HP 8560A

Table 10-4. Automatic Fault Isolation References (2 of 2)
Suspected Circuit Indicated
by Automatic Fault Isolation
Check Offset Oscillator PLL
Check Offset Oscillator PLL Pre-Scaler
Check Offset Oscillator Pretune Circuitry
Check Offset Span Accuracy
Check Offset Oscillator Sweep/Hold
Check Phase/Frequency Detector
Check Path to Phase/Frequency Detector
Check Roller Oscillator
Check Sampler Drive Output of A7 LODA
Check Sampler IF
Check Sampler/Sampler IF Operation
Check Span Attenuator
Check Sweep Generator
Check Sweep + Tune Multiplier
Check the 600 MHz Reference Loop Amplifier
Check the YTO Loop
Check Transfer Oscillator
Check Transfer Oscillator PLL
Check Transfer Oscillator Pre-Scaler
Check Transfer Oscillator Pretune DAC
Check YTF Gain and Offset DACs
Check YTO FM Coil Driver
Check YTO FM Coil Driver and Main
Loop Error
Voltage Driver
Manual Procedure to Perform
Offset Oscillator PLL (steps 14-18)
Offset Oscillator PLL (steps 9-13)
Offset Oscillator PLL (steps 4-8)
First LO Span Problems 51 MHz (step 8)
Offset Oscillator PLL (steps 20-23)
Unlocked Reference PLL (steps 17-25’1
Unlocked Offset PLL (steps 3-7, 14-19)
Unlocked YTO PLL (steps 14-18)
Unlocked YTO PLL (steps 19-22)
Unlocked YTO PLL (steps 23-27)
Sampler and Sampler IF (steps l-15)
First LO Span Problems (All Spans) (steps 6-13)
Sweep Generator Circuit
YTF Driver Circuit (steps 4-9)
Unlocked Reference PLL (steps 23-26)
Unlocked YTO PLL
Transfer Oscillator PLL (steps 1 and 2)
Transfer Oscillator PLL (steps 15-16)
Transfer Oscillator PLL (steps 11-14)
Transfer Oscillator PLL (steps 11-14)
Transfer Oscillator PLL (steps l-10)
First LO Span Problems (1 MHz to 20 MHz)
(Step 6)
Unlocked YTO PLL (steps 35-40)
lo-10 Synthesizer Section