Page D-32
Appendix D — CPC64/CPU64 Configuration
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Power Supply Electrical Test
4. 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.
NOTE: 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.
5. Referring to Figure D-5 on page D-30, measure the following system voltages on the
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.
6. If the voltages are within the specified limits, turn OFF the AC POWER switch and pro-
ceed to the next section.
7. If voltage measurements are not within the specified limits, replace the defective power
supply unit.
Voltage Tolerance
-5VDC
+5VDC
+24VDC
+
5%
+
5%
+5%
CAUTION
DO NOT attempt to adjust the power supply voltages. Damage caused by unauthorized volt-
age adjustment will not be covered by the warranty.
Voltage LED Output
+5VDC
OFF
ON
BLINKING
1V
>1V & <6.5V
6.5V
-5VDC
OFF
ON
BLINKING
-1V
<-1V & >-6.5V
-6.5V
+24VDC
OFF
ON
BLINKING
1V
>1V & <29V
29V
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