Automatic Fault Isolation References (1 Of 2) - HP 8560A Service Manual

Table 10-4. Automatic Fault isolation References (1 of 2)
Suspected Circuit Indicated
by Automatic Fault Isolation
Check the YTO Loop
Check 1st LO
Check 1st LO Pretune Frequency and Amplitude
Check 3rd LO Drive
Check 10 MHz Reference to Phase Frequency
Detector
Check for 10 MHz Signal at Other Input to
Phase/Frequency Detector
Check A3 ADC MUX function block
Check Al4 Frequency Control Assembly
Check Level at Amplifier Input
Check Levels into Mixer U400
Check Loop References
Check Main Coil Tune DAC
Check Main Coil Coarse and Fine DACs
Check Main Roller Mixer
Check Main Roller Oscillator and Output Buffer
Manual Procedure to Perform
Confirming a Faulty Synthesizer Section
(steps 9-11)
(steps 10-13)
Unlocked YTO PLL
Third LO Driver amplifier
(steps 8-13)
Unlocked Reference PLL
(steps 12 and 13)
Unlocked Reference PLL
Confirming a Faulty Synthesizer Section
Confirming a Faulty Synthesizer Section
(steps 12-l 7)
Confirming a Faulty Synthesizer Section
(steps 5-8)
Confirming a Faulty Synthesizer Section
(steps 18-25)
First LO Span Problems (All Spans)
(steps 28-34)
Unlocked YTO PLL
(steps 10-23)
YTF Driver Circuit
Third LO Driver Amplifier
(steps 3-13)
Unlocked Offset PLL
(steps 1 and 2)
Unlocked Offset PLL
(steps 45-49)
Unlocked YTO PLL
(steps
Unlocked YTO PLL
(steps 10-15)
Main Oscillator PLL
(steps
Main Oscillator PLL
(steps 16-22)
Main Oscillator PLL
(steps 5-9)
Main Oscillator PLL
First LO Span Problems 21 MHz
(steps 1-3)
Offset Oscillator PLL
Synthesizer Section 10-9
(steps l-6)
(steps l-4j
(steps l4-21)
(steps l-6)
41-44)
l-4)
(step 9)