into operation
¾
Connect the instrument to the mains and switch on. The built-in FRONT MODULE CONTROLLER
registers on the LCD. The BIOS is factory-set to th e CRTU Radio Unit.
¾
If required, supplement the BIOS Setup as follows:
•
Connect external keyboard to keyboard connector on the rear panel of the CRTU Radio Unit.
•
If the message 'CMOS Memory Size wrong, RUN SETUP, Press F1 to resume‘ appears, press
the F1 key.
•
Quit the BIOS setup using the ESC key and the RETURN key.
The CRTU Radio Unit starts the operating software automatically and is ready for use and can be
operated as usual.