CMU MODULE Replacement
1100.4903.82 3.45 E-4
Replacing the Option UNIVERSAL SIGNALLING UNIT CMU-B21
(see chapter 5, spare part list, Current No. 730 and explosion drawing 1100.0008.01 D sheet 2)
The OPTION UNIV. SIGN. UNIT is installed in the module support as plug-in module. For replacement
proceed as follows:
Opening the instrument and removing the OPTION UNIV. SIGN. UNIT
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 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.
½ Take out the module using the two levers on the right and left.
Installing the new OPTION UNIV. SIGN. UNIT and completing the instrument
½ Insert the new OPTION UNIV. SIGN. UNIT into the instrument in the reverse order.
½ Complete the instrument without causing damage to the cables.
½ Connect the instrument to the mains and switch on.
Automatic module data adjustment
½ During startup observe the display.
½ When three BEEPs can be heard, press the MENU SELECT key.
The version manager is started (see also chapter 4, Firmware update). The display includes the
menu item FIRMWARE UPDATE AFTER BOARD CHANGE.
½ Press the softkey to the left of the above mentioned menu item.
The automatic module data adjustment is performed under software control, firmware updates for
microprocessors and programmable devices being performed as well. This may take a few minutes.
After the adjustment has been terminated, the operating software starts automatically and the CMU is
ready for use and complies with the specifications.
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