Microphone Sometimes Does Not Work - Nokia 8910 Manual

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Microphone sometimes does not work

Pre-Check:
Make a call with a working phone. Speak into the faulty phone.
If nothing is hearable at the working phone, follow the repair instructions:
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Microphone sometimes does not work
If the microphone does not work, probably the flex foil to X100 flex connector is broken, the connector itself is faulty or
one of the components one the PWB does not work.
First try to change the grip module and test with a working one.
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Note! For disassembling instructions refer to service manual NHM-4 8910, chapter "Disassembly and Troubleshooting
Instructions"
If the problem is solved, probably the flex foil was broken or had no connection to the connector.
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Grip module I002
If the fault persists, check X100 flex connector for mechanical stress, broken solderings or interruptions.
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If the connector is ok but the microphone sometimes does not work, put the PWB into repair Jig MJS-39 and set
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phone with Phoenix Service SW to local mode. Enter menu Maintenance/Testing/Audio and Turn Loop on. Measure
at following pins of X100.
MIC: Pin 9 =2.1VDC (Loop on); 0V (Loop off)
XEAR: Pin 11 = 0.8VDC (Loop on); 0V (Loop off)
If on or both do not work, check lines and components between X100 and UEM for broken solderings or
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disconnections and change faulty ones.
© NMP 2003
CONFIDENTIAL
NHM-4/NHM-4NX 8910/8910i
Date 03.06.2003
See "Microphone sometimes does not work"
o
Checked by:
SCCE Training Group
9 (16)
Repairhints
Version 2.0 Approved
Flex foil with connector
Approved by:
SCCE