User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 67
Issue 1 06/01
2.19.2 Mic faulty
MIC
faulty
Data
Check voltages :
V202 pin 1 : 1.8V
Voltages
NO
OK
OK
NO
Voltages OK?
Check analog audio signal at
Signal a few mV ?
NO
NO
OK
OK?
V202 pin 3: 0.17V
during a call
OK?
Mbias at R222
2.1V during call?
DC voltage at C234 and C235
1.4V during call ?
C232 during a call
*
*
*
Check R222, R218
C231, C224,
C230
Check
C234, C235
Fault in
N200 (COBBA)
NO
Check
C234, C235
Check
C225, C240, R219,
R220 and PWB traces
Check microphone and mic connections to PWB
Check digital PCM data atJ308 (PCMRxData)
during a call
Faulty N200 (COBBA)
Refer to
COBBA control
interface troubleshooting
OK
OK
Figure 55.
Note:* can not be measured in the service jig, because components are under
the SIM connector.
Use wire to measure them. After removing measurement wire, check that com-
ponents are not defected. It is recommended to replace the components.