Troubleshooting - 3
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J307 Voltage Measurements
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
Pin #
Signal Name CV Mode
Full Scale Voltage
No Load
CC Mode
Full Scale Voltage
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
IMON_L (@20mA Out)
0
+4.8
+14.7
+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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