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b. If the fuse is good, but you still have no AC input, verify that the wallpower supply outlet is
supplying sufcient power to the machine.
c. If correct power is being supplied to the machine, and the fuse is good, but the power input is
still too low or none, replace the power supply assembly.
d. If the power input is correct, and the green LED does not illuminate, replace the power supply
assembly. (This indicates that the power supply unit itself has failed.)
9. Use a voltage meter set to measure DC output and measure the voltage output on the upper ter-
minal block, measuring at the middle terminals as shown in Figure 1.
a. The black (common) electrode of the voltage meter goes on the ground (black wire) terminal,
and the red (positive or hot) electrode of the voltage meter goes on the positive (red wire)
terminal.
b. Measure the DC output voltages. The range should be between 34.5 to 38 DC volts. If the
voltages are not in this range, then replace the power supply assembly.
10. If the green LED on the side of the power supply unit is illuminated and the 36V DC output is be-
tween 34.5 to 38V DC then the power supply assembly is good. Follow the power supply installa-
tion procedures entitled “Power Supply Assembly” to install the Power Supply Assembly into the
machine.
11. If none of the above indicates a failure, the power supply assembly is good and can be installed
in the machine using the procedures for installing the power supply assembly in the section titled
“Power Supply Assembly”.
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