TCU E65 US: Correct volume

Important!

This service function may only be run in certain cases. The instructions of the test module must be complied with.

This service function may only be run if the four conditions below are net at one time:

1. The customer has complained that the volume of the hands-free system has become quiet after a workshop stay.
   
2. The variant of the fitted TCU control unit is ”E65 US”.
   
3. The orginal part number of the TCU control unit located on the TCU label in the first line is the same as one of the following numbers:
   
   • 84 11 6 934 101-XX
     
   • 84 11 6 935 268-XX
     
   • 84 11 6 937 678-XX
     
   Note: This label can be found in two places:
   
   • in the User's Manual of the telephone
     
   • on the back of the TCU control unit. If necessary, the TCU control unit must be removed in order to allow the label to be read.
     
4. This service function has not yet been run on this control unit.