Key Data Input - Samsung GT-C3750 Service Manual

8-3-10. Key Data Input

Check Initial Operation
Yes
Is it the 3×4
key or the SUB
key?
3×4 Key
Check the 3×4 key
domesheet
(adhesion condition,
foreign substances)
Yes
Check the key
circuit.
(not connected, not
soldered, short)
Yes
END
SUB key
Change the 3×4 key
No
domesheet
or adhere correctly to
No
resolder R332, R333,
R338, R339, ZD302,
D302
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Check the SUB
key domesheet
(adhesion
condition, foreign
substances)
Yes
PBA.
Check the
connection
condition. (not
connected slide
FPCB)
Check the SUB PBA
(is broken?)
END
8-27
Level 3 Repair
No
Change the SUB key
domesheet
or adhere correctly to
SUB PBA.
No
Reconnect slide
FPCB
Yes
Yes