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