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