Agilent Technologies 35670-90066 manual Using a logic probe, check the following signals

Troubleshooting the Analyzer	Agilent 35670A
To perform initial verification

Step 7. Check signals required for power up.

G	• Using a logic probe, check the following signals.
	Signal Name	Test Location	TTL State	Probable Faulty Assembly
	PVALID	A7 P8 pin 3	High	A98 Power Supply
	RSTn	A7 P8 pin 5	High	A7 CPU
	CASn	A7 P7 pin 3	Toggling	A7 CPU
	RASn	A7 P7 pin 4	Toggling	A7 CPU
	VDATA	A7 P7 pin 7	Toggling	A7 CPU
	ASn	A7 P6 pin 10	Toggling	A7 CPU

•Using a logic probe, check that the following TTL signals are toggling just after power up.

The signals may stop toggling when the CPU assembly finishes the bootrom self tests.

Signal Name	Test Location
PASn	A7 P8 pin 7
PDSACK1n	A7 P8 pin 8
PDSACK0n	A7 P8 pin 9
PRW	A7 P8 pin 10
PDSn	A7 P8 pin 11
PA(26)	A7 P8 pin 12
PA(16)	A7 P8 pin 13

•If the signals are not correct, the A7 CPU assembly is probably faulty.

•Using a logic probe, check that A7 P7 pin 2 (SCL) and A7 P7 pin 1 (SDA) toggle TTL states at least twice just after power up.

•If the signals are not correct, the A7 CPU assembly is probably faulty.

•If the signals are correct, go to page 4-15,‘’To troubleshoot power-up failures.’’

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