Agilent Technologies 856290216 service manual Synthesizer l-5

Table 11-2. Automatic Fault Isolation References (continued)

	Suspected Circuit Indicated		Manual Procedure to Perform
	by Automatic Fault Isolation
Check	offset	span accuracy	First LO Span Problems 52 MHz (step 8)
Check	phase/frequency detector		Unlocked Reference PLL (steps 17-22)
Check path to phase/frequency detector			Unlocked Offset PLL (steps 3-7,14-f9)
Check sampler drive output of A7			Unlocked YTO PLL (steps 18-21)
Check	sampler IF		Unlocked YTO PLL (steps 22-26)
Check	sampler/sampler IF operation		Sampler and Sampler IF (steps l-15)
Check	span	attenuator	First LO Span Problems (All Spans) (steps 6-13)
Check	sweep	generator	Sweep Generator Circuit
Check sweep + tune multiplier			YTF Driver Circuit (steps 4-9)
Check the 600 MHz reference loop amplifier			Unlocked Reference PLL (steps 23-26)
Check the YTO loop			Unlocked YTO PLL
Check YTO FM coil driver			First LO Span Problems (2.01 MHz to 20 MHz)
			(Step 6)
Check YTO FM coil driver and main loop			Unlocked YTO PLL (steps 3540)
error voltage		driver

Synthesizer Section 1l-5