User Guide

CCS Technical Documentation
NHM-4
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Grip switch troubleshooting
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Grip switch
faults
Cannot answer/end call
when open/close grip
Change
grip.
Now OK?
Measure
S300/pin 1
Is it 2.8VDC?
Retest
No
Use
Phoenix
ADC reading
Is ”Resistive
keyboard 1”
converter
~0V ?
Bring
magnet
close to S300
Is voltage now
~2.8VDC ?
Check R327, C319
If OK –>
replace S300
Check KEYB1 line,
S300 solders, R202
If OK –>
replace S300
Yes
Check that the
magnet is enough
near S300 when
the grip is closed
If OK –>
replace S300.
Yes
Yes
Yes
Yes
No
No
No