Sharp GX10i Service Manual page 54

GX10i
9. 2 "No Service" display and receiving/transmitting do not function in the DCS (PCS) band.
[Receiving System]
Does the signal strength indicator show 4 bars?
YES
* Fixed line: During input of –70 dBm.
After replacing the main PWB unit with a normal one,
receiving available?
After replacing FPC (flexible printed circuit) with a
normal one, receiving available?
Voltage applied to VCO971 7 pin?
Is VCO971 frequency fixed at twice as the DCS
(PCS) band receiving frequency?
DCS (PCS)-Band Receiving frequency signal applied
to IC901 7 and 8 (4 and 5) pins?
DCS (PCS)-Band Receiving frequency signal output
from FL801 5 (3) pin?
DCS (PCS)-Band Receiving frequency signal input
to FL801 9 pin?
J801 defective.
[Transmitting System]
Voltage applied to VCO971 7 pin?
Is VCO971 frequency fixed at twice as the DCS (PCS)-
band transmitting frequency + 80 MHz (or 82 MHz)?
IQ Signal input to IC901 20, 21, 22, and 23 pins?
Voltage applied to VCO851 11 pin?
DCS (PCS)-Band Transmitting frequency input to
IC831 8 pin?
DCS (PCS)-Band Transmitting frequency input to
FL801 1 pin?
DCS (PCS)-Band Transmitting frequency input to
J801 1 pin?
J801 defective.
CONFIDENTIAL
NO
NO
NO
YES
YES
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
2 – 50
YES
IC104, IC105, CN201, CN202, or PWB defective.
YES
FPC defective.
NO
IC202, IC303, Q304, or Q308 defective.
NO
IC901, VCO971, FL971, TCX951, or IC304 defective.
YES
IC104, IC102, IC901, or PWB defective.
YES
FL902 (FL903) defective.
YES
IC991, IC992, IC993, or FL801 defective.
NO
IC202, IC303, Q304, or Q308 defective.
NO
IC901, VCO971, FL971, TCX951, or IC304 defective.
NO
IC104, IC102, or PWB defective.
NO
Q304 or Q309 defective.
NO
VCO851, IC901, IC991, IC992, or IC993 defective.
NO
FL816, R816, IC881, or IC831 defective.
NO
FL801 defective.