Instrument Frame; Rear Of Instrument Frame; Front Of Instrument Frame - Rohde & Schwarz CRTU-RU Service Manual

Radio Unit R&S
CRTU-RU

Instrument Frame

The instrument frame consists of front frame, module support, partition, cage and air duct. The module
support is screwed to the front frame. It incorporates the partition, the cage and the air duct and
provides all mechanical connectors and slots for modules. The MOTHERBOARD for electrical
connection of the modules as well as the big fan for cooling the modules are screwed to the instrument
frame.

Rear of Instrument Frame

At the rear of the CRTU Radio Unit instrument frame, the power supply with integrated power plug and
switch as well as other important electrical interfaces are fitted (see the operating manual for the system
the CRTU Radio Unit belongs to). The power supply unit can be easily replaced.
A further rear panel that is screwed to the frame serves as support for further electrical interfaces and
optional extensions.

Front of Instrument Frame

The front of the instrument frame incorporates the FRONT MODULE, the most important electrical
interfaces as well as the PCMCIA INTERFACE drive including the power splitter.
FRONT MODULE
Electrical interfaces
1140.0050.82
Instrument Design and Function Description
The components of the FRONT MODULE that are directly arranged at
the front of the CRTU Radio Unit are the LCD and the operating keys
with the spinwheel.
The operating keys consist of a membrane and a mat inserted into the
keyboard frame of the FRONT MODULE. The operating keys are
colored differently to highlight their function and partly labeled.
This module can be conveniently replaced as a unit.
The beeper with sound outlet on the FRONT MODULE is used for
acoustic prompts and error warnings.
The electrical interfaces are mounted on an extra mounting plate. The
RF interfaces are components of the RF FRONTEND.
3.3 E-4