Trouble Shooting Guide, Standard
4/00021-2/FEA 209 544/19 E 16(29)
4.7 The phone sounds strange
If there is a noise when the illumination is on, replace N750.
If there is distortion or the sound is “chopped”, measure VDIG (2.75 V) at R900 and R902, at
the pins close to D900.
If the voltages are incorrect, measure the resistance of R900 and R902 (10 kohms). Replace if
incorrect.
If the resistances are correct, send the unit on according to the local company directives.
If the voltages are correct, measure the resistance of R904 (1.0 kohms), R914 (0 ohm), R907,
R908 and R909 (100 kohms). Replace if incorrect.
If the resistances are correct, replace D900.
If the fault remains, send the unit on according to the local company directives.
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