Nokia RM-484 Service Manual page 83

RM-484; RM-485; RM-486
BB Troubleshooting
Troubleshooting flow
ITU keyboard backlights are controlled by the Ambient Light Sensor. They are supposed to be illuminated
only in dark ambient light. At first, cover the ALS and check if they are OK. If they are not, go to the
troubleshooting diagram below.
Issue 1 COMPANY CONFIDENTIAL Page 3 –37
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