Problems From The User Point Of View - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

Problems from the user point of view

"The sensor doesn't control backlights of the phone"
"The light sensor never
controls backlights of
the phone." "Backlight
always on."
No
s light
I
sensor set
on?
Yes
No
Are
backlights
off in bright
light? (1)
Yes
ALD circuitry is working
Page 34
Figure 11:
ALD troubleshooting 1
Set the sensor to
"Maximum".
Does sensor
Use Phoenix to see
reading
ADC-readings and
change with
VCXOTEMP. Read the
illumination?
sensor in bright light.
(2)
Is
VCXOtemp
readind
around the
right value?
Are ADC-
readings
OK?
Reassemble the
phone
Is ALD
mechanics
OK?
(5)
Calibrate the light
sensor
¤Nokia Corporation
CCS Technical Documentation
No
Disassemble the
phone to MJS-9Q
Yes
No
Disassemble the
phone to MJS-9Q
Yes
No
Replace UEM
Yes
No
Replace A-cover
Yes
Check pull-up resistor
and phototransistor (3)
Check pull-up resistor
and NTC resistor (4)
If this does not help, the
problem is beond economical
repair.
Issue 1 07/02