526 Chapter11
Synthesizer Section
Test Connector Locations
YTO loop phase/frequency detector Unlocked YTO PLL (steps 27-34)
YTF gain and offset DACs YTF Driver Circuit (steps 10-23)
Level at amplifier input Third LO Driver Amplifier (steps 1-6)
Levels into mixer A15U400 Unlocked YTO PLL (steps 3-13)
Offset PLL Unlocked YTO PLL (steps 1 and 2)
Main coil tune DAC Unlocked YTO PLL (steps 45-49)
Main coil coarse and fine DACs Unlocked YTO PLL (steps 41-44)
Sweeping fractional N Fractional N Span Problems (LO Spans £2
MHz)
Reference PLL phase/frequency detector Unlocked Reference PLL (steps 17-22)
Path to offset PLL phase/frequency
detector
Unlocked YTO PLL (steps 3-7, 14-19)
Sampler drive output of A7 Unlocked YTO PLL (steps 18-21)
Sampler IF Unlocked YTO PLL (steps 22-26)
Sampler/sampler IF operation Sampler and Sampler IF (steps 1-15)
Span attenuator 1st LO Span Problems (All Spans) (steps
6-13)
Sweep generator Sweep Generator Circuit
Sweep + tune multiplier YTF Driver Circuit (steps 4-9)
600 MHz reference loop amplifier Unlocked Reference PLL (steps 23-26)
YTO loop Unlocked YTO PLL
YTO FM coil driver 1st LO Span Problems (2.01 MHz to 20
MHz) (step 6)
YTO FM coil driver and main loop error
voltage driver
Unlocked YTO PLL (steps 35-40)
Table 11-1 Troubleshooting Suspected Faulty Circuits
Suspected Circuit Procedure to Perform
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