516 Chapter10
Synthesizer Section
Troubleshooting Using the TAM
Figure 10-4 TAM Connector Pin Locations
Table 10-3 Measured Signal Line Location
Measured Signal Line Connector Pin
MSL1 pin 1
MSL2 pin 2
MSL3 pin 3
MSL4 pin 4
MSL5 pin 5
GND pin 6
MSL6 pin 13
MSL7 pin 14
MSL8 pin 15
Table 10-4 Automatic Fault Isolation References
Suspected Circuit Indicated by Automatic
Fault Isolation
Manual Procedure to Perform
Check the YTO loop
Check first LO Confirming a Faulty Synthesizer Section
(steps 9-11)
Check first LO pretune frequency and amplitude Unlocked YTO PLL (steps 10-13)
Check 3rd LO drive Third LO Driver Amplifier (steps 1-6)
Check 10 MHz reference to phase/frequency Unlocked Reference PLL (steps 8-13)
detector
Check for 10 MHz signal at other input to Unlocked Reference PLL (steps 12 and 13)
phase/frequency detector
Check A3 ADC MUX function block Confirming aFaulty SynthesizerSection (steps
1-4)
Check A14 frequency control assembly Confirming a Faulty Synthesizer Section
(steps 12-17)
Check A14J301 10 MHz REF input Confirming a Faulty Synthesizer Section
(steps 5-8)
Check A15 RF assembly Confirming a Faulty Synthesizer Section
(steps 18-25)