R&S CMU MODULE Replacement
1100.4903.82 3.51 E-5
Replacing the Option OCXO REFERENCE OSC. R&S CMU-B11 or
R&S CMU-B12
(see chapter 5, spare part list, Current No. 2205 (OCXO REFERENCE OSC. CMU-B11), 2206 (OCXO
R
EFERENCE OSC. CMU-B12) and explosion drawing 1100.0008.01 D sheet 2)
The Option OCXO REFERENCE OSC. is fitted at the right side panel below the instrument fan in the
R&S CMU. For replacement proceed as follows:
Opening the instrument and removing the OPTION OCXO REFERENCE OSC.
Switch off the instrument, 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.
Place the instrument onto the left side, locate the OPTION OCXO (see chapter 5, explosion drawing
1100.0008.01 D sheet 2) and unscrew the two combi screws on the module support and one combi
screw on the MOTHERBOARD1.
Pull off OPTION OCXO REFERENCE OSC. from the MOTHERBOARD1 connector, slightly tilt and
swing out towards the bottom.
Installing the new OPTION OCXO REFERENCE OSC. and completing the instrument
Install the new OPTION OCXO REFERENCE OSC. in the reverse order. Tighten the three combi
screws again.
Note: Make sure that the 10-pin connector to the MOTHERBOARD is inserted correctly.
Complete the instrument without causing damage to the cables.
Manual OCXO adjustment
Connect the instrument to the mains and switch on.
Check the frequency accuracy and, if necessary, perform manual OCXO adjustment as described in
chapter 2.
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