Sharp GX20 Service Manual - Page 62

No Service display and receiving/transmitting do not function in the DCS/PCS band.

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GX20 CONFIDENTIAL 10.2. "No Service" display and receiving/transmitting do not function in the DCS/PCS band. [Checkpoints for GSM tester transmission] Fixed line: During input of -70 dBm. After replacing the main PWB unit with normal one, trans- YES mission with GSM tester possible? NO NO After replacing FPC (flexible printed circuit) with normal YES one, transmission with GSM tester possible? [Checkpoints in RF Test Tool] [Transmitting System] Is transmission possible using RF Test Tool? YES NO Voltage applied to VCO971 7 pin? NO YES Is VCO971 frequency fixed at twice as the DCS (PCS)- NO band transmitting frequency + 80 MHz (or 82 MHz)? YES IQ Signal input to IC901 20, 21, 22, and 23 pins? NO YES Voltage applied to VCO851 11 pin? NO YES DCS (PCS)-Band Transmitting frequency input to IC831 8 NO pin? YES DCS (PCS)-Band Transmitting frequency input to FL801 1 NO pin? YES DCS (PCS)-Band Transmitting frequency input to J801 1 NO pin? YES J801 defective. [Receiving System] Fixed line: During input of -70 dBm. Voltage applied to VCO971 7 pin? NO YES Is VCO971 frequency fixed at twice as the DCS (PCS)- NO band receiving frequency? YES DCS (PCS)-Band Receiving frequency signal applied to YES IC901 7 and 8 (4 and 5) pins? NO DCS (PCS)-Band Receiving frequency signal output from YES FL801 5 (3) pin? NO DCS (PCS)-Band Receiving frequency signal input to YES FL801 9 pin? NO J801 or FL817 defective. 2 - 56 IC104, IC102, CN201, CN202, or PWB defective. FPC defective. IC202, IC303, Q304, or Q308 defective. IC901, VCO971, FL971, TCX951, or IC304 defective. IC104, IC102, or PWB defective. Q304 or Q309 defective. VCO851, IC901, or IC993 defective. FL811, R811, IC831, IC881, or IC992 defective. IC991, IC992, IC993, FL801 or FL817 defective. IC202, IC303, Q304, or Q308 defective. IC901, VCO971, FL971, TCX951, or IC304 defective. IC104, IC102, IC901, or PWB defective. FL901 (FL903) defective. IC991, IC992, IC993, or FL801 defective.

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GX20
2 – 56
CONFIDENTIAL
10.2. "No Service" display and receiving/transmitting do not function in the DCS/PCS band.
[Checkpoints for GSM tester transmission]
Fixed line: During input of –70 dBm.
After replacing the main PWB unit with normal one, trans-
mission with GSM tester possible?
IC104, IC102, CN201, CN202, or PWB defective.
After replacing FPC (flexible printed circuit) with normal
one, transmission with GSM tester possible?
FPC defective.
[Checkpoints in RF Test Tool]
[Transmitting System]
Is transmission possible using RF Test Tool?
Voltage applied to VCO971 7 pin?
IC202, IC303, Q304, or Q308 defective.
Is VCO971 frequency fixed at twice as the DCS (PCS)-
band transmitting frequency + 80 MHz (or 82 MHz)?
IC901, VCO971, FL971, TCX951, or IC304
defective.
IQ Signal input to IC901 20, 21, 22, and 23 pins?
IC104, IC102, or PWB defective.
Voltage applied to VCO851 11 pin?
Q304 or Q309 defective.
DCS (PCS)-Band Transmitting frequency input to IC831 8
pin?
VCO851, IC901, or IC993 defective.
DCS (PCS)-Band Transmitting frequency input to FL801 1
pin?
FL811, R811, IC831, IC881, or IC992 defective.
DCS (PCS)-Band Transmitting frequency input to J801 1
pin?
IC991, IC992, IC993, FL801 or FL817 defective.
J801 defective.
[Receiving System]
Fixed line: During input of –70 dBm.
Voltage applied to VCO971 7 pin?
IC202, IC303, Q304, or Q308 defective.
Is VCO971 frequency fixed at twice as the DCS (PCS)-
band receiving frequency?
IC901, VCO971, FL971, TCX951, or IC304 defective.
DCS (PCS)-Band Receiving frequency signal applied to
IC901 7 and 8 (4 and 5) pins?
IC104, IC102, IC901, or PWB defective.
DCS (PCS)-Band Receiving frequency signal output from
FL801 5 (3) pin?
FL901 (FL903) defective.
DCS (PCS)-Band Receiving frequency signal input to
FL801 9 pin?
IC991, IC992, IC993, or FL801 defective.
J801 or FL817 defective.
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
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YES
YES
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YES
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YES
NO