Current Gauge - Nokia NHL-2NA Series Troubleshooting Instructions

CCS Technical Documentation

Current Gauge

There are basically three kinds of problems that may occur concerning the current gauge:
(1) the PWM signal is out of the specification, (2) it does not give a PWM signal at all or
(3) the gauge does not react its shut down signal. The user notices a current gauge prob-
lem when the phone never stops charging.
Check
yes no
Connectors that
their contacts,
OK?
no
Repair connectors
and change if
necessary.
yes
Change N001 to
a new one and retest,
Problem solved
yes
Issue 1 07/02
Check that N001 Is
properly soldered and all
no
necessary components are
on their places.
OK?
yes
Measure from J001
that it has Vbat voltage,
OK?
yes
Measure that J008
yes
gives 20 Hz PWM signal
when J007 is pulled up to
Vbat. And is ~Vbat when
pulled down,
OK?
no
Change
no Grip-module
Did it solve the
OK? problem?
yes
¤Nokia Corporation
Assemble missing or broken
components and retest
Go to LG4
troubleshooting
yes
Check
Connectors that their no
contacts are ok.
OK?
Check connectors
no
no and flex cable,
change if needed.
Did it solve the
problem?
yes
NHL-2NA
Repair connectors
and change if
necessary.
Check EMI-filter
no
Z384 and UEM
D190, change if
needed?
Did it solve the
problem?
Beyond of
economical
yes
repair
Page 3