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
Signal Name
Pin #
1
PM_INHIBIT (Enabled)
2
OV_SCR*
3
OV_PROG
4
FAN_PROG
5
OV_DETECT*
6
SW_POS (Norm)
7
RANGE_SELECT (High)
8
OS_TRIM_NEG (COMP)
OS_TRIM_NEG (SCPI)
9
+5Vs
10
COMMON
11
COMMON
12
+15Vs
13
-15Vs
14
HS_THERM (@25C)
15
FUSE
16
IMON_H
17
IMON_L
IMON_L (@20mA Out)
18
IMON_P
19
VMON
20
COMMON
21
COMMON
22
COMMON
23
COMMON
24
CV_PROG
25
CC_PROG
26
CC_DETECT*
27
CCN_DETECT*
28
CV_DETECT*
CV Mode
Full Scale Voltage
No Load
0
+5
+3.9
+2.8
+5
+5
0
+1.7
+4.0
+5
0
0
+15
-15
+2.5
+2.4
0
0
+4.8
0
+4.8
0
0
0
0
-4.8
-4.8
+5
+5
0
Troubleshooting - 3
CC Mode
Full Scale Voltage
Full Load
0
+5
+3.9
+3.8
+5
+5
0
+1.7
+4.0
+5
0
0
+15
-15
+2.5
+2.6
+3.5
+14.7
+4.8
0
+4.8
0
0
0
0
-4.8
-4.8
0
+5
+5
39