MODULE Replacement CMU
1100.4903.82 3.44 E-4
Replacing the Option OCXO REFERENCE OSC. CMU-B11 or CMU-
B12
(see chapter 5, spare part list, Current No. 690 (OCXO REFERENCE OSC. CMU-B11), 710 (OCXO
REFERENCE 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
CMU. For replacement proceed as follows:
Opening the instrument and removing the OPTION OCXO REFERENCE OSC.
½ Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
½ Place the instrument onto the front carrying handles, push the tube upwards and take off.
½ 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.
½ 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
½ 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.
½ Complete the instrument without causing damage to the cables.
Manual OCXO adjustment
½ Connect the instrument to the mains and switch on.
½ Check the frequency accuracy and, if necessary, perform manual OCXO adjustment as described in
chapter 2.
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