CONFIDENTIAL 9 (16)
NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
SCCE
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:
o See “Microphone sometimes does not work”
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.
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.
Grip module I002
Flex foil with connector
- If the fault persists, check X100 flex connector for mechanical stress, broken solderings or interruptions.
- If the connector is ok but the microphone sometimes does not work, put the PWB into repair Jig MJS-39 and set
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
disconnections and change faulty ones.
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