Rohde & Schwarz 1138.4000, Service Manual

Page: 106 / 213

Module Replacement Radio Unit R&S CRTU-RU
1140.0050.82 3.32 E-4
Replacing the PCMCIA INTERFACE
(see chapter 5, spare part list, Current No. 500 (PCMCIA INTERFACE, and explosion drawing
1138.4000.01 D sheet 2 )
The PCMCIA INTERFACE is fitted on the FRONT MODULE. For replacement proceed as follows:
Opening the instrument and removing the FRONT MODULE
¾
Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
¾
Place the instrument onto the front carrying handles, push the tube upwards and take off.
¾
Unscrew the four screws of the front handles at the instrument frame on both sides and take off the
front handles.
¾
Unscrew a countersunk screw (if present) at the front on the labeling panel next to the spinwheel and
pull off the labeling panel towards the front.
¾
Unscrew two countersunk screws in the front frame at the top and at the bottom as well as two
countersunk screws at the front above the AUX1/2 BNC connectors.
¾
Unscrew a combi screw at the top of the module support for support of the PCMCIA INTERFACE.
¾
After unscrewing the two countersunk screws at the top left instrument frame slightly lift the cover at
the top of the instrument, slightly shift towards the right and lift off.
¾
Slightly push the FRONT MODULE from the rear to the front using little pressure.
Note: Note the three ribbon cables for the PCMCIA INTERFACE that are still connected to the
MOTHERBOARD1.
¾
After sliding out the FRONT MODULE disconnect the three ribbon cables from the
MOTHERBOARD1 connector.
¾
Take the FRONT MODULE completely out of the CRTU Radio Unit.
Replacing the option
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
Install the new PCMCIA INTERFACE in the FRONT MODULE in the reverse order.
¾
Install the FRONT MODULE in the CRTU Radio Unit 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 MOTHERBOARD1 before sliding the FRONT MODULE completely into
the CRTU Radio Unit.
Completing the instrument and putting into operation
¾
Complete the instrument without causing damage to the cables.
¾
Connect the instrument to the mains and switch on.
The built-in FRONT MODULE CONTROLLER registers on the LCD and starts the operating software.