Irda (Infrared) Communication Is Not Possible - Sharp TQ-GX30E Service Manual

GX30

18. IrDA (Infrared) communication is not possible.

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.
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CONFIDENTIAL
YES
YES
YES
YES
YES
YES
YES
YES
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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
IC106 is defective.
R185 and C197 are defective.
Are R185 and C197 good in appearance and mounted prop-
NO
erly?
IC106 is defective.
NO
IC106 is defective.
IrDA port (UN101) is defective.
NO
NO
IrDA port (UN101) is defective or mounted improperly.
NO
IC106 is defective.
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NO
YES
NO
YES