Moderately Low Sensitivity; Front-End Tuning Voltages And Corresponding Dac Values - Tait TM9100 Service Manual

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Following the initial investigation in

Moderately Low

when the sensitivity loss is moderate.

Table 10.2 Front-end tuning voltages and corresponding DAC values

Frequency band

Frequency (MHz)

Frequency (MHz)

Frequency (MHz)

TM9100 Service Manual

can and, if not already done, the

Check the soldering of all the components of the front-end tuning

circuitry from C400 to T401 (see

Check the 3V supply voltage at L404; use the measurement point

Also check the LNA bias conditions. First measure V

collector of Q401 and ground (see

: 2.7 ± 0.1V

Secondly, check I

. To do so, unsolder and raise one terminal of L404

(tombstone position) (see

between this terminal and the pad for the terminal, and measure the

If the checks in

is a fault, repair it and go to

Check the signal level at the output of LO1 and continue the fault

diagnosis as in

"Power Supply for FCL" on page

Recalibrate the receiver using the calibration application.

Confirm the removal of the fault and go to

147. If the repair failed, go to

Tuning voltages at five different frequencies

7, check the circuitry as follows

10.3), connect a multimeter

reveal no fault, go to

"Final Tasks" on

Receiver Fault Finding