Nokia 6310I - Cell Phone - GSM, Service Manual

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PAMS Technical Documentation 6 - Troubleshooting
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Earpiece doesn’t work
and there isn’t any
mechanical problem
Check L158, R171 (and
C150 and R156 for
Shortcircuit)
UEM FAILURE (D200)
Ok
Microphone doesn’t work
and there isn’t any
mechanical problem
R151 towards miclines (bias) = 1.0-
1.4 V
Check R150, R151,
V158, C151, C153,
C152
Check MIC line to UEM:
L155, R153,C156, C155, R151,
C154, R152
UEM FAILURE (D200)
Yes
No
Ok
Audio faults
Headset microphone doesn’t work
and there isn’t any
mechanical problem
Check XMIC line to UEM:
L168, R167, C168, C167, C166,
C165, R166, C164, R165
UEM FAILURE (D200)
Yes
Ok
Replace Earpiece
Ok
Replace Microphone
Ok
R150 towards UEM (bias) = 2.1V UEM FAILURE (D200)
No
Yes
Ok
R163 towards miclines (bias) = 0.8-
1.4 V
Check R162, R163,
V151, C160, C162,
C161
No
Ok
R162 towards UEM (bias) = 2.1V UEM FAILURE (D200)
No
Yes
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Check R171 (and