Motorola D10 Service Manual page 134

BenQ
7.Speaker
a) Components shift 1. Disassembly to visually inspect the
no function
b) U3 is at fault
8.Micphone a) Components shift 1. Disassembly to visually inspect the
no function
b) U3 is at fault
c) Other
components are at
fault.
LS1. If the spring of the LS1 becomes
deformed and doesn't contact well with
PCB pads, replace the LS1.
2. Visually inspect the R73, R74,
C39,C40, C41. If any component isn't
contacted well, shift it back to the right
position.
3. If they are not shifted, proceed to b
1. Measure the waveforms of the R73
and R74. If the R73 or R74 pins don't
output any signal when speaker
function is executed, U3 is at fault.
X2. If the cover of the X2 is not
matched with the microphone hole or
microphone doesn't contact well with
PCB pads, replace the cover of the X2
or microphone.
2. Visually inspect the R50, R51, C44,
C45, R43, R44, R47, C42, C43 and
U14. If any component isn't contacted
well, shift it back to the right position.
3. If they are not shifted, proceed to b
1. Measure the waveforms of the R50,
R51, and R43. If the R50 or R51 pins
don't output any signal or Micbias
voltage level is not equal 2~2.5V when
micphone function is executed, U3 is
at fault.
2. If it is not at fault, proceed to c.
1. Measure the waveforms of U14.5,
U14.1, U14.4 and U14.3 when
micphone function is executed.
2. If any pin is no signal, replace the
U14.
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Rev 1.0