J307 Voltage Measurements

Troubleshooting - 3

J307 connects the A1 Main Board Assembly to the A2 Interface Assembly. Table 3-4 provides a quick method of determining if the voltages between these assemblies are within the normal range. If any of these voltages is outside the normal range, refer to the flowcharts to further troubleshoot the circuit associated with the abnormal voltage.

Table 3-4. Voltage Measurements at J307 (A2 Interface to A1 Main board)

A1J307	Signal Name	CV Mode	CC Mode
Pin #		Full Scale Voltage	Full Scale Voltage
		No Load	Full Load
1	PM_INHIBIT (Enabled)	0	0
2	OV_SCR*	+5	+5
3	OV_PROG	+3.9	+3.9
4	FAN_PROG	+2.8	+3.8
5	OV_DETECT*	+5	+5
6	SW_POS (Norm)	+5	+5
7	RANGE_SELECT (High)	0	0
8	OS_TRIM_NEG (COMP)	+1.7	+1.7
	OS_TRIM_NEG (SCPI)	+4.0	+4.0
9	+5Vs	+5	+5
10	COMMON	0	0
11	COMMON	0	0
12	+15Vs	+15	+15
13	-15Vs	-15	-15
14	HS_THERM (@25C)	+2.5	+2.5
15	FUSE	+2.4	+2.6
16	IMON_H	0	+3.5
17	IMON_L	0	+14.7
	IMON_L (@20mA Out)	+4.8	+4.8
18	IMON_P	0	0
19	VMON	+4.8	+4.8
20	COMMON	0	0
21	COMMON	0	0
22	COMMON	0	0
23	COMMON	0	0
24	CV_PROG	-4.8	-4.8
25	CC_PROG	-4.8	-4.8
26	CC_DETECT*	+5	0
27	CCN_DETECT*	+5	+5
28	CV_DETECT*	0	+5

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