4. TROUBLE SHOOTING
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4.7. Microphone Trouble
• Microphone Signal Flow
• Check Points
– MIC is enable by MICBIAS
– Microphone bias
– MICBIAS, MICP, MICN signals from ABB
– Audio signal level of the microphone
– Soldering of components
• Trouble Shooting Setup
• Trouble Shooting Procedure
– Initialize GSM MS test equipment.
– Check the bias of the microphone.
– Connect PIF-UNION to the phone, and power on.
– Check the audio signal path.
– Make a test call.
– Check the soldering.
– Make a sound in front of the microphone.
– Check the microphone.
IOTA
U101
MICN
C221
MICP
MICBIAS
MIC
R214
R219
C220
R222
C224
C222
R217
MIC Bias
R214
MICN
MICP
Block Diagram
Summary of Contents for L1150
Page 1: ...Service Manual Model L1150 Service Manual L1150 P N MMBD0034601 Date June 2004 Issue 1 0 ...
Page 3: ......
Page 18: ...3 H W Circuit Description 17 Figure 1 Receiver Part Block Diagram ...
Page 42: ...3 H W Circuit Description 41 A BaseBand Components Component Side ...
Page 102: ...5 DISASSEMBLY INSTRUCTION 101 5 DISASSEMBLY INSTRUCTION 2 1 1 2 ...
Page 103: ...5 DISASSEMBLY INSTRUCTION 102 1 2 3 ...
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Page 113: ...7 BLOCK DIAGRAM 112 Baseband Part 7 BLOCK DIAGRAM The Block Diagram of the Baseband Part ...
Page 122: ... 121 9 PCB LAYOUT ...
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