Ihf - Nokia NHL-10 Baseband Troubleshooting And Manual Tuning Manual

NHL-10
Baseband Troubleshooting

IHF

START
Check IHF speaker contacts and
PWB pads. Are they OK?
Yes
Set Phone Audio Routing from a
know n w orking MIC input, MIC1
[HP, int] or MIC2 [Ext, XMIC] to
HF/HFCM. Ensure the correct
MIC Bias is ON.
I s the DC Bias voltage
s een on the IHF
di fferential paths at the
I HF speaker pads?
Yes
See the following flow chart
ISSUE 2 01/2004
Figure 24: IHF troubleshooting
No
Clean contacts / replace
the IHF speaker (B340) &
gasket.
No
Is VBATHF present?
Yes
Is the Boomer enable
line high (check at
J330)?
Yes
Is the HF/HFCM DC Bias
seen on the input path
to Boomer at C338 &
C337?
Yes
Check audio path from Boomer
(N330) to the IHF pads through
L359 & L360. Check for shorts /
low impedance to GND or
betw een the lines. Also check
passives around Boomer,
especially R336 to R338. Change
passives w here necessary.
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
CCS Technical Documentation
Audio Troubleshooting
No
Check R362 & R363 for
low impedance.
Change UPP_
No
WD2
Follow the trouble-
No
shooting flow chart for
External earpiece faults.
Is the DC Bias voltage
seen on the IHF
differential paths at the
IHF speaker pads?
Yes
IHF
No
Change Boomer
(N330)
31