Agilent Technologies 6684A, 6680A, 6683A, 6681A, 6682A AC Input Board, DC Rail Board, Bias Board

Table 6-3. Test Points

TEST POINT No. & Loc.				Signal Tested				Measurement and Conditions
					A2 GPIB BOARD
	J106-4		Primary/chassis ground					Connect meter or scope common here. Then
								make measurements at test points
								through	.
	U101- 1		+ 5V primary bias					+ 5V + 0.2V
	U101-6		PCLR					Goes high for approximately 40 ms at power on,
			PCLR*					then goes low.
	U101-8							Held low for approximately 40 ms at power on,
			STX					then goes high.
	U110-3							Primary transmit to secondary serial data line.
			SRX					Toggles between 0 and +5V.
	U111-6							Primary receive from secondary serial data line.
			FPRX					Toggles between 0 and +5V.
	U119-4							Primary receive from front panel serial data
			FPTX					line. Toggles between 0 and +5V.
	U119-18							Primary transmit to front panel serial data line.
								Toggles between 0 and +5V.
					AC Input Board
Connect meter between TP		and		, or	and	, or	and	, and measure approximately 220VAC or
			440VAC. Measurements at test points Rthrough X.
	J418-1/J417-7		AC Mains Voltage
			AC Mains Voltage
	J418-2/J417-8
	J418-3/J417-9		AC Mains Voltage
	K402 coil		24VDC Coil Voltage					Turns on PS, and after power-on initialization
								test, reads approximately 24VDC.
					DC Rail Board
	J430-1 (+) to J430-2 (-)		Rail #1 Voltage					Measure approximately 290VDC
	J431-1 (+) to J431-2 (-)		Rail #2 Voltage					Measure approximately 290VDC
					Bias Board
	J801-4 to J801-5		GPIB 5V Bias					+15 ± 0.9V measure approx. 11VAC
	J801-1 (+) to J801-2 (-)		Fan voltage					Measure 24VDC
	J827-1 (+) to J827-2 (-)		Inrush relay coil					Measure 24VDC
	J827-1 (+) to J827-3 (-)		Rail relay coil					Measure 24VDC after power-on initialization
								test.
	R331		24V Primary					Measure approximately 34VAC
	R330		-15Vs secondary bias					-15 ± 0.9V
	+C354		-25V					-22.5V to -27.5V
	U310-16		RELAY ON*					0V
	U308-6		RESET					0V
	U308-7		BIAS OK					+5V

Diagrams 117