CSL EM941, Service Manual, Page: 25 / 40

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Test flowchart of incoming call with no ring.
Cancel
libration /mute
mode
Can test output sound signal at
L203/L204 by oscillograph when bell
works
No sound of bell
Remove headphone
and test it by
multimeter’s beep
function. If there is
sound like ‘sasa’ from
headphone
NO
NO
NO
YES
YES
YES
YES
Replace bell
components
If it is libration / mute
mode.
If volume level is
lowest
Turn up the volume
Replace
U101/MT6235/U201
NO
Use *#84666*# No. 7
to hear if bell has
sound
NO