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NHM–7
Troubleshooting Instructions
PAMS Technical Documentation
Page 19
Issue 1 10/2001
Nokia Corporation
Display
faults 2
Are the display
led’s turned on ?
Measure signal
fromV301 pin. 3.
Is it 128 Hz
~3.3Vp–p ?
Check LED‘s
and line
Measure VBATT
from V301 pin. 4
It is OK?
Check R307
and VBATT
line
Measure
PWM LED‘s
control signal from UEM
Is it 128 Hz
~3.8Vp–p ?
Check control
signal line.
If OK,
Change UEM
Check R305,
V301, V329
and line
No
Yes
No
No
Yes
No
Yes
Display
faults 3
Yes
Summary of Contents for NHM-7 series
Page 212: ......