Sharp GX30 Service Manual - Page 74

GX30 CONFIDENTIAL 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? YES Is 2.8 V applied to UN101 pin 6? YES Does the send signal (UN101 pin 5) send pulse waves periodically? YES Is 3.0 V supplied from VCC (UN101 pin 1)? YES Is SD signal (UN101 pin 3) 0.2 V or lower? YES Does the RxD signal (UN101 pin 4) send pulse waves periodically? YES Is UN101 good in appearance and mounted properly? YES Is communication possible after replacing IrDA port (UN101)? YES IrDA port (UN101) is defective. Check in IrDA inspection mode. NO IC106 is defective. NO Q104 is defective or UN101 pin 6 is soldered improperly. R183 is defective. NO NO Is R183 good in appearance and mounted properly? YES IC106 is defective. R185 and C197 are defective. NO NO Are R185 and C197 good in appearance and mounted prop- erly? YES IC106 is defective. NO IC106 is defective. NO IrDA port (UN101) is defective. NO IrDA port (UN101) is defective or mounted improperly. NO IC106 is defective. 2 - 66