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Appendix D — CPC64/CPU64 Configuration

DO NOT attempt to adjust the power supply voltages. Damage caused by unauthorized volt-

age adjustment will not be covered by the warranty.

MANUAL VERSION 11.0 – May 2008

After waiting five seconds, observe the three LEDs on the front of the power supply

unit. All three LEDs +5V, -5V, and +24V) should be lit. If any of the LEDs are blinking

or are unlit, the power supply is defective and the entire unit must be replaced.

A blinking LED indicates

that an overly high voltage has

been detected. A lit LED merely

indicates that there is some volt-

age present (as shown in the table

at the right); it does not, however,

indicate whether the voltage level

is acceptable. To determine the

exact voltage level present, per-

form the following step.

Referring to

front of the power supply unit. A digital voltmeter of ±0.5% accuracy is required. Insert

the "common" voltmeter probe into the ground point and insert the other probe into the

desired voltage test point. The measurements should be within the limits listed in the

chart below.

If the voltages are within the specified limits, turn OFF the AC POWER switch and pro-

ceed to the next section.

If voltage measurements are not within the specified limits, replace the defective power

supply unit.

D-30, measure the following system voltages on the

<-1V & >-6.5V

Power Supply Electrical Test

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