NHL-4/4U Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Start
Is earpiece working?
Try to change earpiece.
Is it working now?
Retest earpiece
Set phone in LOCAL mode. Use Phoenix audio test.
Set EXT IN, HP OUT, LOOP ON
Measure DC offset
voltage from earpiece
pads. Is it ~1.38V?
No
No
Yes
Measure MIC2B voltage
from XMICP (L102).
Is it ~2.2V?
Yes
Measure sine signal from
earpiece pads.
Is it~880mVp-p?
Continue
Check L102, C116, R150, C159, R153,
C150 and line. If OK, change UEM.
No
Check L150, C155, R151, R152 and
lines. If OK, change UEM.
No
Measure sine signal
from R155 (UEM).
Is it ~130mVp-p?
No
Change UPP and retest
Yes
Yes
Connect EXT audio signal (1kHz sine,
200mVpp) in XMICP and GND in XMICN.
Yes
Change
UEM
Yes
Check C154, R155,
C156, R154 and lines
No
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