
4-64 Fault Isolation
2. Plug in the power cord and power on the system. Do not unplug the J004 connector
from the CPU board. Measure the voltages through the top of the connector. Use
the voltmeter to test for the voltages on the J004 connector as listed in Table 4-17.
Table 4-17. Model 400t and 400dl Power Supply
Voltages and Tolerances
Voltage
(V dc)
Tolerance at
J004 Connector
J004 Connector
Pin No.
Wire
Color
+ 5
Ground
+ 12
-12
+ 12
+ 9
4.85 to 5.25 V dc
—
11.4 to 12.6 V dc
-11.28 to -12.72 V dc
11.4 to 12.6 V dc
8.7 to 9.3
1, 3, and 9
14, 16, 18, and 20
7
6
4
Differential between
Pins 17 and 19
Red
Black
Violet
Green
Brown
Orange
Yellow
Voltage
(V dc)
Tolerance at
P2 and P3 Connector
P2 and P3
Connector Pin No.
Wire
Color
+ 5
+ 12
Ground
4.85 to 5.25 V dc
11.4 to 12.6 V dc
—
4
1
2 and 3
Red
Violet
Black
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