Key Pad Failure - Nokia 2228Arte Service Manual

RM-377
BB Troubleshooting and Manual Tuning Guide

Key pad Failure

a. Check D912 – D916 resistance by meter. (diode mode)
b. Check the resistance of key scan pin, each pin of matrix shall be 5M to 10M ohm
c. Check scan signal sequence, each pulse of row of scan is around 51uS.
Issue 1 COMPANY CONFIDENTIAL
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(the first : kypd_17, the last : kypd_9).
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