Chapter 11 585
RF Section
Troubleshooting Using the TAM
Check A7 1st LO Distribution Amplifier A7 LODA (LO Distribution Amplifier)
Check A8 Low Band Mixer A8 Low Band Mixer
Check A9 Input Attenuator A9 Input Attenuator
Check A13 Second Converter A13 Second Converter
Check A13J2 INT 2nd IF A13 Second Converter (steps 1 to 6)
Check A15 Control Latches Control Latches
Check A15J601 10.7 MHz Third Converter Output
Check External 10 MHz Reference
Operation
10 MHz Reference (steps 5 to 11)
Check Gain of Flatness Compensation
Amplifier
Third Converter
Check INT 10 MHz Reference Operation 10 MHz Reference (steps 1 to 4)
Check LO Feedthrough Low Band Problems (1 kHz to 2.9
GHz) (steps 1 to 3)
Check LO Power Low Band Problems (steps 4 to 9)
Check PIN Switch PIN Switch
Check PIN Switches in SIG ID Oscillator SIG ID Oscillator
Check Second Converter Control A13 Second Converter
Check SIG ID Oscillator Signal ID Oscillator Adjustment in
Chapter 2
Check SIG ID Oscillator Operation SIG ID Oscillator
Check Third Converter Low Band Problems (step 10)
Table 11-2 TAM Tests versus Test Connectors
Connector Manual Probe Troubleshooting Test Measured
Signal
Lines
A14J17 Main Coil Course DAC MS3
A14J18 LODA Drive MS5, MS6,
MS7, MS8
A14J19 Second Conv PIN Switch MS8
Second Conv Mixer Bias MS1
Table 11-1 Automatic Fault Isolation References
Suspected Circuit Indicated by
Automatic Fault Isolation
Manual Procedure to Perform
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