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Level 3 Repair
8-27
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8-3-10. Key Data Input
Check Initial Operation
Yes
Check the 3×4 key
domesheet
(adhesion condition,
foreign substances)
Change the 3×4 key
domesheet
or adhere correctly to
PBA.
3×4 Key
Check the key
circuit.
(not connected, not
soldered, short)
resolder R332, R333,
R338, R339, ZD302,
D302
No
Yes
END
No
Is it the 3×4
key or the SUB
key?
SUB key
Change the SUB key
domesheet
or adhere correctly to
SUB PBA.
Check the SUB
key domesheet
(adhesion
condition, foreign
substances)
No
Yes
Yes
Check the SUB PBA
(is broken?)
Yes
END
Check the
connection
condition. (not
connected slide
FPCB)
Reconnect slide
FPCB
No
Yes
Summary of Contents for GT-C3750
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