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14. IrDA (Infrared) communication is impossible.
Set the distance and angle within the specification for the IrDA
communication.
Is 2.8 V supplied from Q104 pin 2?
Is 2.8 V applied to UN101 pin 6?
Does the send signal (UN101 pin 5) send pulse waves period-
ically?
Is 3.0 V supplied from VCC (UN101 pin 1)?
Is SD signal (UN101 pin 3) 0.2 V or lower?
Does the RxD signal (UN101 pin 4) send pulse waves periodi-
cally?
Is UN101 good in appearance and mounted properly?
Is communication possible after replacing IrDA port (UN101)?
IrDA port (UN101) is defective.
CONFIDENTIAL
YES
YES
YES
YES
YES
YES
YES
YES
Check in IrDA inspection mode.
NO
IC106 is defective.
NO
Q104 is defective or UN101 pin 6 is soldered improperly.
R183 is defective.
Is R183 good in appearance and mounted properly?
NO
IC101 or IC106 is defective.
Short terminal (CN101 pin 2 to VEXT) and C197 are defective.
Are short terminal (CN101 pin 2 to VEXT) and C197 good in
NO
appearance and mounted properly?
IC106 is defective.
NO
Q104 and IC106 are defective.
IrDA port (UN101) is defective.
NO
NO
IrDA port (UN101) is defective or mounted improperly.
NO
IC106 is defective.
2 – 57
GX15
NO
YES
NO
YES
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