
TP9100 Service Manual
Receiver Fault Finding
255
© Tait Electronics Limited
May 2005
Task 3 —
Check Logic Signal
If there is no fault with the power supplies, check the logic signal
DIG RX EN
that is input from the digital circuitry.
1.
Check the logic signal
DIG
RX
EN
at pin 8 of
IC403
(see
The signal is active high. The required status is active.
An alternative measurement point to the above is pin 24 of
IC400
under the
IF IQ BOT
can (see
2.
If
DIG
RX
EN
. If it is not, go to
.
3.
Check the signal continuity from the digital board to the receiver.
Repair any fault and go to
. If the digital board itself appears to
be faulty, replace the main board and go to
4.
Recalibrate the receiver using the calibration application.
5.
Confirm the removal of the fault and go to
. If the repair failed, go to
Task 4 —
Check Lock Status
If the logic signal from the digital board is active, as required, check the lock
status of the radio.
1.
Enter the CCTM command
72
to determine the lock status.
The status should be normal:
2.
If the lock status is normal, go to
. If the LO1 is not in lock, go
“Frequency Synthesizer Fault Finding” on page 159
. If the FCL is
not in lock, go to
“Power Supply for FCL” on page 205
. If the LO2
is not in lock, go to
3.
Check the components around
IC403
,
Q402
and
Q403
(see
). Repair any fault.
4.
Recalibrate the receiver using the calibration application.
5.
Confirm the removal of the fault and go to
. If the repair failed, go to
pin 8 of IC403: about 3.0V (active)
lock status: 111 (LO1, FCL, LO2 all in lock)
Содержание TP9100
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Страница 74: ...74 Circuit Descriptions TP9100 Service Manual Tait Electronics Limited May 2005 ...
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