5-2
Troubleshooting
YES
Check the signal level at the
U603, U604 Pin 5,6
after putting audio signal in MIC.
YES
Check the MIC.
The level is 2.0V?
MIC is not working.
Connect the Phone to
Wireless Communication Test Set
(8960 or CMU 200).
Check the signal level at the
point U501 (C609 = 10uF/10V).
A few hundreds mV
of signal levels
are measured?
Check the connectivity
of R611 and R613.
Replace U603 or U604
which does not
have proper level.
END
NO
NO
5.2 MIC Trouble
Summary of Contents for BD38
Page 1: ...GSM PHONE SERVICE MANUAL MODEL BD38 1st version 2004 06 09 ...
Page 2: ...Rev 1 00 ...
Page 32: ...5 14 Troubleshooting ...
Page 35: ...6 PCB Diagram 6 1 Main PCB 6 1 Top View ...
Page 36: ...6 2 PCB Diagram Bottom View ...
Page 42: ...8 Exploded View and Parts List 8 1 Exploded View Main 8 1 1 Main 8 1 ...
Page 46: ...9 Block Diagram 9 1 BB Block Diagram 9 1 ...
Page 47: ...Block Diagram 9 2 RF Block Diagram 9 2 ...
Page 48: ...10 Schematic Diagram 10 1 Key Pad 10 1 ...
Page 49: ...10 2 Schematic Diagram 10 2 Main Board 10 2 1 Chipset ...
Page 50: ...10 3 Schematic Diagram 10 2 2 Memory Melody ...
Page 51: ...10 4 Schematic Diagram 10 2 3 Audio SIM ...
Page 52: ...10 5 Schematic Diagram 10 2 4 Connector ...
Page 53: ...10 6 Schematic Diagram 10 3 RF Top Schematic 10 3 1 RF PAM ...
