Table of Contents
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START
The voltage of R217
is 2.5V?
Yes
Soldering between
MIC and Board
is OK?
Yes
A few hundreds
of mV of signals are
measured ?
No
The MIC is out of order.
Change the MIC.
Connect the handset to
network equipment and
setup call.
No
No
Resolder the MIC
Check the signal level at pin
1,2 of the MIC after putting
audio signal into the MIC.
Yes
-63-
The soldering of R214
is OK?
Yes
ABB is out of order.
Change the board.
Yes
The soldering
of C220,C224,R219,
and R222
is OK?
No
Resolder the
R214
Resolder the
No
C220,C224,R219
and R222
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